syscall_aix.go

Documentation: cmd/vendor/golang.org/x/sys/unix

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build aix
     6  
     7  // Aix system calls.
     8  // This file is compiled as ordinary Go code,
     9  // but it is also input to mksyscall,
    10  // which parses the //sys lines and generates system call stubs.
    11  // Note that sometimes we use a lowercase //sys name and
    12  // wrap it in our own nicer implementation.
    13  
    14  package unix
    15  
    16  import "unsafe"
    17  
    18  /*
    19   * Wrapped
    20   */
    21  
    22  func Access(path string, mode uint32) (err error) {
    23  	return Faccessat(AT_FDCWD, path, mode, 0)
    24  }
    25  
    26  func Chmod(path string, mode uint32) (err error) {
    27  	return Fchmodat(AT_FDCWD, path, mode, 0)
    28  }
    29  
    30  func Chown(path string, uid int, gid int) (err error) {
    31  	return Fchownat(AT_FDCWD, path, uid, gid, 0)
    32  }
    33  
    34  func Creat(path string, mode uint32) (fd int, err error) {
    35  	return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode)
    36  }
    37  
    38  //sys	utimes(path string, times *[2]Timeval) (err error)
    39  
    40  func Utimes(path string, tv []Timeval) error {
    41  	if len(tv) != 2 {
    42  		return EINVAL
    43  	}
    44  	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
    45  }
    46  
    47  //sys	utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error)
    48  
    49  func UtimesNano(path string, ts []Timespec) error {
    50  	if len(ts) != 2 {
    51  		return EINVAL
    52  	}
    53  	return utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
    54  }
    55  
    56  func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error {
    57  	if ts == nil {
    58  		return utimensat(dirfd, path, nil, flags)
    59  	}
    60  	if len(ts) != 2 {
    61  		return EINVAL
    62  	}
    63  	return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags)
    64  }
    65  
    66  func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
    67  	if sa.Port < 0 || sa.Port > 0xFFFF {
    68  		return nil, 0, EINVAL
    69  	}
    70  	sa.raw.Family = AF_INET
    71  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
    72  	p[0] = byte(sa.Port >> 8)
    73  	p[1] = byte(sa.Port)
    74  	sa.raw.Addr = sa.Addr
    75  	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil
    76  }
    77  
    78  func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
    79  	if sa.Port < 0 || sa.Port > 0xFFFF {
    80  		return nil, 0, EINVAL
    81  	}
    82  	sa.raw.Family = AF_INET6
    83  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
    84  	p[0] = byte(sa.Port >> 8)
    85  	p[1] = byte(sa.Port)
    86  	sa.raw.Scope_id = sa.ZoneId
    87  	sa.raw.Addr = sa.Addr
    88  	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
    89  }
    90  
    91  func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
    92  	name := sa.Name
    93  	n := len(name)
    94  	if n > len(sa.raw.Path) {
    95  		return nil, 0, EINVAL
    96  	}
    97  	if n == len(sa.raw.Path) && name[0] != '@' {
    98  		return nil, 0, EINVAL
    99  	}
   100  	sa.raw.Family = AF_UNIX
   101  	for i := 0; i < n; i++ {
   102  		sa.raw.Path[i] = uint8(name[i])
   103  	}
   104  	// length is family (uint16), name, NUL.
   105  	sl := _Socklen(2)
   106  	if n > 0 {
   107  		sl += _Socklen(n) + 1
   108  	}
   109  	if sa.raw.Path[0] == '@' || (sa.raw.Path[0] == 0 && sl > 3) {
   110  		// Check sl > 3 so we don't change unnamed socket behavior.
   111  		sa.raw.Path[0] = 0
   112  		// Don't count trailing NUL for abstract address.
   113  		sl--
   114  	}
   115  
   116  	return unsafe.Pointer(&sa.raw), sl, nil
   117  }
   118  
   119  func Getsockname(fd int) (sa Sockaddr, err error) {
   120  	var rsa RawSockaddrAny
   121  	var len _Socklen = SizeofSockaddrAny
   122  	if err = getsockname(fd, &rsa, &len); err != nil {
   123  		return
   124  	}
   125  	return anyToSockaddr(fd, &rsa)
   126  }
   127  
   128  //sys	getcwd(buf []byte) (err error)
   129  
   130  const ImplementsGetwd = true
   131  
   132  func Getwd() (ret string, err error) {
   133  	for len := uint64(4096); ; len *= 2 {
   134  		b := make([]byte, len)
   135  		err := getcwd(b)
   136  		if err == nil {
   137  			i := 0
   138  			for b[i] != 0 {
   139  				i++
   140  			}
   141  			return string(b[0:i]), nil
   142  		}
   143  		if err != ERANGE {
   144  			return "", err
   145  		}
   146  	}
   147  }
   148  
   149  func Getcwd(buf []byte) (n int, err error) {
   150  	err = getcwd(buf)
   151  	if err == nil {
   152  		i := 0
   153  		for buf[i] != 0 {
   154  			i++
   155  		}
   156  		n = i + 1
   157  	}
   158  	return
   159  }
   160  
   161  func Getgroups() (gids []int, err error) {
   162  	n, err := getgroups(0, nil)
   163  	if err != nil {
   164  		return nil, err
   165  	}
   166  	if n == 0 {
   167  		return nil, nil
   168  	}
   169  
   170  	// Sanity check group count. Max is 16 on BSD.
   171  	if n < 0 || n > 1000 {
   172  		return nil, EINVAL
   173  	}
   174  
   175  	a := make([]_Gid_t, n)
   176  	n, err = getgroups(n, &a[0])
   177  	if err != nil {
   178  		return nil, err
   179  	}
   180  	gids = make([]int, n)
   181  	for i, v := range a[0:n] {
   182  		gids[i] = int(v)
   183  	}
   184  	return
   185  }
   186  
   187  func Setgroups(gids []int) (err error) {
   188  	if len(gids) == 0 {
   189  		return setgroups(0, nil)
   190  	}
   191  
   192  	a := make([]_Gid_t, len(gids))
   193  	for i, v := range gids {
   194  		a[i] = _Gid_t(v)
   195  	}
   196  	return setgroups(len(a), &a[0])
   197  }
   198  
   199  /*
   200   * Socket
   201   */
   202  
   203  //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
   204  
   205  func Accept(fd int) (nfd int, sa Sockaddr, err error) {
   206  	var rsa RawSockaddrAny
   207  	var len _Socklen = SizeofSockaddrAny
   208  	nfd, err = accept(fd, &rsa, &len)
   209  	if nfd == -1 {
   210  		return
   211  	}
   212  	sa, err = anyToSockaddr(fd, &rsa)
   213  	if err != nil {
   214  		Close(nfd)
   215  		nfd = 0
   216  	}
   217  	return
   218  }
   219  
   220  func recvmsgRaw(fd int, iov []Iovec, oob []byte, flags int, rsa *RawSockaddrAny) (n, oobn int, recvflags int, err error) {
   221  	var msg Msghdr
   222  	msg.Name = (*byte)(unsafe.Pointer(rsa))
   223  	msg.Namelen = uint32(SizeofSockaddrAny)
   224  	var dummy byte
   225  	if len(oob) > 0 {
   226  		// receive at least one normal byte
   227  		if emptyIovecs(iov) {
   228  			var iova [1]Iovec
   229  			iova[0].Base = &dummy
   230  			iova[0].SetLen(1)
   231  			iov = iova[:]
   232  		}
   233  		msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
   234  		msg.SetControllen(len(oob))
   235  	}
   236  	if len(iov) > 0 {
   237  		msg.Iov = &iov[0]
   238  		msg.SetIovlen(len(iov))
   239  	}
   240  	if n, err = recvmsg(fd, &msg, flags); n == -1 {
   241  		return
   242  	}
   243  	oobn = int(msg.Controllen)
   244  	recvflags = int(msg.Flags)
   245  	return
   246  }
   247  
   248  func sendmsgN(fd int, iov []Iovec, oob []byte, ptr unsafe.Pointer, salen _Socklen, flags int) (n int, err error) {
   249  	var msg Msghdr
   250  	msg.Name = (*byte)(unsafe.Pointer(ptr))
   251  	msg.Namelen = uint32(salen)
   252  	var dummy byte
   253  	var empty bool
   254  	if len(oob) > 0 {
   255  		// send at least one normal byte
   256  		empty = emptyIovecs(iov)
   257  		if empty {
   258  			var iova [1]Iovec
   259  			iova[0].Base = &dummy
   260  			iova[0].SetLen(1)
   261  			iov = iova[:]
   262  		}
   263  		msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
   264  		msg.SetControllen(len(oob))
   265  	}
   266  	if len(iov) > 0 {
   267  		msg.Iov = &iov[0]
   268  		msg.SetIovlen(len(iov))
   269  	}
   270  	if n, err = sendmsg(fd, &msg, flags); err != nil {
   271  		return 0, err
   272  	}
   273  	if len(oob) > 0 && empty {
   274  		n = 0
   275  	}
   276  	return n, nil
   277  }
   278  
   279  func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
   280  	switch rsa.Addr.Family {
   281  
   282  	case AF_UNIX:
   283  		pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
   284  		sa := new(SockaddrUnix)
   285  
   286  		// Some versions of AIX have a bug in getsockname (see IV78655).
   287  		// We can't rely on sa.Len being set correctly.
   288  		n := SizeofSockaddrUnix - 3 // subtract leading Family, Len, terminating NUL.
   289  		for i := 0; i < n; i++ {
   290  			if pp.Path[i] == 0 {
   291  				n = i
   292  				break
   293  			}
   294  		}
   295  		sa.Name = string(unsafe.Slice((*byte)(unsafe.Pointer(&pp.Path[0])), n))
   296  		return sa, nil
   297  
   298  	case AF_INET:
   299  		pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
   300  		sa := new(SockaddrInet4)
   301  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   302  		sa.Port = int(p[0])<<8 + int(p[1])
   303  		sa.Addr = pp.Addr
   304  		return sa, nil
   305  
   306  	case AF_INET6:
   307  		pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
   308  		sa := new(SockaddrInet6)
   309  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   310  		sa.Port = int(p[0])<<8 + int(p[1])
   311  		sa.ZoneId = pp.Scope_id
   312  		sa.Addr = pp.Addr
   313  		return sa, nil
   314  	}
   315  	return nil, EAFNOSUPPORT
   316  }
   317  
   318  func Gettimeofday(tv *Timeval) (err error) {
   319  	err = gettimeofday(tv, nil)
   320  	return
   321  }
   322  
   323  func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
   324  	if raceenabled {
   325  		raceReleaseMerge(unsafe.Pointer(&ioSync))
   326  	}
   327  	return sendfile(outfd, infd, offset, count)
   328  }
   329  
   330  // TODO
   331  func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
   332  	return -1, ENOSYS
   333  }
   334  
   335  func direntIno(buf []byte) (uint64, bool) {
   336  	return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino))
   337  }
   338  
   339  func direntReclen(buf []byte) (uint64, bool) {
   340  	return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
   341  }
   342  
   343  func direntNamlen(buf []byte) (uint64, bool) {
   344  	reclen, ok := direntReclen(buf)
   345  	if !ok {
   346  		return 0, false
   347  	}
   348  	return reclen - uint64(unsafe.Offsetof(Dirent{}.Name)), true
   349  }
   350  
   351  //sys	getdirent(fd int, buf []byte) (n int, err error)
   352  
   353  func Getdents(fd int, buf []byte) (n int, err error) {
   354  	return getdirent(fd, buf)
   355  }
   356  
   357  //sys	wait4(pid Pid_t, status *_C_int, options int, rusage *Rusage) (wpid Pid_t, err error)
   358  
   359  func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
   360  	var status _C_int
   361  	var r Pid_t
   362  	err = ERESTART
   363  	// AIX wait4 may return with ERESTART errno, while the processus is still
   364  	// active.
   365  	for err == ERESTART {
   366  		r, err = wait4(Pid_t(pid), &status, options, rusage)
   367  	}
   368  	wpid = int(r)
   369  	if wstatus != nil {
   370  		*wstatus = WaitStatus(status)
   371  	}
   372  	return
   373  }
   374  
   375  /*
   376   * Wait
   377   */
   378  
   379  type WaitStatus uint32
   380  
   381  func (w WaitStatus) Stopped() bool { return w&0x40 != 0 }
   382  func (w WaitStatus) StopSignal() Signal {
   383  	if !w.Stopped() {
   384  		return -1
   385  	}
   386  	return Signal(w>>8) & 0xFF
   387  }
   388  
   389  func (w WaitStatus) Exited() bool { return w&0xFF == 0 }
   390  func (w WaitStatus) ExitStatus() int {
   391  	if !w.Exited() {
   392  		return -1
   393  	}
   394  	return int((w >> 8) & 0xFF)
   395  }
   396  
   397  func (w WaitStatus) Signaled() bool { return w&0x40 == 0 && w&0xFF != 0 }
   398  func (w WaitStatus) Signal() Signal {
   399  	if !w.Signaled() {
   400  		return -1
   401  	}
   402  	return Signal(w>>16) & 0xFF
   403  }
   404  
   405  func (w WaitStatus) Continued() bool { return w&0x01000000 != 0 }
   406  
   407  func (w WaitStatus) CoreDump() bool { return w&0x80 == 0x80 }
   408  
   409  func (w WaitStatus) TrapCause() int { return -1 }
   410  
   411  //sys	ioctl(fd int, req int, arg uintptr) (err error)
   412  //sys	ioctlPtr(fd int, req int, arg unsafe.Pointer) (err error) = ioctl
   413  
   414  // fcntl must never be called with cmd=F_DUP2FD because it doesn't work on AIX
   415  // There is no way to create a custom fcntl and to keep //sys fcntl easily,
   416  // Therefore, the programmer must call dup2 instead of fcntl in this case.
   417  
   418  // FcntlInt performs a fcntl syscall on fd with the provided command and argument.
   419  //sys	FcntlInt(fd uintptr, cmd int, arg int) (r int,err error) = fcntl
   420  
   421  // FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
   422  //sys	FcntlFlock(fd uintptr, cmd int, lk *Flock_t) (err error) = fcntl
   423  
   424  //sys	fcntl(fd int, cmd int, arg int) (val int, err error)
   425  
   426  //sys	fsyncRange(fd int, how int, start int64, length int64) (err error) = fsync_range
   427  
   428  func Fsync(fd int) error {
   429  	return fsyncRange(fd, O_SYNC, 0, 0)
   430  }
   431  
   432  /*
   433   * Direct access
   434   */
   435  
   436  //sys	Acct(path string) (err error)
   437  //sys	Chdir(path string) (err error)
   438  //sys	Chroot(path string) (err error)
   439  //sys	Close(fd int) (err error)
   440  //sys	Dup(oldfd int) (fd int, err error)
   441  //sys	Exit(code int)
   442  //sys	Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
   443  //sys	Fchdir(fd int) (err error)
   444  //sys	Fchmod(fd int, mode uint32) (err error)
   445  //sys	Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
   446  //sys	Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
   447  //sys	Fdatasync(fd int) (err error)
   448  // readdir_r
   449  //sysnb	Getpgid(pid int) (pgid int, err error)
   450  
   451  //sys	Getpgrp() (pid int)
   452  
   453  //sysnb	Getpid() (pid int)
   454  //sysnb	Getppid() (ppid int)
   455  //sys	Getpriority(which int, who int) (prio int, err error)
   456  //sysnb	Getrusage(who int, rusage *Rusage) (err error)
   457  //sysnb	Getsid(pid int) (sid int, err error)
   458  //sysnb	Kill(pid int, sig Signal) (err error)
   459  //sys	Klogctl(typ int, buf []byte) (n int, err error) = syslog
   460  //sys	Mkdir(dirfd int, path string, mode uint32) (err error)
   461  //sys	Mkdirat(dirfd int, path string, mode uint32) (err error)
   462  //sys	Mkfifo(path string, mode uint32) (err error)
   463  //sys	Mknod(path string, mode uint32, dev int) (err error)
   464  //sys	Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
   465  //sys	Nanosleep(time *Timespec, leftover *Timespec) (err error)
   466  //sys	Open(path string, mode int, perm uint32) (fd int, err error) = open64
   467  //sys	Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
   468  //sys	read(fd int, p []byte) (n int, err error)
   469  //sys	Readlink(path string, buf []byte) (n int, err error)
   470  //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
   471  //sys	Setdomainname(p []byte) (err error)
   472  //sys	Sethostname(p []byte) (err error)
   473  //sysnb	Setpgid(pid int, pgid int) (err error)
   474  //sysnb	Setsid() (pid int, err error)
   475  //sysnb	Settimeofday(tv *Timeval) (err error)
   476  
   477  //sys	Setuid(uid int) (err error)
   478  //sys	Setgid(uid int) (err error)
   479  
   480  //sys	Setpriority(which int, who int, prio int) (err error)
   481  //sys	Statx(dirfd int, path string, flags int, mask int, stat *Statx_t) (err error)
   482  //sys	Sync()
   483  //sysnb	Times(tms *Tms) (ticks uintptr, err error)
   484  //sysnb	Umask(mask int) (oldmask int)
   485  //sysnb	Uname(buf *Utsname) (err error)
   486  //sys	Unlink(path string) (err error)
   487  //sys	Unlinkat(dirfd int, path string, flags int) (err error)
   488  //sys	Ustat(dev int, ubuf *Ustat_t) (err error)
   489  //sys	write(fd int, p []byte) (n int, err error)
   490  
   491  //sys	Dup2(oldfd int, newfd int) (err error)
   492  //sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = posix_fadvise64
   493  //sys	Fchown(fd int, uid int, gid int) (err error)
   494  //sys	fstat(fd int, stat *Stat_t) (err error)
   495  //sys	fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = fstatat
   496  //sys	Fstatfs(fd int, buf *Statfs_t) (err error)
   497  //sys	Ftruncate(fd int, length int64) (err error)
   498  //sysnb	Getegid() (egid int)
   499  //sysnb	Geteuid() (euid int)
   500  //sysnb	Getgid() (gid int)
   501  //sysnb	Getuid() (uid int)
   502  //sys	Lchown(path string, uid int, gid int) (err error)
   503  //sys	Listen(s int, n int) (err error)
   504  //sys	lstat(path string, stat *Stat_t) (err error)
   505  //sys	Pause() (err error)
   506  //sys	pread(fd int, p []byte, offset int64) (n int, err error) = pread64
   507  //sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = pwrite64
   508  //sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error)
   509  //sys	Pselect(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timespec, sigmask *Sigset_t) (n int, err error)
   510  //sysnb	Setregid(rgid int, egid int) (err error)
   511  //sysnb	Setreuid(ruid int, euid int) (err error)
   512  //sys	Shutdown(fd int, how int) (err error)
   513  //sys	Splice(rfd int, roff *int64, wfd int, woff *int64, len int, flags int) (n int64, err error)
   514  //sys	stat(path string, statptr *Stat_t) (err error)
   515  //sys	Statfs(path string, buf *Statfs_t) (err error)
   516  //sys	Truncate(path string, length int64) (err error)
   517  
   518  //sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
   519  //sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
   520  //sysnb	getgroups(n int, list *_Gid_t) (nn int, err error)
   521  //sysnb	setgroups(n int, list *_Gid_t) (err error)
   522  //sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
   523  //sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
   524  //sysnb	socket(domain int, typ int, proto int) (fd int, err error)
   525  //sysnb	socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
   526  //sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
   527  //sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
   528  //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
   529  //sys	sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
   530  
   531  // In order to use msghdr structure with Control, Controllen, nrecvmsg and nsendmsg must be used.
   532  //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error) = nrecvmsg
   533  //sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error) = nsendmsg
   534  
   535  //sys	munmap(addr uintptr, length uintptr) (err error)
   536  //sys	Madvise(b []byte, advice int) (err error)
   537  //sys	Mprotect(b []byte, prot int) (err error)
   538  //sys	Mlock(b []byte) (err error)
   539  //sys	Mlockall(flags int) (err error)
   540  //sys	Msync(b []byte, flags int) (err error)
   541  //sys	Munlock(b []byte) (err error)
   542  //sys	Munlockall() (err error)
   543  
   544  //sysnb	pipe(p *[2]_C_int) (err error)
   545  
   546  func Pipe(p []int) (err error) {
   547  	if len(p) != 2 {
   548  		return EINVAL
   549  	}
   550  	var pp [2]_C_int
   551  	err = pipe(&pp)
   552  	if err == nil {
   553  		p[0] = int(pp[0])
   554  		p[1] = int(pp[1])
   555  	}
   556  	return
   557  }
   558  
   559  //sys	poll(fds *PollFd, nfds int, timeout int) (n int, err error)
   560  
   561  func Poll(fds []PollFd, timeout int) (n int, err error) {
   562  	if len(fds) == 0 {
   563  		return poll(nil, 0, timeout)
   564  	}
   565  	return poll(&fds[0], len(fds), timeout)
   566  }
   567  
   568  //sys	gettimeofday(tv *Timeval, tzp *Timezone) (err error)
   569  //sysnb	Time(t *Time_t) (tt Time_t, err error)
   570  //sys	Utime(path string, buf *Utimbuf) (err error)
   571  
   572  //sys	Getsystemcfg(label int) (n uint64)
   573  
   574  //sys	umount(target string) (err error)
   575  
   576  func Unmount(target string, flags int) (err error) {
   577  	if flags != 0 {
   578  		// AIX doesn't have any flags for umount.
   579  		return ENOSYS
   580  	}
   581  	return umount(target)
   582  }
   583
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