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https://github.com/sipeed/picoclaw.git
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wenjie
7bf6cbe1fa
- treat `EPERM` from `signal(0)` as “process exists” on Unix - classify malformed PID files as invalid and auto-remove them during read - keep cached `pidData` only for transient races and downgrade `running` to `stopped` when the tracked process is gone - refresh PID data on WebSocket proxy requests and reject stale cached gateway state - add regression tests for invalid PID files, status downgrade, on-demand PID loading, and stale proxy rejection
30 lines
621 B
Go
30 lines
621 B
Go
//go:build !windows
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package pid
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import (
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"errors"
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"os"
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"syscall"
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)
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// isProcessRunning checks whether a process with the given PID is alive
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// on Unix-like systems using signal(0).
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func isProcessRunning(pid int) bool {
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if pid <= 0 {
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return false
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}
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p, err := os.FindProcess(pid)
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if err != nil {
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return false
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}
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// Signal(nil) does not kill the process but checks existence on Unix.
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err = p.Signal(syscall.Signal(0))
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if err == nil {
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return true
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}
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var errno syscall.Errno
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// EPERM means the process exists but we are not allowed to signal it.
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return errors.As(err, &errno) && errno == syscall.EPERM
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}
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