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@(#)kill.2 4.1 (Berkeley) 05/09/85

C 4 kill - send signal to a process kill(pid, sig) Kill sends the signal sig to the process specified by the process number pid. See sigsys (2) for a list of signals.

The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user. (A single exception is the signal SIGCONT which may be sent as described in killpg (2), although it is usually sent using killpg rather than kill ).

If the process number is 0, the signal is sent to all other processes in the sender's process group; see tty (4) and also killpg (2).

If the process number is -1, and the user is the super-user, the signal is broadcast universally except to processes 0, 1, 2, the scheduler initialization, and pageout processes, and the process sending the signal.

Processes may send signals to themselves.

sigsys(2), signal(2), kill(1), killpg(2), init(8) Zero is returned if the process is killed; -1 is returned if the process does not have the same effective user ID and the user is not super-user, or if the process does not exist. (kill = 37.)

(process number in r0)

sys kill; sig