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 darwin dragonfly freebsd linux netbsd openbsd solaris
23 darwin64Bit = runtime.GOOS == "darwin" && sizeofPtr == 8
24 dragonfly64Bit = runtime.GOOS == "dragonfly" && sizeofPtr == 8
25 netbsd32Bit = runtime.GOOS == "netbsd" && sizeofPtr == 4
28 // Do the interface allocations only once for common
31 errEAGAIN error = syscall.EAGAIN
32 errEINVAL error = syscall.EINVAL
33 errENOENT error = syscall.ENOENT
36 // errnoErr returns common boxed Errno values, to prevent
37 // allocations at runtime.
38 func errnoErr(e syscall.Errno) error {
52 // Mmap manager, for use by operating system-specific implementations.
56 active map[*byte][]byte // active mappings; key is last byte in mapping
57 mmap func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
58 munmap func(addr uintptr, length uintptr) error
61 func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
66 // Map the requested memory.
67 addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset)
72 // Slice memory layout
77 }{addr, length, length}
79 // Use unsafe to turn sl into a []byte.
80 b := *(*[]byte)(unsafe.Pointer(&sl))
82 // Register mapping in m and return it.
90 func (m *mmapper) Munmap(data []byte) (err error) {
91 if len(data) == 0 || len(data) != cap(data) {
95 // Find the base of the mapping.
96 p := &data[cap(data)-1]
100 if b == nil || &b[0] != &data[0] {
104 // Unmap the memory and update m.
105 if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil {
112 func Read(fd int, p []byte) (n int, err error) {
116 raceWriteRange(unsafe.Pointer(&p[0]), n)
119 raceAcquire(unsafe.Pointer(&ioSync))
125 func Write(fd int, p []byte) (n int, err error) {
127 raceReleaseMerge(unsafe.Pointer(&ioSync))
129 n, err = write(fd, p)
130 if raceenabled && n > 0 {
131 raceReadRange(unsafe.Pointer(&p[0]), n)
136 // For testing: clients can set this flag to force
137 // creation of IPv6 sockets to return EAFNOSUPPORT.
138 var SocketDisableIPv6 bool
140 type Sockaddr interface {
141 sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs
144 type SockaddrInet4 struct {
150 type SockaddrInet6 struct {
157 type SockaddrUnix struct {
162 func Bind(fd int, sa Sockaddr) (err error) {
163 ptr, n, err := sa.sockaddr()
167 return bind(fd, ptr, n)
170 func Connect(fd int, sa Sockaddr) (err error) {
171 ptr, n, err := sa.sockaddr()
175 return connect(fd, ptr, n)
178 func Getpeername(fd int) (sa Sockaddr, err error) {
179 var rsa RawSockaddrAny
180 var len _Socklen = SizeofSockaddrAny
181 if err = getpeername(fd, &rsa, &len); err != nil {
184 return anyToSockaddr(&rsa)
187 func GetsockoptInt(fd, level, opt int) (value int, err error) {
189 vallen := _Socklen(4)
190 err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
194 func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
195 var rsa RawSockaddrAny
196 var len _Socklen = SizeofSockaddrAny
197 if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
200 if rsa.Addr.Family != AF_UNSPEC {
201 from, err = anyToSockaddr(&rsa)
206 func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
207 ptr, n, err := to.sockaddr()
211 return sendto(fd, p, flags, ptr, n)
214 func SetsockoptByte(fd, level, opt int, value byte) (err error) {
215 return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
218 func SetsockoptInt(fd, level, opt int, value int) (err error) {
220 return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
223 func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
224 return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4)
227 func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
228 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq)
231 func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
232 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq)
235 func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error {
236 return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter)
239 func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
240 return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger)
243 func SetsockoptString(fd, level, opt int, s string) (err error) {
244 return setsockopt(fd, level, opt, unsafe.Pointer(&[]byte(s)[0]), uintptr(len(s)))
247 func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
248 return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv))
251 func Socket(domain, typ, proto int) (fd int, err error) {
252 if domain == AF_INET6 && SocketDisableIPv6 {
253 return -1, EAFNOSUPPORT
255 fd, err = socket(domain, typ, proto)
259 func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
261 err = socketpair(domain, typ, proto, &fdx)
269 func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
271 raceReleaseMerge(unsafe.Pointer(&ioSync))
273 return sendfile(outfd, infd, offset, count)
278 func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }
280 func SetNonblock(fd int, nonblocking bool) (err error) {
281 flag, err := fcntl(fd, F_GETFL, 0)
290 _, err = fcntl(fd, F_SETFL, flag)