github.com/Andyfoo/golang/x/sys@v0.0.0-20190901054642-57c1bf301704/unix/syscall_bsd.go (about)

     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  // +build darwin dragonfly freebsd netbsd openbsd
     6  
     7  // BSD system call wrappers shared by *BSD based systems
     8  // including OS X (Darwin) and FreeBSD.  Like the other
     9  // syscall_*.go files it is compiled as Go code but also
    10  // used as input to mksyscall which parses the //sys
    11  // lines and generates system call stubs.
    12  
    13  package unix
    14  
    15  import (
    16  	"runtime"
    17  	"syscall"
    18  	"unsafe"
    19  )
    20  
    21  /*
    22   * Wrapped
    23   */
    24  
    25  //sysnb	getgroups(ngid int, gid *_Gid_t) (n int, err error)
    26  //sysnb	setgroups(ngid int, gid *_Gid_t) (err error)
    27  
    28  func Getgroups() (gids []int, err error) {
    29  	n, err := getgroups(0, nil)
    30  	if err != nil {
    31  		return nil, err
    32  	}
    33  	if n == 0 {
    34  		return nil, nil
    35  	}
    36  
    37  	// Sanity check group count. Max is 16 on BSD.
    38  	if n < 0 || n > 1000 {
    39  		return nil, EINVAL
    40  	}
    41  
    42  	a := make([]_Gid_t, n)
    43  	n, err = getgroups(n, &a[0])
    44  	if err != nil {
    45  		return nil, err
    46  	}
    47  	gids = make([]int, n)
    48  	for i, v := range a[0:n] {
    49  		gids[i] = int(v)
    50  	}
    51  	return
    52  }
    53  
    54  func Setgroups(gids []int) (err error) {
    55  	if len(gids) == 0 {
    56  		return setgroups(0, nil)
    57  	}
    58  
    59  	a := make([]_Gid_t, len(gids))
    60  	for i, v := range gids {
    61  		a[i] = _Gid_t(v)
    62  	}
    63  	return setgroups(len(a), &a[0])
    64  }
    65  
    66  // Wait status is 7 bits at bottom, either 0 (exited),
    67  // 0x7F (stopped), or a signal number that caused an exit.
    68  // The 0x80 bit is whether there was a core dump.
    69  // An extra number (exit code, signal causing a stop)
    70  // is in the high bits.
    71  
    72  type WaitStatus uint32
    73  
    74  const (
    75  	mask  = 0x7F
    76  	core  = 0x80
    77  	shift = 8
    78  
    79  	exited  = 0
    80  	killed  = 9
    81  	stopped = 0x7F
    82  )
    83  
    84  func (w WaitStatus) Exited() bool { return w&mask == exited }
    85  
    86  func (w WaitStatus) ExitStatus() int {
    87  	if w&mask != exited {
    88  		return -1
    89  	}
    90  	return int(w >> shift)
    91  }
    92  
    93  func (w WaitStatus) Signaled() bool { return w&mask != stopped && w&mask != 0 }
    94  
    95  func (w WaitStatus) Signal() syscall.Signal {
    96  	sig := syscall.Signal(w & mask)
    97  	if sig == stopped || sig == 0 {
    98  		return -1
    99  	}
   100  	return sig
   101  }
   102  
   103  func (w WaitStatus) CoreDump() bool { return w.Signaled() && w&core != 0 }
   104  
   105  func (w WaitStatus) Stopped() bool { return w&mask == stopped && syscall.Signal(w>>shift) != SIGSTOP }
   106  
   107  func (w WaitStatus) Killed() bool { return w&mask == killed && syscall.Signal(w>>shift) != SIGKILL }
   108  
   109  func (w WaitStatus) Continued() bool { return w&mask == stopped && syscall.Signal(w>>shift) == SIGSTOP }
   110  
   111  func (w WaitStatus) StopSignal() syscall.Signal {
   112  	if !w.Stopped() {
   113  		return -1
   114  	}
   115  	return syscall.Signal(w>>shift) & 0xFF
   116  }
   117  
   118  func (w WaitStatus) TrapCause() int { return -1 }
   119  
   120  //sys	wait4(pid int, wstatus *_C_int, options int, rusage *Rusage) (wpid int, err error)
   121  
   122  func Wait4(pid int, wstatus *WaitStatus, options int, rusage *Rusage) (wpid int, err error) {
   123  	var status _C_int
   124  	wpid, err = wait4(pid, &status, options, rusage)
   125  	if wstatus != nil {
   126  		*wstatus = WaitStatus(status)
   127  	}
   128  	return
   129  }
   130  
   131  //sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)
   132  //sys	bind(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
   133  //sys	connect(s int, addr unsafe.Pointer, addrlen _Socklen) (err error)
   134  //sysnb	socket(domain int, typ int, proto int) (fd int, err error)
   135  //sys	getsockopt(s int, level int, name int, val unsafe.Pointer, vallen *_Socklen) (err error)
   136  //sys	setsockopt(s int, level int, name int, val unsafe.Pointer, vallen uintptr) (err error)
   137  //sysnb	getpeername(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
   138  //sysnb	getsockname(fd int, rsa *RawSockaddrAny, addrlen *_Socklen) (err error)
   139  //sys	Shutdown(s int, how int) (err error)
   140  
   141  func (sa *SockaddrInet4) sockaddr() (unsafe.Pointer, _Socklen, error) {
   142  	if sa.Port < 0 || sa.Port > 0xFFFF {
   143  		return nil, 0, EINVAL
   144  	}
   145  	sa.raw.Len = SizeofSockaddrInet4
   146  	sa.raw.Family = AF_INET
   147  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
   148  	p[0] = byte(sa.Port >> 8)
   149  	p[1] = byte(sa.Port)
   150  	for i := 0; i < len(sa.Addr); i++ {
   151  		sa.raw.Addr[i] = sa.Addr[i]
   152  	}
   153  	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
   154  }
   155  
   156  func (sa *SockaddrInet6) sockaddr() (unsafe.Pointer, _Socklen, error) {
   157  	if sa.Port < 0 || sa.Port > 0xFFFF {
   158  		return nil, 0, EINVAL
   159  	}
   160  	sa.raw.Len = SizeofSockaddrInet6
   161  	sa.raw.Family = AF_INET6
   162  	p := (*[2]byte)(unsafe.Pointer(&sa.raw.Port))
   163  	p[0] = byte(sa.Port >> 8)
   164  	p[1] = byte(sa.Port)
   165  	sa.raw.Scope_id = sa.ZoneId
   166  	for i := 0; i < len(sa.Addr); i++ {
   167  		sa.raw.Addr[i] = sa.Addr[i]
   168  	}
   169  	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
   170  }
   171  
   172  func (sa *SockaddrUnix) sockaddr() (unsafe.Pointer, _Socklen, error) {
   173  	name := sa.Name
   174  	n := len(name)
   175  	if n >= len(sa.raw.Path) || n == 0 {
   176  		return nil, 0, EINVAL
   177  	}
   178  	sa.raw.Len = byte(3 + n) // 2 for Family, Len; 1 for NUL
   179  	sa.raw.Family = AF_UNIX
   180  	for i := 0; i < n; i++ {
   181  		sa.raw.Path[i] = int8(name[i])
   182  	}
   183  	return unsafe.Pointer(&sa.raw), _Socklen(sa.raw.Len), nil
   184  }
   185  
   186  func (sa *SockaddrDatalink) sockaddr() (unsafe.Pointer, _Socklen, error) {
   187  	if sa.Index == 0 {
   188  		return nil, 0, EINVAL
   189  	}
   190  	sa.raw.Len = sa.Len
   191  	sa.raw.Family = AF_LINK
   192  	sa.raw.Index = sa.Index
   193  	sa.raw.Type = sa.Type
   194  	sa.raw.Nlen = sa.Nlen
   195  	sa.raw.Alen = sa.Alen
   196  	sa.raw.Slen = sa.Slen
   197  	for i := 0; i < len(sa.raw.Data); i++ {
   198  		sa.raw.Data[i] = sa.Data[i]
   199  	}
   200  	return unsafe.Pointer(&sa.raw), SizeofSockaddrDatalink, nil
   201  }
   202  
   203  func anyToSockaddr(fd int, rsa *RawSockaddrAny) (Sockaddr, error) {
   204  	switch rsa.Addr.Family {
   205  	case AF_LINK:
   206  		pp := (*RawSockaddrDatalink)(unsafe.Pointer(rsa))
   207  		sa := new(SockaddrDatalink)
   208  		sa.Len = pp.Len
   209  		sa.Family = pp.Family
   210  		sa.Index = pp.Index
   211  		sa.Type = pp.Type
   212  		sa.Nlen = pp.Nlen
   213  		sa.Alen = pp.Alen
   214  		sa.Slen = pp.Slen
   215  		for i := 0; i < len(sa.Data); i++ {
   216  			sa.Data[i] = pp.Data[i]
   217  		}
   218  		return sa, nil
   219  
   220  	case AF_UNIX:
   221  		pp := (*RawSockaddrUnix)(unsafe.Pointer(rsa))
   222  		if pp.Len < 2 || pp.Len > SizeofSockaddrUnix {
   223  			return nil, EINVAL
   224  		}
   225  		sa := new(SockaddrUnix)
   226  
   227  		// Some BSDs include the trailing NUL in the length, whereas
   228  		// others do not. Work around this by subtracting the leading
   229  		// family and len. The path is then scanned to see if a NUL
   230  		// terminator still exists within the length.
   231  		n := int(pp.Len) - 2 // subtract leading Family, Len
   232  		for i := 0; i < n; i++ {
   233  			if pp.Path[i] == 0 {
   234  				// found early NUL; assume Len included the NUL
   235  				// or was overestimating.
   236  				n = i
   237  				break
   238  			}
   239  		}
   240  		bytes := (*[10000]byte)(unsafe.Pointer(&pp.Path[0]))[0:n]
   241  		sa.Name = string(bytes)
   242  		return sa, nil
   243  
   244  	case AF_INET:
   245  		pp := (*RawSockaddrInet4)(unsafe.Pointer(rsa))
   246  		sa := new(SockaddrInet4)
   247  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   248  		sa.Port = int(p[0])<<8 + int(p[1])
   249  		for i := 0; i < len(sa.Addr); i++ {
   250  			sa.Addr[i] = pp.Addr[i]
   251  		}
   252  		return sa, nil
   253  
   254  	case AF_INET6:
   255  		pp := (*RawSockaddrInet6)(unsafe.Pointer(rsa))
   256  		sa := new(SockaddrInet6)
   257  		p := (*[2]byte)(unsafe.Pointer(&pp.Port))
   258  		sa.Port = int(p[0])<<8 + int(p[1])
   259  		sa.ZoneId = pp.Scope_id
   260  		for i := 0; i < len(sa.Addr); i++ {
   261  			sa.Addr[i] = pp.Addr[i]
   262  		}
   263  		return sa, nil
   264  	}
   265  	return nil, EAFNOSUPPORT
   266  }
   267  
   268  func Accept(fd int) (nfd int, sa Sockaddr, err error) {
   269  	var rsa RawSockaddrAny
   270  	var len _Socklen = SizeofSockaddrAny
   271  	nfd, err = accept(fd, &rsa, &len)
   272  	if err != nil {
   273  		return
   274  	}
   275  	if runtime.GOOS == "darwin" && len == 0 {
   276  		// Accepted socket has no address.
   277  		// This is likely due to a bug in xnu kernels,
   278  		// where instead of ECONNABORTED error socket
   279  		// is accepted, but has no address.
   280  		Close(nfd)
   281  		return 0, nil, ECONNABORTED
   282  	}
   283  	sa, err = anyToSockaddr(fd, &rsa)
   284  	if err != nil {
   285  		Close(nfd)
   286  		nfd = 0
   287  	}
   288  	return
   289  }
   290  
   291  func Getsockname(fd int) (sa Sockaddr, err error) {
   292  	var rsa RawSockaddrAny
   293  	var len _Socklen = SizeofSockaddrAny
   294  	if err = getsockname(fd, &rsa, &len); err != nil {
   295  		return
   296  	}
   297  	// TODO(jsing): DragonFly has a "bug" (see issue 3349), which should be
   298  	// reported upstream.
   299  	if runtime.GOOS == "dragonfly" && rsa.Addr.Family == AF_UNSPEC && rsa.Addr.Len == 0 {
   300  		rsa.Addr.Family = AF_UNIX
   301  		rsa.Addr.Len = SizeofSockaddrUnix
   302  	}
   303  	return anyToSockaddr(fd, &rsa)
   304  }
   305  
   306  //sysnb socketpair(domain int, typ int, proto int, fd *[2]int32) (err error)
   307  
   308  // GetsockoptString returns the string value of the socket option opt for the
   309  // socket associated with fd at the given socket level.
   310  func GetsockoptString(fd, level, opt int) (string, error) {
   311  	buf := make([]byte, 256)
   312  	vallen := _Socklen(len(buf))
   313  	err := getsockopt(fd, level, opt, unsafe.Pointer(&buf[0]), &vallen)
   314  	if err != nil {
   315  		return "", err
   316  	}
   317  	return string(buf[:vallen-1]), nil
   318  }
   319  
   320  //sys   recvfrom(fd int, p []byte, flags int, from *RawSockaddrAny, fromlen *_Socklen) (n int, err error)
   321  //sys   sendto(s int, buf []byte, flags int, to unsafe.Pointer, addrlen _Socklen) (err error)
   322  //sys	recvmsg(s int, msg *Msghdr, flags int) (n int, err error)
   323  
   324  func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
   325  	var msg Msghdr
   326  	var rsa RawSockaddrAny
   327  	msg.Name = (*byte)(unsafe.Pointer(&rsa))
   328  	msg.Namelen = uint32(SizeofSockaddrAny)
   329  	var iov Iovec
   330  	if len(p) > 0 {
   331  		iov.Base = (*byte)(unsafe.Pointer(&p[0]))
   332  		iov.SetLen(len(p))
   333  	}
   334  	var dummy byte
   335  	if len(oob) > 0 {
   336  		// receive at least one normal byte
   337  		if len(p) == 0 {
   338  			iov.Base = &dummy
   339  			iov.SetLen(1)
   340  		}
   341  		msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
   342  		msg.SetControllen(len(oob))
   343  	}
   344  	msg.Iov = &iov
   345  	msg.Iovlen = 1
   346  	if n, err = recvmsg(fd, &msg, flags); err != nil {
   347  		return
   348  	}
   349  	oobn = int(msg.Controllen)
   350  	recvflags = int(msg.Flags)
   351  	// source address is only specified if the socket is unconnected
   352  	if rsa.Addr.Family != AF_UNSPEC {
   353  		from, err = anyToSockaddr(fd, &rsa)
   354  	}
   355  	return
   356  }
   357  
   358  //sys	sendmsg(s int, msg *Msghdr, flags int) (n int, err error)
   359  
   360  func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
   361  	_, err = SendmsgN(fd, p, oob, to, flags)
   362  	return
   363  }
   364  
   365  func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
   366  	var ptr unsafe.Pointer
   367  	var salen _Socklen
   368  	if to != nil {
   369  		ptr, salen, err = to.sockaddr()
   370  		if err != nil {
   371  			return 0, err
   372  		}
   373  	}
   374  	var msg Msghdr
   375  	msg.Name = (*byte)(unsafe.Pointer(ptr))
   376  	msg.Namelen = uint32(salen)
   377  	var iov Iovec
   378  	if len(p) > 0 {
   379  		iov.Base = (*byte)(unsafe.Pointer(&p[0]))
   380  		iov.SetLen(len(p))
   381  	}
   382  	var dummy byte
   383  	if len(oob) > 0 {
   384  		// send at least one normal byte
   385  		if len(p) == 0 {
   386  			iov.Base = &dummy
   387  			iov.SetLen(1)
   388  		}
   389  		msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
   390  		msg.SetControllen(len(oob))
   391  	}
   392  	msg.Iov = &iov
   393  	msg.Iovlen = 1
   394  	if n, err = sendmsg(fd, &msg, flags); err != nil {
   395  		return 0, err
   396  	}
   397  	if len(oob) > 0 && len(p) == 0 {
   398  		n = 0
   399  	}
   400  	return n, nil
   401  }
   402  
   403  //sys	kevent(kq int, change unsafe.Pointer, nchange int, event unsafe.Pointer, nevent int, timeout *Timespec) (n int, err error)
   404  
   405  func Kevent(kq int, changes, events []Kevent_t, timeout *Timespec) (n int, err error) {
   406  	var change, event unsafe.Pointer
   407  	if len(changes) > 0 {
   408  		change = unsafe.Pointer(&changes[0])
   409  	}
   410  	if len(events) > 0 {
   411  		event = unsafe.Pointer(&events[0])
   412  	}
   413  	return kevent(kq, change, len(changes), event, len(events), timeout)
   414  }
   415  
   416  //sys	sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL
   417  
   418  // sysctlmib translates name to mib number and appends any additional args.
   419  func sysctlmib(name string, args ...int) ([]_C_int, error) {
   420  	// Translate name to mib number.
   421  	mib, err := nametomib(name)
   422  	if err != nil {
   423  		return nil, err
   424  	}
   425  
   426  	for _, a := range args {
   427  		mib = append(mib, _C_int(a))
   428  	}
   429  
   430  	return mib, nil
   431  }
   432  
   433  func Sysctl(name string) (string, error) {
   434  	return SysctlArgs(name)
   435  }
   436  
   437  func SysctlArgs(name string, args ...int) (string, error) {
   438  	buf, err := SysctlRaw(name, args...)
   439  	if err != nil {
   440  		return "", err
   441  	}
   442  	n := len(buf)
   443  
   444  	// Throw away terminating NUL.
   445  	if n > 0 && buf[n-1] == '\x00' {
   446  		n--
   447  	}
   448  	return string(buf[0:n]), nil
   449  }
   450  
   451  func SysctlUint32(name string) (uint32, error) {
   452  	return SysctlUint32Args(name)
   453  }
   454  
   455  func SysctlUint32Args(name string, args ...int) (uint32, error) {
   456  	mib, err := sysctlmib(name, args...)
   457  	if err != nil {
   458  		return 0, err
   459  	}
   460  
   461  	n := uintptr(4)
   462  	buf := make([]byte, 4)
   463  	if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
   464  		return 0, err
   465  	}
   466  	if n != 4 {
   467  		return 0, EIO
   468  	}
   469  	return *(*uint32)(unsafe.Pointer(&buf[0])), nil
   470  }
   471  
   472  func SysctlUint64(name string, args ...int) (uint64, error) {
   473  	mib, err := sysctlmib(name, args...)
   474  	if err != nil {
   475  		return 0, err
   476  	}
   477  
   478  	n := uintptr(8)
   479  	buf := make([]byte, 8)
   480  	if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
   481  		return 0, err
   482  	}
   483  	if n != 8 {
   484  		return 0, EIO
   485  	}
   486  	return *(*uint64)(unsafe.Pointer(&buf[0])), nil
   487  }
   488  
   489  func SysctlRaw(name string, args ...int) ([]byte, error) {
   490  	mib, err := sysctlmib(name, args...)
   491  	if err != nil {
   492  		return nil, err
   493  	}
   494  
   495  	// Find size.
   496  	n := uintptr(0)
   497  	if err := sysctl(mib, nil, &n, nil, 0); err != nil {
   498  		return nil, err
   499  	}
   500  	if n == 0 {
   501  		return nil, nil
   502  	}
   503  
   504  	// Read into buffer of that size.
   505  	buf := make([]byte, n)
   506  	if err := sysctl(mib, &buf[0], &n, nil, 0); err != nil {
   507  		return nil, err
   508  	}
   509  
   510  	// The actual call may return less than the original reported required
   511  	// size so ensure we deal with that.
   512  	return buf[:n], nil
   513  }
   514  
   515  //sys	utimes(path string, timeval *[2]Timeval) (err error)
   516  
   517  func Utimes(path string, tv []Timeval) error {
   518  	if tv == nil {
   519  		return utimes(path, nil)
   520  	}
   521  	if len(tv) != 2 {
   522  		return EINVAL
   523  	}
   524  	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
   525  }
   526  
   527  func UtimesNano(path string, ts []Timespec) error {
   528  	if ts == nil {
   529  		err := utimensat(AT_FDCWD, path, nil, 0)
   530  		if err != ENOSYS {
   531  			return err
   532  		}
   533  		return utimes(path, nil)
   534  	}
   535  	if len(ts) != 2 {
   536  		return EINVAL
   537  	}
   538  	// Darwin setattrlist can set nanosecond timestamps
   539  	err := setattrlistTimes(path, ts, 0)
   540  	if err != ENOSYS {
   541  		return err
   542  	}
   543  	err = utimensat(AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
   544  	if err != ENOSYS {
   545  		return err
   546  	}
   547  	// Not as efficient as it could be because Timespec and
   548  	// Timeval have different types in the different OSes
   549  	tv := [2]Timeval{
   550  		NsecToTimeval(TimespecToNsec(ts[0])),
   551  		NsecToTimeval(TimespecToNsec(ts[1])),
   552  	}
   553  	return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
   554  }
   555  
   556  func UtimesNanoAt(dirfd int, path string, ts []Timespec, flags int) error {
   557  	if ts == nil {
   558  		return utimensat(dirfd, path, nil, flags)
   559  	}
   560  	if len(ts) != 2 {
   561  		return EINVAL
   562  	}
   563  	err := setattrlistTimes(path, ts, flags)
   564  	if err != ENOSYS {
   565  		return err
   566  	}
   567  	return utimensat(dirfd, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), flags)
   568  }
   569  
   570  //sys	futimes(fd int, timeval *[2]Timeval) (err error)
   571  
   572  func Futimes(fd int, tv []Timeval) error {
   573  	if tv == nil {
   574  		return futimes(fd, nil)
   575  	}
   576  	if len(tv) != 2 {
   577  		return EINVAL
   578  	}
   579  	return futimes(fd, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
   580  }
   581  
   582  //sys	fcntl(fd int, cmd int, arg int) (val int, err error)
   583  
   584  //sys   poll(fds *PollFd, nfds int, timeout int) (n int, err error)
   585  
   586  func Poll(fds []PollFd, timeout int) (n int, err error) {
   587  	if len(fds) == 0 {
   588  		return poll(nil, 0, timeout)
   589  	}
   590  	return poll(&fds[0], len(fds), timeout)
   591  }
   592  
   593  // TODO: wrap
   594  //	Acct(name nil-string) (err error)
   595  //	Gethostuuid(uuid *byte, timeout *Timespec) (err error)
   596  //	Ptrace(req int, pid int, addr uintptr, data int) (ret uintptr, err error)
   597  
   598  var mapper = &mmapper{
   599  	active: make(map[*byte][]byte),
   600  	mmap:   mmap,
   601  	munmap: munmap,
   602  }
   603  
   604  func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
   605  	return mapper.Mmap(fd, offset, length, prot, flags)
   606  }
   607  
   608  func Munmap(b []byte) (err error) {
   609  	return mapper.Munmap(b)
   610  }
   611  
   612  //sys	Madvise(b []byte, behav int) (err error)
   613  //sys	Mlock(b []byte) (err error)
   614  //sys	Mlockall(flags int) (err error)
   615  //sys	Mprotect(b []byte, prot int) (err error)
   616  //sys	Msync(b []byte, flags int) (err error)
   617  //sys	Munlock(b []byte) (err error)
   618  //sys	Munlockall() (err error)