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Annotation of researchv10dc/man/manb/killpg.2j, revision 1.1.1.1

1.1       root        1: .TH KILLPG 2J
                      2: .UC 4
                      3: .SH NAME
                      4: killpg \- send signal to a process or a process group
                      5: .SH SYNOPSIS
                      6: .B killpg(pgrp, sig)
                      7: .PP
                      8: .B cc ... \-ljobs
                      9: .SH DESCRIPTION
                     10: .I Killpg
                     11: sends the signal
                     12: .I sig
                     13: to the specified process group.
                     14: See
                     15: .IR sigsys (2)
                     16: for a list of signals;
                     17: see
                     18: .IR jobs (3)
                     19: for an explanation of process groups.
                     20: .PP
                     21: The sending process and members of the process group must
                     22: have the same effective user ID, otherwise
                     23: this call is restricted to the super-user.
                     24: As a single special case the continue signal SIGCONT may be sent
                     25: to any process which is a descendant of the current process.  This
                     26: allows a command interpreter such as
                     27: .IR csh (1)
                     28: to restart set-user-id processes stopped from the keyboard with a stop signal.
                     29: .PP
                     30: The calls
                     31: .IP
                     32: .B "killpg(0, sig)"
                     33: .LP
                     34: and
                     35: .IP
                     36: .B "kill(0, sig)
                     37: .LP
                     38: have identical effects, sending the signal to all members of the
                     39: invoker's process group (including the process itself).
                     40: It is preferable to use the call involving
                     41: .I kill
                     42: in this case, as it is portable to other UNIX systems.
                     43: .SH "SEE ALSO"
                     44: jobs(3), kill(2), sigsys(2), signal(2), csh(1), kill(1)
                     45: .SH DIAGNOSTICS
                     46: Zero is returned if the processes are sent the signals;
                     47: \-1 is returned if any process in the process group cannot be sent
                     48: the signal, or if there are no members in the process group.
                     49: .SH BUGS
                     50: The job control facilities are not available in standard version 7 UNIX.
                     51: These facilities are still under development and may change in future
                     52: releases of the system as better inter-process communication facilities
                     53: and support for virtual terminals become available.  The options and
                     54: specifications of this system call and even the call itself
                     55: are thus subject to change.

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