PWB1/usr/man/man2/kill.2

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.th KILL II 5/31/77
.sh NAME
kill  \*-  send signal to a process
.sh SYNOPSIS
(kill = 37.)
.br
(process number in r0)
.br
.ft B
sys kill; sig
.s3
kill(pid, sig);
.ft R
.sh DESCRIPTION
.it Kill
sends the signal
.it sig
to the process specified by the
process number in r0.
See
.it signal\^\c
(II) for a list of signals.
.s3
The sending and receiving processes must
have the same effective user ID.
The super-user can kill any process.
.s3
If the process number is 0,
the signal is sent to all processes which have the
same process group number as the sender.
If the process number is less than 0, the signal
is sent to all processes for which the sender has permission.
In both of the above cases, process 0 and process 1 are excluded.
Note, process 0 is really the scheduler, and process numbers must
be positive to avoid confusion with error indications in C.
.sh "SEE ALSO"
kill(I), signal(II)
.sh DIAGNOSTICS
The error bit (c-bit)
is set if the process does not
have permission, or if the process does not exist.
From C, a \*-1 return indicates an error.