V4/man/man2/kill.2

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.th KILL II 8/5/73
.sh NAME
kill \*- send signal to a process
.sh SYNOPSIS
(kill = 37.; not in assembler)
.br
(process number in r0)
.br
.ft B
sys kill; sig
.ft R
.sh DESCRIPTION
.it Kill
sends the signal
.it sig
to the process specified by the
process number in r0.
See signal(II) for a list of signals.
.s3
The sending and receiving processes must
have the same controlling typewriter, otherwise
this call is restricted to the super-user.
.sh "SEE ALSO"
signal(II), kill(I)
.sh DIAGNOSTICS
The error bit (c-bit)
is set if the process does not
have the same controlling typewriter and the
user is not super-user, or if the process
does not exist.
.sh BUGS
Equality between the controlling
typewriters of the sending and receiving process
is neither a necessary nor sufficient
condition for allowing the sending of a signal.
The correct condition is equality of user IDs.