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jeremybenn |
// 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 freebsd linux netbsd openbsd windows
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package os
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import (
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"syscall"
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"time"
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)
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func sigpipe() // implemented in package runtime
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func epipecheck(file *File, e error) {
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if e == syscall.EPIPE {
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file.nepipe++
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if file.nepipe >= 10 {
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sigpipe()
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}
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} else {
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file.nepipe = 0
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}
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}
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// LinkError records an error during a link or symlink or rename
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// system call and the paths that caused it.
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type LinkError struct {
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Op string
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Old string
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New string
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Err error
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}
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func (e *LinkError) Error() string {
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return e.Op + " " + e.Old + " " + e.New + ": " + e.Err.Error()
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}
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// Link creates a hard link.
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func Link(oldname, newname string) error {
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e := syscall.Link(oldname, newname)
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if e != nil {
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return &LinkError{"link", oldname, newname, e}
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}
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return nil
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}
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// Symlink creates a symbolic link.
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func Symlink(oldname, newname string) error {
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e := syscall.Symlink(oldname, newname)
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if e != nil {
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return &LinkError{"symlink", oldname, newname, e}
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}
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return nil
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}
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// Readlink reads the contents of a symbolic link: the destination of
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// the link. It returns the contents and an error, if any.
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func Readlink(name string) (string, error) {
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for len := 128; ; len *= 2 {
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b := make([]byte, len)
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n, e := syscall.Readlink(name, b)
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if e != nil {
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return "", &PathError{"readlink", name, e}
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}
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if n < len {
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return string(b[0:n]), nil
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}
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}
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// Silence 6g.
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return "", nil
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}
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// Rename renames a file.
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func Rename(oldname, newname string) error {
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e := syscall.Rename(oldname, newname)
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if e != nil {
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return &LinkError{"rename", oldname, newname, e}
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}
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return nil
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}
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// syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
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func syscallMode(i FileMode) (o uint32) {
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o |= uint32(i.Perm())
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if i&ModeSetuid != 0 {
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o |= syscall.S_ISUID
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}
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if i&ModeSetgid != 0 {
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o |= syscall.S_ISGID
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}
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if i&ModeSticky != 0 {
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o |= syscall.S_ISVTX
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}
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// No mapping for Go's ModeTemporary (plan9 only).
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return
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}
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// Chmod changes the mode of the named file to mode.
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// If the file is a symbolic link, it changes the mode of the link's target.
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func Chmod(name string, mode FileMode) error {
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if e := syscall.Chmod(name, syscallMode(mode)); e != nil {
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return &PathError{"chmod", name, e}
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}
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return nil
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}
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// Chmod changes the mode of the file to mode.
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func (f *File) Chmod(mode FileMode) error {
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if e := syscall.Fchmod(f.fd, syscallMode(mode)); e != nil {
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return &PathError{"chmod", f.name, e}
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}
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return nil
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}
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// Chown changes the numeric uid and gid of the named file.
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// If the file is a symbolic link, it changes the uid and gid of the link's target.
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func Chown(name string, uid, gid int) error {
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if e := syscall.Chown(name, uid, gid); e != nil {
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return &PathError{"chown", name, e}
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}
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return nil
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}
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// Lchown changes the numeric uid and gid of the named file.
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// If the file is a symbolic link, it changes the uid and gid of the link itself.
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func Lchown(name string, uid, gid int) error {
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if e := syscall.Lchown(name, uid, gid); e != nil {
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return &PathError{"lchown", name, e}
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}
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return nil
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}
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// Chown changes the numeric uid and gid of the named file.
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func (f *File) Chown(uid, gid int) error {
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if e := syscall.Fchown(f.fd, uid, gid); e != nil {
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return &PathError{"chown", f.name, e}
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}
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return nil
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}
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// Truncate changes the size of the file.
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// It does not change the I/O offset.
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func (f *File) Truncate(size int64) error {
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if e := syscall.Ftruncate(f.fd, size); e != nil {
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return &PathError{"truncate", f.name, e}
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}
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return nil
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}
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// Sync commits the current contents of the file to stable storage.
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// Typically, this means flushing the file system's in-memory copy
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// of recently written data to disk.
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func (f *File) Sync() (err error) {
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if f == nil {
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return EINVAL
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}
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if e := syscall.Fsync(f.fd); e != nil {
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return NewSyscallError("fsync", e)
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}
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return nil
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}
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// Chtimes changes the access and modification times of the named
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// file, similar to the Unix utime() or utimes() functions.
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//
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// The underlying filesystem may truncate or round the values to a
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// less precise time unit.
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func Chtimes(name string, atime time.Time, mtime time.Time) error {
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var utimes [2]syscall.Timeval
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atime_ns := atime.Unix()*1e9 + int64(atime.Nanosecond())
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mtime_ns := mtime.Unix()*1e9 + int64(mtime.Nanosecond())
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utimes[0] = syscall.NsecToTimeval(atime_ns)
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utimes[1] = syscall.NsecToTimeval(mtime_ns)
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if e := syscall.Utimes(name, utimes[0:]); e != nil {
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return &PathError{"chtimes", name, e}
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}
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return nil
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}
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