V6/usr/man/man2/kill.2

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.th KILL II 12/15/74
.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
.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 signal (II) for a list of signals.
.s3
The sending and receiving processes must
have the same effective user ID, otherwise
this call is restricted to the super-user.
.s3
If the process number is 0,
the signal is sent to all other processes which have the
same controlling typewriter and user ID.
.s3
In no case is it possible for a process to kill itself.
.sh "SEE ALSO"
signal (II), kill (I)
.sh DIAGNOSTICS
The error bit (c-bit)
is set 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.
From C, \-1 is returned.