1994-11-30 11:34:58 +03:00
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.\" $NetBSD: wait.1,v 1.2 1994/11/30 08:35:03 jtc Exp $
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.\"
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1994-11-30 11:32:28 +03:00
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.\" Copyright (c) 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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.\" @(#)wait.1 8.1 (Berkeley) 6/5/93
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.\"
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.Dd June 5, 1993
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.Dt WAIT 1
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.Os
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.Sh NAME
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.Nm wait
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.Nd await process completion
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.Sh SYNOPSIS
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.Nm wait
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.Op Ar pid
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.Sh DESCRIPTION
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If invoked with no arguments, the
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.Nm wait
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utility waits until
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all existing child processes in the background
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have terminated.
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.Pp
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Available operands:
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.Bl -tag -width Ds
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.It Ar pid
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If a
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.Ar pid
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operand is specified, and it is the process ID of a
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background child process that still exists, the
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.Nm wait
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utility
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waits until that process has completed and consumes its
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status information, without consuming the status information
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of any other process.
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.Pp
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If a pid operand is specified that is not the process ID of
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a child background process that still exists,
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.Nm wait
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exits
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without waiting for any processes to complete.
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.El
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.Pp
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The
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.Nm wait
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utility exits with one of the following values:
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.Bl -tag -width Ds
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.It \&0
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The
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.Nm wait
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utility was invoked with no operands and
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all of the existing background child processes have
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terminated, or the process specified by the pid
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operand exited normally with 0 as its exit status.
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.It \&>\&0
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The specified process did not exist and its exit
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status information was not available, or the specified
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process existed or its exit status information
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was available, and it terminated with a non-zero
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exit status.
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.El
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.Pp
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If the specified process terminated abnormally due
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to the receipt of a signal, the exit status
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information of
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.Nm wait
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contains that termination status as
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well.
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.Sh STANDARDS
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The
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.Nm wait
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command is expected to be
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.St -p1003.2
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compatible.
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