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
26 solaris64Bit = runtime.GOOS == "solaris" && sizeofPtr == 8
29 // Do the interface allocations only once for common
32 errEAGAIN error = syscall.EAGAIN
33 errEINVAL error = syscall.EINVAL
34 errENOENT error = syscall.ENOENT
37 // errnoErr returns common boxed Errno values, to prevent
38 // allocations at runtime.
39 func errnoErr(e syscall.Errno) error {
53 // Mmap manager, for use by operating system-specific implementations.
57 active map[*byte][]byte // active mappings; key is last byte in mapping
58 mmap func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
59 munmap func(addr uintptr, length uintptr) error
62 func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {
67 // Map the requested memory.
68 addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset)
73 // Slice memory layout
78 }{addr, length, length}
80 // Use unsafe to turn sl into a []byte.
81 b := *(*[]byte)(unsafe.Pointer(&sl))
83 // Register mapping in m and return it.
91 func (m *mmapper) Munmap(data []byte) (err error) {
92 if len(data) == 0 || len(data) != cap(data) {
96 // Find the base of the mapping.
97 p := &data[cap(data)-1]
101 if b == nil || &b[0] != &data[0] {
105 // Unmap the memory and update m.
106 if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil {
113 func Read(fd int, p []byte) (n int, err error) {
117 raceWriteRange(unsafe.Pointer(&p[0]), n)
120 raceAcquire(unsafe.Pointer(&ioSync))
126 func Write(fd int, p []byte) (n int, err error) {
128 raceReleaseMerge(unsafe.Pointer(&ioSync))
130 n, err = write(fd, p)
131 if raceenabled && n > 0 {
132 raceReadRange(unsafe.Pointer(&p[0]), n)
137 // For testing: clients can set this flag to force
138 // creation of IPv6 sockets to return EAFNOSUPPORT.
139 var SocketDisableIPv6 bool
141 type Sockaddr interface {
142 sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs
145 type SockaddrInet4 struct {
151 type SockaddrInet6 struct {
158 type SockaddrUnix struct {
163 func Bind(fd int, sa Sockaddr) (err error) {
164 ptr, n, err := sa.sockaddr()
168 return bind(fd, ptr, n)
171 func Connect(fd int, sa Sockaddr) (err error) {
172 ptr, n, err := sa.sockaddr()
176 return connect(fd, ptr, n)
179 func Getpeername(fd int) (sa Sockaddr, err error) {
180 var rsa RawSockaddrAny
181 var len _Socklen = SizeofSockaddrAny
182 if err = getpeername(fd, &rsa, &len); err != nil {
185 return anyToSockaddr(&rsa)
188 func GetsockoptInt(fd, level, opt int) (value int, err error) {
190 vallen := _Socklen(4)
191 err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
195 func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) {
196 var rsa RawSockaddrAny
197 var len _Socklen = SizeofSockaddrAny
198 if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil {
201 if rsa.Addr.Family != AF_UNSPEC {
202 from, err = anyToSockaddr(&rsa)
207 func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) {
208 ptr, n, err := to.sockaddr()
212 return sendto(fd, p, flags, ptr, n)
215 func SetsockoptByte(fd, level, opt int, value byte) (err error) {
216 return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1)
219 func SetsockoptInt(fd, level, opt int, value int) (err error) {
221 return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4)
224 func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) {
225 return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4)
228 func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) {
229 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq)
232 func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) {
233 return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq)
236 func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error {
237 return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter)
240 func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) {
241 return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger)
244 func SetsockoptString(fd, level, opt int, s string) (err error) {
245 return setsockopt(fd, level, opt, unsafe.Pointer(&[]byte(s)[0]), uintptr(len(s)))
248 func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) {
249 return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv))
252 func Socket(domain, typ, proto int) (fd int, err error) {
253 if domain == AF_INET6 && SocketDisableIPv6 {
254 return -1, EAFNOSUPPORT
256 fd, err = socket(domain, typ, proto)
260 func Socketpair(domain, typ, proto int) (fd [2]int, err error) {
262 err = socketpair(domain, typ, proto, &fdx)
270 func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) {
272 raceReleaseMerge(unsafe.Pointer(&ioSync))
274 return sendfile(outfd, infd, offset, count)
279 func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) }
281 func SetNonblock(fd int, nonblocking bool) (err error) {
282 flag, err := fcntl(fd, F_GETFL, 0)
291 _, err = fcntl(fd, F_SETFL, flag)