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kill - send signal to a process
Kill sends the signal sig to the process specified by the process number in r0. See sig-
nal(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.
If the process number is 0, the signal is sent to all other processes in the sender's
process group; see tty(4).
If the process number is -1, and the user is the super-user, the signal is broadcast uni-
versally except to processes 0 and 1, the scheduler and initialization processes, see
Processes may send signals to themselves.
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
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