1 // Copyright 2009 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 // +build aix darwin dragonfly freebsd hurd js,wasm linux nacl netbsd openbsd solaris windows
14 func sigpipe() // implemented in package runtime
16 // syscallMode returns the syscall-specific mode bits from Go's portable mode bits.
17 func syscallMode(i FileMode) (o uint32) {
19 if i&ModeSetuid != 0 {
22 if i&ModeSetgid != 0 {
25 if i&ModeSticky != 0 {
28 // No mapping for Go's ModeTemporary (plan9 only).
32 // See docs in file.go:Chmod.
33 func chmod(name string, mode FileMode) error {
34 if e := syscall.Chmod(fixLongPath(name), syscallMode(mode)); e != nil {
35 return &PathError{"chmod", name, e}
40 // See docs in file.go:(*File).Chmod.
41 func (f *File) chmod(mode FileMode) error {
42 if err := f.checkValid("chmod"); err != nil {
45 if e := f.pfd.Fchmod(syscallMode(mode)); e != nil {
46 return f.wrapErr("chmod", e)
51 // Chown changes the numeric uid and gid of the named file.
52 // If the file is a symbolic link, it changes the uid and gid of the link's target.
53 // A uid or gid of -1 means to not change that value.
54 // If there is an error, it will be of type *PathError.
56 // On Windows or Plan 9, Chown always returns the syscall.EWINDOWS or
57 // EPLAN9 error, wrapped in *PathError.
58 func Chown(name string, uid, gid int) error {
59 if e := syscall.Chown(name, uid, gid); e != nil {
60 return &PathError{"chown", name, e}
65 // Lchown changes the numeric uid and gid of the named file.
66 // If the file is a symbolic link, it changes the uid and gid of the link itself.
67 // If there is an error, it will be of type *PathError.
69 // On Windows, it always returns the syscall.EWINDOWS error, wrapped
71 func Lchown(name string, uid, gid int) error {
72 if e := syscall.Lchown(name, uid, gid); e != nil {
73 return &PathError{"lchown", name, e}
78 // Chown changes the numeric uid and gid of the named file.
79 // If there is an error, it will be of type *PathError.
81 // On Windows, it always returns the syscall.EWINDOWS error, wrapped
83 func (f *File) Chown(uid, gid int) error {
84 if err := f.checkValid("chown"); err != nil {
87 if e := f.pfd.Fchown(uid, gid); e != nil {
88 return f.wrapErr("chown", e)
93 // Truncate changes the size of the file.
94 // It does not change the I/O offset.
95 // If there is an error, it will be of type *PathError.
96 func (f *File) Truncate(size int64) error {
97 if err := f.checkValid("truncate"); err != nil {
100 if e := f.pfd.Ftruncate(size); e != nil {
101 return f.wrapErr("truncate", e)
106 // Sync commits the current contents of the file to stable storage.
107 // Typically, this means flushing the file system's in-memory copy
108 // of recently written data to disk.
109 func (f *File) Sync() error {
110 if err := f.checkValid("sync"); err != nil {
113 if e := f.pfd.Fsync(); e != nil {
114 return f.wrapErr("sync", e)
119 // Chtimes changes the access and modification times of the named
120 // file, similar to the Unix utime() or utimes() functions.
122 // The underlying filesystem may truncate or round the values to a
123 // less precise time unit.
124 // If there is an error, it will be of type *PathError.
125 func Chtimes(name string, atime time.Time, mtime time.Time) error {
126 var utimes [2]syscall.Timespec
127 utimes[0] = syscall.NsecToTimespec(atime.UnixNano())
128 utimes[1] = syscall.NsecToTimespec(mtime.UnixNano())
129 if e := syscall.UtimesNano(fixLongPath(name), utimes[0:]); e != nil {
130 return &PathError{"chtimes", name, e}
135 // Chdir changes the current working directory to the file,
136 // which must be a directory.
137 // If there is an error, it will be of type *PathError.
138 func (f *File) Chdir() error {
139 if err := f.checkValid("chdir"); err != nil {
142 if e := f.pfd.Fchdir(); e != nil {
143 return f.wrapErr("chdir", e)
148 // setDeadline sets the read and write deadline.
149 func (f *File) setDeadline(t time.Time) error {
150 if err := f.checkValid("SetDeadline"); err != nil {
153 return f.pfd.SetDeadline(t)
156 // setReadDeadline sets the read deadline.
157 func (f *File) setReadDeadline(t time.Time) error {
158 if err := f.checkValid("SetReadDeadline"); err != nil {
161 return f.pfd.SetReadDeadline(t)
164 // setWriteDeadline sets the write deadline.
165 func (f *File) setWriteDeadline(t time.Time) error {
166 if err := f.checkValid("SetWriteDeadline"); err != nil {
169 return f.pfd.SetWriteDeadline(t)
172 // checkValid checks whether f is valid for use.
173 // If not, it returns an appropriate error, perhaps incorporating the operation name op.
174 func (f *File) checkValid(op string) error {