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1a7c9e1585
Two examples showed '$?' alone on a line, which should be '$ echo $?'. The third example got it right. Fix the first two.
154 lines
3.8 KiB
Groff
154 lines
3.8 KiB
Groff
.\"
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.\" Copyright (c) 2004-2009, Jilles Tjoelker
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with
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.\" or without modification, are permitted provided that the
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.\" following conditions are met:
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.\"
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.\" 1. Redistributions of source code must retain the above
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.\" copyright notice, this list of conditions and the
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.\" following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the
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.\" above copyright notice, this list of conditions and
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.\" the following disclaimer in the documentation and/or
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.\" other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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.\" CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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.\" PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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.\" COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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.\" PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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.\" NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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.\" USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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.\" OF SUCH DAMAGE.
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.\"
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.Dd January 21, 2021
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.Dt PWAIT 1
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.Os
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.Sh NAME
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.Nm pwait
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.Nd wait for processes to terminate
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.Sh SYNOPSIS
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.Nm
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.Op Fl t Ar duration
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.Op Fl ov
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.Ar pid
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\&...
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.Sh DESCRIPTION
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The
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.Nm
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utility will wait until each of the given processes has terminated.
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.Pp
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The following option is available:
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.Bl -tag -width indent
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.It Fl o
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Exit when any of the given processes has terminated.
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.It Fl t Ar duration
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If any process is still running after
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.Ar duration ,
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.Nm
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will exit.
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The
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.Ar duration
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value can be integer or decimal numbers.
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Values without unit symbols are interpreted as seconds.
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.Pp
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Supported unit symbols are:
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.Bl -tag -width indent -compact
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.It s
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seconds
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.It m
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minutes
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.It h
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hours
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.El
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.It Fl v
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Print the exit status when each process terminates or
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.Ql timeout
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if the timer goes off earlier.
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.El
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.Sh EXIT STATUS
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The
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.Nm
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utility exits 0 on success, and >0 if an error occurs.
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.Pp
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If the
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.Fl t
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flag is specified and a timeout occurs, the exit status will be 124.
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.Pp
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Invalid pids elicit a warning message but are otherwise ignored.
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.Sh EXAMPLES
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Start two
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.Xr sleep 1
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processes in the background.
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The first one will sleep for 30 seconds and the second one for one hour.
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Wait for any of them to finish but no more than 5 seconds.
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Since a timeout occurs the exit status is 124:
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.Bd -literal -offset indent
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$ sleep 30 & sleep 3600 &
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[1] 1646
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[2] 1647
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$ pwait -o -t5 1646 1647
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$ echo $?
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124
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.Ed
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.Pp
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Same as above but try to obtain the exit status of the processes.
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In this case
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.Ql timeout
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is shown and the exit status is 124:
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.Bd -literal -offset indent
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$ sleep 30 & sleep 3600 &
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[1] 1652
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[2] 1653
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$ pwait -v -t 5 1652 1653
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timeout
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$ echo $?
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124
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.Ed
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.Pp
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Start two
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.Xr sleep 1
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processes in the background sleeping for 30 and 40 seconds respectively.
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Wait 60 seconds for any of them to finish and get their exit codes:
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.Bd -literal -offset indent
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$ sleep 30 & sleep 40 &
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[1] 1674
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[2] 1675
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$ pwait -v -t 60 1674 1675
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1674: exited with status 0.
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1675: exited with status 0.
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[1]- Done sleep 30
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[2]+ Done sleep 40
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$ echo $?
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0
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.Ed
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.Sh SEE ALSO
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.Xr kill 1 ,
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.Xr pkill 1 ,
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.Xr ps 1 ,
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.Xr wait 1 ,
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.Xr kqueue 2
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.Sh NOTES
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.Nm
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is not a substitute for the
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.Xr wait 1
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builtin
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as it will not clean up any zombies or state in the parent process.
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.Pp
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To avoid deadlock,
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.Nm
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will ignore its own pid, if it is provided as a process id to wait for.
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.Sh HISTORY
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A
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.Nm
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command first appeared in SunOS 5.8.
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