1994-05-27 05:00:24 +00:00
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. 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 8.1 (Berkeley) 6/2/93
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.\"
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.Dd June 2, 1993
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.Dt KILLPG 2
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.Os BSD 4
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.Sh NAME
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.Nm killpg
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.Nd send signal to a process group
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.Sh SYNOPSIS
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.Fd #include <signal.h>
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.Ft int
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.Fn killpg "pid_t pgrp" "int sig"
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.Sh DESCRIPTION
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.Fn Killpg
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sends the signal
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.Fa sig
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to the process group
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.Fa pgrp .
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See
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.Xr sigaction 2
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for a list of signals.
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If
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.Fa pgrp
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is 0,
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.Fn killpg
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sends the signal to the sending process's process group.
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.Pp
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The sending process and members of the process group must
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have the same effective user ID, or
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the sender must be the super-user.
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As a single special case the continue signal SIGCONT may be sent
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to any process that is a descendant of the current process.
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.Sh RETURN VALUES
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Upon successful completion, a value of 0 is returned. Otherwise,
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a value of -1 is returned and the global variable
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.Va errno
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is set to indicate the error.
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.Sh ERRORS
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.Fn Killpg
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will fail and no signal will be sent if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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.Fa Sig
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is not a valid signal number.
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.It Bq Er ESRCH
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No process can be found in the process group specified by
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.Fa pgrp .
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.It Bq Er ESRCH
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The process group was given as 0
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but the sending process does not have a process group.
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.It Bq Er EPERM
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The sending process is not the super-user and one or more
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of the target processes has an effective user ID different from that
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of the sending process.
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.El
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.Sh SEE ALSO
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.Xr getpgrp 2 ,
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1997-01-20 23:10:39 +00:00
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.Xr kill 2 ,
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1994-05-27 05:00:24 +00:00
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.Xr sigaction 2
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.Sh HISTORY
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The
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1996-08-22 22:05:59 +00:00
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.Fn killpg
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1994-05-27 05:00:24 +00:00
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function call appeared in
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.Bx 4.0 .
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