effed41a0b
Just like kill(2), it is impossible for killpg(0, ...) to fail with ESRCH, as a process always has a process group. Discussed on: arch@ MFC after: 1 week
96 lines
2.9 KiB
Groff
96 lines
2.9 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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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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.\" $FreeBSD$
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.\"
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.Dd March 15, 2012
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.Dt KILLPG 2
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.Os
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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 LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In 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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The
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.Fn killpg
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function
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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 with the same session ID as the caller.
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.Sh RETURN VALUES
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.Rv -std killpg
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.Sh ERRORS
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The
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.Fn killpg
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function
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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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The
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.Fa sig
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argument
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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 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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.Xr kill 2 ,
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.Xr sigaction 2
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.Sh HISTORY
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The
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.Fn killpg
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function appeared in
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.Bx 4.0 .
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