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-.\" Copyright (c) 1980, 1991 Regents of the University of California.
-.\" All rights reserved.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\"     @(#)killpg.2	6.5 (Berkeley) 3/10/91
-.\"
-.\" Modified Fri Jul 23 21:55:01 1993 by Rik Faith <faith@cs.unc.edu>
-.\" Modified Tue Oct 22 08:11:14 EDT 1996 by Eric S. Raymond <esr@thyrsus.com>
-.\" Modified 2004-06-16 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"     Added notes on CAP_KILL
-.\" Modified 2004-06-21 by aeb
-.\"
-.TH killpg 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-killpg \- send signal to a process group
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <signal.h>
-.P
-.BI "int killpg(int " pgrp ", int " sig );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR killpg ():
-.nf
-    _XOPEN_SOURCE >= 500
-.\"    || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE
-.fi
-.SH DESCRIPTION
-.BR killpg ()
-sends the signal
-.I sig
-to the process group
-.IR pgrp .
-See
-.BR signal (7)
-for a list of signals.
-.P
-If
-.I pgrp
-is 0,
-.BR killpg ()
-sends the signal to the calling process's process group.
-(POSIX says: if
-.I pgrp
-is less than or equal to 1, the behavior is undefined.)
-.P
-For the permissions required to send a signal to another process, see
-.BR kill (2).
-.SH RETURN VALUE
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EINVAL
-.I sig
-is not a valid signal number.
-.TP
-.B EPERM
-The process does not have permission to send the signal
-to any of the target processes.
-For the required permissions, see
-.BR kill (2).
-.TP
-.B ESRCH
-No process can be found in the process group specified by
-.IR pgrp .
-.TP
-.B ESRCH
-The process group was given as 0 but the sending process does not
-have a process group.
-.SH VERSIONS
-There are various differences between the permission checking
-in BSD-type systems and System\ V-type systems.
-See the POSIX rationale for
-.BR kill (3p).
-A difference not mentioned by POSIX concerns the return
-value
-.BR EPERM :
-BSD documents that no signal is sent and
-.B EPERM
-returned when the permission check failed for at least one target process,
-while POSIX documents
-.B EPERM
-only when the permission check failed for all target processes.
-.SS C library/kernel differences
-On Linux,
-.BR killpg ()
-is implemented as a library function that makes the call
-.IR "kill(\-pgrp,\ sig)" .
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, SVr4, 4.4BSD
-(first appeared in 4BSD).
-.SH SEE ALSO
-.BR getpgrp (2),
-.BR kill (2),
-.BR signal (2),
-.BR capabilities (7),
-.BR credentials (7)