32 lines
646 B
Go
32 lines
646 B
Go
// The flock package provides a file-system mediated locking mechanism on linux
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// using the `flock` system call.
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package flock
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import (
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"os"
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"syscall"
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)
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// Lock gets an exclusive lock on the file at the given path. If the file
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// doesn't exist, it's created.
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func Lock(path string) (*os.File, error) {
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perm := os.O_CREATE | os.O_RDWR
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fh, err := os.OpenFile(path, perm, 0600)
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if err != nil {
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return nil, err
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}
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if err := syscall.Flock(int(fh.Fd()), syscall.LOCK_EX); err != nil {
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return nil, err
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}
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return fh, nil
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}
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// Unlock releases the lock acquired via the Lock function.
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func Unlock(f *os.File) error {
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return f.Close()
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}
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