syscall_bsd.go

     1  // Copyright 2009 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 darwin || dragonfly || freebsd || netbsd || openbsd
     6  // +build darwin dragonfly freebsd netbsd openbsd
     7  
     8  // BSD system call wrappers shared by *BSD based systems
     9  // including OS X (Darwin) and FreeBSD.  Like the other
    10  // syscall_*.go files it is compiled as Go code but also
    11  // used as input to mksyscall which parses the //sys
    12  // lines and generates system call stubs.
    13  
    14  package unix
    15  
    16  import (
    17  	"runtime"
    18  	"syscall"
    19  	"unsafe"
    20  )
    21  
    22  const ImplementsGetwd = true
    23  
    24  func Getwd() (string, error) {
    25  	var buf [PathMax]byte
    26  	_, err := Getcwd(buf[0:])
    27  	if err != nil {
    28  		return "", err
    29  	}
    30  	n := clen(buf[:])
    31  	if n < 1 {
    32  		return "", EINVAL
    33  	}
    34  	return string(buf[:n]), nil
    35  }
    36  
    37  /*
    38   * Wrapped
    39   */
    40  
    41  //sysnb	getgroups(ngid int, gid *_Gid_t) (n int, err error)
    42  //sysnb	setgroups(ngid int, gid *_Gid_t) (err error)
    43  
    44  func Getgroups() (gids []int, err error) {
    45  	n, err := getgroups(0, nil)
    46  	if err != nil {
    47  		return nil, err
    48  	}
    49  	if n == 0 {
    50  		return nil, nil
    51  	}
    52  
    53  	// Sanity check group count. Max is 16 on BSD.
    54  	if n < 0 || n > 1000 {
    55  		return nil, EINVAL
    56  	}
    57  
    58  	a := make([]_Gid_t, n)
    59  	n, err = getgroups(n, &a[0])
    60  	if err != nil {
    61  		return nil, err
    62  	}
    63  	gids = make([]int, n)
    64  	for i, v := range a[0:n] {
    65  		gids[i] = int(v)
    66  	}
    67  	return
    68  }
    69  
    70  func Setgroups(gids []int) (err error) {
    71  	if len(gids) == 0 {
    72  		return setgroups(0, nil)
    73  	}
    74  
    75  	a := make([]_Gid_t, len(gids))
    76  	for i, v := range gids {
    77  		a[i] = _Gid_t(v)
    78  	}
    79  	return setgroups(len(a), &a[0])
    80  }
    81  
    82  // Wait status is 7 bits at bottom, either 0 (exited),
    83  // 0x7F (stopped), or a signal number that caused an exit.
    84  // The 0x80 bit is whether there was a core dump.
    85  // An extra number (exit code, signal causing a stop)
    86  // is in the high bits.
    87  
    88  type WaitStatus uint32
    89  
    90  const (
    91  	mask  = 0x7F
    92  	core  = 0x80
    93  	shift = 8
    94  
    95  	exited  = 0
    96  	killed  = 9
    97  	stopped = 0x7F
    98  )
    99  
   100  func (w WaitStatus) Exited() bool { return w&mask == exited }
   101  
   102  func (w WaitStatus) ExitStatus() int {
   103  	if w&mask != exited {
   104  		return -1
   105  	}
   106  	return int(w >> shift)
   107  }
   108  
   109  func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != 0 }
   110  
   111  func (w WaitStatus) Signal() syscall.Signal {
   112  	sig := syscall.Signal(w & mask)
   113  	if sig == stopped || sig == 0 {
   114  		return -1
   115  	}
   116  	return sig
   117  }
   118  
   119  func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
   120  
   121  func (w WaitStatus) Stopped() bool { return w&mask == stopped && syscall.Signal(w>>shift) != SIGSTOP }
   122  
   123  func (w WaitStatus) Killed() bool { return w&mask == killed && syscall.Signal(w>>shift) != SIGKILL }
   124  
   125  func (w WaitStatus) Continued() bool { return w&mask == stopped && syscall.Signal(w>>shift) == SIGSTOP }
   126  
   127  func (w WaitStatus) StopSignal() syscall.Signal {
   128  	if !w.Stopped() {
   129  		return -1
   130  	}
   131  	return syscall.Signal(w>>shift) & 0xFF
   132  }
   133  
   134  func (w WaitStatus) TrapCause() int { return -1 }
   135  
   136  //sys	wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error)
   137  
   138  func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
   139  	var status _C_int
   140  	wpid, err = wait4(pid, &status, options, rusage)
   141  	if wstatus != nil {
   142  		*wstatus = WaitStatus(status)
   143  	}
   144  	return
   145  }
   146  
   147  //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
   148  //sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
   149  //sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
   150  //sysnb	socket(domain int, typ int, proto int) (fd int, err error)
   151  //sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
   152  //sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
   153  //sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
   154  //sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
   155  //sys	Shutdown(s int, how int) (err error)
   156  
   157  func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
   158  	if sa.Port < 0 || sa.Port > 0xFFFF {
   159  		return nil, 0, EINVAL
   160  	}
   161  	sa.raw.Len = SizeofSockaddrInet4
   162  	sa.raw.Family = AF_INET
   163  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
   164  	p[0] = byte(sa.Port >> 8)
   165  	p[1] = byte(sa.Port)
   166  	sa.raw.Addr = sa.Addr
   167  	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
   168  }
   169  
   170  func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
   171  	if sa.Port < 0 || sa.Port > 0xFFFF {
   172  		return nil, 0, EINVAL
   173  	}
   174  	sa.raw.Len = SizeofSockaddrInet6
   175  	sa.raw.Family = AF_INET6
   176  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
   177  	p[0] = byte(sa.Port >> 8)
   178  	p[1] = byte(sa.Port)
   179  	sa.raw.Scope_id = sa.ZoneId
   180  	sa.raw.Addr = sa.Addr
   181  	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
   182  }
   183  
   184  func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
   185  	name := sa.Name
   186  	n := len(name)
   187  	if n >= len(sa.raw.Path) || n == 0 {
   188  		return nil, 0, EINVAL
   189  	}
   190  	sa.raw.Len = byte(3 + n) // 2 for Family, Len; 1 for NUL
   191  	sa.raw.Family = AF_UNIX
   192  	for i := 0; i < n; i++ {
   193  		sa.raw.Path[i] = int8(name[i])
   194  	}
   195  	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
   196  }
   197  
   198  func (sa *SockaddrDatalink) sockaddr() (unsafe.Pointer, _Socklen, error) {
   199  	if sa.Index == 0 {
   200  		return nil, 0, EINVAL
   201  	}
   202  	sa.raw.Len = sa.Len
   203  	sa.raw.Family = AF_LINK
   204  	sa.raw.Index = sa.Index
   205  	sa.raw.Type = sa.Type
   206  	sa.raw.Nlen = sa.Nlen
   207  	sa.raw.Alen = sa.Alen
   208  	sa.raw.Slen = sa.Slen
   209  	sa.raw.Data = sa.Data
   210  	return unsafe.Pointer(&sa.raw), SizeofSockaddrDatalink, nil
   211  }
   212  
   213  func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
   214  	switch rsa.Addr.Family {
   215  	case AF_LINK:
   216  		pp := (*RawSockaddrDatalink)(unsafe.Pointer(rsa))
   217  		sa := new(SockaddrDatalink)
   218  		sa.Len = pp.Len
   219  		sa.Family = pp.Family
   220  		sa.Index = pp.Index
   221  		sa.Type = pp.Type
   222  		sa.Nlen = pp.Nlen
   223  		sa.Alen = pp.Alen
   224  		sa.Slen = pp.Slen
   225  		sa.Data = pp.Data
   226  		return sa, nil
   227  
   228  	case AF_UNIX:
   229  		pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
   230  		if pp.Len < 2 || pp.Len > SizeofSockaddrUnix {
   231  			return nil, EINVAL
   232  		}
   233  		sa := new(SockaddrUnix)
   234  
   235  		// Some BSDs include the trailing NUL in the length, whereas
   236  		// others do not. Work around this by subtracting the leading
   237  		// family and len. The path is then scanned to see if a NUL
   238  		// terminator still exists within the length.
   239  		n := int(pp.Len) - 2 // subtract leading Family, Len
   240  		for i := 0; i < n; i++ {
   241  			if pp.Path[i] == 0 {
   242  				// found early NUL; assume Len included the NUL
   243  				// or was overestimating.
   244  				n = i
   245  				break
   246  			}
   247  		}
   248  		bytes := (*[len(pp.Path)]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
   249  		sa.Name = string(bytes)
   250  		return sa, nil
   251  
   252  	case AF_INET:
   253  		pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
   254  		sa := new(SockaddrInet4)
   255  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   256  		sa.Port = int(p[0])<<8 + int(p[1])
   257  		sa.Addr = pp.Addr
   258  		return sa, nil
   259  
   260  	case AF_INET6:
   261  		pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
   262  		sa := new(SockaddrInet6)
   263  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   264  		sa.Port = int(p[0])<<8 + int(p[1])
   265  		sa.ZoneId = pp.Scope_id
   266  		sa.Addr = pp.Addr
   267  		return sa, nil
   268  	}
   269  	return anyToSockaddrGOOS(fd, rsa)
   270  }
   271  
   272  func Accept(fd int) (nfd int, sa Sockaddr, err error) {
   273  	var rsa RawSockaddrAny
   274  	var len _Socklen = SizeofSockaddrAny
   275  	nfd, err = accept(fd, &rsa, &len)
   276  	if err != nil {
   277  		return
   278  	}
   279  	if (runtime.GOOS == "darwin" || runtime.GOOS == "ios") && len == 0 {
   280  		// Accepted socket has no address.
   281  		// This is likely due to a bug in xnu kernels,
   282  		// where instead of ECONNABORTED error socket
   283  		// is accepted, but has no address.
   284  		Close(nfd)
   285  		return 0, nil, ECONNABORTED
   286  	}
   287  	sa, err = anyToSockaddr(fd, &rsa)
   288  	if err != nil {
   289  		Close(nfd)
   290  		nfd = 0
   291  	}
   292  	return
   293  }
   294  
   295  func Getsockname(fd int) (sa Sockaddr, err error) {
   296  	var rsa RawSockaddrAny
   297  	var len _Socklen = SizeofSockaddrAny
   298  	if err = getsockname(fd, &rsa, &len); err != nil {
   299  		return
   300  	}
   301  	// TODO(jsing): DragonFly has a "bug" (see issue 3349), which should be
   302  	// reported upstream.
   303  	if runtime.GOOS == "dragonfly" && rsa.Addr.Family == AF_UNSPEC && rsa.Addr.Len == 0 {
   304  		rsa.Addr.Family = AF_UNIX
   305  		rsa.Addr.Len = SizeofSockaddrUnix
   306  	}
   307  	return anyToSockaddr(fd, &rsa)
   308  }
   309  
   310  //sysnb	socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
   311  
   312  // GetsockoptString returns the string value of the socket option opt for the
   313  // socket associated with fd at the given socket level.
   314  func GetsockoptString(fd, level, opt int) (string, error) {
   315  	buf := make([]byte, 256)
   316  	vallen := _Socklen(len(buf))
   317  	err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
   318  	if err != nil {
   319  		return "", err
   320  	}
   321  	return string(buf[:vallen-1]), nil
   322  }
   323  
   324  //sys	recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
   325  //sys	sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
   326  //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
   327  
   328  func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
   329  	var msg Msghdr
   330  	var rsa RawSockaddrAny
   331  	msg.Name = (*byte)(unsafe.Pointer(&rsa))
   332  	msg.Namelen = uint32(SizeofSockaddrAny)
   333  	var iov Iovec
   334  	if len(p) > 0 {
   335  		iov.Base = (*byte)(unsafe.Pointer(&p[0]))
   336  		iov.SetLen(len(p))
   337  	}
   338  	var dummy byte
   339  	if len(oob) > 0 {
   340  		// receive at least one normal byte
   341  		if len(p) == 0 {
   342  			iov.Base = &dummy
   343  			iov.SetLen(1)
   344  		}
   345  		msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
   346  		msg.SetControllen(len(oob))
   347  	}
   348  	msg.Iov = &iov
   349  	msg.Iovlen = 1
   350  	if n, err = recvmsg(fd, &msg, flags); err != nil {
   351  		return
   352  	}
   353  	oobn = int(msg.Controllen)
   354  	recvflags = int(msg.Flags)
   355  	// source address is only specified if the socket is unconnected
   356  	if rsa.Addr.Family != AF_UNSPEC {
   357  		from, err = anyToSockaddr(fd, &rsa)
   358  	}
   359  	return
   360  }
   361  
   362  //sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
   363  
   364  func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
   365  	_, err = SendmsgN(fd, p, oob, to, flags)
   366  	return
   367  }
   368  
   369  func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
   370  	var ptr unsafe.Pointer
   371  	var salen _Socklen
   372  	if to != nil {
   373  		ptr, salen, err = to.sockaddr()
   374  		if err != nil {
   375  			return 0, err
   376  		}
   377  	}
   378  	var msg Msghdr
   379  	msg.Name = (*byte)(unsafe.Pointer(ptr))
   380  	msg.Namelen = uint32(salen)
   381  	var iov Iovec
   382  	if len(p) > 0 {
   383  		iov.Base = (*byte)(unsafe.Pointer(&p[0]))
   384  		iov.SetLen(len(p))
   385  	}
   386  	var dummy byte
   387  	if len(oob) > 0 {
   388  		// send at least one normal byte
   389  		if len(p) == 0 {
   390  			iov.Base = &dummy
   391  			iov.SetLen(1)
   392  		}
   393  		msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
   394  		msg.SetControllen(len(oob))
   395  	}
   396  	msg.Iov = &iov
   397  	msg.Iovlen = 1
   398  	if n, err = sendmsg(fd, &msg, flags); err != nil {
   399  		return 0, err
   400  	}
   401  	if len(oob) > 0 && len(p) == 0 {
   402  		n = 0
   403  	}
   404  	return n, nil
   405  }
   406  
   407  //sys	kevent(kq int, change unsafe.Pointer, nchange int, event unsafe.Pointer, nevent int, timeout *Timespec) (n int, err error)
   408  
   409  func Kevent(kq int, changes, events []Kevent_t, timeout *Timespec) (n int, err error) {
   410  	var change, event unsafe.Pointer
   411  	if len(changes) > 0 {
   412  		change = unsafe.Pointer(&changes[0])
   413  	}
   414  	if len(events) > 0 {
   415  		event = unsafe.Pointer(&events[0])
   416  	}
   417  	return kevent(kq, change, len(changes), event, len(events), timeout)
   418  }
   419  
   420  // sysctlmib translates name to mib number and appends any additional args.
   421  func sysctlmib(name string, args ...int) ([]_C_int, error) {
   422  	// Translate name to mib number.
   423  	mib, err := nametomib(name)
   424  	if err != nil {
   425  		return nil, err
   426  	}
   427  
   428  	for _, a := range args {
   429  		mib = append(mib, _C_int(a))
   430  	}
   431  
   432  	return mib, nil
   433  }
   434  
   435  func Sysctl(name string) (string, error) {
   436  	return SysctlArgs(name)
   437  }
   438  
   439  func SysctlArgs(name string, args ...int) (string, error) {
   440  	buf, err := SysctlRaw(name, args...)
   441  	if err != nil {
   442  		return "", err
   443  	}
   444  	n := len(buf)
   445  
   446  	// Throw away terminating NUL.
   447  	if n > 0 && buf[n-1] == '\x00' {
   448  		n--
   449  	}
   450  	return string(buf[0:n]), nil
   451  }
   452  
   453  func SysctlUint32(name string) (uint32, error) {
   454  	return SysctlUint32Args(name)
   455  }
   456  
   457  func SysctlUint32Args(name string, args ...int) (uint32, error) {
   458  	mib, err := sysctlmib(name, args...)
   459  	if err != nil {
   460  		return 0, err
   461  	}
   462  
   463  	n := uintptr(4)
   464  	buf := make([]byte, 4)
   465  	if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
   466  		return 0, err
   467  	}
   468  	if n != 4 {
   469  		return 0, EIO
   470  	}
   471  	return *(*uint32)(unsafe.Pointer(&buf[0])), nil
   472  }
   473  
   474  func SysctlUint64(name string, args ...int) (uint64, error) {
   475  	mib, err := sysctlmib(name, args...)
   476  	if err != nil {
   477  		return 0, err
   478  	}
   479  
   480  	n := uintptr(8)
   481  	buf := make([]byte, 8)
   482  	if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
   483  		return 0, err
   484  	}
   485  	if n != 8 {
   486  		return 0, EIO
   487  	}
   488  	return *(*uint64)(unsafe.Pointer(&buf[0])), nil
   489  }
   490  
   491  func SysctlRaw(name string, args ...int) ([]byte, error) {
   492  	mib, err := sysctlmib(name, args...)
   493  	if err != nil {
   494  		return nil, err
   495  	}
   496  
   497  	// Find size.
   498  	n := uintptr(0)
   499  	if err := sysctl(mib, nil, &n, nil, 0); err != nil {
   500  		return nil, err
   501  	}
   502  	if n == 0 {
   503  		return nil, nil
   504  	}
   505  
   506  	// Read into buffer of that size.
   507  	buf := make([]byte, n)
   508  	if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
   509  		return nil, err
   510  	}
   511  
   512  	// The actual call may return less than the original reported required
   513  	// size so ensure we deal with that.
   514  	return buf[:n], nil
   515  }
   516  
   517  func SysctlClockinfo(name string) (*Clockinfo, error) {
   518  	mib, err := sysctlmib(name)
   519  	if err != nil {
   520  		return nil, err
   521  	}
   522  
   523  	n := uintptr(SizeofClockinfo)
   524  	var ci Clockinfo
   525  	if err := sysctl(mib, (*byte)(unsafe.Pointer(&ci)), &n, nil, 0); err != nil {
   526  		return nil, err
   527  	}
   528  	if n != SizeofClockinfo {
   529  		return nil, EIO
   530  	}
   531  	return &ci, nil
   532  }
   533  
   534  func SysctlTimeval(name string) (*Timeval, error) {
   535  	mib, err := sysctlmib(name)
   536  	if err != nil {
   537  		return nil, err
   538  	}
   539  
   540  	var tv Timeval
   541  	n := uintptr(unsafe.Sizeof(tv))
   542  	if err := sysctl(mib, (*byte)(unsafe.Pointer(&tv)), &n, nil, 0); err != nil {
   543  		return nil, err
   544  	}
   545  	if n != unsafe.Sizeof(tv) {
   546  		return nil, EIO
   547  	}
   548  	return &tv, nil
   549  }
   550  
   551  //sys	utimes(path string, timeval *[2]Timeval) (err error)
   552  
   553  func Utimes(path string, tv []Timeval) error {
   554  	if tv == nil {
   555  		return utimes(path, nil)
   556  	}
   557  	if len(tv) != 2 {
   558  		return EINVAL
   559  	}
   560  	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
   561  }
   562  
   563  func UtimesNano(path string, ts []Timespec) error {
   564  	if ts == nil {
   565  		err := utimensat(AT_FDCWD, path, nil, 0)
   566  		if err != ENOSYS {
   567  			return err
   568  		}
   569  		return utimes(path, nil)
   570  	}
   571  	if len(ts) != 2 {
   572  		return EINVAL
   573  	}
   574  	// Darwin setattrlist can set nanosecond timestamps
   575  	err := setattrlistTimes(path, ts, 0)
   576  	if err != ENOSYS {
   577  		return err
   578  	}
   579  	err = utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
   580  	if err != ENOSYS {
   581  		return err
   582  	}
   583  	// Not as efficient as it could be because Timespec and
   584  	// Timeval have different types in the different OSes
   585  	tv := [2]Timeval{
   586  		NsecToTimeval(TimespecToNsec(ts[0])),
   587  		NsecToTimeval(TimespecToNsec(ts[1])),
   588  	}
   589  	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
   590  }
   591  
   592  func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error {
   593  	if ts == nil {
   594  		return utimensat(dirfd, path, nil, flags)
   595  	}
   596  	if len(ts) != 2 {
   597  		return EINVAL
   598  	}
   599  	err := setattrlistTimes(path, ts, flags)
   600  	if err != ENOSYS {
   601  		return err
   602  	}
   603  	return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags)
   604  }
   605  
   606  //sys	futimes(fd int, timeval *[2]Timeval) (err error)
   607  
   608  func Futimes(fd int, tv []Timeval) error {
   609  	if tv == nil {
   610  		return futimes(fd, nil)
   611  	}
   612  	if len(tv) != 2 {
   613  		return EINVAL
   614  	}
   615  	return futimes(fd, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
   616  }
   617  
   618  //sys	poll(fds *PollFd, nfds int, timeout int) (n int, err error)
   619  
   620  func Poll(fds []PollFd, timeout int) (n int, err error) {
   621  	if len(fds) == 0 {
   622  		return poll(nil, 0, timeout)
   623  	}
   624  	return poll(&fds[0], len(fds), timeout)
   625  }
   626  
   627  // TODO: wrap
   628  //	Acct(name nil-string) (err error)
   629  //	Gethostuuid(uuid *byte, timeout *Timespec) (err error)
   630  //	Ptrace(req int, pid int, addr uintptr, data int) (ret uintptr, err error)
   631  
   632  var mapper = &mmapper{
   633  	active: make(map[*byte][]byte),
   634  	mmap:   mmap,
   635  	munmap: munmap,
   636  }
   637  
   638  func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
   639  	return mapper.Mmap(fd, offset, length, prot, flags)
   640  }
   641  
   642  func Munmap(b []byte) (err error) {
   643  	return mapper.Munmap(b)
   644  }
   645  
   646  //sys	Madvise(b []byte, behav int) (err error)
   647  //sys	Mlock(b []byte) (err error)
   648  //sys	Mlockall(flags int) (err error)
   649  //sys	Mprotect(b []byte, prot int) (err error)
   650  //sys	Msync(b []byte, flags int) (err error)
   651  //sys	Munlock(b []byte) (err error)
   652  //sys	Munlockall() (err error)
   653
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