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https://github.com/kovidgoyal/kitty.git
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51 lines
849 B
Go
51 lines
849 B
Go
// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
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package utils
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import (
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"errors"
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"fmt"
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"io/fs"
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"os"
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"golang.org/x/sys/unix"
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)
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var _ = fmt.Print
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func lock(fd, op int, path string) (err error) {
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for {
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err = unix.Flock(fd, op)
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if !errors.Is(err, unix.EINTR) {
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break
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}
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}
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if err != nil {
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opname := "exclusive flock()"
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switch op {
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case unix.LOCK_UN:
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opname = "unlock flock()"
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case unix.LOCK_SH:
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opname = "shared flock()"
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}
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return &fs.PathError{
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Op: opname,
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Path: path,
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Err: err,
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}
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}
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return nil
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}
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func LockFileShared(f *os.File) error {
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return lock(int(f.Fd()), unix.LOCK_SH, f.Name())
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}
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func LockFileExclusive(f *os.File) error {
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return lock(int(f.Fd()), unix.LOCK_EX, f.Name())
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}
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func UnlockFile(f *os.File) error {
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return lock(int(f.Fd()), unix.LOCK_UN, f.Name())
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}
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