| // Copyright 2009 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // +build darwin dragonfly freebsd linux netbsd openbsd solaris |
| |
| package unix |
| |
| import ( |
| "runtime" |
| "sync" |
| "syscall" |
| "unsafe" |
| ) |
| |
| var ( |
| Stdin = 0 |
| Stdout = 1 |
| Stderr = 2 |
| ) |
| |
| const ( |
| darwin64Bit = runtime.GOOS == "darwin" && sizeofPtr == 8 |
| dragonfly64Bit = runtime.GOOS == "dragonfly" && sizeofPtr == 8 |
| netbsd32Bit = runtime.GOOS == "netbsd" && sizeofPtr == 4 |
| solaris64Bit = runtime.GOOS == "solaris" && sizeofPtr == 8 |
| ) |
| |
| // Do the interface allocations only once for common |
| // Errno values. |
| var ( |
| errEAGAIN error = syscall.EAGAIN |
| errEINVAL error = syscall.EINVAL |
| errENOENT error = syscall.ENOENT |
| ) |
| |
| // errnoErr returns common boxed Errno values, to prevent |
| // allocations at runtime. |
| func errnoErr(e syscall.Errno) error { |
| switch e { |
| case 0: |
| return nil |
| case EAGAIN: |
| return errEAGAIN |
| case EINVAL: |
| return errEINVAL |
| case ENOENT: |
| return errENOENT |
| } |
| return e |
| } |
| |
| // Mmap manager, for use by operating system-specific implementations. |
| |
| type mmapper struct { |
| sync.Mutex |
| active map[*byte][]byte // active mappings; key is last byte in mapping |
| mmap func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error) |
| munmap func(addr uintptr, length uintptr) error |
| } |
| |
| func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) { |
| if length <= 0 { |
| return nil, EINVAL |
| } |
| |
| // Map the requested memory. |
| addr, errno := m.mmap(0, uintptr(length), prot, flags, fd, offset) |
| if errno != nil { |
| return nil, errno |
| } |
| |
| // Slice memory layout |
| var sl = struct { |
| addr uintptr |
| len int |
| cap int |
| }{addr, length, length} |
| |
| // Use unsafe to turn sl into a []byte. |
| b := *(*[]byte)(unsafe.Pointer(&sl)) |
| |
| // Register mapping in m and return it. |
| p := &b[cap(b)-1] |
| m.Lock() |
| defer m.Unlock() |
| m.active[p] = b |
| return b, nil |
| } |
| |
| func (m *mmapper) Munmap(data []byte) (err error) { |
| if len(data) == 0 || len(data) != cap(data) { |
| return EINVAL |
| } |
| |
| // Find the base of the mapping. |
| p := &data[cap(data)-1] |
| m.Lock() |
| defer m.Unlock() |
| b := m.active[p] |
| if b == nil || &b[0] != &data[0] { |
| return EINVAL |
| } |
| |
| // Unmap the memory and update m. |
| if errno := m.munmap(uintptr(unsafe.Pointer(&b[0])), uintptr(len(b))); errno != nil { |
| return errno |
| } |
| delete(m.active, p) |
| return nil |
| } |
| |
| func Read(fd int, p []byte) (n int, err error) { |
| n, err = read(fd, p) |
| if raceenabled { |
| if n > 0 { |
| raceWriteRange(unsafe.Pointer(&p[0]), n) |
| } |
| if err == nil { |
| raceAcquire(unsafe.Pointer(&ioSync)) |
| } |
| } |
| return |
| } |
| |
| func Write(fd int, p []byte) (n int, err error) { |
| if raceenabled { |
| raceReleaseMerge(unsafe.Pointer(&ioSync)) |
| } |
| n, err = write(fd, p) |
| if raceenabled && n > 0 { |
| raceReadRange(unsafe.Pointer(&p[0]), n) |
| } |
| return |
| } |
| |
| // For testing: clients can set this flag to force |
| // creation of IPv6 sockets to return EAFNOSUPPORT. |
| var SocketDisableIPv6 bool |
| |
| type Sockaddr interface { |
| sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs |
| } |
| |
| type SockaddrInet4 struct { |
| Port int |
| Addr [4]byte |
| raw RawSockaddrInet4 |
| } |
| |
| type SockaddrInet6 struct { |
| Port int |
| ZoneId uint32 |
| Addr [16]byte |
| raw RawSockaddrInet6 |
| } |
| |
| type SockaddrUnix struct { |
| Name string |
| raw RawSockaddrUnix |
| } |
| |
| func Bind(fd int, sa Sockaddr) (err error) { |
| ptr, n, err := sa.sockaddr() |
| if err != nil { |
| return err |
| } |
| return bind(fd, ptr, n) |
| } |
| |
| func Connect(fd int, sa Sockaddr) (err error) { |
| ptr, n, err := sa.sockaddr() |
| if err != nil { |
| return err |
| } |
| return connect(fd, ptr, n) |
| } |
| |
| func Getpeername(fd int) (sa Sockaddr, err error) { |
| var rsa RawSockaddrAny |
| var len _Socklen = SizeofSockaddrAny |
| if err = getpeername(fd, &rsa, &len); err != nil { |
| return |
| } |
| return anyToSockaddr(&rsa) |
| } |
| |
| func GetsockoptInt(fd, level, opt int) (value int, err error) { |
| var n int32 |
| vallen := _Socklen(4) |
| err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen) |
| return int(n), err |
| } |
| |
| func Recvfrom(fd int, p []byte, flags int) (n int, from Sockaddr, err error) { |
| var rsa RawSockaddrAny |
| var len _Socklen = SizeofSockaddrAny |
| if n, err = recvfrom(fd, p, flags, &rsa, &len); err != nil { |
| return |
| } |
| if rsa.Addr.Family != AF_UNSPEC { |
| from, err = anyToSockaddr(&rsa) |
| } |
| return |
| } |
| |
| func Sendto(fd int, p []byte, flags int, to Sockaddr) (err error) { |
| ptr, n, err := to.sockaddr() |
| if err != nil { |
| return err |
| } |
| return sendto(fd, p, flags, ptr, n) |
| } |
| |
| func SetsockoptByte(fd, level, opt int, value byte) (err error) { |
| return setsockopt(fd, level, opt, unsafe.Pointer(&value), 1) |
| } |
| |
| func SetsockoptInt(fd, level, opt int, value int) (err error) { |
| var n = int32(value) |
| return setsockopt(fd, level, opt, unsafe.Pointer(&n), 4) |
| } |
| |
| func SetsockoptInet4Addr(fd, level, opt int, value [4]byte) (err error) { |
| return setsockopt(fd, level, opt, unsafe.Pointer(&value[0]), 4) |
| } |
| |
| func SetsockoptIPMreq(fd, level, opt int, mreq *IPMreq) (err error) { |
| return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPMreq) |
| } |
| |
| func SetsockoptIPv6Mreq(fd, level, opt int, mreq *IPv6Mreq) (err error) { |
| return setsockopt(fd, level, opt, unsafe.Pointer(mreq), SizeofIPv6Mreq) |
| } |
| |
| func SetsockoptICMPv6Filter(fd, level, opt int, filter *ICMPv6Filter) error { |
| return setsockopt(fd, level, opt, unsafe.Pointer(filter), SizeofICMPv6Filter) |
| } |
| |
| func SetsockoptLinger(fd, level, opt int, l *Linger) (err error) { |
| return setsockopt(fd, level, opt, unsafe.Pointer(l), SizeofLinger) |
| } |
| |
| func SetsockoptString(fd, level, opt int, s string) (err error) { |
| return setsockopt(fd, level, opt, unsafe.Pointer(&[]byte(s)[0]), uintptr(len(s))) |
| } |
| |
| func SetsockoptTimeval(fd, level, opt int, tv *Timeval) (err error) { |
| return setsockopt(fd, level, opt, unsafe.Pointer(tv), unsafe.Sizeof(*tv)) |
| } |
| |
| func Socket(domain, typ, proto int) (fd int, err error) { |
| if domain == AF_INET6 && SocketDisableIPv6 { |
| return -1, EAFNOSUPPORT |
| } |
| fd, err = socket(domain, typ, proto) |
| return |
| } |
| |
| func Socketpair(domain, typ, proto int) (fd [2]int, err error) { |
| var fdx [2]int32 |
| err = socketpair(domain, typ, proto, &fdx) |
| if err == nil { |
| fd[0] = int(fdx[0]) |
| fd[1] = int(fdx[1]) |
| } |
| return |
| } |
| |
| func Sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) { |
| if raceenabled { |
| raceReleaseMerge(unsafe.Pointer(&ioSync)) |
| } |
| return sendfile(outfd, infd, offset, count) |
| } |
| |
| var ioSync int64 |
| |
| func CloseOnExec(fd int) { fcntl(fd, F_SETFD, FD_CLOEXEC) } |
| |
| func SetNonblock(fd int, nonblocking bool) (err error) { |
| flag, err := fcntl(fd, F_GETFL, 0) |
| if err != nil { |
| return err |
| } |
| if nonblocking { |
| flag |= O_NONBLOCK |
| } else { |
| flag &= ^O_NONBLOCK |
| } |
| _, err = fcntl(fd, F_SETFL, flag) |
| return err |
| } |
