// 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 aix darwin dragonfly freebsd linux netbsd openbsd solaris package unix import ( "bytes" "runtime" "sort" "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 } // ErrnoName returns the error name for error number e. func ErrnoName(e syscall.Errno) string { i := sort.Search(len(errorList), func(i int) bool { return errorList[i].num >= e }) if i < len(errorList) && errorList[i].num == e { return errorList[i].name } return "" } // SignalName returns the signal name for signal number s. func SignalName(s syscall.Signal) string { i := sort.Search(len(signalList), func(i int) bool { return signalList[i].num >= s }) if i < len(signalList) && signalList[i].num == s { return signalList[i].name } return "" } // clen returns the index of the first NULL byte in n or len(n) if n contains no NULL byte. func clen(n []byte) int { i := bytes.IndexByte(n, 0) if i == -1 { i = len(n) } return i } // 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 // Sockaddr represents a socket address. type Sockaddr interface { sockaddr() (ptr unsafe.Pointer, len _Socklen, err error) // lowercase; only we can define Sockaddrs } // SockaddrInet4 implements the Sockaddr interface for AF_INET type sockets. type SockaddrInet4 struct { Port int Addr [4]byte raw RawSockaddrInet4 } // SockaddrInet6 implements the Sockaddr interface for AF_INET6 type sockets. type SockaddrInet6 struct { Port int ZoneId uint32 Addr [16]byte raw RawSockaddrInet6 } // SockaddrUnix implements the Sockaddr interface for AF_UNIX type sockets. 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(fd, &rsa) } func GetsockoptByte(fd, level, opt int) (value byte, err error) { var n byte vallen := _Socklen(1) err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen) return n, err } 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 GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) { vallen := _Socklen(4) err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen) return value, err } func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) { var value IPMreq vallen := _Socklen(SizeofIPMreq) err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) return &value, err } func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) { var value IPv6Mreq vallen := _Socklen(SizeofIPv6Mreq) err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) return &value, err } func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) { var value IPv6MTUInfo vallen := _Socklen(SizeofIPv6MTUInfo) err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) return &value, err } func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) { var value ICMPv6Filter vallen := _Socklen(SizeofICMPv6Filter) err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen) return &value, err } func GetsockoptLinger(fd, level, opt int) (*Linger, error) { var linger Linger vallen := _Socklen(SizeofLinger) err := getsockopt(fd, level, opt, unsafe.Pointer(&linger), &vallen) return &linger, err } func GetsockoptTimeval(fd, level, opt int) (*Timeval, error) { var tv Timeval vallen := _Socklen(unsafe.Sizeof(tv)) err := getsockopt(fd, level, opt, unsafe.Pointer(&tv), &vallen) return &tv, 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(fd, &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 } // Exec calls execve(2), which replaces the calling executable in the process // tree. argv0 should be the full path to an executable ("/bin/ls") and the // executable name should also be the first argument in argv (["ls", "-l"]). // envv are the environment variables that should be passed to the new // process (["USER=go", "PWD=/tmp"]). func Exec(argv0 string, argv []string, envv []string) error { return syscall.Exec(argv0, argv, envv) }