fsx

func AppendLineLocked ¶

func AppendLineLocked(path string, line []byte, mode os.FileMode) error

AppendLineLocked appends exactly one line to a file with a cross-process lock. The caller provides raw bytes for one record; this function appends a trailing newline and fsyncs the file before returning.

func WithFileLock ¶ added in v1.7.0

func WithFileLock(path string, fn func() error) error

WithFileLock serializes a read/validate/write critical section across processes using the same lock-file protocol as AppendLineLocked.

func WriteFileAtomic ¶

func WriteFileAtomic(path string, content []byte, mode os.FileMode) error