syscall_unix.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 aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
     6  
     7  package unix
     8  
     9  import (
    10  	"bytes"
    11  	"sort"
    12  	"sync"
    13  	"syscall"
    14  	"unsafe"
    15  )
    16  
    17  var (
    18  	Stdin  = 0
    19  	Stdout = 1
    20  	Stderr = 2
    21  )
    22  
    23  // Do the interface allocations only once for common
    24  // Errno values.
    25  var (
    26  	errEAGAIN error = syscall.EAGAIN
    27  	errEINVAL error = syscall.EINVAL
    28  	errENOENT error = syscall.ENOENT
    29  )
    30  
    31  var (
    32  	signalNameMapOnce sync.Once
    33  	signalNameMap     map[string]syscall.Signal
    34  )
    35  
    36  // errnoErr returns common boxed Errno values, to prevent
    37  // allocations at runtime.
    38  func errnoErr(e syscall.Errno) error {
    39  	switch e {
    40  	case 0:
    41  		return nil
    42  	case EAGAIN:
    43  		return errEAGAIN
    44  	case EINVAL:
    45  		return errEINVAL
    46  	case ENOENT:
    47  		return errENOENT
    48  	}
    49  	return e
    50  }
    51  
    52  // ErrnoName returns the error name for error number e.
    53  func ErrnoName(e syscall.Errno) string {
    54  	i := sort.Search(len(errorList), func(i int) bool {
    55  		return errorList[i].num >= e
    56  	})
    57  	if i < len(errorList) && errorList[i].num == e {
    58  		return errorList[i].name
    59  	}
    60  	return ""
    61  }
    62  
    63  // SignalName returns the signal name for signal number s.
    64  func SignalName(s syscall.Signal) string {
    65  	i := sort.Search(len(signalList), func(i int) bool {
    66  		return signalList[i].num >= s
    67  	})
    68  	if i < len(signalList) && signalList[i].num == s {
    69  		return signalList[i].name
    70  	}
    71  	return ""
    72  }
    73  
    74  // SignalNum returns the syscall.Signal for signal named s,
    75  // or 0 if a signal with such name is not found.
    76  // The signal name should start with "SIG".
    77  func SignalNum(s string) syscall.Signal {
    78  	signalNameMapOnce.Do(func() {
    79  		signalNameMap = make(map[string]syscall.Signal, len(signalList))
    80  		for _, signal := range signalList {
    81  			signalNameMap[signal.name] = signal.num
    82  		}
    83  	})
    84  	return signalNameMap[s]
    85  }
    86  
    87  // clen returns the index of the first NULL byte in n or len(n) if n contains no NULL byte.
    88  func clen(n []byte) int {
    89  	i := bytes.IndexByte(n, 0)
    90  	if i == -1 {
    91  		i = len(n)
    92  	}
    93  	return i
    94  }
    95  
    96  // Mmap manager, for use by operating system-specific implementations.
    97  
    98  type mmapper struct {
    99  	sync.Mutex
   100  	active map[*byte][]byte // active mappings; key is last byte in mapping
   101  	mmap   func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
   102  	munmap func(addr uintptr, length uintptr) error
   103  }
   104  
   105  func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
   106  	if length <= 0 {
   107  		return nil, EINVAL
   108  	}
   109  
   110  	// Map the requested memory.
   111  	addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset)
   112  	if errno != nil {
   113  		return nil, errno
   114  	}
   115  
   116  	// Use unsafe to convert addr into a []byte.
   117  	b := unsafe.Slice((*byte)(unsafe.Pointer(addr)), length)
   118  
   119  	// Register mapping in m and return it.
   120  	p := &b[cap(b)-1]
   121  	m.Lock()
   122  	defer m.Unlock()
   123  	m.active[p] = b
   124  	return b, nil
   125  }
   126  
   127  func (m *mmapper) Munmap(data []byte) (err error) {
   128  	if len(data) == 0 || len(data) != cap(data) {
   129  		return EINVAL
   130  	}
   131  
   132  	// Find the base of the mapping.
   133  	p := &data[cap(data)-1]
   134  	m.Lock()
   135  	defer m.Unlock()
   136  	b := m.active[p]
   137  	if b == nil || &b[0] != &data[0] {
   138  		return EINVAL
   139  	}
   140  
   141  	// Unmap the memory and update m.
   142  	if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil {
   143  		return errno
   144  	}
   145  	delete(m.active, p)
   146  	return nil
   147  }
   148  
   149  func Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
   150  	return mapper.Mmap(fd, offset, length, prot, flags)
   151  }
   152  
   153  func Munmap(b []byte) (err error) {
   154  	return mapper.Munmap(b)
   155  }
   156  
   157  func MmapPtr(fd int, offset int64, addr unsafe.Pointer, length uintptr, prot int, flags int) (ret unsafe.Pointer, err error) {
   158  	xaddr, err := mapper.mmap(uintptr(addr), length, prot, flags, fd, offset)
   159  	return unsafe.Pointer(xaddr), err
   160  }
   161  
   162  func MunmapPtr(addr unsafe.Pointer, length uintptr) (err error) {
   163  	return mapper.munmap(uintptr(addr), length)
   164  }
   165  
   166  func Read(fd int, p []byte) (n int, err error) {
   167  	n, err = read(fd, p)
   168  	if raceenabled {
   169  		if n > 0 {
   170  			raceWriteRange(unsafe.Pointer(&p[0]), n)
   171  		}
   172  		if err == nil {
   173  			raceAcquire(unsafe.Pointer(&ioSync))
   174  		}
   175  	}
   176  	return
   177  }
   178  
   179  func Write(fd int, p []byte) (n int, err error) {
   180  	if raceenabled {
   181  		raceReleaseMerge(unsafe.Pointer(&ioSync))
   182  	}
   183  	n, err = write(fd, p)
   184  	if raceenabled && n > 0 {
   185  		raceReadRange(unsafe.Pointer(&p[0]), n)
   186  	}
   187  	return
   188  }
   189  
   190  func Pread(fd int, p []byte, offset int64) (n int, err error) {
   191  	n, err = pread(fd, p, offset)
   192  	if raceenabled {
   193  		if n > 0 {
   194  			raceWriteRange(unsafe.Pointer(&p[0]), n)
   195  		}
   196  		if err == nil {
   197  			raceAcquire(unsafe.Pointer(&ioSync))
   198  		}
   199  	}
   200  	return
   201  }
   202  
   203  func Pwrite(fd int, p []byte, offset int64) (n int, err error) {
   204  	if raceenabled {
   205  		raceReleaseMerge(unsafe.Pointer(&ioSync))
   206  	}
   207  	n, err = pwrite(fd, p, offset)
   208  	if raceenabled && n > 0 {
   209  		raceReadRange(unsafe.Pointer(&p[0]), n)
   210  	}
   211  	return
   212  }
   213  
   214  // For testing: clients can set this flag to force
   215  // creation of IPv6 sockets to return EAFNOSUPPORT.
   216  var SocketDisableIPv6 bool
   217  
   218  // Sockaddr represents a socket address.
   219  type Sockaddr interface {
   220  	sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs
   221  }
   222  
   223  // SockaddrInet4 implements the Sockaddr interface for AF_INET type sockets.
   224  type SockaddrInet4 struct {
   225  	Port int
   226  	Addr [4]byte
   227  	raw  RawSockaddrInet4
   228  }
   229  
   230  // SockaddrInet6 implements the Sockaddr interface for AF_INET6 type sockets.
   231  type SockaddrInet6 struct {
   232  	Port   int
   233  	ZoneId uint32
   234  	Addr   [16]byte
   235  	raw    RawSockaddrInet6
   236  }
   237  
   238  // SockaddrUnix implements the Sockaddr interface for AF_UNIX type sockets.
   239  type SockaddrUnix struct {
   240  	Name string
   241  	raw  RawSockaddrUnix
   242  }
   243  
   244  func Bind(fd int, sa Sockaddr) (err error) {
   245  	ptr, n, err := sa.sockaddr()
   246  	if err != nil {
   247  		return err
   248  	}
   249  	return bind(fd, ptr, n)
   250  }
   251  
   252  func Connect(fd int, sa Sockaddr) (err error) {
   253  	ptr, n, err := sa.sockaddr()
   254  	if err != nil {
   255  		return err
   256  	}
   257  	return connect(fd, ptr, n)
   258  }
   259  
   260  func Getpeername(fd int) (sa Sockaddr, err error) {
   261  	var rsa RawSockaddrAny
   262  	var len _Socklen = SizeofSockaddrAny
   263  	if err = getpeername(fd, &rsa, &len); err != nil {
   264  		return
   265  	}
   266  	return anyToSockaddr(fd, &rsa)
   267  }
   268  
   269  func GetsockoptByte(fd, level, opt int) (value byte, err error) {
   270  	var n byte
   271  	vallen := _Socklen(1)
   272  	err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
   273  	return n, err
   274  }
   275  
   276  func GetsockoptInt(fd, level, opt int) (value int, err error) {
   277  	var n int32
   278  	vallen := _Socklen(4)
   279  	err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
   280  	return int(n), err
   281  }
   282  
   283  func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) {
   284  	vallen := _Socklen(4)
   285  	err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen)
   286  	return value, err
   287  }
   288  
   289  func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) {
   290  	var value IPMreq
   291  	vallen := _Socklen(SizeofIPMreq)
   292  	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
   293  	return &value, err
   294  }
   295  
   296  func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) {
   297  	var value IPv6Mreq
   298  	vallen := _Socklen(SizeofIPv6Mreq)
   299  	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
   300  	return &value, err
   301  }
   302  
   303  func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) {
   304  	var value IPv6MTUInfo
   305  	vallen := _Socklen(SizeofIPv6MTUInfo)
   306  	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
   307  	return &value, err
   308  }
   309  
   310  func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) {
   311  	var value ICMPv6Filter
   312  	vallen := _Socklen(SizeofICMPv6Filter)
   313  	err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
   314  	return &value, err
   315  }
   316  
   317  func GetsockoptLinger(fd, level, opt int) (*Linger, error) {
   318  	var linger Linger
   319  	vallen := _Socklen(SizeofLinger)
   320  	err := getsockopt(fd, level, opt, unsafe.Pointer(&linger), &vallen)
   321  	return &linger, err
   322  }
   323  
   324  func GetsockoptTimeval(fd, level, opt int) (*Timeval, error) {
   325  	var tv Timeval
   326  	vallen := _Socklen(unsafe.Sizeof(tv))
   327  	err := getsockopt(fd, level, opt, unsafe.Pointer(&tv), &vallen)
   328  	return &tv, err
   329  }
   330  
   331  func GetsockoptUint64(fd, level, opt int) (value uint64, err error) {
   332  	var n uint64
   333  	vallen := _Socklen(8)
   334  	err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
   335  	return n, err
   336  }
   337  
   338  func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
   339  	var rsa RawSockaddrAny
   340  	var len _Socklen = SizeofSockaddrAny
   341  	if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
   342  		return
   343  	}
   344  	if rsa.Addr.Family != AF_UNSPEC {
   345  		from, err = anyToSockaddr(fd, &rsa)
   346  	}
   347  	return
   348  }
   349  
   350  // Recvmsg receives a message from a socket using the recvmsg system call. The
   351  // received non-control data will be written to p, and any "out of band"
   352  // control data will be written to oob. The flags are passed to recvmsg.
   353  //
   354  // The results are:
   355  //   - n is the number of non-control data bytes read into p
   356  //   - oobn is the number of control data bytes read into oob; this may be interpreted using [ParseSocketControlMessage]
   357  //   - recvflags is flags returned by recvmsg
   358  //   - from is the address of the sender
   359  //
   360  // If the underlying socket type is not SOCK_DGRAM, a received message
   361  // containing oob data and a single '\0' of non-control data is treated as if
   362  // the message contained only control data, i.e. n will be zero on return.
   363  func Recvmsg(fd int, p, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
   364  	var iov [1]Iovec
   365  	if len(p) > 0 {
   366  		iov[0].Base = &p[0]
   367  		iov[0].SetLen(len(p))
   368  	}
   369  	var rsa RawSockaddrAny
   370  	n, oobn, recvflags, err = recvmsgRaw(fd, iov[:], oob, flags, &rsa)
   371  	// source address is only specified if the socket is unconnected
   372  	if rsa.Addr.Family != AF_UNSPEC {
   373  		from, err = anyToSockaddr(fd, &rsa)
   374  	}
   375  	return
   376  }
   377  
   378  // RecvmsgBuffers receives a message from a socket using the recvmsg system
   379  // call. This function is equivalent to Recvmsg, but non-control data read is
   380  // scattered into the buffers slices.
   381  func RecvmsgBuffers(fd int, buffers [][]byte, oob []byte, flags int) (n, oobn int, recvflags int, from Sockaddr, err error) {
   382  	iov := make([]Iovec, len(buffers))
   383  	for i := range buffers {
   384  		if len(buffers[i]) > 0 {
   385  			iov[i].Base = &buffers[i][0]
   386  			iov[i].SetLen(len(buffers[i]))
   387  		} else {
   388  			iov[i].Base = (*byte)(unsafe.Pointer(&_zero))
   389  		}
   390  	}
   391  	var rsa RawSockaddrAny
   392  	n, oobn, recvflags, err = recvmsgRaw(fd, iov, oob, flags, &rsa)
   393  	if err == nil && rsa.Addr.Family != AF_UNSPEC {
   394  		from, err = anyToSockaddr(fd, &rsa)
   395  	}
   396  	return
   397  }
   398  
   399  // Sendmsg sends a message on a socket to an address using the sendmsg system
   400  // call. This function is equivalent to SendmsgN, but does not return the
   401  // number of bytes actually sent.
   402  func Sendmsg(fd int, p, oob []byte, to Sockaddr, flags int) (err error) {
   403  	_, err = SendmsgN(fd, p, oob, to, flags)
   404  	return
   405  }
   406  
   407  // SendmsgN sends a message on a socket to an address using the sendmsg system
   408  // call. p contains the non-control data to send, and oob contains the "out of
   409  // band" control data. The flags are passed to sendmsg. The number of
   410  // non-control bytes actually written to the socket is returned.
   411  //
   412  // Some socket types do not support sending control data without accompanying
   413  // non-control data. If p is empty, and oob contains control data, and the
   414  // underlying socket type is not SOCK_DGRAM, p will be treated as containing a
   415  // single '\0' and the return value will indicate zero bytes sent.
   416  //
   417  // The Go function Recvmsg, if called with an empty p and a non-empty oob,
   418  // will read and ignore this additional '\0'.  If the message is received by
   419  // code that does not use Recvmsg, or that does not use Go at all, that code
   420  // will need to be written to expect and ignore the additional '\0'.
   421  //
   422  // If you need to send non-empty oob with p actually empty, and if the
   423  // underlying socket type supports it, you can do so via a raw system call as
   424  // follows:
   425  //
   426  //	msg := &unix.Msghdr{
   427  //	    Control: &oob[0],
   428  //	}
   429  //	msg.SetControllen(len(oob))
   430  //	n, _, errno := unix.Syscall(unix.SYS_SENDMSG, uintptr(fd), uintptr(unsafe.Pointer(msg)), flags)
   431  func SendmsgN(fd int, p, oob []byte, to Sockaddr, flags int) (n int, err error) {
   432  	var iov [1]Iovec
   433  	if len(p) > 0 {
   434  		iov[0].Base = &p[0]
   435  		iov[0].SetLen(len(p))
   436  	}
   437  	var ptr unsafe.Pointer
   438  	var salen _Socklen
   439  	if to != nil {
   440  		ptr, salen, err = to.sockaddr()
   441  		if err != nil {
   442  			return 0, err
   443  		}
   444  	}
   445  	return sendmsgN(fd, iov[:], oob, ptr, salen, flags)
   446  }
   447  
   448  // SendmsgBuffers sends a message on a socket to an address using the sendmsg
   449  // system call. This function is equivalent to SendmsgN, but the non-control
   450  // data is gathered from buffers.
   451  func SendmsgBuffers(fd int, buffers [][]byte, oob []byte, to Sockaddr, flags int) (n int, err error) {
   452  	iov := make([]Iovec, len(buffers))
   453  	for i := range buffers {
   454  		if len(buffers[i]) > 0 {
   455  			iov[i].Base = &buffers[i][0]
   456  			iov[i].SetLen(len(buffers[i]))
   457  		} else {
   458  			iov[i].Base = (*byte)(unsafe.Pointer(&_zero))
   459  		}
   460  	}
   461  	var ptr unsafe.Pointer
   462  	var salen _Socklen
   463  	if to != nil {
   464  		ptr, salen, err = to.sockaddr()
   465  		if err != nil {
   466  			return 0, err
   467  		}
   468  	}
   469  	return sendmsgN(fd, iov, oob, ptr, salen, flags)
   470  }
   471  
   472  func Send(s int, buf []byte, flags int) (err error) {
   473  	return sendto(s, buf, flags, nil, 0)
   474  }
   475  
   476  func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
   477  	var ptr unsafe.Pointer
   478  	var salen _Socklen
   479  	if to != nil {
   480  		ptr, salen, err = to.sockaddr()
   481  		if err != nil {
   482  			return err
   483  		}
   484  	}
   485  	return sendto(fd, p, flags, ptr, salen)
   486  }
   487  
   488  func SetsockoptByte(fd, level, opt int, value byte) (err error) {
   489  	return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
   490  }
   491  
   492  func SetsockoptInt(fd, level, opt int, value int) (err error) {
   493  	var n = int32(value)
   494  	return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
   495  }
   496  
   497  func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
   498  	return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4)
   499  }
   500  
   501  func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
   502  	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq)
   503  }
   504  
   505  func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
   506  	return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq)
   507  }
   508  
   509  func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error {
   510  	return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter)
   511  }
   512  
   513  func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
   514  	return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger)
   515  }
   516  
   517  func SetsockoptString(fd, level, opt int, s string) (err error) {
   518  	var p unsafe.Pointer
   519  	if len(s) > 0 {
   520  		p = unsafe.Pointer(&[]byte(s)[0])
   521  	}
   522  	return setsockopt(fd, level, opt, p, uintptr(len(s)))
   523  }
   524  
   525  func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
   526  	return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv))
   527  }
   528  
   529  func SetsockoptUint64(fd, level, opt int, value uint64) (err error) {
   530  	return setsockopt(fd, level, opt, unsafe.Pointer(&value), 8)
   531  }
   532  
   533  func Socket(domain, typ, proto int) (fd int, err error) {
   534  	if domain == AF_INET6 && SocketDisableIPv6 {
   535  		return -1, EAFNOSUPPORT
   536  	}
   537  	fd, err = socket(domain, typ, proto)
   538  	return
   539  }
   540  
   541  func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
   542  	var fdx [2]int32
   543  	err = socketpair(domain, typ, proto, &fdx)
   544  	if err == nil {
   545  		fd[0] = int(fdx[0])
   546  		fd[1] = int(fdx[1])
   547  	}
   548  	return
   549  }
   550  
   551  var ioSync int64
   552  
   553  func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }
   554  
   555  func SetNonblock(fd int, nonblocking bool) (err error) {
   556  	flag, err := fcntl(fd, F_GETFL, 0)
   557  	if err != nil {
   558  		return err
   559  	}
   560  	if (flag&O_NONBLOCK != 0) == nonblocking {
   561  		return nil
   562  	}
   563  	if nonblocking {
   564  		flag |= O_NONBLOCK
   565  	} else {
   566  		flag &= ^O_NONBLOCK
   567  	}
   568  	_, err = fcntl(fd, F_SETFL, flag)
   569  	return err
   570  }
   571  
   572  // Exec calls execve(2), which replaces the calling executable in the process
   573  // tree. argv0 should be the full path to an executable ("/bin/ls") and the
   574  // executable name should also be the first argument in argv (["ls", "-l"]).
   575  // envv are the environment variables that should be passed to the new
   576  // process (["USER=go", "PWD=/tmp"]).
   577  func Exec(argv0 string, argv []string, envv []string) error {
   578  	return syscall.Exec(argv0, argv, envv)
   579  }
   580  
   581  // Lutimes sets the access and modification times tv on path. If path refers to
   582  // a symlink, it is not dereferenced and the timestamps are set on the symlink.
   583  // If tv is nil, the access and modification times are set to the current time.
   584  // Otherwise tv must contain exactly 2 elements, with access time as the first
   585  // element and modification time as the second element.
   586  func Lutimes(path string, tv []Timeval) error {
   587  	if tv == nil {
   588  		return UtimesNanoAt(AT_FDCWD, path, nil, AT_SYMLINK_NOFOLLOW)
   589  	}
   590  	if len(tv) != 2 {
   591  		return EINVAL
   592  	}
   593  	ts := []Timespec{
   594  		NsecToTimespec(TimevalToNsec(tv[0])),
   595  		NsecToTimespec(TimevalToNsec(tv[1])),
   596  	}
   597  	return UtimesNanoAt(AT_FDCWD, path, ts, AT_SYMLINK_NOFOLLOW)
   598  }
   599  
   600  // emptyIovecs reports whether there are no bytes in the slice of Iovec.
   601  func emptyIovecs(iov []Iovec) bool {
   602  	for i := range iov {
   603  		if iov[i].Len > 0 {
   604  			return false
   605  		}
   606  	}
   607  	return true
   608  }
   609  
   610  // Setrlimit sets a resource limit.
   611  func Setrlimit(resource int, rlim *Rlimit) error {
   612  	// Just call the syscall version, because as of Go 1.21
   613  	// it will affect starting a new process.
   614  	return syscall.Setrlimit(resource, (*syscall.Rlimit)(rlim))
   615  }
   616
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