Source file src/syscall/syscall_aix.go

     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  // Aix system calls.
     6  // This file is compiled as ordinary Go code,
     7  // but it is also input to mksyscall,
     8  // which parses the //sys lines and generates system call stubs.
     9  // Note that sometimes we use a lowercase //sys name and
    10  // wrap it in our own nicer implementation.
    11  
    12  package syscall
    13  
    14  import (
    15  	"unsafe"
    16  )
    17  
    18  func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
    19  func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
    20  func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err Errno)
    21  func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
    22  
    23  // Implemented in runtime/syscall_aix.go.
    24  func rawSyscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
    25  func syscall6(trap, nargs, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err Errno)
    26  
    27  // Constant expected by package but not supported
    28  const (
    29  	_ = iota
    30  	TIOCSCTTY
    31  	SYS_EXECVE
    32  	SYS_FCNTL
    33  )
    34  
    35  const (
    36  	F_DUPFD_CLOEXEC = 0
    37  	// AF_LOCAL doesn't exist on AIX
    38  	AF_LOCAL = AF_UNIX
    39  
    40  	_F_DUP2FD_CLOEXEC = 0
    41  )
    42  
    43  func (ts *StTimespec_t) Unix() (sec int64, nsec int64) {
    44  	return int64(ts.Sec), int64(ts.Nsec)
    45  }
    46  
    47  func (ts *StTimespec_t) Nano() int64 {
    48  	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
    49  }
    50  
    51  /*
    52   * Wrapped
    53   */
    54  
    55  func Access(path string, mode uint32) (err error) {
    56  	return Faccessat(_AT_FDCWD, path, mode, 0)
    57  }
    58  
    59  // fcntl must never be called with cmd=F_DUP2FD because it doesn't work on AIX
    60  // There is no way to create a custom fcntl and to keep //sys fcntl easily,
    61  // because we need fcntl name for its libc symbol. This is linked with the script.
    62  // But, as fcntl is currently not exported and isn't called with F_DUP2FD,
    63  // it doesn't matter.
    64  //sys	fcntl(fd int, cmd int, arg int) (val int, err error)
    65  //sys	Dup2(old int, new int) (err error)
    66  
    67  //sysnb pipe(p *[2]_C_int) (err error)
    68  
    69  func Pipe(p []int) (err error) {
    70  	if len(p) != 2 {
    71  		return EINVAL
    72  	}
    73  	var pp [2]_C_int
    74  	err = pipe(&pp)
    75  	if err == nil {
    76  		p[0] = int(pp[0])
    77  		p[1] = int(pp[1])
    78  	}
    79  	return
    80  }
    81  
    82  //sys	readlink(path string, buf []byte, bufSize uint64) (n int, err error)
    83  
    84  func Readlink(path string, buf []byte) (n int, err error) {
    85  	s := uint64(len(buf))
    86  	return readlink(path, buf, s)
    87  }
    88  
    89  //sys	utimes(path string, times *[2]Timeval) (err error)
    90  
    91  func Utimes(path string, tv []Timeval) error {
    92  	if len(tv) != 2 {
    93  		return EINVAL
    94  	}
    95  	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
    96  }
    97  
    98  //sys	utimensat(dirfd int, path string, times *[2]Timespec, flag int) (err error)
    99  
   100  func UtimesNano(path string, ts []Timespec) error {
   101  	if len(ts) != 2 {
   102  		return EINVAL
   103  	}
   104  	return utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
   105  }
   106  
   107  //sys	unlinkat(dirfd int, path string, flags int) (err error)
   108  
   109  func Unlinkat(dirfd int, path string) (err error) {
   110  	return unlinkat(dirfd, path, 0)
   111  }
   112  
   113  //sys	getcwd(buf *byte, size uint64) (err error)
   114  
   115  const ImplementsGetwd = true
   116  
   117  func Getwd() (ret string, err error) {
   118  	for len := uint64(4096); ; len *= 2 {
   119  		b := make([]byte, len)
   120  		err := getcwd(&b[0], len)
   121  		if err == nil {
   122  			i := 0
   123  			for b[i] != 0 {
   124  				i++
   125  			}
   126  			return string(b[0:i]), nil
   127  		}
   128  		if err != ERANGE {
   129  			return "", err
   130  		}
   131  	}
   132  }
   133  
   134  func Getcwd(buf []byte) (n int, err error) {
   135  	err = getcwd(&buf[0], uint64(len(buf)))
   136  	if err == nil {
   137  		i := 0
   138  		for buf[i] != 0 {
   139  			i++
   140  		}
   141  		n = i + 1
   142  	}
   143  	return
   144  }
   145  
   146  //sysnb	getgroups(ngid int, gid *_Gid_t) (n int, err error)
   147  //sysnb	setgroups(ngid int, gid *_Gid_t) (err error)
   148  
   149  func Getgroups() (gids []int, err error) {
   150  	n, err := getgroups(0, nil)
   151  	if err != nil {
   152  		return nil, err
   153  	}
   154  	if n == 0 {
   155  		return nil, nil
   156  	}
   157  
   158  	// Sanity check group count. Max is 16 on BSD.
   159  	if n < 0 || n > 1000 {
   160  		return nil, EINVAL
   161  	}
   162  
   163  	a := make([]_Gid_t, n)
   164  	n, err = getgroups(n, &a[0])
   165  	if err != nil {
   166  		return nil, err
   167  	}
   168  	gids = make([]int, n)
   169  	for i, v := range a[0:n] {
   170  		gids[i] = int(v)
   171  	}
   172  	return
   173  }
   174  
   175  func Setgroups(gids []int) (err error) {
   176  	if len(gids) == 0 {
   177  		return setgroups(0, nil)
   178  	}
   179  
   180  	a := make([]_Gid_t, len(gids))
   181  	for i, v := range gids {
   182  		a[i] = _Gid_t(v)
   183  	}
   184  	return setgroups(len(a), &a[0])
   185  }
   186  
   187  func direntIno(buf []byte) (uint64, bool) {
   188  	return readInt(buf, unsafe.Offsetof(Dirent{}.Ino), unsafe.Sizeof(Dirent{}.Ino))
   189  }
   190  
   191  func direntReclen(buf []byte) (uint64, bool) {
   192  	return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
   193  }
   194  
   195  func direntNamlen(buf []byte) (uint64, bool) {
   196  	reclen, ok := direntReclen(buf)
   197  	if !ok {
   198  		return 0, false
   199  	}
   200  	return reclen - uint64(unsafe.Offsetof(Dirent{}.Name)), true
   201  }
   202  
   203  func Gettimeofday(tv *Timeval) (err error) {
   204  	err = gettimeofday(tv, nil)
   205  	return
   206  }
   207  
   208  // TODO
   209  func sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
   210  	return -1, ENOSYS
   211  }
   212  
   213  //sys	getdirent(fd int, buf []byte) (n int, err error)
   214  
   215  func ReadDirent(fd int, buf []byte) (n int, err error) {
   216  	return getdirent(fd, buf)
   217  }
   218  
   219  //sys  wait4(pid _Pid_t, status *_C_int, options int, rusage *Rusage) (wpid _Pid_t, err error)
   220  
   221  func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
   222  	var status _C_int
   223  	var r _Pid_t
   224  	err = ERESTART
   225  	// AIX wait4 may return with ERESTART errno, while the process is still
   226  	// active.
   227  	for err == ERESTART {
   228  		r, err = wait4(_Pid_t(pid), &status, options, rusage)
   229  	}
   230  	wpid = int(r)
   231  	if wstatus != nil {
   232  		*wstatus = WaitStatus(status)
   233  	}
   234  	return
   235  }
   236  
   237  //sys	fsyncRange(fd int, how int, start int64, length int64) (err error) = fsync_range
   238  
   239  func Fsync(fd int) error {
   240  	return fsyncRange(fd, O_SYNC, 0, 0)
   241  }
   242  
   243  /*
   244   * Socket
   245   */
   246  //sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
   247  //sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
   248  //sys   Getkerninfo(op int32, where uintptr, size uintptr, arg int64) (i int32, err error)
   249  //sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
   250  //sys	Listen(s int, backlog int) (err error)
   251  //sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
   252  //sys	socket(domain int, typ int, proto int) (fd int, err error)
   253  //sysnb	socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
   254  //sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
   255  //sys	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
   256  //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
   257  //sys	sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
   258  //sys	Shutdown(s int, how int) (err error)
   259  
   260  // In order to use msghdr structure with Control, Controllen in golang.org/x/net,
   261  // nrecvmsg and nsendmsg must be used.
   262  //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error) = nrecvmsg
   263  //sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error) = nsendmsg
   264  
   265  func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
   266  	if sa.Port < 0 || sa.Port > 0xFFFF {
   267  		return nil, 0, EINVAL
   268  	}
   269  	sa.raw.Family = AF_INET
   270  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
   271  	p[0] = byte(sa.Port >> 8)
   272  	p[1] = byte(sa.Port)
   273  	sa.raw.Addr = sa.Addr
   274  	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet4, nil
   275  }
   276  
   277  func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
   278  	if sa.Port < 0 || sa.Port > 0xFFFF {
   279  		return nil, 0, EINVAL
   280  	}
   281  	sa.raw.Family = AF_INET6
   282  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
   283  	p[0] = byte(sa.Port >> 8)
   284  	p[1] = byte(sa.Port)
   285  	sa.raw.Scope_id = sa.ZoneId
   286  	sa.raw.Addr = sa.Addr
   287  	return unsafe.Pointer(&sa.raw), SizeofSockaddrInet6, nil
   288  }
   289  
   290  func (sa *RawSockaddrUnix) setLen(n int) {
   291  	sa.Len = uint8(3 + n) // 2 for Family, Len; 1 for NUL.
   292  }
   293  
   294  func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
   295  	name := sa.Name
   296  	n := len(name)
   297  	if n > len(sa.raw.Path) {
   298  		return nil, 0, EINVAL
   299  	}
   300  	sa.raw.Family = AF_UNIX
   301  	sa.raw.setLen(n)
   302  	for i := 0; i < n; i++ {
   303  		sa.raw.Path[i] = uint8(name[i])
   304  	}
   305  	// length is family (uint16), name, NUL.
   306  	sl := _Socklen(2)
   307  	if n > 0 {
   308  		sl += _Socklen(n) + 1
   309  	}
   310  
   311  	return unsafe.Pointer(&sa.raw), sl, nil
   312  }
   313  
   314  func Getsockname(fd int) (sa Sockaddr, err error) {
   315  	var rsa RawSockaddrAny
   316  	var len _Socklen = SizeofSockaddrAny
   317  	if err = getsockname(fd, &rsa, &len); err != nil {
   318  		return
   319  	}
   320  	return anyToSockaddr(&rsa)
   321  }
   322  
   323  //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
   324  
   325  func Accept(fd int) (nfd int, sa Sockaddr, err error) {
   326  	var rsa RawSockaddrAny
   327  	var len _Socklen = SizeofSockaddrAny
   328  	nfd, err = accept(fd, &rsa, &len)
   329  	if err != nil {
   330  		return
   331  	}
   332  	sa, err = anyToSockaddr(&rsa)
   333  	if err != nil {
   334  		Close(nfd)
   335  		nfd = 0
   336  	}
   337  	return
   338  }
   339  
   340  func recvmsgRaw(fd int, p, oob []byte, flags int, rsa *RawSockaddrAny) (n, oobn int, recvflags int, err error) {
   341  	var msg Msghdr
   342  	msg.Name = (*byte)(unsafe.Pointer(rsa))
   343  	msg.Namelen = uint32(SizeofSockaddrAny)
   344  	var iov Iovec
   345  	if len(p) > 0 {
   346  		iov.Base = &p[0]
   347  		iov.SetLen(len(p))
   348  	}
   349  	var dummy byte
   350  	if len(oob) > 0 {
   351  		var sockType int
   352  		sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
   353  		if err != nil {
   354  			return
   355  		}
   356  		// receive at least one normal byte
   357  		if sockType != SOCK_DGRAM && len(p) == 0 {
   358  			iov.Base = &dummy
   359  			iov.SetLen(1)
   360  		}
   361  		msg.Control = &oob[0]
   362  		msg.SetControllen(len(oob))
   363  	}
   364  	msg.Iov = &iov
   365  	msg.Iovlen = 1
   366  	if n, err = recvmsg(fd, &msg, flags); err != nil {
   367  		return
   368  	}
   369  	oobn = int(msg.Controllen)
   370  	recvflags = int(msg.Flags)
   371  	return
   372  }
   373  
   374  func sendmsgN(fd int, p, oob []byte, ptr unsafe.Pointer, salen _Socklen, flags int) (n int, err error) {
   375  	var msg Msghdr
   376  	msg.Name = (*byte)(ptr)
   377  	msg.Namelen = uint32(salen)
   378  	var iov Iovec
   379  	if len(p) > 0 {
   380  		iov.Base = &p[0]
   381  		iov.SetLen(len(p))
   382  	}
   383  	var dummy byte
   384  	if len(oob) > 0 {
   385  		var sockType int
   386  		sockType, err = GetsockoptInt(fd, SOL_SOCKET, SO_TYPE)
   387  		if err != nil {
   388  			return 0, err
   389  		}
   390  		// send at least one normal byte
   391  		if sockType != SOCK_DGRAM && len(p) == 0 {
   392  			iov.Base = &dummy
   393  			iov.SetLen(1)
   394  		}
   395  		msg.Control = &oob[0]
   396  		msg.SetControllen(len(oob))
   397  	}
   398  	msg.Iov = &iov
   399  	msg.Iovlen = 1
   400  	if n, err = sendmsg(fd, &msg, flags); err != nil {
   401  		return 0, err
   402  	}
   403  	if len(oob) > 0 && len(p) == 0 {
   404  		n = 0
   405  	}
   406  	return n, nil
   407  }
   408  
   409  func (sa *RawSockaddrUnix) getLen() (int, error) {
   410  	// Some versions of AIX have a bug in getsockname (see IV78655).
   411  	// We can't rely on sa.Len being set correctly.
   412  	n := SizeofSockaddrUnix - 3 // subtract leading Family, Len, terminating NUL.
   413  	for i := 0; i < n; i++ {
   414  		if sa.Path[i] == 0 {
   415  			n = i
   416  			break
   417  		}
   418  	}
   419  	return n, nil
   420  }
   421  
   422  func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
   423  	switch rsa.Addr.Family {
   424  	case AF_UNIX:
   425  		pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
   426  		sa := new(SockaddrUnix)
   427  		n, err := pp.getLen()
   428  		if err != nil {
   429  			return nil, err
   430  		}
   431  		sa.Name = string(unsafe.Slice((*byte)(unsafe.Pointer(&pp.Path[0])), n))
   432  		return sa, nil
   433  
   434  	case AF_INET:
   435  		pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
   436  		sa := new(SockaddrInet4)
   437  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   438  		sa.Port = int(p[0])<<8 + int(p[1])
   439  		sa.Addr = pp.Addr
   440  		return sa, nil
   441  
   442  	case AF_INET6:
   443  		pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
   444  		sa := new(SockaddrInet6)
   445  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   446  		sa.Port = int(p[0])<<8 + int(p[1])
   447  		sa.Addr = pp.Addr
   448  		return sa, nil
   449  	}
   450  	return nil, EAFNOSUPPORT
   451  }
   452  
   453  type SockaddrDatalink struct {
   454  	Len    uint8
   455  	Family uint8
   456  	Index  uint16
   457  	Type   uint8
   458  	Nlen   uint8
   459  	Alen   uint8
   460  	Slen   uint8
   461  	Data   [120]uint8
   462  	raw    RawSockaddrDatalink
   463  }
   464  
   465  /*
   466   * Wait
   467   */
   468  
   469  type WaitStatus uint32
   470  
   471  func (w WaitStatus) Stopped() bool { return w&0x40 != 0 }
   472  func (w WaitStatus) StopSignal() Signal {
   473  	if !w.Stopped() {
   474  		return -1
   475  	}
   476  	return Signal(w>>8) & 0xFF
   477  }
   478  
   479  func (w WaitStatus) Exited() bool { return w&0xFF == 0 }
   480  func (w WaitStatus) ExitStatus() int {
   481  	if !w.Exited() {
   482  		return -1
   483  	}
   484  	return int((w >> 8) & 0xFF)
   485  }
   486  
   487  func (w WaitStatus) Signaled() bool { return w&0x40 == 0 && w&0xFF != 0 }
   488  func (w WaitStatus) Signal() Signal {
   489  	if !w.Signaled() {
   490  		return -1
   491  	}
   492  	return Signal(w>>16) & 0xFF
   493  }
   494  
   495  func (w WaitStatus) Continued() bool { return w&0x01000000 != 0 }
   496  
   497  func (w WaitStatus) CoreDump() bool { return w&0x80 == 0x80 }
   498  
   499  func (w WaitStatus) TrapCause() int { return -1 }
   500  
   501  /*
   502   * ptrace
   503   */
   504  
   505  //sys	Openat(dirfd int, path string, flags int, mode uint32) (fd int, err error)
   506  //sys	ptrace64(request int, id int64, addr int64, data int, buff uintptr) (err error)
   507  //sys	ptrace64Ptr(request int, id int64, addr int64, data int, buff unsafe.Pointer) (err error) = ptrace64
   508  
   509  func raw_ptrace(request int, pid int, addr *byte, data *byte) Errno {
   510  	if request == PTRACE_TRACEME {
   511  		// Convert to AIX ptrace call.
   512  		err := ptrace64(PT_TRACE_ME, 0, 0, 0, 0)
   513  		if err != nil {
   514  			return err.(Errno)
   515  		}
   516  		return 0
   517  	}
   518  	return ENOSYS
   519  }
   520  
   521  func ptracePeek(pid int, addr uintptr, out []byte) (count int, err error) {
   522  	n := 0
   523  	for len(out) > 0 {
   524  		bsize := len(out)
   525  		if bsize > 1024 {
   526  			bsize = 1024
   527  		}
   528  		err = ptrace64Ptr(PT_READ_BLOCK, int64(pid), int64(addr), bsize, unsafe.Pointer(&out[0]))
   529  		if err != nil {
   530  			return 0, err
   531  		}
   532  		addr += uintptr(bsize)
   533  		n += bsize
   534  		out = out[n:]
   535  	}
   536  	return n, nil
   537  }
   538  
   539  func PtracePeekText(pid int, addr uintptr, out []byte) (count int, err error) {
   540  	return ptracePeek(pid, addr, out)
   541  }
   542  
   543  func PtracePeekData(pid int, addr uintptr, out []byte) (count int, err error) {
   544  	return ptracePeek(pid, addr, out)
   545  }
   546  
   547  func ptracePoke(pid int, addr uintptr, data []byte) (count int, err error) {
   548  	n := 0
   549  	for len(data) > 0 {
   550  		bsize := len(data)
   551  		if bsize > 1024 {
   552  			bsize = 1024
   553  		}
   554  		err = ptrace64Ptr(PT_WRITE_BLOCK, int64(pid), int64(addr), bsize, unsafe.Pointer(&data[0]))
   555  		if err != nil {
   556  			return 0, err
   557  		}
   558  		addr += uintptr(bsize)
   559  		n += bsize
   560  		data = data[n:]
   561  	}
   562  	return n, nil
   563  }
   564  
   565  func PtracePokeText(pid int, addr uintptr, data []byte) (count int, err error) {
   566  	return ptracePoke(pid, addr, data)
   567  }
   568  
   569  func PtracePokeData(pid int, addr uintptr, data []byte) (count int, err error) {
   570  	return ptracePoke(pid, addr, data)
   571  }
   572  
   573  func PtraceCont(pid int, signal int) (err error) {
   574  	return ptrace64(PT_CONTINUE, int64(pid), 1, signal, 0)
   575  }
   576  
   577  func PtraceSingleStep(pid int) (err error) { return ptrace64(PT_STEP, int64(pid), 1, 0, 0) }
   578  
   579  func PtraceAttach(pid int) (err error) { return ptrace64(PT_ATTACH, int64(pid), 0, 0, 0) }
   580  
   581  func PtraceDetach(pid int) (err error) { return ptrace64(PT_DETACH, int64(pid), 0, 0, 0) }
   582  
   583  /*
   584   * Direct access
   585   */
   586  
   587  //sys	Acct(path string) (err error)
   588  //sys	Chdir(path string) (err error)
   589  //sys	Chmod(path string, mode uint32) (err error)
   590  //sys	Chown(path string, uid int, gid int) (err error)
   591  //sys	Chroot(path string) (err error)
   592  //sys	Close(fd int) (err error)
   593  //sys	Dup(fd int) (nfd int, err error)
   594  //sys	Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
   595  //sys	Fchdir(fd int) (err error)
   596  //sys	Fchmod(fd int, mode uint32) (err error)
   597  //sys	Fchmodat(dirfd int, path string, mode uint32, flags int) (err error)
   598  //sys	Fchown(fd int, uid int, gid int) (err error)
   599  //sys	Fchownat(dirfd int, path string, uid int, gid int, flags int) (err error)
   600  //sys	Fpathconf(fd int, name int) (val int, err error)
   601  //sys	Fstat(fd int, stat *Stat_t) (err error)
   602  //sys	Fstatfs(fd int, buf *Statfs_t) (err error)
   603  //sys	Ftruncate(fd int, length int64) (err error)
   604  //sysnb	Getgid() (gid int)
   605  //sysnb	Getpid() (pid int)
   606  //sys	Geteuid() (euid int)
   607  //sys	Getegid() (egid int)
   608  //sys	Getppid() (ppid int)
   609  //sys	Getpriority(which int, who int) (n int, err error)
   610  //sysnb	Getrlimit(which int, lim *Rlimit) (err error)
   611  //sysnb	Getrusage(who int, rusage *Rusage) (err error)
   612  //sysnb	Getuid() (uid int)
   613  //sys	Kill(pid int, signum Signal) (err error)
   614  //sys	Lchown(path string, uid int, gid int) (err error)
   615  //sys	Link(path string, link string) (err error)
   616  //sys	Lstat(path string, stat *Stat_t) (err error)
   617  //sys	Mkdir(path string, mode uint32) (err error)
   618  //sys	Mkdirat(dirfd int, path string, mode uint32) (err error)
   619  //sys	Mknodat(dirfd int, path string, mode uint32, dev int) (err error)
   620  //sys	Open(path string, mode int, perm uint32) (fd int, err error)
   621  //sys	pread(fd int, p []byte, offset int64) (n int, err error)
   622  //sys	pwrite(fd int, p []byte, offset int64) (n int, err error)
   623  //sys	read(fd int, p []byte) (n int, err error)
   624  //sys	Reboot(how int) (err error)
   625  //sys	Rename(from string, to string) (err error)
   626  //sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
   627  //sys	Rmdir(path string) (err error)
   628  //sys	Seek(fd int, offset int64, whence int) (newoffset int64, err error) = lseek
   629  //sysnb	Setegid(egid int) (err error)
   630  //sysnb	Seteuid(euid int) (err error)
   631  //sysnb	Setgid(gid int) (err error)
   632  //sysnb	Setuid(uid int) (err error)
   633  //sysnb	Setpgid(pid int, pgid int) (err error)
   634  //sys	Setpriority(which int, who int, prio int) (err error)
   635  //sysnb	Setregid(rgid int, egid int) (err error)
   636  //sysnb	Setreuid(ruid int, euid int) (err error)
   637  //sysnb	setrlimit(which int, lim *Rlimit) (err error)
   638  //sys	Stat(path string, stat *Stat_t) (err error)
   639  //sys	Statfs(path string, buf *Statfs_t) (err error)
   640  //sys	Symlink(path string, link string) (err error)
   641  //sys	Truncate(path string, length int64) (err error)
   642  //sys	Umask(newmask int) (oldmask int)
   643  //sys	Unlink(path string) (err error)
   644  //sysnb	Uname(buf *Utsname) (err error)
   645  //sys	write(fd int, p []byte) (n int, err error)
   646  //sys	writev(fd int, iovecs []Iovec) (n uintptr, err error)
   647  
   648  //sys	gettimeofday(tv *Timeval, tzp *Timezone) (err error)
   649  
   650  func setTimespec(sec, nsec int64) Timespec {
   651  	return Timespec{Sec: sec, Nsec: nsec}
   652  }
   653  
   654  func setTimeval(sec, usec int64) Timeval {
   655  	return Timeval{Sec: sec, Usec: int32(usec)}
   656  }
   657  
   658  func readlen(fd int, buf *byte, nbuf int) (n int, err error) {
   659  	r0, _, e1 := syscall6(uintptr(unsafe.Pointer(&libc_read)), 3, uintptr(fd), uintptr(unsafe.Pointer(buf)), uintptr(nbuf), 0, 0, 0)
   660  	n = int(r0)
   661  	if e1 != 0 {
   662  		err = e1
   663  	}
   664  	return
   665  }
   666  
   667  /*
   668   * Map
   669   */
   670  
   671  var mapper = &mmapper{
   672  	active: make(map[*byte][]byte),
   673  	mmap:   mmap,
   674  	munmap: munmap,
   675  }
   676  
   677  //sys	mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
   678  //sys	munmap(addr uintptr, length uintptr) (err error)
   679  
   680  func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
   681  	return mapper.Mmap(fd, offset, length, prot, flags)
   682  }
   683  
   684  func Munmap(b []byte) (err error) {
   685  	return mapper.Munmap(b)
   686  }
   687  

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