435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
431 lines
11 KiB
Go
431 lines
11 KiB
Go
// 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 aix darwin dragonfly freebsd linux netbsd openbsd solaris
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package unix
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import (
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"bytes"
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"sort"
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"sync"
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"syscall"
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"unsafe"
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"golang.org/x/sys/internal/unsafeheader"
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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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// 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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var (
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signalNameMapOnce sync.Once
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signalNameMap map[string]syscall.Signal
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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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// ErrnoName returns the error name for error number e.
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func ErrnoName(e syscall.Errno) string {
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i := sort.Search(len(errorList), func(i int) bool {
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return errorList[i].num >= e
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})
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if i < len(errorList) && errorList[i].num == e {
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return errorList[i].name
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}
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return ""
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}
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// SignalName returns the signal name for signal number s.
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func SignalName(s syscall.Signal) string {
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i := sort.Search(len(signalList), func(i int) bool {
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return signalList[i].num >= s
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})
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if i < len(signalList) && signalList[i].num == s {
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return signalList[i].name
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}
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return ""
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}
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// SignalNum returns the syscall.Signal for signal named s,
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// or 0 if a signal with such name is not found.
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// The signal name should start with "SIG".
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func SignalNum(s string) syscall.Signal {
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signalNameMapOnce.Do(func() {
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signalNameMap = make(map[string]syscall.Signal, len(signalList))
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for _, signal := range signalList {
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signalNameMap[signal.name] = signal.num
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}
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})
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return signalNameMap[s]
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}
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// clen returns the index of the first NULL byte in n or len(n) if n contains no NULL byte.
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func clen(n []byte) int {
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i := bytes.IndexByte(n, 0)
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if i == -1 {
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i = len(n)
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}
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return i
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}
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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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// Use unsafe to convert addr into a []byte.
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var b []byte
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hdr := (*unsafeheader.Slice)(unsafe.Pointer(&b))
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hdr.Data = unsafe.Pointer(addr)
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hdr.Cap = length
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hdr.Len = length
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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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// Sockaddr represents a socket address.
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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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// SockaddrInet4 implements the Sockaddr interface for AF_INET type sockets.
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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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// SockaddrInet6 implements the Sockaddr interface for AF_INET6 type sockets.
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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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// SockaddrUnix implements the Sockaddr interface for AF_UNIX type sockets.
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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(fd, &rsa)
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}
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func GetsockoptByte(fd, level, opt int) (value byte, err error) {
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var n byte
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vallen := _Socklen(1)
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err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
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return n, err
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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 GetsockoptInet4Addr(fd, level, opt int) (value [4]byte, err error) {
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vallen := _Socklen(4)
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err = getsockopt(fd, level, opt, unsafe.Pointer(&value[0]), &vallen)
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return value, err
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}
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func GetsockoptIPMreq(fd, level, opt int) (*IPMreq, error) {
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var value IPMreq
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vallen := _Socklen(SizeofIPMreq)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
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return &value, err
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}
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func GetsockoptIPv6Mreq(fd, level, opt int) (*IPv6Mreq, error) {
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var value IPv6Mreq
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vallen := _Socklen(SizeofIPv6Mreq)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
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return &value, err
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}
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func GetsockoptIPv6MTUInfo(fd, level, opt int) (*IPv6MTUInfo, error) {
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var value IPv6MTUInfo
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vallen := _Socklen(SizeofIPv6MTUInfo)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
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return &value, err
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}
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func GetsockoptICMPv6Filter(fd, level, opt int) (*ICMPv6Filter, error) {
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var value ICMPv6Filter
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vallen := _Socklen(SizeofICMPv6Filter)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&value), &vallen)
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return &value, err
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}
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func GetsockoptLinger(fd, level, opt int) (*Linger, error) {
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var linger Linger
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vallen := _Socklen(SizeofLinger)
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err := getsockopt(fd, level, opt, unsafe.Pointer(&linger), &vallen)
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return &linger, err
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}
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func GetsockoptTimeval(fd, level, opt int) (*Timeval, error) {
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var tv Timeval
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vallen := _Socklen(unsafe.Sizeof(tv))
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err := getsockopt(fd, level, opt, unsafe.Pointer(&tv), &vallen)
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return &tv, err
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}
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func GetsockoptUint64(fd, level, opt int) (value uint64, err error) {
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var n uint64
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vallen := _Socklen(8)
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err = getsockopt(fd, level, opt, unsafe.Pointer(&n), &vallen)
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return 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(fd, &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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var p unsafe.Pointer
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if len(s) > 0 {
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p = unsafe.Pointer(&[]byte(s)[0])
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}
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return setsockopt(fd, level, opt, p, 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 SetsockoptUint64(fd, level, opt int, value uint64) (err error) {
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return setsockopt(fd, level, opt, unsafe.Pointer(&value), 8)
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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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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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// Exec calls execve(2), which replaces the calling executable in the process
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// tree. argv0 should be the full path to an executable ("/bin/ls") and the
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// executable name should also be the first argument in argv (["ls", "-l"]).
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// envv are the environment variables that should be passed to the new
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// process (["USER=go", "PWD=/tmp"]).
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func Exec(argv0 string, argv []string, envv []string) error {
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return syscall.Exec(argv0, argv, envv)
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}
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// Lutimes sets the access and modification times tv on path. If path refers to
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// a symlink, it is not dereferenced and the timestamps are set on the symlink.
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// If tv is nil, the access and modification times are set to the current time.
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// Otherwise tv must contain exactly 2 elements, with access time as the first
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// element and modification time as the second element.
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func Lutimes(path string, tv []Timeval) error {
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if tv == nil {
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return UtimesNanoAt(AT_FDCWD, path, nil, AT_SYMLINK_NOFOLLOW)
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}
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if len(tv) != 2 {
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return EINVAL
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}
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ts := []Timespec{
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NsecToTimespec(TimevalToNsec(tv[0])),
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NsecToTimespec(TimevalToNsec(tv[1])),
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}
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return UtimesNanoAt(AT_FDCWD, path, ts, AT_SYMLINK_NOFOLLOW)
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}
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