1.\" $NetBSD: wait.1,v 1.3 2002/02/13 08:17:26 ross Exp $ 2.\" 3.\" Copyright (c) 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)wait.1 8.1 (Berkeley) 6/5/93 35.\" 36.Dd June 5, 1993 37.Dt WAIT 1 38.Os 39.Sh NAME 40.Nm wait 41.Nd await process completion 42.Sh SYNOPSIS 43.Nm wait 44.Op Ar pid 45.Sh DESCRIPTION 46If invoked with no arguments, the 47.Nm wait 48utility waits until 49all existing child processes in the background 50have terminated. 51.Pp 52Available operands: 53.Bl -tag -width Ds 54.It Ar pid 55If a 56.Ar pid 57operand is specified, and it is the process ID of a 58background child process that still exists, the 59.Nm wait 60utility 61waits until that process has completed and consumes its 62status information, without consuming the status information 63of any other process. 64.Pp 65If a pid operand is specified that is not the process ID of 66a child background process that still exists, 67.Nm wait 68exits 69without waiting for any processes to complete. 70.El 71.Pp 72The 73.Nm wait 74utility exits with one of the following values: 75.Bl -tag -width Ds 76.It \&0 77The 78.Nm wait 79utility was invoked with no operands and 80all of the existing background child processes have 81terminated, or the process specified by the pid 82operand exited normally with 0 as its exit status. 83.It \&\*[Gt]\&0 84The specified process did not exist and its exit 85status information was not available, or the specified 86process existed or its exit status information 87was available, and it terminated with a non-zero 88exit status. 89.El 90.Pp 91If the specified process terminated abnormally due 92to the receipt of a signal, the exit status 93information of 94.Nm wait 95contains that termination status as 96well. 97.Sh STANDARDS 98The 99.Nm wait 100command is expected to be 101.St -p1003.2 102compatible. 103