5c35171af3
UNIX signalling semantics require that processes in the same session always be able to deliver SIGCONT to one another, overriding the remaining protections. Fix SIGCONT special case description similar to rev. 1.22 kill.2. PR: docs/58710 Submitted by: Ryan Younce MFC after: 2 weeks
103 lines
3.2 KiB
Groff
103 lines
3.2 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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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 October 10, 2006
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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 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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.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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