e291f464ee
- Implemented daemon.lock using flock (Unix) and LockFileEx (Windows) - Lock acquired before PID file, held for daemon lifetime - Eliminates race conditions in concurrent daemon starts - Backward compatible: falls back to PID check for old daemons - Updated isDaemonRunning() to check lock availability - All tests pass including new lock and backward compatibility tests Amp-Thread-ID: https://ampcode.com/threads/T-0e2627f4-03f9-4024-bb4b-21d23d296300 Co-authored-by: Amp <amp@ampcode.com>
36 lines
833 B
Go
36 lines
833 B
Go
//go:build windows
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package main
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import (
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"os"
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"syscall"
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"golang.org/x/sys/windows"
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)
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// flockExclusive acquires an exclusive non-blocking lock on the file using LockFileEx
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func flockExclusive(f *os.File) error {
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// LOCKFILE_EXCLUSIVE_LOCK (2) | LOCKFILE_FAIL_IMMEDIATELY (1) = 3
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const flags = windows.LOCKFILE_EXCLUSIVE_LOCK | windows.LOCKFILE_FAIL_IMMEDIATELY
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// Create overlapped structure for the entire file
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ol := &windows.Overlapped{}
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// Lock entire file (0xFFFFFFFF, 0xFFFFFFFF = maximum range)
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err := windows.LockFileEx(
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windows.Handle(f.Fd()),
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flags,
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0, // reserved
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0xFFFFFFFF, // number of bytes to lock (low)
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0xFFFFFFFF, // number of bytes to lock (high)
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ol,
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)
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if err == windows.ERROR_LOCK_VIOLATION || err == syscall.EWOULDBLOCK {
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return ErrDaemonLocked
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}
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return err
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}
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