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// 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 freebsd linux openbsd windows
package os
import (
"syscall"
)
func sigpipe() // implemented in package runtime
func epipecheck(file *File, e int) {
if e == syscall.EPIPE {
file.nepipe++
if file.nepipe >= 10 {
sigpipe()
}
} else {
file.nepipe = 0
}
}
// Remove removes the named file or directory.
func Remove(name string) Error {
// System call interface forces us to know
// whether name is a file or directory.
// Try both: it is cheaper on average than
// doing a Stat plus the right one.
e := syscall.Unlink(name)
if !iserror(e) {
return nil
}
e1 := syscall.Rmdir(name)
if !iserror(e1) {
return nil
}
// Both failed: figure out which error to return.
// OS X and Linux differ on whether unlink(dir)
// returns EISDIR, so can't use that. However,
// both agree that rmdir(file) returns ENOTDIR,
// so we can use that to decide which error is real.
// Rmdir might also return ENOTDIR if given a bad
// file path, like /etc/passwd/foo, but in that case,
// both errors will be ENOTDIR, so it's okay to
// use the error from unlink.
// For windows syscall.ENOTDIR is set
// to syscall.ERROR_PATH_NOT_FOUND, hopefully it should
// do the trick.
if e1 != syscall.ENOTDIR {
e = e1
}
return &PathError{"remove", name, Errno(e)}
}
// LinkError records an error during a link or symlink or rename
// system call and the paths that caused it.
type LinkError struct {
Op string
Old string
New string
Error Error
}
func (e *LinkError) String() string {
return e.Op + " " + e.Old + " " + e.New + ": " + e.Error.String()
}
// Link creates a hard link.
func Link(oldname, newname string) Error {
e := syscall.Link(oldname, newname)
if iserror(e) {
return &LinkError{"link", oldname, newname, Errno(e)}
}
return nil
}
// Symlink creates a symbolic link.
func Symlink(oldname, newname string) Error {
e := syscall.Symlink(oldname, newname)
if iserror(e) {
return &LinkError{"symlink", oldname, newname, Errno(e)}
}
return nil
}
// Readlink reads the contents of a symbolic link: the destination of
// the link. It returns the contents and an Error, if any.
func Readlink(name string) (string, Error) {
for len := 128; ; len *= 2 {
b := make([]byte, len)
n, e := syscall.Readlink(name, b)
if iserror(e) {
return "", &PathError{"readlink", name, Errno(e)}
}
if n < len {
return string(b[0:n]), nil
}
}
// Silence 6g.
return "", nil
}
// Rename renames a file.
func Rename(oldname, newname string) Error {
e := syscall.Rename(oldname, newname)
if iserror(e) {
return &LinkError{"rename", oldname, newname, Errno(e)}
}
return nil
}
// Chmod changes the mode of the named file to mode.
// If the file is a symbolic link, it changes the mode of the link's target.
func Chmod(name string, mode uint32) Error {
if e := syscall.Chmod(name, mode); iserror(e) {
return &PathError{"chmod", name, Errno(e)}
}
return nil
}
// Chmod changes the mode of the file to mode.
func (f *File) Chmod(mode uint32) Error {
if e := syscall.Fchmod(f.fd, mode); iserror(e) {
return &PathError{"chmod", f.name, Errno(e)}
}
return nil
}
// Chown changes the numeric uid and gid of the named file.
// If the file is a symbolic link, it changes the uid and gid of the link's target.
func Chown(name string, uid, gid int) Error {
if e := syscall.Chown(name, uid, gid); iserror(e) {
return &PathError{"chown", name, Errno(e)}
}
return nil
}
// Lchown changes the numeric uid and gid of the named file.
// If the file is a symbolic link, it changes the uid and gid of the link itself.
func Lchown(name string, uid, gid int) Error {
if e := syscall.Lchown(name, uid, gid); iserror(e) {
return &PathError{"lchown", name, Errno(e)}
}
return nil
}
// Chown changes the numeric uid and gid of the named file.
func (f *File) Chown(uid, gid int) Error {
if e := syscall.Fchown(f.fd, uid, gid); iserror(e) {
return &PathError{"chown", f.name, Errno(e)}
}
return nil
}
// Truncate changes the size of the file.
// It does not change the I/O offset.
func (f *File) Truncate(size int64) Error {
if e := syscall.Ftruncate(f.fd, size); iserror(e) {
return &PathError{"truncate", f.name, Errno(e)}
}
return nil
}
// Sync commits the current contents of the file to stable storage.
// Typically, this means flushing the file system's in-memory copy
// of recently written data to disk.
func (file *File) Sync() (err Error) {
if file == nil {
return EINVAL
}
if e := syscall.Fsync(file.fd); iserror(e) {
return NewSyscallError("fsync", e)
}
return nil
}
// Chtimes changes the access and modification times of the named
// file, similar to the Unix utime() or utimes() functions.
//
// The argument times are in nanoseconds, although the underlying
// filesystem may truncate or round the values to a more
// coarse time unit.
func Chtimes(name string, atime_ns int64, mtime_ns int64) Error {
var utimes [2]syscall.Timeval
utimes[0] = syscall.NsecToTimeval(atime_ns)
utimes[1] = syscall.NsecToTimeval(mtime_ns)
if e := syscall.Utimes(name, utimes[0:]); iserror(e) {
return &PathError{"chtimes", name, Errno(e)}
}
return nil
}
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