wehub-resource-sync
37 lines
756 B
Go
37 lines
756 B
Go
//go:build !windows
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package ipc
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import (
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"errors"
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"fmt"
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"os"
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"syscall"
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)
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func processAlive(pid int) (bool, error) {
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if pid <= 0 {
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return false, nil
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}
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if pid == os.Getpid() {
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return true, nil
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}
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proc, err := os.FindProcess(pid)
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if err != nil {
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return false, fmt.Errorf("probe process liveness: %w", err)
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}
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err = proc.Signal(syscall.Signal(0))
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if err == nil {
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return true, nil
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}
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// os.Process.Signal converts the kernel's ESRCH into os.ErrProcessDone.
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if errors.Is(err, os.ErrProcessDone) || errors.Is(err, syscall.ESRCH) {
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return false, nil
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}
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// EPERM means the process exists but belongs to another user.
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if errors.Is(err, syscall.EPERM) {
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return true, nil
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}
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return false, fmt.Errorf("probe process liveness: %w", err)
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}
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