39 lines
882 B
Go
39 lines
882 B
Go
//go:build !windows
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// +build !windows
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package statemgr
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import (
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"io"
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"log"
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"syscall"
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)
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// use fcntl POSIX locks for the most consistent behavior across platforms, and
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// hopefully some campatibility over NFS and CIFS.
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func (s *Filesystem) lock() error {
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log.Printf("[TRACE] statemgr.Filesystem: locking %s using fcntl flock", s.path)
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flock := &syscall.Flock_t{
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Type: syscall.F_RDLCK | syscall.F_WRLCK,
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Whence: int16(io.SeekStart),
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Start: 0,
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Len: 0,
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}
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fd := s.stateFileOut.Fd()
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return syscall.FcntlFlock(fd, syscall.F_SETLK, flock)
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}
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func (s *Filesystem) unlock() error {
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log.Printf("[TRACE] statemgr.Filesystem: unlocking %s using fcntl flock", s.path)
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flock := &syscall.Flock_t{
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Type: syscall.F_UNLCK,
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Whence: int16(io.SeekStart),
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Start: 0,
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Len: 0,
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}
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fd := s.stateFileOut.Fd()
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return syscall.FcntlFlock(fd, syscall.F_SETLK, flock)
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}
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