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297 lines
6.8 KiB
297 lines
6.8 KiB
// Copyright 2009 The Go Authors. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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// +build darwin dragonfly freebsd linux netbsd openbsd solaris |
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package unix |
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import ( |
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"runtime" |
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"sync" |
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"syscall" |
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"unsafe" |
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) |
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var ( |
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Stdin = 0 |
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Stdout = 1 |
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Stderr = 2 |
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) |
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const ( |
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darwin64Bit = runtime.GOOS == "darwin" && sizeofPtr == 8 |
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dragonfly64Bit = runtime.GOOS == "dragonfly" && sizeofPtr == 8 |
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netbsd32Bit = runtime.GOOS == "netbsd" && sizeofPtr == 4 |
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) |
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// Do the interface allocations only once for common |
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// Errno values. |
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var ( |
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errEAGAIN error = syscall.EAGAIN |
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errEINVAL error = syscall.EINVAL |
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errENOENT error = syscall.ENOENT |
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) |
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// errnoErr returns common boxed Errno values, to prevent |
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// allocations at runtime. |
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func errnoErr(e syscall.Errno) error { |
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switch e { |
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case 0: |
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return nil |
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case EAGAIN: |
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return errEAGAIN |
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case EINVAL: |
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return errEINVAL |
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case ENOENT: |
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return errENOENT |
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} |
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return e |
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} |
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func Syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno) |
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func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno) |
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func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno) |
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func RawSyscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno) |
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// Mmap manager, for use by operating system-specific implementations. |
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type mmapper struct { |
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sync.Mutex |
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active map[*byte][]byte // active mappings; key is last byte in mapping |
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mmap func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error) |
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munmap func(addr uintptr, length uintptr) error |
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} |
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func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) { |
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if length <= 0 { |
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return nil, EINVAL |
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} |
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// Map the requested memory. |
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addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset) |
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if errno != nil { |
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return nil, errno |
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} |
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// Slice memory layout |
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var sl = struct { |
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addr uintptr |
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len int |
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cap int |
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}{addr, length, length} |
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// Use unsafe to turn sl into a []byte. |
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b := *(*[]byte)(unsafe.Pointer(&sl)) |
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// Register mapping in m and return it. |
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p := &b[cap(b)-1] |
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m.Lock() |
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defer m.Unlock() |
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m.active[p] = b |
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return b, nil |
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} |
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func (m *mmapper) Munmap(data []byte) (err error) { |
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if len(data) == 0 || len(data) != cap(data) { |
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return EINVAL |
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} |
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// Find the base of the mapping. |
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p := &data[cap(data)-1] |
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m.Lock() |
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defer m.Unlock() |
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b := m.active[p] |
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if b == nil || &b[0] != &data[0] { |
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return EINVAL |
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} |
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// Unmap the memory and update m. |
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if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil { |
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return errno |
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} |
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delete(m.active, p) |
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return nil |
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} |
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func Read(fd int, p []byte) (n int, err error) { |
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n, err = read(fd, p) |
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if raceenabled { |
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if n > 0 { |
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raceWriteRange(unsafe.Pointer(&p[0]), n) |
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} |
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if err == nil { |
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raceAcquire(unsafe.Pointer(&ioSync)) |
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} |
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} |
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return |
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} |
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func Write(fd int, p []byte) (n int, err error) { |
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if raceenabled { |
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raceReleaseMerge(unsafe.Pointer(&ioSync)) |
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} |
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n, err = write(fd, p) |
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if raceenabled && n > 0 { |
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raceReadRange(unsafe.Pointer(&p[0]), n) |
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} |
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return |
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} |
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// For testing: clients can set this flag to force |
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// creation of IPv6 sockets to return EAFNOSUPPORT. |
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var SocketDisableIPv6 bool |
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type Sockaddr interface { |
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sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs |
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} |
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type SockaddrInet4 struct { |
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Port int |
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Addr [4]byte |
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raw RawSockaddrInet4 |
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} |
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type SockaddrInet6 struct { |
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Port int |
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ZoneId uint32 |
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Addr [16]byte |
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raw RawSockaddrInet6 |
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} |
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type SockaddrUnix struct { |
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Name string |
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raw RawSockaddrUnix |
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} |
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func Bind(fd int, sa Sockaddr) (err error) { |
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ptr, n, err := sa.sockaddr() |
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if err != nil { |
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return err |
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} |
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return bind(fd, ptr, n) |
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} |
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func Connect(fd int, sa Sockaddr) (err error) { |
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ptr, n, err := sa.sockaddr() |
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if err != nil { |
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return err |
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} |
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return connect(fd, ptr, n) |
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} |
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func Getpeername(fd int) (sa Sockaddr, err error) { |
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var rsa RawSockaddrAny |
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var len _Socklen = SizeofSockaddrAny |
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if err = getpeername(fd, &rsa, &len); err != nil { |
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return |
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} |
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return anyToSockaddr(&rsa) |
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} |
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func GetsockoptInt(fd, level, opt int) (value int, err error) { |
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var n int32 |
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vallen := _Socklen(4) |
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err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen) |
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return int(n), err |
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} |
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func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) { |
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var rsa RawSockaddrAny |
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var len _Socklen = SizeofSockaddrAny |
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if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil { |
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return |
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} |
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if rsa.Addr.Family != AF_UNSPEC { |
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from, err = anyToSockaddr(&rsa) |
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} |
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return |
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} |
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func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) { |
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ptr, n, err := to.sockaddr() |
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if err != nil { |
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return err |
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} |
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return sendto(fd, p, flags, ptr, n) |
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} |
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func SetsockoptByte(fd, level, opt int, value byte) (err error) { |
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return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1) |
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} |
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func SetsockoptInt(fd, level, opt int, value int) (err error) { |
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var n = int32(value) |
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return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4) |
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} |
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func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) { |
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return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4) |
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} |
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func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) { |
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return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq) |
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} |
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func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) { |
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return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq) |
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} |
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func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error { |
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return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter) |
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} |
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func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) { |
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return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger) |
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} |
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func SetsockoptString(fd, level, opt int, s string) (err error) { |
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return setsockopt(fd, level, opt, unsafe.Pointer(&[]byte(s)[0]), uintptr(len(s))) |
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} |
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func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) { |
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return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv)) |
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} |
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func Socket(domain, typ, proto int) (fd int, err error) { |
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if domain == AF_INET6 && SocketDisableIPv6 { |
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return -1, EAFNOSUPPORT |
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} |
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fd, err = socket(domain, typ, proto) |
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return |
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} |
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func Socketpair(domain, typ, proto int) (fd [2]int, err error) { |
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var fdx [2]int32 |
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err = socketpair(domain, typ, proto, &fdx) |
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if err == nil { |
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fd[0] = int(fdx[0]) |
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fd[1] = int(fdx[1]) |
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} |
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return |
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} |
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func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) { |
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if raceenabled { |
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raceReleaseMerge(unsafe.Pointer(&ioSync)) |
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} |
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return sendfile(outfd, infd, offset, count) |
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} |
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var ioSync int64 |
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func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) } |
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func SetNonblock(fd int, nonblocking bool) (err error) { |
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flag, err := fcntl(fd, F_GETFL, 0) |
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if err != nil { |
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return err |
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} |
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if nonblocking { |
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flag |= O_NONBLOCK |
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} else { |
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flag &= ^O_NONBLOCK |
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} |
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_, err = fcntl(fd, F_SETFL, flag) |
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return err |
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}
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