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程智超0668000959
a90d8d35ee
isProcessRunning() previously only checked whether a PID existed via signal(0)/OpenProcess, without confirming the process was actually picoclaw. When the PID was reused by an unrelated process (e.g., systemd-resolved after a kill -9), the gateway would refuse to start with 'already running'. Add isPicoclawProcess() that verifies the process name matches picoclaw: - Unix: reads /proc/<pid>/comm - Windows: calls QueryFullProcessImageNameW If the running process is not picoclaw, treat the PID file as stale and proceed with normal startup. Falls back to trusting the liveness check when identity verification is unavailable (e.g., /proc unreadable, API call fails). Fixes #2720.
45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
//go:build !windows
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package pid
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import (
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"errors"
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"fmt"
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"os"
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"strings"
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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(0) 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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// isPicoclawProcess reads /proc/<pid>/comm to confirm the process name
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// contains "picoclaw". Returns false when the comm file can be read and
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// the name does not match (e.g., PID was reused by an unrelated process).
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// Returns true if /proc/<pid>/comm is unreadable so the call site falls
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// back to trusting the liveness check alone.
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func isPicoclawProcess(pid int) bool {
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data, err := os.ReadFile(fmt.Sprintf("/proc/%d/comm", pid))
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if err != nil {
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return true // cannot verify — trust liveness check
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}
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return strings.Contains(strings.TrimSpace(string(data)), "picoclaw")
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}
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