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// Copyright 2011 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.
// POSIX library calls.
// This file is compiled as ordinary Go code,
// but it is also input to mksyscall,
// which parses the //sys lines and generates library call stubs.
// Note that sometimes we use a lowercase //sys name and
// wrap it in our own nicer implementation.
package syscall
import "unsafe"
* Wrapped
//sysnb pipe(p *[2]_C_int) (err error)
//pipe(p *[2]_C_int) _C_int
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])
//sys utimes(path string, times *[2]Timeval) (err error)
//utimes(path *byte, times *[2]Timeval) _C_int
func Utimes(path string, tv []Timeval) (err error) {
if len(tv) != 2 {
return EINVAL
return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
//sys getcwd(buf *byte, size Size_t) (err error)
//getcwd(buf *byte, size Size_t) *byte
const ImplementsGetwd = true
func Getwd() (ret string, err error) {
for len := Size_t(4096); ; len *= 2 {
b := make([]byte, len)
err := getcwd(&b[0], len)
if err == nil {
i := 0
for b[i] != 0 {
return string(b[0:i]), nil
if err != ERANGE {
return "", err
func Getcwd(buf []byte) (n int, err error) {
err = getcwd(&buf[0], Size_t(len(buf)))
if err == nil {
i := 0
for buf[i] != 0 {
n = i + 1
//sysnb getgroups(size int, list *Gid_t) (nn int, err error)
//getgroups(size _C_int, list *Gid_t) _C_int
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 GNU/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)
//sysnb setgroups(n int, list *Gid_t) (err error)
//setgroups(n Size_t, list *Gid_t) _C_int
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])
type WaitStatus uint32
// The WaitStatus methods are implemented in C, to pick up the macros
// #defines in <sys/wait.h>.
func (w WaitStatus) Exited() bool
func (w WaitStatus) Signaled() bool
func (w WaitStatus) Stopped() bool
func (w WaitStatus) Continued() bool
func (w WaitStatus) CoreDump() bool
func (w WaitStatus) ExitStatus() int
func (w WaitStatus) Signal() Signal
func (w WaitStatus) StopSignal() Signal
func (w WaitStatus) TrapCause() int
//sys Mkfifo(path string, mode uint32) (err error)
//mkfifo(path *byte, mode Mode_t) _C_int
//sys Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
//select(nfd _C_int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) _C_int
const nfdbits = int(unsafe.Sizeof(fds_bits_type(0)) * 8)
type FdSet struct {
Bits [(FD_SETSIZE + nfdbits - 1) / nfdbits]fds_bits_type
func FDSet(fd int, set *FdSet) {
set.Bits[fd/nfdbits] |= (1 << (uint)(fd%nfdbits))
func FDClr(fd int, set *FdSet) {
set.Bits[fd/nfdbits] &^= (1 << (uint)(fd%nfdbits))
func FDIsSet(fd int, set *FdSet) bool {
if set.Bits[fd/nfdbits]&(1<<(uint)(fd%nfdbits)) != 0 {
return true
} else {
return false
func FDZero(set *FdSet) {
for i := range set.Bits {
set.Bits[i] = 0
//sys Access(path string, mode uint32) (err error)
//access(path *byte, mode _C_int) _C_int
//sys Chdir(path string) (err error)
//chdir(path *byte) _C_int
//sys Chmod(path string, mode uint32) (err error)
//chmod(path *byte, mode Mode_t) _C_int
//sys Chown(path string, uid int, gid int) (err error)
//chown(path *byte, uid Uid_t, gid Gid_t) _C_int
//sys Chroot(path string) (err error)
//chroot(path *byte) _C_int
//sys Close(fd int) (err error)
//close(fd _C_int) _C_int
//sysnb Dup(oldfd int) (fd int, err error)
//dup(oldfd _C_int) _C_int
//sysnb Dup2(oldfd int, newfd int) (err error)
//dup2(oldfd _C_int, newfd _C_int) _C_int
//sys Fchdir(fd int) (err error)
//fchdir(fd _C_int) _C_int
//sys Fchmod(fd int, mode uint32) (err error)
//fchmod(fd _C_int, mode Mode_t) _C_int
//sys Fchown(fd int, uid int, gid int) (err error)
//fchown(fd _C_int, uid Uid_t, gid Gid_t) _C_int
//sys fcntl(fd int, cmd int, arg int) (val int, err error)
//__go_fcntl(fd _C_int, cmd _C_int, arg _C_int) _C_int
//sys FcntlFlock(fd uintptr, cmd int, lk *Flock_t) (err error)
//__go_fcntl_flock(fd _C_int, cmd _C_int, arg *Flock_t) _C_int
//sys Fdatasync(fd int) (err error)
//fdatasync(fd _C_int) _C_int
//sys Fsync(fd int) (err error)
//fsync(fd _C_int) _C_int
//sysnb Getegid() (egid int)
//getegid() Gid_t
//sysnb Geteuid() (euid int)
//geteuid() Uid_t
//sysnb Getgid() (gid int)
//getgid() Gid_t
//sysnb Getpgid(pid int) (pgid int, err error)
//getpgid(pid Pid_t) Pid_t
//sysnb Getpgrp() (pid int)
//getpgrp() Pid_t
//sysnb Getpid() (pid int)
//getpid() Pid_t
//sysnb Getppid() (ppid int)
//getppid() Pid_t
//sys Getpriority(which int, who int) (prio int, err error)
//getpriority(which _C_int, who _C_int) _C_int
//sysnb Getrusage(who int, rusage *Rusage) (err error)
//getrusage(who _C_int, rusage *Rusage) _C_int
//sysnb gettimeofday(tv *Timeval, tz *byte) (err error)
//gettimeofday(tv *Timeval, tz *byte) _C_int
func Gettimeofday(tv *Timeval) (err error) {
return gettimeofday(tv, nil)
//sysnb Getuid() (uid int)
//getuid() Uid_t
//sysnb Kill(pid int, sig Signal) (err error)
//kill(pid Pid_t, sig _C_int) _C_int
//sys Lchown(path string, uid int, gid int) (err error)
//lchown(path *byte, uid Uid_t, gid Gid_t) _C_int
//sys Link(oldpath string, newpath string) (err error)
//link(oldpath *byte, newpath *byte) _C_int
//sys Mkdir(path string, mode uint32) (err error)
//mkdir(path *byte, mode Mode_t) _C_int
//sys Mknod(path string, mode uint32, dev int) (err error)
//mknod(path *byte, mode Mode_t, dev _dev_t) _C_int
//sys Nanosleep(time *Timespec, leftover *Timespec) (err error)
//nanosleep(time *Timespec, leftover *Timespec) _C_int
//sys Pause() (err error)
//pause() _C_int
//sys read(fd int, p []byte) (n int, err error)
//read(fd _C_int, buf *byte, count Size_t) Ssize_t
//sys readlen(fd int, p *byte, np int) (n int, err error)
//read(fd _C_int, buf *byte, count Size_t) Ssize_t
//sys Readlink(path string, buf []byte) (n int, err error)
//readlink(path *byte, buf *byte, bufsiz Size_t) Ssize_t
//sys Rename(oldpath string, newpath string) (err error)
//rename(oldpath *byte, newpath *byte) _C_int
//sys Rmdir(path string) (err error)
//rmdir(path *byte) _C_int
//sys Setdomainname(p []byte) (err error)
//setdomainname(name *byte, len Size_t) _C_int
//sys Sethostname(p []byte) (err error)
//sethostname(name *byte, len Size_t) _C_int
//sysnb Setgid(gid int) (err error)
//setgid(gid Gid_t) _C_int
//sysnb Setegid(uid int) (err error)
//setegid(uid Uid_t) _C_int
//sysnb Setregid(rgid int, egid int) (err error)
//setregid(rgid Gid_t, egid Gid_t) _C_int
//sysnb Setpgid(pid int, pgid int) (err error)
//setpgid(pid Pid_t, pgid Pid_t) _C_int
//sys Setpriority(which int, who int, prio int) (err error)
//setpriority(which _C_int, who _C_int, prio _C_int) _C_int
//sysnb Setreuid(ruid int, euid int) (err error)
//setreuid(ruid Uid_t, euid Uid_t) _C_int
//sysnb Setsid() (pid int, err error)
//setsid() Pid_t
//sysnb settimeofday(tv *Timeval, tz *byte) (err error)
//settimeofday(tv *Timeval, tz *byte) _C_int
func Settimeofday(tv *Timeval) (err error) {
return settimeofday(tv, nil)
//sysnb Setuid(uid int) (err error)
//setuid(uid Uid_t) _C_int
//sysnb Seteuid(uid int) (err error)
//seteuid(uid Uid_t) _C_int
//sys Symlink(oldpath string, newpath string) (err error)
//symlink(oldpath *byte, newpath *byte) _C_int
//sys Sync()
//sysnb Time(t *Time_t) (tt Time_t, err error)
//time(t *Time_t) Time_t
//sysnb Times(tms *Tms) (ticks uintptr, err error)
//times(tms *Tms) _clock_t
//sysnb Umask(mask int) (oldmask int)
//umask(mask Mode_t) Mode_t
//sys Unlink(path string) (err error)
//unlink(path *byte) _C_int
//sys Utime(path string, buf *Utimbuf) (err error)
//utime(path *byte, buf *Utimbuf) _C_int
//sys write(fd int, p []byte) (n int, err error)
//write(fd _C_int, buf *byte, count Size_t) Ssize_t
//sys writelen(fd int, p *byte, np int) (n int, err error)
//write(fd _C_int, buf *byte, count Size_t) Ssize_t
//sys munmap(addr uintptr, length uintptr) (err error)
//munmap(addr *byte, length Size_t) _C_int
//sys Mprotect(b []byte, prot int) (err error)
//mprotect(addr *byte, len Size_t, prot _C_int) _C_int
//sys Mlock(b []byte) (err error)
//mlock(addr *byte, len Size_t) _C_int
//sys Munlock(b []byte) (err error)
//munlock(addr *byte, len Size_t) _C_int
//sys Mlockall(flags int) (err error)
//mlockall(flags _C_int) _C_int
//sys Munlockall() (err error)
//munlockall() _C_int
func setTimespec(sec, nsec int64) Timespec {
return Timespec{Sec: Timespec_sec_t(sec), Nsec: Timespec_nsec_t(nsec)}
func setTimeval(sec, usec int64) Timeval {
return Timeval{Sec: Timeval_sec_t(sec), Usec: Timeval_usec_t(usec)}
//sysnb Tcgetattr(fd int, p *Termios) (err error)
//tcgetattr(fd _C_int, p *Termios) _C_int
//sys Tcsetattr(fd int, actions int, p *Termios) (err error)
//tcsetattr(fd _C_int, actions _C_int, p *Termios) _C_int
//sys sysconf(name int) (ret int64, err error)
//sysconf(name _C_int) _C_long
func Sysconf(name int) (ret int64, err error) {
// If an option is not available, sysconf returns -1 without
// changing errno. Detect this case and return err == nil.
ret, err = sysconf(name)
if err == Errno(0) {
err = nil
return ret, err