processAlive function

bool processAlive(int pid)

Returns true when a process with the supplied PID is currently alive.

POSIX path uses kill -0 <pid> — the kernel only checks the process table without delivering a signal; exit 0 means alive, exit 1 means gone (or unowned).

Windows path uses tasklist /FI "PID eq <pid>" and matches the PID string in stdout.

Used by StatusCommand to differentiate running:true alive:true (process registered AND visible to the kernel) from running:true alive:false (state file recorded a PID that has since died — stale session). Public so tests can assert against the current process and against intentionally-impossible PIDs.

Implementation

bool processAlive(int pid) {
  if (Platform.isWindows) {
    final result = Process.runSync('tasklist', <String>[
      '/FI',
      'PID eq $pid',
    ]);
    return result.exitCode == 0 && result.stdout.toString().contains('$pid');
  }
  final result = Process.runSync('kill', <String>['-0', '$pid']);
  return result.exitCode == 0;
}