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.
5 // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
16 "golang.org/x/sys/internal/unsafeheader"
25 // Do the interface allocations only once for common
28 errEAGAIN error = syscall.EAGAIN
29 errEINVAL error = syscall.EINVAL
30 errENOENT error = syscall.ENOENT
34 signalNameMapOnce sync.Once
35 signalNameMap map[string]syscall.Signal
38 // errnoErr returns common boxed Errno values, to prevent
39 // allocations at runtime.
40 func errnoErr(e syscall.Errno) error {
54 // ErrnoName returns the error name for error number e.
55 func ErrnoName(e syscall.Errno) string {
56 i := sort.Search(len(errorList), func(i int) bool {
57 return errorList[i].num >= e
59 if i < len(errorList) && errorList[i].num == e {
60 return errorList[i].name
65 // SignalName returns the signal name for signal number s.
66 func SignalName(s syscall.Signal) string {
67 i := sort.Search(len(signalList), func(i int) bool {
68 return signalList[i].num >= s
70 if i < len(signalList) && signalList[i].num == s {
71 return signalList[i].name
76 // SignalNum returns the syscall.Signal for signal named s,
77 // or 0 if a signal with such name is not found.
78 // The signal name should start with "SIG".
79 func SignalNum(s string) syscall.Signal {
80 signalNameMapOnce.Do(func() {
81 signalNameMap = make(map[string]syscall.Signal, len(signalList))
82 for _, signal := range signalList {
83 signalNameMap[signal.name] = signal.num
86 return signalNameMap[s]
89 // clen returns the index of the first NULL byte in n or len(n) if n contains no NULL byte.
90 func clen(n []byte) int {
91 i := bytes.IndexByte(n, 0)
98 // Mmap manager, for use by operating system-specific implementations.
100 type mmapper struct {
102 active map[*byte][]byte // active mappings; key is last byte in mapping
103 mmap func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
104 munmap func(addr uintptr, length uintptr) error
107 func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
112 // Map the requested memory.
113 addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset)
118 // Use unsafe to convert addr into a []byte.
120 hdr := (*unsafeheader.Slice)(unsafe.Pointer(&b))
121 hdr.Data = unsafe.Pointer(addr)
125 // Register mapping in m and return it.
133 func (m *mmapper) Munmap(data []byte) (err error) {
134 if len(data) == 0 || len(data) != cap(data) {
138 // Find the base of the mapping.
139 p := &data[cap(data)-1]
143 if b == nil || &b[0] != &data[0] {
147 // Unmap the memory and update m.
148 if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil {
155 func Read(fd int, p []byte) (n int, err error) {
159 raceWriteRange(unsafe.Pointer(&p[0]), n)
162 raceAcquire(unsafe.Pointer(&ioSync))
168 func Write(fd int, p []byte) (n int, err error) {
170 raceReleaseMerge(unsafe.Pointer(&ioSync))
172 n, err = write(fd, p)
173 if raceenabled && n > 0 {
174 raceReadRange(unsafe.Pointer(&p[0]), n)
179 // For testing: clients can set this flag to force
180 // creation of IPv6 sockets to return EAFNOSUPPORT.
181 var SocketDisableIPv6 bool
183 // Sockaddr represents a socket address.
184 type Sockaddr interface {
185 sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs
188 // SockaddrInet4 implements the Sockaddr interface for AF_INET type sockets.
189 type SockaddrInet4 struct {
195 // SockaddrInet6 implements the Sockaddr interface for AF_INET6 type sockets.
196 type SockaddrInet6 struct {
203 // SockaddrUnix implements the Sockaddr interface for AF_UNIX type sockets.
204 type SockaddrUnix struct {
209 func Bind(fd int, sa Sockaddr) (err error) {
210 ptr, n, err := sa.sockaddr()
214 return bind(fd, ptr, n)
217 func Connect(fd int, sa Sockaddr) (err error) {
218 ptr, n, err := sa.sockaddr()
222 return connect(fd, ptr, n)
225 func Getpeername(fd int) (sa Sockaddr, err error) {
226 var rsa RawSockaddrAny
227 var len _Socklen = SizeofSockaddrAny
228 if err = getpeername(fd, &rsa, &len); err != nil {
231 return anyToSockaddr(fd, &rsa)
234 func GetsockoptByte(fd, level, opt int) (value byte, err error) {
236 vallen := _Socklen(1)
237 err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
241 func GetsockoptInt(fd, level, opt int) (value int, err error) {
243 vallen := _Socklen(4)
244 err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
248 func GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) {
249 vallen := _Socklen(4)
250 err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen)
254 func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) {
256 vallen := _Socklen(SizeofIPMreq)
257 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
261 func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) {
263 vallen := _Socklen(SizeofIPv6Mreq)
264 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
268 func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) {
269 var value IPv6MTUInfo
270 vallen := _Socklen(SizeofIPv6MTUInfo)
271 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
275 func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) {
276 var value ICMPv6Filter
277 vallen := _Socklen(SizeofICMPv6Filter)
278 err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
282 func GetsockoptLinger(fd, level, opt int) (*Linger, error) {
284 vallen := _Socklen(SizeofLinger)
285 err := getsockopt(fd, level, opt, unsafe.Pointer(&linger), &vallen)
289 func GetsockoptTimeval(fd, level, opt int) (*Timeval, error) {
291 vallen := _Socklen(unsafe.Sizeof(tv))
292 err := getsockopt(fd, level, opt, unsafe.Pointer(&tv), &vallen)
296 func GetsockoptUint64(fd, level, opt int) (value uint64, err error) {
298 vallen := _Socklen(8)
299 err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
303 func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
304 var rsa RawSockaddrAny
305 var len _Socklen = SizeofSockaddrAny
306 if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
309 if rsa.Addr.Family != AF_UNSPEC {
310 from, err = anyToSockaddr(fd, &rsa)
315 func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
316 ptr, n, err := to.sockaddr()
320 return sendto(fd, p, flags, ptr, n)
323 func SetsockoptByte(fd, level, opt int, value byte) (err error) {
324 return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
327 func SetsockoptInt(fd, level, opt int, value int) (err error) {
329 return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
332 func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
333 return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4)
336 func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
337 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq)
340 func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
341 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq)
344 func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error {
345 return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter)
348 func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
349 return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger)
352 func SetsockoptString(fd, level, opt int, s string) (err error) {
355 p = unsafe.Pointer(&[]byte(s)[0])
357 return setsockopt(fd, level, opt, p, uintptr(len(s)))
360 func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
361 return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv))
364 func SetsockoptUint64(fd, level, opt int, value uint64) (err error) {
365 return setsockopt(fd, level, opt, unsafe.Pointer(&value), 8)
368 func Socket(domain, typ, proto int) (fd int, err error) {
369 if domain == AF_INET6 && SocketDisableIPv6 {
370 return -1, EAFNOSUPPORT
372 fd, err = socket(domain, typ, proto)
376 func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
378 err = socketpair(domain, typ, proto, &fdx)
388 func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }
390 func SetNonblock(fd int, nonblocking bool) (err error) {
391 flag, err := fcntl(fd, F_GETFL, 0)
400 _, err = fcntl(fd, F_SETFL, flag)
404 // Exec calls execve(2), which replaces the calling executable in the process
405 // tree. argv0 should be the full path to an executable ("/bin/ls") and the
406 // executable name should also be the first argument in argv (["ls", "-l"]).
407 // envv are the environment variables that should be passed to the new
408 // process (["USER=go", "PWD=/tmp"]).
409 func Exec(argv0 string, argv []string, envv []string) error {
410 return syscall.Exec(argv0, argv, envv)
413 // Lutimes sets the access and modification times tv on path. If path refers to
414 // a symlink, it is not dereferenced and the timestamps are set on the symlink.
415 // If tv is nil, the access and modification times are set to the current time.
416 // Otherwise tv must contain exactly 2 elements, with access time as the first
417 // element and modification time as the second element.
418 func Lutimes(path string, tv []Timeval) error {
420 return UtimesNanoAt(AT_FDCWD, path, nil, AT_SYMLINK_NOFOLLOW)
426 NsecToTimespec(TimevalToNsec(tv[0])),
427 NsecToTimespec(TimevalToNsec(tv[1])),
429 return UtimesNanoAt(AT_FDCWD, path, ts, AT_SYMLINK_NOFOLLOW)