mirror of https://github.com/mkerrisk/man-pages
116 lines
4.0 KiB
Groff
116 lines
4.0 KiB
Groff
.\" Copyright (c) 1980, 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)killpg.2 6.5 (Berkeley) 3/10/91
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.\"
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.\" Modified Fri Jul 23 21:55:01 1993 by Rik Faith <faith@cs.unc.edu>
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.\" Modified Tue Oct 22 08:11:14 EDT 1996 by Eric S. Raymond <esr@thyrsus.com>
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.\" Modified 2004-06-16 by Michael Kerrisk <mtk-manpages@gmx.net>
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.\" Added notes on CAP_KILL
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.\" Modified 2004-06-21 by aeb
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.\"
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.TH KILLPG 2 2004-06-21 "BSD Man Page" "Linux Programmer's Manual"
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.SH NAME
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killpg \- send signal to a process group
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.SH SYNOPSIS
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.B #include <signal.h>
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.sp
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.BI "int killpg(int " pgrp ", int " sig );
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.SH DESCRIPTION
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.BR killpg ()
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sends the signal
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.I sig
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to the process group
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.IR pgrp .
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See
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.BR signal (7)
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for a list of signals.
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If
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.I pgrp
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is 0,
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.BR killpg ()
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sends the signal to the sending process's process group.
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(POSIX says: If
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.I pgrp
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is less than or equal to 1, the behaviour is undefined.)
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For a process to have permission to send a signal
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it must either be privileged (under Linux: have the
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.B CAP_KILL
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capability), or the real or effective
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user ID of the sending process must equal the real or
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saved set-user-ID of the target process.
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In the case of SIGCONT it suffices when the sending and receiving
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processes belong to the same session.
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.SH "RETURN VALUE"
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On success, zero is returned.
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On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EINVAL
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.I Sig
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is not a valid signal number.
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.TP
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.B EPERM
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The process does not have permission to send the signal
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to any of the target processes.
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.TP
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.B ESRCH
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No process can be found in the process group specified by
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.IR pgrp .
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.TP
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.B ESRCH
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The process group was given as 0 but the sending process does not
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have a process group.
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.SH NOTES
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There are various differences between the permission checking
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in BSD-type systems and System V-type systems.
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See the POSIX rationale
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for
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.BR kill ().
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A difference not mentioned by POSIX concerns the return
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value EPERM: BSD documents that no signal is sent and EPERM returned
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when the permission check failed for at least one target process,
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while POSIX documents EPERM only when the permission check failed
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for all target processes.
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.SH "CONFORMING TO"
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SVr4, 4.4BSD (The
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.BR killpg ()
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function call first appeared in 4BSD), POSIX.1-2001.
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.SH "SEE ALSO"
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.BR getpgrp (2),
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.BR kill (2),
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.BR signal (2),
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.BR capabilities (7)
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