initial commit

1 files changed, 3117 insertions, 0 deletions

diff --git a/vendor/golang.org/x/sys/unix/syscall_zos_s390x.go b/vendor/golang.org/x/sys/unix/syscall_zos_s390x.go
new file mode 100644
index 0000000..312ae6a
--- /dev/null
+++ b/vendor/golang.org/x/sys/unix/syscall_zos_s390x.go
@@ -0,0 +1,3117 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build zos && s390x
+
+// Many of the following syscalls are not available on all versions of z/OS.
+// Some missing calls have legacy implementations/simulations but others
+// will be missing completely. To achieve consistent failing behaviour on
+// legacy systems, we first test the function pointer via a safeloading
+// mechanism to see if the function exists on a given system. Then execution
+// is branched to either continue the function call, or return an error.
+
+package unix
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"reflect"
+	"regexp"
+	"runtime"
+	"sort"
+	"strings"
+	"sync"
+	"syscall"
+	"unsafe"
+)
+
+//go:noescape
+func initZosLibVec()
+
+//go:noescape
+func GetZosLibVec() uintptr
+
+func init() {
+	initZosLibVec()
+	r0, _, _ := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS_____GETENV_A<<4, uintptr(unsafe.Pointer(&([]byte("__ZOS_XSYSTRACE\x00"))[0])))
+	if r0 != 0 {
+		n, _, _ := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS___ATOI_A<<4, r0)
+		ZosTraceLevel = int(n)
+		r0, _, _ := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS_____GETENV_A<<4, uintptr(unsafe.Pointer(&([]byte("__ZOS_XSYSTRACEFD\x00"))[0])))
+		if r0 != 0 {
+			fd, _, _ := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS___ATOI_A<<4, r0)
+			f := os.NewFile(fd, "zostracefile")
+			if f != nil {
+				ZosTracefile = f
+			}
+		}
+
+	}
+}
+
+//go:noescape
+func CallLeFuncWithErr(funcdesc uintptr, parms ...uintptr) (ret, errno2 uintptr, err Errno)
+
+//go:noescape
+func CallLeFuncWithPtrReturn(funcdesc uintptr, parms ...uintptr) (ret, errno2 uintptr, err Errno)
+
+// -------------------------------
+// pointer validity test
+// good pointer returns 0
+// bad pointer returns 1
+//
+//go:nosplit
+func ptrtest(uintptr) uint64
+
+// Load memory at ptr location with error handling if the location is invalid
+//
+//go:noescape
+func safeload(ptr uintptr) (value uintptr, error uintptr)
+
+const (
+	entrypointLocationOffset = 8 // From function descriptor
+
+	xplinkEyecatcher   = 0x00c300c500c500f1 // ".C.E.E.1"
+	eyecatcherOffset   = 16                 // From function entrypoint (negative)
+	ppa1LocationOffset = 8                  // From function entrypoint (negative)
+
+	nameLenOffset = 0x14 // From PPA1 start
+	nameOffset    = 0x16 // From PPA1 start
+)
+
+func getPpaOffset(funcptr uintptr) int64 {
+	entrypoint, err := safeload(funcptr + entrypointLocationOffset)
+	if err != 0 {
+		return -1
+	}
+
+	// XPLink functions have ".C.E.E.1" as the first 8 bytes (EBCDIC)
+	val, err := safeload(entrypoint - eyecatcherOffset)
+	if err != 0 {
+		return -1
+	}
+	if val != xplinkEyecatcher {
+		return -1
+	}
+
+	ppaoff, err := safeload(entrypoint - ppa1LocationOffset)
+	if err != 0 {
+		return -1
+	}
+
+	ppaoff >>= 32
+	return int64(ppaoff)
+}
+
+//-------------------------------
+// function descriptor pointer validity test
+// good pointer returns 0
+// bad pointer returns 1
+
+// TODO: currently mksyscall_zos_s390x.go generate empty string for funcName
+// have correct funcName pass to the funcptrtest function
+func funcptrtest(funcptr uintptr, funcName string) uint64 {
+	entrypoint, err := safeload(funcptr + entrypointLocationOffset)
+	if err != 0 {
+		return 1
+	}
+
+	ppaoff := getPpaOffset(funcptr)
+	if ppaoff == -1 {
+		return 1
+	}
+
+	// PPA1 offset value is from the start of the entire function block, not the entrypoint
+	ppa1 := (entrypoint - eyecatcherOffset) + uintptr(ppaoff)
+
+	nameLen, err := safeload(ppa1 + nameLenOffset)
+	if err != 0 {
+		return 1
+	}
+
+	nameLen >>= 48
+	if nameLen > 128 {
+		return 1
+	}
+
+	// no function name input to argument end here
+	if funcName == "" {
+		return 0
+	}
+
+	var funcname [128]byte
+	for i := 0; i < int(nameLen); i += 8 {
+		v, err := safeload(ppa1 + nameOffset + uintptr(i))
+		if err != 0 {
+			return 1
+		}
+		funcname[i] = byte(v >> 56)
+		funcname[i+1] = byte(v >> 48)
+		funcname[i+2] = byte(v >> 40)
+		funcname[i+3] = byte(v >> 32)
+		funcname[i+4] = byte(v >> 24)
+		funcname[i+5] = byte(v >> 16)
+		funcname[i+6] = byte(v >> 8)
+		funcname[i+7] = byte(v)
+	}
+
+	runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS___E2A_L<<4, // __e2a_l
+		[]uintptr{uintptr(unsafe.Pointer(&funcname[0])), nameLen})
+
+	name := string(funcname[:nameLen])
+	if name != funcName {
+		return 1
+	}
+
+	return 0
+}
+
+// For detection of capabilities on a system.
+// Is function descriptor f a valid function?
+func isValidLeFunc(f uintptr) error {
+	ret := funcptrtest(f, "")
+	if ret != 0 {
+		return fmt.Errorf("Bad pointer, not an LE function ")
+	}
+	return nil
+}
+
+// Retrieve function name from descriptor
+func getLeFuncName(f uintptr) (string, error) {
+	// assume it has been checked, only check ppa1 validity here
+	entry := ((*[2]uintptr)(unsafe.Pointer(f)))[1]
+	preamp := ((*[4]uint32)(unsafe.Pointer(entry - eyecatcherOffset)))
+
+	offsetPpa1 := preamp[2]
+	if offsetPpa1 > 0x0ffff {
+		return "", fmt.Errorf("PPA1 offset seems too big 0x%x\n", offsetPpa1)
+	}
+
+	ppa1 := uintptr(unsafe.Pointer(preamp)) + uintptr(offsetPpa1)
+	res := ptrtest(ppa1)
+	if res != 0 {
+		return "", fmt.Errorf("PPA1 address not valid")
+	}
+
+	size := *(*uint16)(unsafe.Pointer(ppa1 + nameLenOffset))
+	if size > 128 {
+		return "", fmt.Errorf("Function name seems too long, length=%d\n", size)
+	}
+
+	var name [128]byte
+	funcname := (*[128]byte)(unsafe.Pointer(ppa1 + nameOffset))
+	copy(name[0:size], funcname[0:size])
+
+	runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS___E2A_L<<4, // __e2a_l
+		[]uintptr{uintptr(unsafe.Pointer(&name[0])), uintptr(size)})
+
+	return string(name[:size]), nil
+}
+
+// Check z/OS version
+func zosLeVersion() (version, release uint32) {
+	p1 := (*(*uintptr)(unsafe.Pointer(uintptr(1208)))) >> 32
+	p1 = *(*uintptr)(unsafe.Pointer(uintptr(p1 + 88)))
+	p1 = *(*uintptr)(unsafe.Pointer(uintptr(p1 + 8)))
+	p1 = *(*uintptr)(unsafe.Pointer(uintptr(p1 + 984)))
+	vrm := *(*uint32)(unsafe.Pointer(p1 + 80))
+	version = (vrm & 0x00ff0000) >> 16
+	release = (vrm & 0x0000ff00) >> 8
+	return
+}
+
+// returns a zos C FILE * for stdio fd 0, 1, 2
+func ZosStdioFilep(fd int32) uintptr {
+	return uintptr(*(*uint64)(unsafe.Pointer(uintptr(*(*uint64)(unsafe.Pointer(uintptr(*(*uint64)(unsafe.Pointer(uintptr(uint64(*(*uint32)(unsafe.Pointer(uintptr(1208)))) + 80))) + uint64((fd+2)<<3))))))))
+}
+
+func copyStat(stat *Stat_t, statLE *Stat_LE_t) {
+	stat.Dev = uint64(statLE.Dev)
+	stat.Ino = uint64(statLE.Ino)
+	stat.Nlink = uint64(statLE.Nlink)
+	stat.Mode = uint32(statLE.Mode)
+	stat.Uid = uint32(statLE.Uid)
+	stat.Gid = uint32(statLE.Gid)
+	stat.Rdev = uint64(statLE.Rdev)
+	stat.Size = statLE.Size
+	stat.Atim.Sec = int64(statLE.Atim)
+	stat.Atim.Nsec = 0 //zos doesn't return nanoseconds
+	stat.Mtim.Sec = int64(statLE.Mtim)
+	stat.Mtim.Nsec = 0 //zos doesn't return nanoseconds
+	stat.Ctim.Sec = int64(statLE.Ctim)
+	stat.Ctim.Nsec = 0 //zos doesn't return nanoseconds
+	stat.Blksize = int64(statLE.Blksize)
+	stat.Blocks = statLE.Blocks
+}
+
+func svcCall(fnptr unsafe.Pointer, argv *unsafe.Pointer, dsa *uint64)
+func svcLoad(name *byte) unsafe.Pointer
+func svcUnload(name *byte, fnptr unsafe.Pointer) int64
+
+func (d *Dirent) NameString() string {
+	if d == nil {
+		return ""
+	}
+	s := string(d.Name[:])
+	idx := strings.IndexByte(s, 0)
+	if idx == -1 {
+		return s
+	} else {
+		return s[:idx]
+	}
+}
+
+func DecodeData(dest []byte, sz int, val uint64) {
+	for i := 0; i < sz; i++ {
+		dest[sz-1-i] = byte((val >> (uint64(i * 8))) & 0xff)
+	}
+}
+
+func EncodeData(data []byte) uint64 {
+	var value uint64
+	sz := len(data)
+	for i := 0; i < sz; i++ {
+		value |= uint64(data[i]) << uint64(((sz - i - 1) * 8))
+	}
+	return value
+}
+
+func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
+	if sa.Port < 0 || sa.Port > 0xFFFF {
+		return nil, 0, EINVAL
+	}
+	sa.raw.Len = SizeofSockaddrInet4
+	sa.raw.Family = AF_INET
+	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
+	p[0] = byte(sa.Port >> 8)
+	p[1] = byte(sa.Port)
+	for i := 0; i < len(sa.Addr); i++ {
+		sa.raw.Addr[i] = sa.Addr[i]
+	}
+	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
+}
+
+func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
+	if sa.Port < 0 || sa.Port > 0xFFFF {
+		return nil, 0, EINVAL
+	}
+	sa.raw.Len = SizeofSockaddrInet6
+	sa.raw.Family = AF_INET6
+	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
+	p[0] = byte(sa.Port >> 8)
+	p[1] = byte(sa.Port)
+	sa.raw.Scope_id = sa.ZoneId
+	for i := 0; i < len(sa.Addr); i++ {
+		sa.raw.Addr[i] = sa.Addr[i]
+	}
+	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
+}
+
+func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
+	name := sa.Name
+	n := len(name)
+	if n >= len(sa.raw.Path) || n == 0 {
+		return nil, 0, EINVAL
+	}
+	sa.raw.Len = byte(3 + n) // 2 for Family, Len; 1 for NUL
+	sa.raw.Family = AF_UNIX
+	for i := 0; i < n; i++ {
+		sa.raw.Path[i] = int8(name[i])
+	}
+	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
+}
+
+func anyToSockaddr(_ int, rsa *RawSockaddrAny) (Sockaddr, error) {
+	// TODO(neeilan): Implement use of first param (fd)
+	switch rsa.Addr.Family {
+	case AF_UNIX:
+		pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
+		sa := new(SockaddrUnix)
+		// For z/OS, only replace NUL with @ when the
+		// length is not zero.
+		if pp.Len != 0 && pp.Path[0] == 0 {
+			// "Abstract" Unix domain socket.
+			// Rewrite leading NUL as @ for textual display.
+			// (This is the standard convention.)
+			// Not friendly to overwrite in place,
+			// but the callers below don't care.
+			pp.Path[0] = '@'
+		}
+
+		// Assume path ends at NUL.
+		//
+		// For z/OS, the length of the name is a field
+		// in the structure. To be on the safe side, we
+		// will still scan the name for a NUL but only
+		// to the length provided in the structure.
+		//
+		// This is not technically the Linux semantics for
+		// abstract Unix domain sockets--they are supposed
+		// to be uninterpreted fixed-size binary blobs--but
+		// everyone uses this convention.
+		n := 0
+		for n < int(pp.Len) && pp.Path[n] != 0 {
+			n++
+		}
+		sa.Name = string(unsafe.Slice((*byte)(unsafe.Pointer(&pp.Path[0])), n))
+		return sa, nil
+
+	case AF_INET:
+		pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
+		sa := new(SockaddrInet4)
+		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
+		sa.Port = int(p[0])<<8 + int(p[1])
+		for i := 0; i < len(sa.Addr); i++ {
+			sa.Addr[i] = pp.Addr[i]
+		}
+		return sa, nil
+
+	case AF_INET6:
+		pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
+		sa := new(SockaddrInet6)
+		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
+		sa.Port = int(p[0])<<8 + int(p[1])
+		sa.ZoneId = pp.Scope_id
+		for i := 0; i < len(sa.Addr); i++ {
+			sa.Addr[i] = pp.Addr[i]
+		}
+		return sa, nil
+	}
+	return nil, EAFNOSUPPORT
+}
+
+func Accept(fd int) (nfd int, sa Sockaddr, err error) {
+	var rsa RawSockaddrAny
+	var len _Socklen = SizeofSockaddrAny
+	nfd, err = accept(fd, &rsa, &len)
+	if err != nil {
+		return
+	}
+	// TODO(neeilan): Remove 0 in call
+	sa, err = anyToSockaddr(0, &rsa)
+	if err != nil {
+		Close(nfd)
+		nfd = 0
+	}
+	return
+}
+
+func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
+	var rsa RawSockaddrAny
+	var len _Socklen = SizeofSockaddrAny
+	nfd, err = accept4(fd, &rsa, &len, flags)
+	if err != nil {
+		return
+	}
+	if len > SizeofSockaddrAny {
+		panic("RawSockaddrAny too small")
+	}
+	// TODO(neeilan): Remove 0 in call
+	sa, err = anyToSockaddr(0, &rsa)
+	if err != nil {
+		Close(nfd)
+		nfd = 0
+	}
+	return
+}
+
+func Ctermid() (tty string, err error) {
+	var termdev [1025]byte
+	runtime.EnterSyscall()
+	r0, err2, err1 := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS___CTERMID_A<<4, uintptr(unsafe.Pointer(&termdev[0])))
+	runtime.ExitSyscall()
+	if r0 == 0 {
+		return "", fmt.Errorf("%s (errno2=0x%x)\n", err1.Error(), err2)
+	}
+	s := string(termdev[:])
+	idx := strings.Index(s, string(rune(0)))
+	if idx == -1 {
+		tty = s
+	} else {
+		tty = s[:idx]
+	}
+	return
+}
+
+func (iov *Iovec) SetLen(length int) {
+	iov.Len = uint64(length)
+}
+
+func (msghdr *Msghdr) SetControllen(length int) {
+	msghdr.Controllen = int32(length)
+}
+
+func (cmsg *Cmsghdr) SetLen(length int) {
+	cmsg.Len = int32(length)
+}
+
+//sys   fcntl(fd int, cmd int, arg int) (val int, err error)
+//sys   Flistxattr(fd int, dest []byte) (sz int, err error) = SYS___FLISTXATTR_A
+//sys   Fremovexattr(fd int, attr string) (err error) = SYS___FREMOVEXATTR_A
+//sys	read(fd int, p []byte) (n int, err error)
+//sys	write(fd int, p []byte) (n int, err error)
+
+//sys   Fgetxattr(fd int, attr string, dest []byte) (sz int, err error) = SYS___FGETXATTR_A
+//sys   Fsetxattr(fd int, attr string, data []byte, flag int) (err error) = SYS___FSETXATTR_A
+
+//sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error) = SYS___ACCEPT_A
+//sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) = SYS___ACCEPT4_A
+//sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) = SYS___BIND_A
+//sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error) = SYS___CONNECT_A
+//sysnb	getgroups(n int, list *_Gid_t) (nn int, err error)
+//sysnb	setgroups(n int, list *_Gid_t) (err error)
+//sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
+//sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
+//sysnb	socket(domain int, typ int, proto int) (fd int, err error)
+//sysnb	socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
+//sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) = SYS___GETPEERNAME_A
+//sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error) = SYS___GETSOCKNAME_A
+//sys   Removexattr(path string, attr string) (err error) = SYS___REMOVEXATTR_A
+//sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error) = SYS___RECVFROM_A
+//sys	sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error) = SYS___SENDTO_A
+//sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error) = SYS___RECVMSG_A
+//sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error) = SYS___SENDMSG_A
+//sys   mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error) = SYS_MMAP
+//sys   munmap(addr uintptr, length uintptr) (err error) = SYS_MUNMAP
+//sys   ioctl(fd int, req int, arg uintptr) (err error) = SYS_IOCTL
+//sys   ioctlPtr(fd int, req int, arg unsafe.Pointer) (err error) = SYS_IOCTL
+//sys	shmat(id int, addr uintptr, flag int) (ret uintptr, err error) = SYS_SHMAT
+//sys	shmctl(id int, cmd int, buf *SysvShmDesc) (result int, err error) = SYS_SHMCTL64
+//sys	shmdt(addr uintptr) (err error) = SYS_SHMDT
+//sys	shmget(key int, size int, flag int) (id int, err error) = SYS_SHMGET
+
+//sys   Access(path string, mode uint32) (err error) = SYS___ACCESS_A
+//sys   Chdir(path string) (err error) = SYS___CHDIR_A
+//sys	Chown(path string, uid int, gid int) (err error) = SYS___CHOWN_A
+//sys	Chmod(path string, mode uint32) (err error) = SYS___CHMOD_A
+//sys   Creat(path string, mode uint32) (fd int, err error) = SYS___CREAT_A
+//sys	Dup(oldfd int) (fd int, err error)
+//sys	Dup2(oldfd int, newfd int) (err error)
+//sys	Dup3(oldfd int, newfd int, flags int) (err error) = SYS_DUP3
+//sys	Dirfd(dirp uintptr) (fd int, err error) = SYS_DIRFD
+//sys	EpollCreate(size int) (fd int, err error) = SYS_EPOLL_CREATE
+//sys	EpollCreate1(flags int) (fd int, err error) = SYS_EPOLL_CREATE1
+//sys	EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error) = SYS_EPOLL_CTL
+//sys	EpollPwait(epfd int, events []EpollEvent, msec int, sigmask *int) (n int, err error) = SYS_EPOLL_PWAIT
+//sys	EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_WAIT
+//sys	Errno2() (er2 int) = SYS___ERRNO2
+//sys	Eventfd(initval uint, flags int) (fd int, err error) = SYS_EVENTFD
+//sys	Exit(code int)
+//sys	Faccessat(dirfd int, path string, mode uint32, flags int) (err error) = SYS___FACCESSAT_A
+
+func Faccessat2(dirfd int, path string, mode uint32, flags int) (err error) {
+	return Faccessat(dirfd, path, mode, flags)
+}
+
+//sys	Fchdir(fd int) (err error)
+//sys	Fchmod(fd int, mode uint32) (err error)
+//sys	Fchmodat(dirfd int, path string, mode uint32, flags int) (err error) = SYS___FCHMODAT_A
+//sys	Fchown(fd int, uid int, gid int) (err error)
+//sys	Fchownat(fd int, path string, uid int, gid int, flags int) (err error) = SYS___FCHOWNAT_A
+//sys	FcntlInt(fd uintptr, cmd int, arg int) (retval int, err error) = SYS_FCNTL
+//sys	Fdatasync(fd int) (err error) = SYS_FDATASYNC
+//sys	fstat(fd int, stat *Stat_LE_t) (err error)
+//sys	fstatat(dirfd int, path string, stat *Stat_LE_t, flags int) (err error) = SYS___FSTATAT_A
+
+func Fstat(fd int, stat *Stat_t) (err error) {
+	var statLE Stat_LE_t
+	err = fstat(fd, &statLE)
+	copyStat(stat, &statLE)
+	return
+}
+
+func Fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) {
+	var statLE Stat_LE_t
+	err = fstatat(dirfd, path, &statLE, flags)
+	copyStat(stat, &statLE)
+	return
+}
+
+func impl_Getxattr(path string, attr string, dest []byte) (sz int, err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(dest) > 0 {
+		_p2 = unsafe.Pointer(&dest[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___GETXATTR_A<<4, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(dest)))
+	sz = int(r0)
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+//go:nosplit
+func get_GetxattrAddr() *(func(path string, attr string, dest []byte) (sz int, err error))
+
+var Getxattr = enter_Getxattr
+
+func enter_Getxattr(path string, attr string, dest []byte) (sz int, err error) {
+	funcref := get_GetxattrAddr()
+	if validGetxattr() {
+		*funcref = impl_Getxattr
+	} else {
+		*funcref = error_Getxattr
+	}
+	return (*funcref)(path, attr, dest)
+}
+
+func error_Getxattr(path string, attr string, dest []byte) (sz int, err error) {
+	return -1, ENOSYS
+}
+
+func validGetxattr() bool {
+	if funcptrtest(GetZosLibVec()+SYS___GETXATTR_A<<4, "") == 0 {
+		if name, err := getLeFuncName(GetZosLibVec() + SYS___GETXATTR_A<<4); err == nil {
+			return name == "__getxattr_a"
+		}
+	}
+	return false
+}
+
+//sys   Lgetxattr(link string, attr string, dest []byte) (sz int, err error) = SYS___LGETXATTR_A
+//sys   Lsetxattr(path string, attr string, data []byte, flags int) (err error) = SYS___LSETXATTR_A
+
+func impl_Setxattr(path string, attr string, data []byte, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = BytePtrFromString(attr)
+	if err != nil {
+		return
+	}
+	var _p2 unsafe.Pointer
+	if len(data) > 0 {
+		_p2 = unsafe.Pointer(&data[0])
+	} else {
+		_p2 = unsafe.Pointer(&_zero)
+	}
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___SETXATTR_A<<4, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(_p2), uintptr(len(data)), uintptr(flags))
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+//go:nosplit
+func get_SetxattrAddr() *(func(path string, attr string, data []byte, flags int) (err error))
+
+var Setxattr = enter_Setxattr
+
+func enter_Setxattr(path string, attr string, data []byte, flags int) (err error) {
+	funcref := get_SetxattrAddr()
+	if validSetxattr() {
+		*funcref = impl_Setxattr
+	} else {
+		*funcref = error_Setxattr
+	}
+	return (*funcref)(path, attr, data, flags)
+}
+
+func error_Setxattr(path string, attr string, data []byte, flags int) (err error) {
+	return ENOSYS
+}
+
+func validSetxattr() bool {
+	if funcptrtest(GetZosLibVec()+SYS___SETXATTR_A<<4, "") == 0 {
+		if name, err := getLeFuncName(GetZosLibVec() + SYS___SETXATTR_A<<4); err == nil {
+			return name == "__setxattr_a"
+		}
+	}
+	return false
+}
+
+//sys	Fstatfs(fd int, buf *Statfs_t) (err error) = SYS_FSTATFS
+//sys	Fstatvfs(fd int, stat *Statvfs_t) (err error) = SYS_FSTATVFS
+//sys	Fsync(fd int) (err error)
+//sys	Futimes(fd int, tv []Timeval) (err error) = SYS_FUTIMES
+//sys	Futimesat(dirfd int, path string, tv []Timeval) (err error) = SYS___FUTIMESAT_A
+//sys	Ftruncate(fd int, length int64) (err error)
+//sys	Getrandom(buf []byte, flags int) (n int, err error) = SYS_GETRANDOM
+//sys	InotifyInit() (fd int, err error) = SYS_INOTIFY_INIT
+//sys	InotifyInit1(flags int) (fd int, err error) = SYS_INOTIFY_INIT1
+//sys	InotifyAddWatch(fd int, pathname string, mask uint32) (watchdesc int, err error) = SYS___INOTIFY_ADD_WATCH_A
+//sys	InotifyRmWatch(fd int, watchdesc uint32) (success int, err error) = SYS_INOTIFY_RM_WATCH
+//sys   Listxattr(path string, dest []byte) (sz int, err error) = SYS___LISTXATTR_A
+//sys   Llistxattr(path string, dest []byte) (sz int, err error) = SYS___LLISTXATTR_A
+//sys   Lremovexattr(path string, attr string) (err error) = SYS___LREMOVEXATTR_A
+//sys	Lutimes(path string, tv []Timeval) (err error) = SYS___LUTIMES_A
+//sys   Mprotect(b []byte, prot int) (err error) = SYS_MPROTECT
+//sys   Msync(b []byte, flags int) (err error) = SYS_MSYNC
+//sys   Console2(cmsg *ConsMsg2, modstr *byte, concmd *uint32) (err error) = SYS___CONSOLE2
+
+// Pipe2 begin
+
+//go:nosplit
+func getPipe2Addr() *(func([]int, int) error)
+
+var Pipe2 = pipe2Enter
+
+func pipe2Enter(p []int, flags int) (err error) {
+	if funcptrtest(GetZosLibVec()+SYS_PIPE2<<4, "") == 0 {
+		*getPipe2Addr() = pipe2Impl
+	} else {
+		*getPipe2Addr() = pipe2Error
+	}
+	return (*getPipe2Addr())(p, flags)
+}
+
+func pipe2Impl(p []int, flags int) (err error) {
+	var pp [2]_C_int
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_PIPE2<<4, uintptr(unsafe.Pointer(&pp[0])), uintptr(flags))
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+	} else {
+		p[0] = int(pp[0])
+		p[1] = int(pp[1])
+	}
+	return
+}
+func pipe2Error(p []int, flags int) (err error) {
+	return fmt.Errorf("Pipe2 is not available on this system")
+}
+
+// Pipe2 end
+
+//sys   Poll(fds []PollFd, timeout int) (n int, err error) = SYS_POLL
+
+func Readdir(dir uintptr) (dirent *Dirent, err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___READDIR_A<<4, uintptr(dir))
+	runtime.ExitSyscall()
+	dirent = (*Dirent)(unsafe.Pointer(r0))
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+//sys	Readdir_r(dirp uintptr, entry *direntLE, result **direntLE) (err error) = SYS___READDIR_R_A
+//sys	Statfs(path string, buf *Statfs_t) (err error) = SYS___STATFS_A
+//sys	Syncfs(fd int) (err error) = SYS_SYNCFS
+//sys   Times(tms *Tms) (ticks uintptr, err error) = SYS_TIMES
+//sys   W_Getmntent(buff *byte, size int) (lastsys int, err error) = SYS_W_GETMNTENT
+//sys   W_Getmntent_A(buff *byte, size int) (lastsys int, err error) = SYS___W_GETMNTENT_A
+
+//sys   mount_LE(path string, filesystem string, fstype string, mtm uint32, parmlen int32, parm string) (err error) = SYS___MOUNT_A
+//sys   unmount_LE(filesystem string, mtm int) (err error) = SYS___UMOUNT_A
+//sys   Chroot(path string) (err error) = SYS___CHROOT_A
+//sys   Select(nmsgsfds int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (ret int, err error) = SYS_SELECT
+//sysnb Uname(buf *Utsname) (err error) = SYS_____OSNAME_A
+//sys   Unshare(flags int) (err error) = SYS_UNSHARE
+
+func Ptsname(fd int) (name string, err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS___PTSNAME_A<<4, uintptr(fd))
+	runtime.ExitSyscall()
+	if r0 == 0 {
+		err = errnoErr2(e1, e2)
+	} else {
+		name = u2s(unsafe.Pointer(r0))
+	}
+	return
+}
+
+func u2s(cstr unsafe.Pointer) string {
+	str := (*[1024]uint8)(cstr)
+	i := 0
+	for str[i] != 0 {
+		i++
+	}
+	return string(str[:i])
+}
+
+func Close(fd int) (err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_CLOSE<<4, uintptr(fd))
+	runtime.ExitSyscall()
+	for i := 0; e1 == EAGAIN && i < 10; i++ {
+		runtime.EnterSyscall()
+		CallLeFuncWithErr(GetZosLibVec()+SYS_USLEEP<<4, uintptr(10))
+		runtime.ExitSyscall()
+		runtime.EnterSyscall()
+		r0, e2, e1 = CallLeFuncWithErr(GetZosLibVec()+SYS_CLOSE<<4, uintptr(fd))
+		runtime.ExitSyscall()
+	}
+	if r0 != 0 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+// Dummy function: there are no semantics for Madvise on z/OS
+func Madvise(b []byte, advice int) (err error) {
+	return
+}
+
+func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
+	return mapper.Mmap(fd, offset, length, prot, flags)
+}
+
+func Munmap(b []byte) (err error) {
+	return mapper.Munmap(b)
+}
+
+//sys   Gethostname(buf []byte) (err error) = SYS___GETHOSTNAME_A
+//sysnb	Getgid() (gid int)
+//sysnb	Getpid() (pid int)
+//sysnb	Getpgid(pid int) (pgid int, err error) = SYS_GETPGID
+
+func Getpgrp() (pid int) {
+	pid, _ = Getpgid(0)
+	return
+}
+
+//sysnb	Getppid() (pid int)
+//sys	Getpriority(which int, who int) (prio int, err error)
+//sysnb	Getrlimit(resource int, rlim *Rlimit) (err error) = SYS_GETRLIMIT
+
+//sysnb getrusage(who int, rusage *rusage_zos) (err error) = SYS_GETRUSAGE
+
+func Getrusage(who int, rusage *Rusage) (err error) {
+	var ruz rusage_zos
+	err = getrusage(who, &ruz)
+	//Only the first two fields of Rusage are set
+	rusage.Utime.Sec = ruz.Utime.Sec
+	rusage.Utime.Usec = int64(ruz.Utime.Usec)
+	rusage.Stime.Sec = ruz.Stime.Sec
+	rusage.Stime.Usec = int64(ruz.Stime.Usec)
+	return
+}
+
+//sys	Getegid() (egid int) = SYS_GETEGID
+//sys	Geteuid() (euid int) = SYS_GETEUID
+//sysnb Getsid(pid int) (sid int, err error) = SYS_GETSID
+//sysnb	Getuid() (uid int)
+//sysnb	Kill(pid int, sig Signal) (err error)
+//sys	Lchown(path string, uid int, gid int) (err error) = SYS___LCHOWN_A
+//sys	Link(path string, link string) (err error) = SYS___LINK_A
+//sys	Linkat(oldDirFd int, oldPath string, newDirFd int, newPath string, flags int) (err error) = SYS___LINKAT_A
+//sys	Listen(s int, n int) (err error)
+//sys	lstat(path string, stat *Stat_LE_t) (err error) = SYS___LSTAT_A
+
+func Lstat(path string, stat *Stat_t) (err error) {
+	var statLE Stat_LE_t
+	err = lstat(path, &statLE)
+	copyStat(stat, &statLE)
+	return
+}
+
+// for checking symlinks begins with $VERSION/ $SYSNAME/ $SYSSYMR/ $SYSSYMA/
+func isSpecialPath(path []byte) (v bool) {
+	var special = [4][8]byte{
+		[8]byte{'V', 'E', 'R', 'S', 'I', 'O', 'N', '/'},
+		[8]byte{'S', 'Y', 'S', 'N', 'A', 'M', 'E', '/'},
+		[8]byte{'S', 'Y', 'S', 'S', 'Y', 'M', 'R', '/'},
+		[8]byte{'S', 'Y', 'S', 'S', 'Y', 'M', 'A', '/'}}
+
+	var i, j int
+	for i = 0; i < len(special); i++ {
+		for j = 0; j < len(special[i]); j++ {
+			if path[j] != special[i][j] {
+				break
+			}
+		}
+		if j == len(special[i]) {
+			return true
+		}
+	}
+	return false
+}
+
+func realpath(srcpath string, abspath []byte) (pathlen int, errno int) {
+	var source [1024]byte
+	copy(source[:], srcpath)
+	source[len(srcpath)] = 0
+	ret := runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS___REALPATH_A<<4, //__realpath_a()
+		[]uintptr{uintptr(unsafe.Pointer(&source[0])),
+			uintptr(unsafe.Pointer(&abspath[0]))})
+	if ret != 0 {
+		index := bytes.IndexByte(abspath[:], byte(0))
+		if index != -1 {
+			return index, 0
+		}
+	} else {
+		errptr := (*int)(unsafe.Pointer(runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS___ERRNO<<4, []uintptr{}))) //__errno()
+		return 0, *errptr
+	}
+	return 0, 245 // EBADDATA   245
+}
+
+func Readlink(path string, buf []byte) (n int, err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(buf) > 0 {
+		_p1 = unsafe.Pointer(&buf[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	n = int(runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS___READLINK_A<<4,
+		[]uintptr{uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(buf))}))
+	runtime.KeepAlive(unsafe.Pointer(_p0))
+	if n == -1 {
+		value := *(*int32)(unsafe.Pointer(runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS___ERRNO<<4, []uintptr{})))
+		err = errnoErr(Errno(value))
+	} else {
+		if buf[0] == '$' {
+			if isSpecialPath(buf[1:9]) {
+				cnt, err1 := realpath(path, buf)
+				if err1 == 0 {
+					n = cnt
+				}
+			}
+		}
+	}
+	return
+}
+
+func impl_Readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	var _p1 unsafe.Pointer
+	if len(buf) > 0 {
+		_p1 = unsafe.Pointer(&buf[0])
+	} else {
+		_p1 = unsafe.Pointer(&_zero)
+	}
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___READLINKAT_A<<4, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(_p1), uintptr(len(buf)))
+	runtime.ExitSyscall()
+	n = int(r0)
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+		return n, err
+	} else {
+		if buf[0] == '$' {
+			if isSpecialPath(buf[1:9]) {
+				cnt, err1 := realpath(path, buf)
+				if err1 == 0 {
+					n = cnt
+				}
+			}
+		}
+	}
+	return
+}
+
+//go:nosplit
+func get_ReadlinkatAddr() *(func(dirfd int, path string, buf []byte) (n int, err error))
+
+var Readlinkat = enter_Readlinkat
+
+func enter_Readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
+	funcref := get_ReadlinkatAddr()
+	if funcptrtest(GetZosLibVec()+SYS___READLINKAT_A<<4, "") == 0 {
+		*funcref = impl_Readlinkat
+	} else {
+		*funcref = error_Readlinkat
+	}
+	return (*funcref)(dirfd, path, buf)
+}
+
+func error_Readlinkat(dirfd int, path string, buf []byte) (n int, err error) {
+	n = -1
+	err = ENOSYS
+	return
+}
+
+//sys	Mkdir(path string, mode uint32) (err error) = SYS___MKDIR_A
+//sys	Mkdirat(dirfd int, path string, mode uint32) (err error) = SYS___MKDIRAT_A
+//sys   Mkfifo(path string, mode uint32) (err error) = SYS___MKFIFO_A
+//sys	Mknod(path string, mode uint32, dev int) (err error) = SYS___MKNOD_A
+//sys	Mknodat(dirfd int, path string, mode uint32, dev int) (err error) = SYS___MKNODAT_A
+//sys	PivotRoot(newroot string, oldroot string) (err error) = SYS___PIVOT_ROOT_A
+//sys	Pread(fd int, p []byte, offset int64) (n int, err error)
+//sys	Pwrite(fd int, p []byte, offset int64) (n int, err error)
+//sys	Prctl(option int, arg2 uintptr, arg3 uintptr, arg4 uintptr, arg5 uintptr) (err error) = SYS___PRCTL_A
+//sysnb	Prlimit(pid int, resource int, newlimit *Rlimit, old *Rlimit) (err error) = SYS_PRLIMIT
+//sys	Rename(from string, to string) (err error) = SYS___RENAME_A
+//sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error) = SYS___RENAMEAT_A
+//sys	Renameat2(olddirfd int, oldpath string, newdirfd int, newpath string, flags uint) (err error) = SYS___RENAMEAT2_A
+//sys	Rmdir(path string) (err error) = SYS___RMDIR_A
+//sys   Seek(fd int, offset int64, whence int) (off int64, err error) = SYS_LSEEK
+//sys	Setegid(egid int) (err error) = SYS_SETEGID
+//sys	Seteuid(euid int) (err error) = SYS_SETEUID
+//sys	Sethostname(p []byte) (err error) = SYS___SETHOSTNAME_A
+//sys   Setns(fd int, nstype int) (err error) = SYS_SETNS
+//sys	Setpriority(which int, who int, prio int) (err error)
+//sysnb	Setpgid(pid int, pgid int) (err error) = SYS_SETPGID
+//sysnb	Setrlimit(resource int, lim *Rlimit) (err error)
+//sysnb	Setregid(rgid int, egid int) (err error) = SYS_SETREGID
+//sysnb	Setreuid(ruid int, euid int) (err error) = SYS_SETREUID
+//sysnb	Setsid() (pid int, err error) = SYS_SETSID
+//sys	Setuid(uid int) (err error) = SYS_SETUID
+//sys	Setgid(uid int) (err error) = SYS_SETGID
+//sys	Shutdown(fd int, how int) (err error)
+//sys	stat(path string, statLE *Stat_LE_t) (err error) = SYS___STAT_A
+
+func Stat(path string, sta *Stat_t) (err error) {
+	var statLE Stat_LE_t
+	err = stat(path, &statLE)
+	copyStat(sta, &statLE)
+	return
+}
+
+//sys	Symlink(path string, link string) (err error) = SYS___SYMLINK_A
+//sys	Symlinkat(oldPath string, dirfd int, newPath string) (err error) = SYS___SYMLINKAT_A
+//sys	Sync() = SYS_SYNC
+//sys	Truncate(path string, length int64) (err error) = SYS___TRUNCATE_A
+//sys	Tcgetattr(fildes int, termptr *Termios) (err error) = SYS_TCGETATTR
+//sys	Tcsetattr(fildes int, when int, termptr *Termios) (err error) = SYS_TCSETATTR
+//sys	Umask(mask int) (oldmask int)
+//sys	Unlink(path string) (err error) = SYS___UNLINK_A
+//sys	Unlinkat(dirfd int, path string, flags int) (err error) = SYS___UNLINKAT_A
+//sys	Utime(path string, utim *Utimbuf) (err error) = SYS___UTIME_A
+
+//sys	open(path string, mode int, perm uint32) (fd int, err error) = SYS___OPEN_A
+
+func Open(path string, mode int, perm uint32) (fd int, err error) {
+	if mode&O_ACCMODE == 0 {
+		mode |= O_RDONLY
+	}
+	return open(path, mode, perm)
+}
+
+//sys	openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) = SYS___OPENAT_A
+
+func Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error) {
+	if flags&O_ACCMODE == 0 {
+		flags |= O_RDONLY
+	}
+	return openat(dirfd, path, flags, mode)
+}
+
+//sys	openat2(dirfd int, path string, open_how *OpenHow, size int) (fd int, err error) = SYS___OPENAT2_A
+
+func Openat2(dirfd int, path string, how *OpenHow) (fd int, err error) {
+	if how.Flags&O_ACCMODE == 0 {
+		how.Flags |= O_RDONLY
+	}
+	return openat2(dirfd, path, how, SizeofOpenHow)
+}
+
+func ZosFdToPath(dirfd int) (path string, err error) {
+	var buffer [1024]byte
+	runtime.EnterSyscall()
+	ret, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_W_IOCTL<<4, uintptr(dirfd), 17, 1024, uintptr(unsafe.Pointer(&buffer[0])))
+	runtime.ExitSyscall()
+	if ret == 0 {
+		zb := bytes.IndexByte(buffer[:], 0)
+		if zb == -1 {
+			zb = len(buffer)
+		}
+		CallLeFuncWithErr(GetZosLibVec()+SYS___E2A_L<<4, uintptr(unsafe.Pointer(&buffer[0])), uintptr(zb))
+		return string(buffer[:zb]), nil
+	}
+	return "", errnoErr2(e1, e2)
+}
+
+//sys	remove(path string) (err error)
+
+func Remove(path string) error {
+	return remove(path)
+}
+
+const ImplementsGetwd = true
+
+func Getcwd(buf []byte) (n int, err error) {
+	var p unsafe.Pointer
+	if len(buf) > 0 {
+		p = unsafe.Pointer(&buf[0])
+	} else {
+		p = unsafe.Pointer(&_zero)
+	}
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS___GETCWD_A<<4, uintptr(p), uintptr(len(buf)))
+	runtime.ExitSyscall()
+	n = clen(buf) + 1
+	if r0 == 0 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+func Getwd() (wd string, err error) {
+	var buf [PathMax]byte
+	n, err := Getcwd(buf[0:])
+	if err != nil {
+		return "", err
+	}
+	// Getcwd returns the number of bytes written to buf, including the NUL.
+	if n < 1 || n > len(buf) || buf[n-1] != 0 {
+		return "", EINVAL
+	}
+	return string(buf[0 : n-1]), nil
+}
+
+func Getgroups() (gids []int, err error) {
+	n, err := getgroups(0, nil)
+	if err != nil {
+		return nil, err
+	}
+	if n == 0 {
+		return nil, nil
+	}
+
+	// Sanity check group count.  Max is 1<<16 on Linux.
+	if n < 0 || n > 1<<20 {
+		return nil, EINVAL
+	}
+
+	a := make([]_Gid_t, n)
+	n, err = getgroups(n, &a[0])
+	if err != nil {
+		return nil, err
+	}
+	gids = make([]int, n)
+	for i, v := range a[0:n] {
+		gids[i] = int(v)
+	}
+	return
+}
+
+func Setgroups(gids []int) (err error) {
+	if len(gids) == 0 {
+		return setgroups(0, nil)
+	}
+
+	a := make([]_Gid_t, len(gids))
+	for i, v := range gids {
+		a[i] = _Gid_t(v)
+	}
+	return setgroups(len(a), &a[0])
+}
+
+func gettid() uint64
+
+func Gettid() (tid int) {
+	return int(gettid())
+}
+
+type WaitStatus uint32
+
+// Wait status is 7 bits at bottom, either 0 (exited),
+// 0x7F (stopped), or a signal number that caused an exit.
+// The 0x80 bit is whether there was a core dump.
+// An extra number (exit code, signal causing a stop)
+// is in the high bits.  At least that's the idea.
+// There are various irregularities.  For example, the
+// "continued" status is 0xFFFF, distinguishing itself
+// from stopped via the core dump bit.
+
+const (
+	mask    = 0x7F
+	core    = 0x80
+	exited  = 0x00
+	stopped = 0x7F
+	shift   = 8
+)
+
+func (w WaitStatus) Exited() bool { return w&mask == exited }
+
+func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != exited }
+
+func (w WaitStatus) Stopped() bool { return w&0xFF == stopped }
+
+func (w WaitStatus) Continued() bool { return w == 0xFFFF }
+
+func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
+
+func (w WaitStatus) ExitStatus() int {
+	if !w.Exited() {
+		return -1
+	}
+	return int(w>>shift) & 0xFF
+}
+
+func (w WaitStatus) Signal() Signal {
+	if !w.Signaled() {
+		return -1
+	}
+	return Signal(w & mask)
+}
+
+func (w WaitStatus) StopSignal() Signal {
+	if !w.Stopped() {
+		return -1
+	}
+	return Signal(w>>shift) & 0xFF
+}
+
+func (w WaitStatus) TrapCause() int { return -1 }
+
+//sys	waitid(idType int, id int, info *Siginfo, options int) (err error)
+
+func Waitid(idType int, id int, info *Siginfo, options int, rusage *Rusage) (err error) {
+	return waitid(idType, id, info, options)
+}
+
+//sys	waitpid(pid int, wstatus *_C_int, options int) (wpid int, err error)
+
+func impl_Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_WAIT4<<4, uintptr(pid), uintptr(unsafe.Pointer(wstatus)), uintptr(options), uintptr(unsafe.Pointer(rusage)))
+	runtime.ExitSyscall()
+	wpid = int(r0)
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+//go:nosplit
+func get_Wait4Addr() *(func(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error))
+
+var Wait4 = enter_Wait4
+
+func enter_Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
+	funcref := get_Wait4Addr()
+	if funcptrtest(GetZosLibVec()+SYS_WAIT4<<4, "") == 0 {
+		*funcref = impl_Wait4
+	} else {
+		*funcref = legacyWait4
+	}
+	return (*funcref)(pid, wstatus, options, rusage)
+}
+
+func legacyWait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
+	// TODO(mundaym): z/OS doesn't have wait4. I don't think getrusage does what we want.
+	// At the moment rusage will not be touched.
+	var status _C_int
+	wpid, err = waitpid(pid, &status, options)
+	if wstatus != nil {
+		*wstatus = WaitStatus(status)
+	}
+	return
+}
+
+//sysnb	gettimeofday(tv *timeval_zos) (err error)
+
+func Gettimeofday(tv *Timeval) (err error) {
+	var tvz timeval_zos
+	err = gettimeofday(&tvz)
+	tv.Sec = tvz.Sec
+	tv.Usec = int64(tvz.Usec)
+	return
+}
+
+func Time(t *Time_t) (tt Time_t, err error) {
+	var tv Timeval
+	err = Gettimeofday(&tv)
+	if err != nil {
+		return 0, err
+	}
+	if t != nil {
+		*t = Time_t(tv.Sec)
+	}
+	return Time_t(tv.Sec), nil
+}
+
+func setTimespec(sec, nsec int64) Timespec {
+	return Timespec{Sec: sec, Nsec: nsec}
+}
+
+func setTimeval(sec, usec int64) Timeval { //fix
+	return Timeval{Sec: sec, Usec: usec}
+}
+
+//sysnb pipe(p *[2]_C_int) (err error)
+
+func Pipe(p []int) (err error) {
+	if len(p) != 2 {
+		return EINVAL
+	}
+	var pp [2]_C_int
+	err = pipe(&pp)
+	p[0] = int(pp[0])
+	p[1] = int(pp[1])
+	return
+}
+
+//sys	utimes(path string, timeval *[2]Timeval) (err error) = SYS___UTIMES_A
+
+func Utimes(path string, tv []Timeval) (err error) {
+	if tv == nil {
+		return utimes(path, nil)
+	}
+	if len(tv) != 2 {
+		return EINVAL
+	}
+	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
+}
+
+//sys	utimensat(dirfd int, path string, ts *[2]Timespec, flags int) (err error) = SYS___UTIMENSAT_A
+
+func validUtimensat() bool {
+	if funcptrtest(GetZosLibVec()+SYS___UTIMENSAT_A<<4, "") == 0 {
+		if name, err := getLeFuncName(GetZosLibVec() + SYS___UTIMENSAT_A<<4); err == nil {
+			return name == "__utimensat_a"
+		}
+	}
+	return false
+}
+
+// Begin UtimesNano
+
+//go:nosplit
+func get_UtimesNanoAddr() *(func(path string, ts []Timespec) (err error))
+
+var UtimesNano = enter_UtimesNano
+
+func enter_UtimesNano(path string, ts []Timespec) (err error) {
+	funcref := get_UtimesNanoAddr()
+	if validUtimensat() {
+		*funcref = utimesNanoImpl
+	} else {
+		*funcref = legacyUtimesNano
+	}
+	return (*funcref)(path, ts)
+}
+
+func utimesNanoImpl(path string, ts []Timespec) (err error) {
+	if ts == nil {
+		return utimensat(AT_FDCWD, path, nil, 0)
+	}
+	if len(ts) != 2 {
+		return EINVAL
+	}
+	return utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
+}
+
+func legacyUtimesNano(path string, ts []Timespec) (err error) {
+	if len(ts) != 2 {
+		return EINVAL
+	}
+	// Not as efficient as it could be because Timespec and
+	// Timeval have different types in the different OSes
+	tv := [2]Timeval{
+		NsecToTimeval(TimespecToNsec(ts[0])),
+		NsecToTimeval(TimespecToNsec(ts[1])),
+	}
+	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
+}
+
+// End UtimesNano
+
+// Begin UtimesNanoAt
+
+//go:nosplit
+func get_UtimesNanoAtAddr() *(func(dirfd int, path string, ts []Timespec, flags int) (err error))
+
+var UtimesNanoAt = enter_UtimesNanoAt
+
+func enter_UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) (err error) {
+	funcref := get_UtimesNanoAtAddr()
+	if validUtimensat() {
+		*funcref = utimesNanoAtImpl
+	} else {
+		*funcref = legacyUtimesNanoAt
+	}
+	return (*funcref)(dirfd, path, ts, flags)
+}
+
+func utimesNanoAtImpl(dirfd int, path string, ts []Timespec, flags int) (err error) {
+	if ts == nil {
+		return utimensat(dirfd, path, nil, flags)
+	}
+	if len(ts) != 2 {
+		return EINVAL
+	}
+	return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags)
+}
+
+func legacyUtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) (err error) {
+	if path[0] != '/' {
+		dirPath, err := ZosFdToPath(dirfd)
+		if err != nil {
+			return err
+		}
+		path = dirPath + "/" + path
+	}
+	if flags == AT_SYMLINK_NOFOLLOW {
+		if len(ts) != 2 {
+			return EINVAL
+		}
+
+		if ts[0].Nsec >= 5e8 {
+			ts[0].Sec++
+		}
+		ts[0].Nsec = 0
+		if ts[1].Nsec >= 5e8 {
+			ts[1].Sec++
+		}
+		ts[1].Nsec = 0
+
+		// Not as efficient as it could be because Timespec and
+		// Timeval have different types in the different OSes
+		tv := []Timeval{
+			NsecToTimeval(TimespecToNsec(ts[0])),
+			NsecToTimeval(TimespecToNsec(ts[1])),
+		}
+		return Lutimes(path, tv)
+	}
+	return UtimesNano(path, ts)
+}
+
+// End UtimesNanoAt
+
+func Getsockname(fd int) (sa Sockaddr, err error) {
+	var rsa RawSockaddrAny
+	var len _Socklen = SizeofSockaddrAny
+	if err = getsockname(fd, &rsa, &len); err != nil {
+		return
+	}
+	// TODO(neeilan) : Remove this 0 ( added to get sys/unix compiling on z/OS )
+	return anyToSockaddr(0, &rsa)
+}
+
+const (
+	// identifier constants
+	nwmHeaderIdentifier    = 0xd5e6d4c8
+	nwmFilterIdentifier    = 0xd5e6d4c6
+	nwmTCPConnIdentifier   = 0xd5e6d4c3
+	nwmRecHeaderIdentifier = 0xd5e6d4d9
+	nwmIPStatsIdentifier   = 0xd5e6d4c9d7e2e340
+	nwmIPGStatsIdentifier  = 0xd5e6d4c9d7c7e2e3
+	nwmTCPStatsIdentifier  = 0xd5e6d4e3c3d7e2e3
+	nwmUDPStatsIdentifier  = 0xd5e6d4e4c4d7e2e3
+	nwmICMPGStatsEntry     = 0xd5e6d4c9c3d4d7c7
+	nwmICMPTStatsEntry     = 0xd5e6d4c9c3d4d7e3
+
+	// nwmHeader constants
+	nwmVersion1   = 1
+	nwmVersion2   = 2
+	nwmCurrentVer = 2
+
+	nwmTCPConnType     = 1
+	nwmGlobalStatsType = 14
+
+	// nwmFilter constants
+	nwmFilterLclAddrMask = 0x20000000 // Local address
+	nwmFilterSrcAddrMask = 0x20000000 // Source address
+	nwmFilterLclPortMask = 0x10000000 // Local port
+	nwmFilterSrcPortMask = 0x10000000 // Source port
+
+	// nwmConnEntry constants
+	nwmTCPStateClosed   = 1
+	nwmTCPStateListen   = 2
+	nwmTCPStateSynSent  = 3
+	nwmTCPStateSynRcvd  = 4
+	nwmTCPStateEstab    = 5
+	nwmTCPStateFinWait1 = 6
+	nwmTCPStateFinWait2 = 7
+	nwmTCPStateClosWait = 8
+	nwmTCPStateLastAck  = 9
+	nwmTCPStateClosing  = 10
+	nwmTCPStateTimeWait = 11
+	nwmTCPStateDeletTCB = 12
+
+	// Existing constants on linux
+	BPF_TCP_CLOSE        = 1
+	BPF_TCP_LISTEN       = 2
+	BPF_TCP_SYN_SENT     = 3
+	BPF_TCP_SYN_RECV     = 4
+	BPF_TCP_ESTABLISHED  = 5
+	BPF_TCP_FIN_WAIT1    = 6
+	BPF_TCP_FIN_WAIT2    = 7
+	BPF_TCP_CLOSE_WAIT   = 8
+	BPF_TCP_LAST_ACK     = 9
+	BPF_TCP_CLOSING      = 10
+	BPF_TCP_TIME_WAIT    = 11
+	BPF_TCP_NEW_SYN_RECV = -1
+	BPF_TCP_MAX_STATES   = -2
+)
+
+type nwmTriplet struct {
+	offset uint32
+	length uint32
+	number uint32
+}
+
+type nwmQuadruplet struct {
+	offset uint32
+	length uint32
+	number uint32
+	match  uint32
+}
+
+type nwmHeader struct {
+	ident       uint32
+	length      uint32
+	version     uint16
+	nwmType     uint16
+	bytesNeeded uint32
+	options     uint32
+	_           [16]byte
+	inputDesc   nwmTriplet
+	outputDesc  nwmQuadruplet
+}
+
+type nwmFilter struct {
+	ident         uint32
+	flags         uint32
+	resourceName  [8]byte
+	resourceId    uint32
+	listenerId    uint32
+	local         [28]byte // union of sockaddr4 and sockaddr6
+	remote        [28]byte // union of sockaddr4 and sockaddr6
+	_             uint16
+	_             uint16
+	asid          uint16
+	_             [2]byte
+	tnLuName      [8]byte
+	tnMonGrp      uint32
+	tnAppl        [8]byte
+	applData      [40]byte
+	nInterface    [16]byte
+	dVipa         [16]byte
+	dVipaPfx      uint16
+	dVipaPort     uint16
+	dVipaFamily   byte
+	_             [3]byte
+	destXCF       [16]byte
+	destXCFPfx    uint16
+	destXCFFamily byte
+	_             [1]byte
+	targIP        [16]byte
+	targIPPfx     uint16
+	targIPFamily  byte
+	_             [1]byte
+	_             [20]byte
+}
+
+type nwmRecHeader struct {
+	ident  uint32
+	length uint32
+	number byte
+	_      [3]byte
+}
+
+type nwmTCPStatsEntry struct {
+	ident             uint64
+	currEstab         uint32
+	activeOpened      uint32
+	passiveOpened     uint32
+	connClosed        uint32
+	estabResets       uint32
+	attemptFails      uint32
+	passiveDrops      uint32
+	timeWaitReused    uint32
+	inSegs            uint64
+	predictAck        uint32
+	predictData       uint32
+	inDupAck          uint32
+	inBadSum          uint32
+	inBadLen          uint32
+	inShort           uint32
+	inDiscOldTime     uint32
+	inAllBeforeWin    uint32
+	inSomeBeforeWin   uint32
+	inAllAfterWin     uint32
+	inSomeAfterWin    uint32
+	inOutOfOrder      uint32
+	inAfterClose      uint32
+	inWinProbes       uint32
+	inWinUpdates      uint32
+	outWinUpdates     uint32
+	outSegs           uint64
+	outDelayAcks      uint32
+	outRsts           uint32
+	retransSegs       uint32
+	retransTimeouts   uint32
+	retransDrops      uint32
+	pmtuRetrans       uint32
+	pmtuErrors        uint32
+	outWinProbes      uint32
+	probeDrops        uint32
+	keepAliveProbes   uint32
+	keepAliveDrops    uint32
+	finwait2Drops     uint32
+	acceptCount       uint64
+	inBulkQSegs       uint64
+	inDiscards        uint64
+	connFloods        uint32
+	connStalls        uint32
+	cfgEphemDef       uint16
+	ephemInUse        uint16
+	ephemHiWater      uint16
+	flags             byte
+	_                 [1]byte
+	ephemExhaust      uint32
+	smcRCurrEstabLnks uint32
+	smcRLnkActTimeOut uint32
+	smcRActLnkOpened  uint32
+	smcRPasLnkOpened  uint32
+	smcRLnksClosed    uint32
+	smcRCurrEstab     uint32
+	smcRActiveOpened  uint32
+	smcRPassiveOpened uint32
+	smcRConnClosed    uint32
+	smcRInSegs        uint64
+	smcROutSegs       uint64
+	smcRInRsts        uint32
+	smcROutRsts       uint32
+	smcDCurrEstabLnks uint32
+	smcDActLnkOpened  uint32
+	smcDPasLnkOpened  uint32
+	smcDLnksClosed    uint32
+	smcDCurrEstab     uint32
+	smcDActiveOpened  uint32
+	smcDPassiveOpened uint32
+	smcDConnClosed    uint32
+	smcDInSegs        uint64
+	smcDOutSegs       uint64
+	smcDInRsts        uint32
+	smcDOutRsts       uint32
+}
+
+type nwmConnEntry struct {
+	ident             uint32
+	local             [28]byte // union of sockaddr4 and sockaddr6
+	remote            [28]byte // union of sockaddr4 and sockaddr6
+	startTime         [8]byte  // uint64, changed to prevent padding from being inserted
+	lastActivity      [8]byte  // uint64
+	bytesIn           [8]byte  // uint64
+	bytesOut          [8]byte  // uint64
+	inSegs            [8]byte  // uint64
+	outSegs           [8]byte  // uint64
+	state             uint16
+	activeOpen        byte
+	flag01            byte
+	outBuffered       uint32
+	inBuffered        uint32
+	maxSndWnd         uint32
+	reXmtCount        uint32
+	congestionWnd     uint32
+	ssThresh          uint32
+	roundTripTime     uint32
+	roundTripVar      uint32
+	sendMSS           uint32
+	sndWnd            uint32
+	rcvBufSize        uint32
+	sndBufSize        uint32
+	outOfOrderCount   uint32
+	lcl0WindowCount   uint32
+	rmt0WindowCount   uint32
+	dupacks           uint32
+	flag02            byte
+	sockOpt6Cont      byte
+	asid              uint16
+	resourceName      [8]byte
+	resourceId        uint32
+	subtask           uint32
+	sockOpt           byte
+	sockOpt6          byte
+	clusterConnFlag   byte
+	proto             byte
+	targetAppl        [8]byte
+	luName            [8]byte
+	clientUserId      [8]byte
+	logMode           [8]byte
+	timeStamp         uint32
+	timeStampAge      uint32
+	serverResourceId  uint32
+	intfName          [16]byte
+	ttlsStatPol       byte
+	ttlsStatConn      byte
+	ttlsSSLProt       uint16
+	ttlsNegCiph       [2]byte
+	ttlsSecType       byte
+	ttlsFIPS140Mode   byte
+	ttlsUserID        [8]byte
+	applData          [40]byte
+	inOldestTime      [8]byte // uint64
+	outOldestTime     [8]byte // uint64
+	tcpTrustedPartner byte
+	_                 [3]byte
+	bulkDataIntfName  [16]byte
+	ttlsNegCiph4      [4]byte
+	smcReason         uint32
+	lclSMCLinkId      uint32
+	rmtSMCLinkId      uint32
+	smcStatus         byte
+	smcFlags          byte
+	_                 [2]byte
+	rcvWnd            uint32
+	lclSMCBufSz       uint32
+	rmtSMCBufSz       uint32
+	ttlsSessID        [32]byte
+	ttlsSessIDLen     int16
+	_                 [1]byte
+	smcDStatus        byte
+	smcDReason        uint32
+}
+
+var svcNameTable [][]byte = [][]byte{
+	[]byte("\xc5\xe9\xc2\xd5\xd4\xc9\xc6\xf4"), // svc_EZBNMIF4
+}
+
+const (
+	svc_EZBNMIF4 = 0
+)
+
+func GetsockoptTCPInfo(fd, level, opt int) (*TCPInfo, error) {
+	jobname := []byte("\x5c\x40\x40\x40\x40\x40\x40\x40") // "*"
+	responseBuffer := [4096]byte{0}
+	var bufferAlet, reasonCode uint32 = 0, 0
+	var bufferLen, returnValue, returnCode int32 = 4096, 0, 0
+
+	dsa := [18]uint64{0}
+	var argv [7]unsafe.Pointer
+	argv[0] = unsafe.Pointer(&jobname[0])
+	argv[1] = unsafe.Pointer(&responseBuffer[0])
+	argv[2] = unsafe.Pointer(&bufferAlet)
+	argv[3] = unsafe.Pointer(&bufferLen)
+	argv[4] = unsafe.Pointer(&returnValue)
+	argv[5] = unsafe.Pointer(&returnCode)
+	argv[6] = unsafe.Pointer(&reasonCode)
+
+	request := (*struct {
+		header nwmHeader
+		filter nwmFilter
+	})(unsafe.Pointer(&responseBuffer[0]))
+
+	EZBNMIF4 := svcLoad(&svcNameTable[svc_EZBNMIF4][0])
+	if EZBNMIF4 == nil {
+		return nil, errnoErr(EINVAL)
+	}
+
+	// GetGlobalStats EZBNMIF4 call
+	request.header.ident = nwmHeaderIdentifier
+	request.header.length = uint32(unsafe.Sizeof(request.header))
+	request.header.version = nwmCurrentVer
+	request.header.nwmType = nwmGlobalStatsType
+	request.header.options = 0x80000000
+
+	svcCall(EZBNMIF4, &argv[0], &dsa[0])
+
+	// outputDesc field is filled by EZBNMIF4 on success
+	if returnCode != 0 || request.header.outputDesc.offset == 0 {
+		return nil, errnoErr(EINVAL)
+	}
+
+	// Check that EZBNMIF4 returned a nwmRecHeader
+	recHeader := (*nwmRecHeader)(unsafe.Pointer(&responseBuffer[request.header.outputDesc.offset]))
+	if recHeader.ident != nwmRecHeaderIdentifier {
+		return nil, errnoErr(EINVAL)
+	}
+
+	// Parse nwmTriplets to get offsets of returned entries
+	var sections []*uint64
+	var sectionDesc *nwmTriplet = (*nwmTriplet)(unsafe.Pointer(&responseBuffer[0]))
+	for i := uint32(0); i < uint32(recHeader.number); i++ {
+		offset := request.header.outputDesc.offset + uint32(unsafe.Sizeof(*recHeader)) + i*uint32(unsafe.Sizeof(*sectionDesc))
+		sectionDesc = (*nwmTriplet)(unsafe.Pointer(&responseBuffer[offset]))
+		for j := uint32(0); j < sectionDesc.number; j++ {
+			offset = request.header.outputDesc.offset + sectionDesc.offset + j*sectionDesc.length
+			sections = append(sections, (*uint64)(unsafe.Pointer(&responseBuffer[offset])))
+		}
+	}
+
+	// Find nwmTCPStatsEntry in returned entries
+	var tcpStats *nwmTCPStatsEntry = nil
+	for _, ptr := range sections {
+		switch *ptr {
+		case nwmTCPStatsIdentifier:
+			if tcpStats != nil {
+				return nil, errnoErr(EINVAL)
+			}
+			tcpStats = (*nwmTCPStatsEntry)(unsafe.Pointer(ptr))
+		case nwmIPStatsIdentifier:
+		case nwmIPGStatsIdentifier:
+		case nwmUDPStatsIdentifier:
+		case nwmICMPGStatsEntry:
+		case nwmICMPTStatsEntry:
+		default:
+			return nil, errnoErr(EINVAL)
+		}
+	}
+	if tcpStats == nil {
+		return nil, errnoErr(EINVAL)
+	}
+
+	// GetConnectionDetail EZBNMIF4 call
+	responseBuffer = [4096]byte{0}
+	dsa = [18]uint64{0}
+	bufferAlet, reasonCode = 0, 0
+	bufferLen, returnValue, returnCode = 4096, 0, 0
+	nameptr := (*uint32)(unsafe.Pointer(uintptr(0x21c))) // Get jobname of current process
+	nameptr = (*uint32)(unsafe.Pointer(uintptr(*nameptr + 12)))
+	argv[0] = unsafe.Pointer(uintptr(*nameptr))
+
+	request.header.ident = nwmHeaderIdentifier
+	request.header.length = uint32(unsafe.Sizeof(request.header))
+	request.header.version = nwmCurrentVer
+	request.header.nwmType = nwmTCPConnType
+	request.header.options = 0x80000000
+
+	request.filter.ident = nwmFilterIdentifier
+
+	var localSockaddr RawSockaddrAny
+	socklen := _Socklen(SizeofSockaddrAny)
+	err := getsockname(fd, &localSockaddr, &socklen)
+	if err != nil {
+		return nil, errnoErr(EINVAL)
+	}
+	if localSockaddr.Addr.Family == AF_INET {
+		localSockaddr := (*RawSockaddrInet4)(unsafe.Pointer(&localSockaddr.Addr))
+		localSockFilter := (*RawSockaddrInet4)(unsafe.Pointer(&request.filter.local[0]))
+		localSockFilter.Family = AF_INET
+		var i int
+		for i = 0; i < 4; i++ {
+			if localSockaddr.Addr[i] != 0 {
+				break
+			}
+		}
+		if i != 4 {
+			request.filter.flags |= nwmFilterLclAddrMask
+			for i = 0; i < 4; i++ {
+				localSockFilter.Addr[i] = localSockaddr.Addr[i]
+			}
+		}
+		if localSockaddr.Port != 0 {
+			request.filter.flags |= nwmFilterLclPortMask
+			localSockFilter.Port = localSockaddr.Port
+		}
+	} else if localSockaddr.Addr.Family == AF_INET6 {
+		localSockaddr := (*RawSockaddrInet6)(unsafe.Pointer(&localSockaddr.Addr))
+		localSockFilter := (*RawSockaddrInet6)(unsafe.Pointer(&request.filter.local[0]))
+		localSockFilter.Family = AF_INET6
+		var i int
+		for i = 0; i < 16; i++ {
+			if localSockaddr.Addr[i] != 0 {
+				break
+			}
+		}
+		if i != 16 {
+			request.filter.flags |= nwmFilterLclAddrMask
+			for i = 0; i < 16; i++ {
+				localSockFilter.Addr[i] = localSockaddr.Addr[i]
+			}
+		}
+		if localSockaddr.Port != 0 {
+			request.filter.flags |= nwmFilterLclPortMask
+			localSockFilter.Port = localSockaddr.Port
+		}
+	}
+
+	svcCall(EZBNMIF4, &argv[0], &dsa[0])
+
+	// outputDesc field is filled by EZBNMIF4 on success
+	if returnCode != 0 || request.header.outputDesc.offset == 0 {
+		return nil, errnoErr(EINVAL)
+	}
+
+	// Check that EZBNMIF4 returned a nwmConnEntry
+	conn := (*nwmConnEntry)(unsafe.Pointer(&responseBuffer[request.header.outputDesc.offset]))
+	if conn.ident != nwmTCPConnIdentifier {
+		return nil, errnoErr(EINVAL)
+	}
+
+	// Copy data from the returned data structures into tcpInfo
+	// Stats from nwmConnEntry are specific to that connection.
+	// Stats from nwmTCPStatsEntry are global (to the interface?)
+	// Fields may not be an exact match. Some fields have no equivalent.
+	var tcpinfo TCPInfo
+	tcpinfo.State = uint8(conn.state)
+	tcpinfo.Ca_state = 0 // dummy
+	tcpinfo.Retransmits = uint8(tcpStats.retransSegs)
+	tcpinfo.Probes = uint8(tcpStats.outWinProbes)
+	tcpinfo.Backoff = 0 // dummy
+	tcpinfo.Options = 0 // dummy
+	tcpinfo.Rto = tcpStats.retransTimeouts
+	tcpinfo.Ato = tcpStats.outDelayAcks
+	tcpinfo.Snd_mss = conn.sendMSS
+	tcpinfo.Rcv_mss = conn.sendMSS // dummy
+	tcpinfo.Unacked = 0            // dummy
+	tcpinfo.Sacked = 0             // dummy
+	tcpinfo.Lost = 0               // dummy
+	tcpinfo.Retrans = conn.reXmtCount
+	tcpinfo.Fackets = 0 // dummy
+	tcpinfo.Last_data_sent = uint32(*(*uint64)(unsafe.Pointer(&conn.lastActivity[0])))
+	tcpinfo.Last_ack_sent = uint32(*(*uint64)(unsafe.Pointer(&conn.outOldestTime[0])))
+	tcpinfo.Last_data_recv = uint32(*(*uint64)(unsafe.Pointer(&conn.inOldestTime[0])))
+	tcpinfo.Last_ack_recv = uint32(*(*uint64)(unsafe.Pointer(&conn.inOldestTime[0])))
+	tcpinfo.Pmtu = conn.sendMSS // dummy, NWMIfRouteMtu is a candidate
+	tcpinfo.Rcv_ssthresh = conn.ssThresh
+	tcpinfo.Rtt = conn.roundTripTime
+	tcpinfo.Rttvar = conn.roundTripVar
+	tcpinfo.Snd_ssthresh = conn.ssThresh // dummy
+	tcpinfo.Snd_cwnd = conn.congestionWnd
+	tcpinfo.Advmss = conn.sendMSS        // dummy
+	tcpinfo.Reordering = 0               // dummy
+	tcpinfo.Rcv_rtt = conn.roundTripTime // dummy
+	tcpinfo.Rcv_space = conn.sendMSS     // dummy
+	tcpinfo.Total_retrans = conn.reXmtCount
+
+	svcUnload(&svcNameTable[svc_EZBNMIF4][0], EZBNMIF4)
+
+	return &tcpinfo, nil
+}
+
+// GetsockoptString returns the string value of the socket option opt for the
+// socket associated with fd at the given socket level.
+func GetsockoptString(fd, level, opt int) (string, error) {
+	buf := make([]byte, 256)
+	vallen := _Socklen(len(buf))
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
+	if err != nil {
+		return "", err
+	}
+
+	return ByteSliceToString(buf[:vallen]), nil
+}
+
+func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
+	var msg Msghdr
+	var rsa RawSockaddrAny
+	msg.Name = (*byte)(unsafe.Pointer(&rsa))
+	msg.Namelen = SizeofSockaddrAny
+	var iov Iovec
+	if len(p) > 0 {
+		iov.Base = (*byte)(unsafe.Pointer(&p[0]))
+		iov.SetLen(len(p))
+	}
+	var dummy byte
+	if len(oob) > 0 {
+		// receive at least one normal byte
+		if len(p) == 0 {
+			iov.Base = &dummy
+			iov.SetLen(1)
+		}
+		msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
+		msg.SetControllen(len(oob))
+	}
+	msg.Iov = &iov
+	msg.Iovlen = 1
+	if n, err = recvmsg(fd, &msg, flags); err != nil {
+		return
+	}
+	oobn = int(msg.Controllen)
+	recvflags = int(msg.Flags)
+	// source address is only specified if the socket is unconnected
+	if rsa.Addr.Family != AF_UNSPEC {
+		// TODO(neeilan): Remove 0 arg added to get this compiling on z/OS
+		from, err = anyToSockaddr(0, &rsa)
+	}
+	return
+}
+
+func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
+	_, err = SendmsgN(fd, p, oob, to, flags)
+	return
+}
+
+func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
+	var ptr unsafe.Pointer
+	var salen _Socklen
+	if to != nil {
+		var err error
+		ptr, salen, err = to.sockaddr()
+		if err != nil {
+			return 0, err
+		}
+	}
+	var msg Msghdr
+	msg.Name = (*byte)(unsafe.Pointer(ptr))
+	msg.Namelen = int32(salen)
+	var iov Iovec
+	if len(p) > 0 {
+		iov.Base = (*byte)(unsafe.Pointer(&p[0]))
+		iov.SetLen(len(p))
+	}
+	var dummy byte
+	if len(oob) > 0 {
+		// send at least one normal byte
+		if len(p) == 0 {
+			iov.Base = &dummy
+			iov.SetLen(1)
+		}
+		msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
+		msg.SetControllen(len(oob))
+	}
+	msg.Iov = &iov
+	msg.Iovlen = 1
+	if n, err = sendmsg(fd, &msg, flags); err != nil {
+		return 0, err
+	}
+	if len(oob) > 0 && len(p) == 0 {
+		n = 0
+	}
+	return n, nil
+}
+
+func Opendir(name string) (uintptr, error) {
+	p, err := BytePtrFromString(name)
+	if err != nil {
+		return 0, err
+	}
+	err = nil
+	runtime.EnterSyscall()
+	dir, e2, e1 := CallLeFuncWithPtrReturn(GetZosLibVec()+SYS___OPENDIR_A<<4, uintptr(unsafe.Pointer(p)))
+	runtime.ExitSyscall()
+	runtime.KeepAlive(unsafe.Pointer(p))
+	if dir == 0 {
+		err = errnoErr2(e1, e2)
+	}
+	return dir, err
+}
+
+// clearsyscall.Errno resets the errno value to 0.
+func clearErrno()
+
+func Closedir(dir uintptr) error {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_CLOSEDIR<<4, dir)
+	runtime.ExitSyscall()
+	if r0 != 0 {
+		return errnoErr2(e1, e2)
+	}
+	return nil
+}
+
+func Seekdir(dir uintptr, pos int) {
+	runtime.EnterSyscall()
+	CallLeFuncWithErr(GetZosLibVec()+SYS_SEEKDIR<<4, dir, uintptr(pos))
+	runtime.ExitSyscall()
+}
+
+func Telldir(dir uintptr) (int, error) {
+	p, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_TELLDIR<<4, dir)
+	pos := int(p)
+	if int64(p) == -1 {
+		return pos, errnoErr2(e1, e2)
+	}
+	return pos, nil
+}
+
+// FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
+func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
+	// struct flock is packed on z/OS. We can't emulate that in Go so
+	// instead we pack it here.
+	var flock [24]byte
+	*(*int16)(unsafe.Pointer(&flock[0])) = lk.Type
+	*(*int16)(unsafe.Pointer(&flock[2])) = lk.Whence
+	*(*int64)(unsafe.Pointer(&flock[4])) = lk.Start
+	*(*int64)(unsafe.Pointer(&flock[12])) = lk.Len
+	*(*int32)(unsafe.Pointer(&flock[20])) = lk.Pid
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_FCNTL<<4, fd, uintptr(cmd), uintptr(unsafe.Pointer(&flock)))
+	runtime.ExitSyscall()
+	lk.Type = *(*int16)(unsafe.Pointer(&flock[0]))
+	lk.Whence = *(*int16)(unsafe.Pointer(&flock[2]))
+	lk.Start = *(*int64)(unsafe.Pointer(&flock[4]))
+	lk.Len = *(*int64)(unsafe.Pointer(&flock[12]))
+	lk.Pid = *(*int32)(unsafe.Pointer(&flock[20]))
+	if r0 == 0 {
+		return nil
+	}
+	return errnoErr2(e1, e2)
+}
+
+func impl_Flock(fd int, how int) (err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_FLOCK<<4, uintptr(fd), uintptr(how))
+	runtime.ExitSyscall()
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+//go:nosplit
+func get_FlockAddr() *(func(fd int, how int) (err error))
+
+var Flock = enter_Flock
+
+func validFlock(fp uintptr) bool {
+	if funcptrtest(GetZosLibVec()+SYS_FLOCK<<4, "") == 0 {
+		if name, err := getLeFuncName(GetZosLibVec() + SYS_FLOCK<<4); err == nil {
+			return name == "flock"
+		}
+	}
+	return false
+}
+
+func enter_Flock(fd int, how int) (err error) {
+	funcref := get_FlockAddr()
+	if validFlock(GetZosLibVec() + SYS_FLOCK<<4) {
+		*funcref = impl_Flock
+	} else {
+		*funcref = legacyFlock
+	}
+	return (*funcref)(fd, how)
+}
+
+func legacyFlock(fd int, how int) error {
+
+	var flock_type int16
+	var fcntl_cmd int
+
+	switch how {
+	case LOCK_SH | LOCK_NB:
+		flock_type = F_RDLCK
+		fcntl_cmd = F_SETLK
+	case LOCK_EX | LOCK_NB:
+		flock_type = F_WRLCK
+		fcntl_cmd = F_SETLK
+	case LOCK_EX:
+		flock_type = F_WRLCK
+		fcntl_cmd = F_SETLKW
+	case LOCK_UN:
+		flock_type = F_UNLCK
+		fcntl_cmd = F_SETLKW
+	default:
+	}
+
+	flock := Flock_t{
+		Type:   int16(flock_type),
+		Whence: int16(0),
+		Start:  int64(0),
+		Len:    int64(0),
+		Pid:    int32(Getppid()),
+	}
+
+	err := FcntlFlock(uintptr(fd), fcntl_cmd, &flock)
+	return err
+}
+
+func Mlock(b []byte) (err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___MLOCKALL<<4, _BPX_NONSWAP)
+	runtime.ExitSyscall()
+	if r0 != 0 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+func Mlock2(b []byte, flags int) (err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___MLOCKALL<<4, _BPX_NONSWAP)
+	runtime.ExitSyscall()
+	if r0 != 0 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+func Mlockall(flags int) (err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___MLOCKALL<<4, _BPX_NONSWAP)
+	runtime.ExitSyscall()
+	if r0 != 0 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+func Munlock(b []byte) (err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___MLOCKALL<<4, _BPX_SWAP)
+	runtime.ExitSyscall()
+	if r0 != 0 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+func Munlockall() (err error) {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___MLOCKALL<<4, _BPX_SWAP)
+	runtime.ExitSyscall()
+	if r0 != 0 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+func ClockGettime(clockid int32, ts *Timespec) error {
+
+	var ticks_per_sec uint32 = 100 //TODO(kenan): value is currently hardcoded; need sysconf() call otherwise
+	var nsec_per_sec int64 = 1000000000
+
+	if ts == nil {
+		return EFAULT
+	}
+	if clockid == CLOCK_REALTIME || clockid == CLOCK_MONOTONIC {
+		var nanotime int64 = runtime.Nanotime1()
+		ts.Sec = nanotime / nsec_per_sec
+		ts.Nsec = nanotime % nsec_per_sec
+	} else if clockid == CLOCK_PROCESS_CPUTIME_ID || clockid == CLOCK_THREAD_CPUTIME_ID {
+		var tm Tms
+		_, err := Times(&tm)
+		if err != nil {
+			return EFAULT
+		}
+		ts.Sec = int64(tm.Utime / ticks_per_sec)
+		ts.Nsec = int64(tm.Utime) * nsec_per_sec / int64(ticks_per_sec)
+	} else {
+		return EINVAL
+	}
+	return nil
+}
+
+// Chtag
+
+//go:nosplit
+func get_ChtagAddr() *(func(path string, ccsid uint64, textbit uint64) error)
+
+var Chtag = enter_Chtag
+
+func enter_Chtag(path string, ccsid uint64, textbit uint64) error {
+	funcref := get_ChtagAddr()
+	if validSetxattr() {
+		*funcref = impl_Chtag
+	} else {
+		*funcref = legacy_Chtag
+	}
+	return (*funcref)(path, ccsid, textbit)
+}
+
+func legacy_Chtag(path string, ccsid uint64, textbit uint64) error {
+	tag := ccsid<<16 | textbit<<15
+	var tag_buff [8]byte
+	DecodeData(tag_buff[:], 8, tag)
+	return Setxattr(path, "filetag", tag_buff[:], XATTR_REPLACE)
+}
+
+func impl_Chtag(path string, ccsid uint64, textbit uint64) error {
+	tag := ccsid<<16 | textbit<<15
+	var tag_buff [4]byte
+	DecodeData(tag_buff[:], 4, tag)
+	return Setxattr(path, "system.filetag", tag_buff[:], XATTR_REPLACE)
+}
+
+// End of Chtag
+
+// Nanosleep
+
+//go:nosplit
+func get_NanosleepAddr() *(func(time *Timespec, leftover *Timespec) error)
+
+var Nanosleep = enter_Nanosleep
+
+func enter_Nanosleep(time *Timespec, leftover *Timespec) error {
+	funcref := get_NanosleepAddr()
+	if funcptrtest(GetZosLibVec()+SYS_NANOSLEEP<<4, "") == 0 {
+		*funcref = impl_Nanosleep
+	} else {
+		*funcref = legacyNanosleep
+	}
+	return (*funcref)(time, leftover)
+}
+
+func impl_Nanosleep(time *Timespec, leftover *Timespec) error {
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS_NANOSLEEP<<4, uintptr(unsafe.Pointer(time)), uintptr(unsafe.Pointer(leftover)))
+	runtime.ExitSyscall()
+	if int64(r0) == -1 {
+		return errnoErr2(e1, e2)
+	}
+	return nil
+}
+
+func legacyNanosleep(time *Timespec, leftover *Timespec) error {
+	t0 := runtime.Nanotime1()
+	var secrem uint32
+	var nsecrem uint32
+	total := time.Sec*1000000000 + time.Nsec
+	elapsed := runtime.Nanotime1() - t0
+	var rv int32
+	var rc int32
+	var err error
+	// repeatedly sleep for 1 second until less than 1 second left
+	for total-elapsed > 1000000000 {
+		rv, rc, _ = BpxCondTimedWait(uint32(1), uint32(0), uint32(CW_CONDVAR), &secrem, &nsecrem)
+		if rv != 0 && rc != 112 { // 112 is EAGAIN
+			if leftover != nil && rc == 120 { // 120 is EINTR
+				leftover.Sec = int64(secrem)
+				leftover.Nsec = int64(nsecrem)
+			}
+			err = Errno(rc)
+			return err
+		}
+		elapsed = runtime.Nanotime1() - t0
+	}
+	// sleep the remainder
+	if total > elapsed {
+		rv, rc, _ = BpxCondTimedWait(uint32(0), uint32(total-elapsed), uint32(CW_CONDVAR), &secrem, &nsecrem)
+	}
+	if leftover != nil && rc == 120 {
+		leftover.Sec = int64(secrem)
+		leftover.Nsec = int64(nsecrem)
+	}
+	if rv != 0 && rc != 112 {
+		err = Errno(rc)
+	}
+	return err
+}
+
+// End of Nanosleep
+
+var (
+	Stdin  = 0
+	Stdout = 1
+	Stderr = 2
+)
+
+// Do the interface allocations only once for common
+// Errno values.
+var (
+	errEAGAIN error = syscall.EAGAIN
+	errEINVAL error = syscall.EINVAL
+	errENOENT error = syscall.ENOENT
+)
+
+var ZosTraceLevel int
+var ZosTracefile *os.File
+
+var (
+	signalNameMapOnce sync.Once
+	signalNameMap     map[string]syscall.Signal
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e Errno) error {
+	switch e {
+	case 0:
+		return nil
+	case EAGAIN:
+		return errEAGAIN
+	case EINVAL:
+		return errEINVAL
+	case ENOENT:
+		return errENOENT
+	}
+	return e
+}
+
+var reg *regexp.Regexp
+
+// enhanced with zos specific errno2
+func errnoErr2(e Errno, e2 uintptr) error {
+	switch e {
+	case 0:
+		return nil
+	case EAGAIN:
+		return errEAGAIN
+		/*
+			Allow the retrieval of errno2 for EINVAL and ENOENT on zos
+				case EINVAL:
+					return errEINVAL
+				case ENOENT:
+					return errENOENT
+		*/
+	}
+	if ZosTraceLevel > 0 {
+		var name string
+		if reg == nil {
+			reg = regexp.MustCompile("(^unix\\.[^/]+$|.*\\/unix\\.[^/]+$)")
+		}
+		i := 1
+		pc, file, line, ok := runtime.Caller(i)
+		if ok {
+			name = runtime.FuncForPC(pc).Name()
+		}
+		for ok && reg.MatchString(runtime.FuncForPC(pc).Name()) {
+			i += 1
+			pc, file, line, ok = runtime.Caller(i)
+		}
+		if ok {
+			if ZosTracefile == nil {
+				ZosConsolePrintf("From %s:%d\n", file, line)
+				ZosConsolePrintf("%s: %s (errno2=0x%x)\n", name, e.Error(), e2)
+			} else {
+				fmt.Fprintf(ZosTracefile, "From %s:%d\n", file, line)
+				fmt.Fprintf(ZosTracefile, "%s: %s (errno2=0x%x)\n", name, e.Error(), e2)
+			}
+		} else {
+			if ZosTracefile == nil {
+				ZosConsolePrintf("%s (errno2=0x%x)\n", e.Error(), e2)
+			} else {
+				fmt.Fprintf(ZosTracefile, "%s (errno2=0x%x)\n", e.Error(), e2)
+			}
+		}
+	}
+	return e
+}
+
+// ErrnoName returns the error name for error number e.
+func ErrnoName(e Errno) string {
+	i := sort.Search(len(errorList), func(i int) bool {
+		return errorList[i].num >= e
+	})
+	if i < len(errorList) && errorList[i].num == e {
+		return errorList[i].name
+	}
+	return ""
+}
+
+// SignalName returns the signal name for signal number s.
+func SignalName(s syscall.Signal) string {
+	i := sort.Search(len(signalList), func(i int) bool {
+		return signalList[i].num >= s
+	})
+	if i < len(signalList) && signalList[i].num == s {
+		return signalList[i].name
+	}
+	return ""
+}
+
+// SignalNum returns the syscall.Signal for signal named s,
+// or 0 if a signal with such name is not found.
+// The signal name should start with "SIG".
+func SignalNum(s string) syscall.Signal {
+	signalNameMapOnce.Do(func() {
+		signalNameMap = make(map[string]syscall.Signal, len(signalList))
+		for _, signal := range signalList {
+			signalNameMap[signal.name] = signal.num
+		}
+	})
+	return signalNameMap[s]
+}
+
+// clen returns the index of the first NULL byte in n or len(n) if n contains no NULL byte.
+func clen(n []byte) int {
+	i := bytes.IndexByte(n, 0)
+	if i == -1 {
+		i = len(n)
+	}
+	return i
+}
+
+// Mmap manager, for use by operating system-specific implementations.
+
+type mmapper struct {
+	sync.Mutex
+	active map[*byte][]byte // active mappings; key is last byte in mapping
+	mmap   func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
+	munmap func(addr uintptr, length uintptr) error
+}
+
+func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
+	if length <= 0 {
+		return nil, EINVAL
+	}
+
+	// Set __MAP_64 by default
+	flags |= __MAP_64
+
+	// Map the requested memory.
+	addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset)
+	if errno != nil {
+		return nil, errno
+	}
+
+	// Slice memory layout
+	var sl = struct {
+		addr uintptr
+		len  int
+		cap  int
+	}{addr, length, length}
+
+	// Use unsafe to turn sl into a []byte.
+	b := *(*[]byte)(unsafe.Pointer(&sl))
+
+	// Register mapping in m and return it.
+	p := &b[cap(b)-1]
+	m.Lock()
+	defer m.Unlock()
+	m.active[p] = b
+	return b, nil
+}
+
+func (m *mmapper) Munmap(data []byte) (err error) {
+	if len(data) == 0 || len(data) != cap(data) {
+		return EINVAL
+	}
+
+	// Find the base of the mapping.
+	p := &data[cap(data)-1]
+	m.Lock()
+	defer m.Unlock()
+	b := m.active[p]
+	if b == nil || &b[0] != &data[0] {
+		return EINVAL
+	}
+
+	// Unmap the memory and update m.
+	if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil {
+		return errno
+	}
+	delete(m.active, p)
+	return nil
+}
+
+func Read(fd int, p []byte) (n int, err error) {
+	n, err = read(fd, p)
+	if raceenabled {
+		if n > 0 {
+			raceWriteRange(unsafe.Pointer(&p[0]), n)
+		}
+		if err == nil {
+			raceAcquire(unsafe.Pointer(&ioSync))
+		}
+	}
+	return
+}
+
+func Write(fd int, p []byte) (n int, err error) {
+	if raceenabled {
+		raceReleaseMerge(unsafe.Pointer(&ioSync))
+	}
+	n, err = write(fd, p)
+	if raceenabled && n > 0 {
+		raceReadRange(unsafe.Pointer(&p[0]), n)
+	}
+	return
+}
+
+// For testing: clients can set this flag to force
+// creation of IPv6 sockets to return EAFNOSUPPORT.
+var SocketDisableIPv6 bool
+
+// Sockaddr represents a socket address.
+type Sockaddr interface {
+	sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs
+}
+
+// SockaddrInet4 implements the Sockaddr interface for AF_INET type sockets.
+type SockaddrInet4 struct {
+	Port int
+	Addr [4]byte
+	raw  RawSockaddrInet4
+}
+
+// SockaddrInet6 implements the Sockaddr interface for AF_INET6 type sockets.
+type SockaddrInet6 struct {
+	Port   int
+	ZoneId uint32
+	Addr   [16]byte
+	raw    RawSockaddrInet6
+}
+
+// SockaddrUnix implements the Sockaddr interface for AF_UNIX type sockets.
+type SockaddrUnix struct {
+	Name string
+	raw  RawSockaddrUnix
+}
+
+func Bind(fd int, sa Sockaddr) (err error) {
+	ptr, n, err := sa.sockaddr()
+	if err != nil {
+		return err
+	}
+	return bind(fd, ptr, n)
+}
+
+func Connect(fd int, sa Sockaddr) (err error) {
+	ptr, n, err := sa.sockaddr()
+	if err != nil {
+		return err
+	}
+	return connect(fd, ptr, n)
+}
+
+func Getpeername(fd int) (sa Sockaddr, err error) {
+	var rsa RawSockaddrAny
+	var len _Socklen = SizeofSockaddrAny
+	if err = getpeername(fd, &rsa, &len); err != nil {
+		return
+	}
+	return anyToSockaddr(fd, &rsa)
+}
+
+func GetsockoptByte(fd, level, opt int) (value byte, err error) {
+	var n byte
+	vallen := _Socklen(1)
+	err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
+	return n, err
+}
+
+func GetsockoptInt(fd, level, opt int) (value int, err error) {
+	var n int32
+	vallen := _Socklen(4)
+	err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
+	return int(n), err
+}
+
+func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) {
+	vallen := _Socklen(4)
+	err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen)
+	return value, err
+}
+
+func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) {
+	var value IPMreq
+	vallen := _Socklen(SizeofIPMreq)
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
+	return &value, err
+}
+
+func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) {
+	var value IPv6Mreq
+	vallen := _Socklen(SizeofIPv6Mreq)
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
+	return &value, err
+}
+
+func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) {
+	var value IPv6MTUInfo
+	vallen := _Socklen(SizeofIPv6MTUInfo)
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
+	return &value, err
+}
+
+func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) {
+	var value ICMPv6Filter
+	vallen := _Socklen(SizeofICMPv6Filter)
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
+	return &value, err
+}
+
+func GetsockoptLinger(fd, level, opt int) (*Linger, error) {
+	var linger Linger
+	vallen := _Socklen(SizeofLinger)
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&linger), &vallen)
+	return &linger, err
+}
+
+func GetsockoptTimeval(fd, level, opt int) (*Timeval, error) {
+	var tv Timeval
+	vallen := _Socklen(unsafe.Sizeof(tv))
+	err := getsockopt(fd, level, opt, unsafe.Pointer(&tv), &vallen)
+	return &tv, err
+}
+
+func GetsockoptUint64(fd, level, opt int) (value uint64, err error) {
+	var n uint64
+	vallen := _Socklen(8)
+	err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
+	return n, err
+}
+
+func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
+	var rsa RawSockaddrAny
+	var len _Socklen = SizeofSockaddrAny
+	if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
+		return
+	}
+	if rsa.Addr.Family != AF_UNSPEC {
+		from, err = anyToSockaddr(fd, &rsa)
+	}
+	return
+}
+
+func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
+	ptr, n, err := to.sockaddr()
+	if err != nil {
+		return err
+	}
+	return sendto(fd, p, flags, ptr, n)
+}
+
+func SetsockoptByte(fd, level, opt int, value byte) (err error) {
+	return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
+}
+
+func SetsockoptInt(fd, level, opt int, value int) (err error) {
+	var n = int32(value)
+	return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
+}
+
+func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
+	return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4)
+}
+
+func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
+	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq)
+}
+
+func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
+	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq)
+}
+
+func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error {
+	return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter)
+}
+
+func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
+	return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger)
+}
+
+func SetsockoptString(fd, level, opt int, s string) (err error) {
+	var p unsafe.Pointer
+	if len(s) > 0 {
+		p = unsafe.Pointer(&[]byte(s)[0])
+	}
+	return setsockopt(fd, level, opt, p, uintptr(len(s)))
+}
+
+func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
+	return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv))
+}
+
+func SetsockoptUint64(fd, level, opt int, value uint64) (err error) {
+	return setsockopt(fd, level, opt, unsafe.Pointer(&value), 8)
+}
+
+func Socket(domain, typ, proto int) (fd int, err error) {
+	if domain == AF_INET6 && SocketDisableIPv6 {
+		return -1, EAFNOSUPPORT
+	}
+	fd, err = socket(domain, typ, proto)
+	return
+}
+
+func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
+	var fdx [2]int32
+	err = socketpair(domain, typ, proto, &fdx)
+	if err == nil {
+		fd[0] = int(fdx[0])
+		fd[1] = int(fdx[1])
+	}
+	return
+}
+
+var ioSync int64
+
+func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }
+
+func SetNonblock(fd int, nonblocking bool) (err error) {
+	flag, err := fcntl(fd, F_GETFL, 0)
+	if err != nil {
+		return err
+	}
+	if nonblocking {
+		flag |= O_NONBLOCK
+	} else {
+		flag &= ^O_NONBLOCK
+	}
+	_, err = fcntl(fd, F_SETFL, flag)
+	return err
+}
+
+// Exec calls execve(2), which replaces the calling executable in the process
+// tree. argv0 should be the full path to an executable ("/bin/ls") and the
+// executable name should also be the first argument in argv (["ls", "-l"]).
+// envv are the environment variables that should be passed to the new
+// process (["USER=go", "PWD=/tmp"]).
+func Exec(argv0 string, argv []string, envv []string) error {
+	return syscall.Exec(argv0, argv, envv)
+}
+
+func Getag(path string) (ccsid uint16, flag uint16, err error) {
+	var val [8]byte
+	sz, err := Getxattr(path, "ccsid", val[:])
+	if err != nil {
+		return
+	}
+	ccsid = uint16(EncodeData(val[0:sz]))
+	sz, err = Getxattr(path, "flags", val[:])
+	if err != nil {
+		return
+	}
+	flag = uint16(EncodeData(val[0:sz]) >> 15)
+	return
+}
+
+// Mount begin
+func impl_Mount(source string, target string, fstype string, flags uintptr, data string) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(source)
+	if err != nil {
+		return
+	}
+	var _p1 *byte
+	_p1, err = BytePtrFromString(target)
+	if err != nil {
+		return
+	}
+	var _p2 *byte
+	_p2, err = BytePtrFromString(fstype)
+	if err != nil {
+		return
+	}
+	var _p3 *byte
+	_p3, err = BytePtrFromString(data)
+	if err != nil {
+		return
+	}
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___MOUNT1_A<<4, uintptr(unsafe.Pointer(_p0)), uintptr(unsafe.Pointer(_p1)), uintptr(unsafe.Pointer(_p2)), uintptr(flags), uintptr(unsafe.Pointer(_p3)))
+	runtime.ExitSyscall()
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+//go:nosplit
+func get_MountAddr() *(func(source string, target string, fstype string, flags uintptr, data string) (err error))
+
+var Mount = enter_Mount
+
+func enter_Mount(source string, target string, fstype string, flags uintptr, data string) (err error) {
+	funcref := get_MountAddr()
+	if validMount() {
+		*funcref = impl_Mount
+	} else {
+		*funcref = legacyMount
+	}
+	return (*funcref)(source, target, fstype, flags, data)
+}
+
+func legacyMount(source string, target string, fstype string, flags uintptr, data string) (err error) {
+	if needspace := 8 - len(fstype); needspace <= 0 {
+		fstype = fstype[0:8]
+	} else {
+		fstype += "        "[0:needspace]
+	}
+	return mount_LE(target, source, fstype, uint32(flags), int32(len(data)), data)
+}
+
+func validMount() bool {
+	if funcptrtest(GetZosLibVec()+SYS___MOUNT1_A<<4, "") == 0 {
+		if name, err := getLeFuncName(GetZosLibVec() + SYS___MOUNT1_A<<4); err == nil {
+			return name == "__mount1_a"
+		}
+	}
+	return false
+}
+
+// Mount end
+
+// Unmount begin
+func impl_Unmount(target string, flags int) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(target)
+	if err != nil {
+		return
+	}
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___UMOUNT2_A<<4, uintptr(unsafe.Pointer(_p0)), uintptr(flags))
+	runtime.ExitSyscall()
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+//go:nosplit
+func get_UnmountAddr() *(func(target string, flags int) (err error))
+
+var Unmount = enter_Unmount
+
+func enter_Unmount(target string, flags int) (err error) {
+	funcref := get_UnmountAddr()
+	if funcptrtest(GetZosLibVec()+SYS___UMOUNT2_A<<4, "") == 0 {
+		*funcref = impl_Unmount
+	} else {
+		*funcref = legacyUnmount
+	}
+	return (*funcref)(target, flags)
+}
+
+func legacyUnmount(name string, mtm int) (err error) {
+	// mountpoint is always a full path and starts with a '/'
+	// check if input string is not a mountpoint but a filesystem name
+	if name[0] != '/' {
+		return unmount_LE(name, mtm)
+	}
+	// treat name as mountpoint
+	b2s := func(arr []byte) string {
+		var str string
+		for i := 0; i < len(arr); i++ {
+			if arr[i] == 0 {
+				str = string(arr[:i])
+				break
+			}
+		}
+		return str
+	}
+	var buffer struct {
+		header W_Mnth
+		fsinfo [64]W_Mntent
+	}
+	fs_count, err := W_Getmntent_A((*byte)(unsafe.Pointer(&buffer)), int(unsafe.Sizeof(buffer)))
+	if err == nil {
+		err = EINVAL
+		for i := 0; i < fs_count; i++ {
+			if b2s(buffer.fsinfo[i].Mountpoint[:]) == name {
+				err = unmount_LE(b2s(buffer.fsinfo[i].Fsname[:]), mtm)
+				break
+			}
+		}
+	} else if fs_count == 0 {
+		err = EINVAL
+	}
+	return err
+}
+
+// Unmount end
+
+func direntIno(buf []byte) (uint64, bool) {
+	return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino))
+}
+
+func direntReclen(buf []byte) (uint64, bool) {
+	return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
+}
+
+func direntNamlen(buf []byte) (uint64, bool) {
+	reclen, ok := direntReclen(buf)
+	if !ok {
+		return 0, false
+	}
+	return reclen - uint64(unsafe.Offsetof(Dirent{}.Name)), true
+}
+
+func direntLeToDirentUnix(dirent *direntLE, dir uintptr, path string) (Dirent, error) {
+	var d Dirent
+
+	d.Ino = uint64(dirent.Ino)
+	offset, err := Telldir(dir)
+	if err != nil {
+		return d, err
+	}
+
+	d.Off = int64(offset)
+	s := string(bytes.Split(dirent.Name[:], []byte{0})[0])
+	copy(d.Name[:], s)
+
+	d.Reclen = uint16(24 + len(d.NameString()))
+	var st Stat_t
+	path = path + "/" + s
+	err = Lstat(path, &st)
+	if err != nil {
+		return d, err
+	}
+
+	d.Type = uint8(st.Mode >> 24)
+	return d, err
+}
+
+func Getdirentries(fd int, buf []byte, basep *uintptr) (n int, err error) {
+	// Simulation of Getdirentries port from the Darwin implementation.
+	// COMMENTS FROM DARWIN:
+	// It's not the full required semantics, but should handle the case
+	// of calling Getdirentries or ReadDirent repeatedly.
+	// It won't handle assigning the results of lseek to *basep, or handle
+	// the directory being edited underfoot.
+
+	skip, err := Seek(fd, 0, 1 /* SEEK_CUR */)
+	if err != nil {
+		return 0, err
+	}
+
+	// Get path from fd to avoid unavailable call (fdopendir)
+	path, err := ZosFdToPath(fd)
+	if err != nil {
+		return 0, err
+	}
+	d, err := Opendir(path)
+	if err != nil {
+		return 0, err
+	}
+	defer Closedir(d)
+
+	var cnt int64
+	for {
+		var entryLE direntLE
+		var entrypLE *direntLE
+		e := Readdir_r(d, &entryLE, &entrypLE)
+		if e != nil {
+			return n, e
+		}
+		if entrypLE == nil {
+			break
+		}
+		if skip > 0 {
+			skip--
+			cnt++
+			continue
+		}
+
+		// Dirent on zos has a different structure
+		entry, e := direntLeToDirentUnix(&entryLE, d, path)
+		if e != nil {
+			return n, e
+		}
+
+		reclen := int(entry.Reclen)
+		if reclen > len(buf) {
+			// Not enough room. Return for now.
+			// The counter will let us know where we should start up again.
+			// Note: this strategy for suspending in the middle and
+			// restarting is O(n^2) in the length of the directory. Oh well.
+			break
+		}
+
+		// Copy entry into return buffer.
+		s := unsafe.Slice((*byte)(unsafe.Pointer(&entry)), reclen)
+		copy(buf, s)
+
+		buf = buf[reclen:]
+		n += reclen
+		cnt++
+	}
+	// Set the seek offset of the input fd to record
+	// how many files we've already returned.
+	_, err = Seek(fd, cnt, 0 /* SEEK_SET */)
+	if err != nil {
+		return n, err
+	}
+
+	return n, nil
+}
+
+func Err2ad() (eadd *int) {
+	r0, _, _ := CallLeFuncWithErr(GetZosLibVec() + SYS___ERR2AD<<4)
+	eadd = (*int)(unsafe.Pointer(r0))
+	return
+}
+
+func ZosConsolePrintf(format string, v ...interface{}) (int, error) {
+	type __cmsg struct {
+		_            uint16
+		_            [2]uint8
+		__msg_length uint32
+		__msg        uintptr
+		_            [4]uint8
+	}
+	msg := fmt.Sprintf(format, v...)
+	strptr := unsafe.Pointer((*reflect.StringHeader)(unsafe.Pointer(&msg)).Data)
+	len := (*reflect.StringHeader)(unsafe.Pointer(&msg)).Len
+	cmsg := __cmsg{__msg_length: uint32(len), __msg: uintptr(strptr)}
+	cmd := uint32(0)
+	runtime.EnterSyscall()
+	rc, err2, err1 := CallLeFuncWithErr(GetZosLibVec()+SYS_____CONSOLE_A<<4, uintptr(unsafe.Pointer(&cmsg)), 0, uintptr(unsafe.Pointer(&cmd)))
+	runtime.ExitSyscall()
+	if rc != 0 {
+		return 0, fmt.Errorf("%s (errno2=0x%x)\n", err1.Error(), err2)
+	}
+	return 0, nil
+}
+func ZosStringToEbcdicBytes(str string, nullterm bool) (ebcdicBytes []byte) {
+	if nullterm {
+		ebcdicBytes = []byte(str + "\x00")
+	} else {
+		ebcdicBytes = []byte(str)
+	}
+	A2e(ebcdicBytes)
+	return
+}
+func ZosEbcdicBytesToString(b []byte, trimRight bool) (str string) {
+	res := make([]byte, len(b))
+	copy(res, b)
+	E2a(res)
+	if trimRight {
+		str = string(bytes.TrimRight(res, " \x00"))
+	} else {
+		str = string(res)
+	}
+	return
+}
+
+func fdToPath(dirfd int) (path string, err error) {
+	var buffer [1024]byte
+	// w_ctrl()
+	ret := runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS_W_IOCTL<<4,
+		[]uintptr{uintptr(dirfd), 17, 1024, uintptr(unsafe.Pointer(&buffer[0]))})
+	if ret == 0 {
+		zb := bytes.IndexByte(buffer[:], 0)
+		if zb == -1 {
+			zb = len(buffer)
+		}
+		// __e2a_l()
+		runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS___E2A_L<<4,
+			[]uintptr{uintptr(unsafe.Pointer(&buffer[0])), uintptr(zb)})
+		return string(buffer[:zb]), nil
+	}
+	// __errno()
+	errno := int(*(*int32)(unsafe.Pointer(runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS___ERRNO<<4,
+		[]uintptr{}))))
+	// __errno2()
+	errno2 := int(runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS___ERRNO2<<4,
+		[]uintptr{}))
+	// strerror_r()
+	ret = runtime.CallLeFuncByPtr(runtime.XplinkLibvec+SYS_STRERROR_R<<4,
+		[]uintptr{uintptr(errno), uintptr(unsafe.Pointer(&buffer[0])), 1024})
+	if ret == 0 {
+		zb := bytes.IndexByte(buffer[:], 0)
+		if zb == -1 {
+			zb = len(buffer)
+		}
+		return "", fmt.Errorf("%s (errno2=0x%x)", buffer[:zb], errno2)
+	} else {
+		return "", fmt.Errorf("fdToPath errno %d (errno2=0x%x)", errno, errno2)
+	}
+}
+
+func impl_Mkfifoat(dirfd int, path string, mode uint32) (err error) {
+	var _p0 *byte
+	_p0, err = BytePtrFromString(path)
+	if err != nil {
+		return
+	}
+	runtime.EnterSyscall()
+	r0, e2, e1 := CallLeFuncWithErr(GetZosLibVec()+SYS___MKFIFOAT_A<<4, uintptr(dirfd), uintptr(unsafe.Pointer(_p0)), uintptr(mode))
+	runtime.ExitSyscall()
+	if int64(r0) == -1 {
+		err = errnoErr2(e1, e2)
+	}
+	return
+}
+
+//go:nosplit
+func get_MkfifoatAddr() *(func(dirfd int, path string, mode uint32) (err error))
+
+var Mkfifoat = enter_Mkfifoat
+
+func enter_Mkfifoat(dirfd int, path string, mode uint32) (err error) {
+	funcref := get_MkfifoatAddr()
+	if funcptrtest(GetZosLibVec()+SYS___MKFIFOAT_A<<4, "") == 0 {
+		*funcref = impl_Mkfifoat
+	} else {
+		*funcref = legacy_Mkfifoat
+	}
+	return (*funcref)(dirfd, path, mode)
+}
+
+func legacy_Mkfifoat(dirfd int, path string, mode uint32) (err error) {
+	dirname, err := ZosFdToPath(dirfd)
+	if err != nil {
+		return err
+	}
+	return Mkfifo(dirname+"/"+path, mode)
+}
+
+//sys	Posix_openpt(oflag int) (fd int, err error) = SYS_POSIX_OPENPT
+//sys	Grantpt(fildes int) (rc int, err error) = SYS_GRANTPT
+//sys	Unlockpt(fildes int) (rc int, err error) = SYS_UNLOCKPT