Signal Handling--ref

Thepidspecifies the process or process group to receive the signal:

pid> 0

The process whose identifier ispid.

pid== 0

All processes in the same process group as the sender.

pid< -1

The process group whose identifier is -pid.

pid== -1

If the process is privileged,send the signal to all processes except for some special system processes. Otherwise,send the signal to all processes with the same effective user ID.

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