Send a signal to a process

Arguments

• pid - Specifies which processes should receive the signal.
  • If positive, specifies an individual process.
  • If zero, the signal will be sent to all processes whose group ID is equal to the process group ID of the sender. This is a variant of killpg.
  • If -1 and the process has super-user privileges, the signal is sent to all processes exclusing system processes.
  • If less than -1, the signal is sent to all processes whose process group ID is equal to the absolute value of pid.
• signal - Signal to send. If None, error checking is performed but no signal is actually sent.

See Also kill(2)