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Import timeout(1) from NetBSD

The timeout(1) utility can be used to run commands with a time limit.

OK deraadt@ beck@

.\"	$NetBSD: timeout.1,v 1.4 2016/10/13 06:22:26 dholland Exp $
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.\" Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org>
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.\" $FreeBSD: head/usr.bin/timeout/timeout.1 268861 2014-07-18 22:56:59Z bapt $
.\"
.Dd July 19, 2014
.Dt TIMEOUT 1
.Os
.Sh NAME
.Nm timeout
.Nd run a command with a time limit
.Sh SYNOPSIS
.Nm
.Op Fl Fl signal Ar sig | Fl s Ar sig
.Op Fl Fl preserve-status
.Op Fl Fl kill-after Ar time | Fl k Ar time
.Op Fl Fl foreground
.Ao Ar duration Ac
.Ao Ar command Ac
.Ao Ar args ... Ac
.Sh DESCRIPTION
.Nm
starts the
.Ar command
with its
.Ar args .
If
.Ar command
is still running after
.Ar duration ,
it is killed.
By default,
.Dv SIGTERM
is sent.
.Bl -tag -width "-k time, --kill-after time"
.It Fl Fl preserve-status
Always exits with the same status as
.Ar command
even if it times out.
.It Fl Fl foreground
Do not propagate timeout to the
.Ar command
children.
.It Fl s Ar sig , Fl Fl signal Ar sig
Specify the signal to send on timeout.
By default,
.Dv SIGTERM
is sent.
.It Fl k Ar time , Fl Fl kill-after Ar time
Send a second kill signal if
.Ar command
is still running after
.Ar time
after the first signal was sent.
.El
.Sh DURATION FORMAT
.Ar duration
and
.Ar time
can be integer or decimal numbers.
Values without unit symbols are interpreted as seconds.
.Pp
Supported unit symbols are:
.Bl -tag -width indent -compact
.It s
seconds
.It m
minutes
.It h
hours
.It d
days
.El
.Sh EXIT STATUS
If the timeout was not reached, the exit status of
.Ar command
is returned.
.Pp
If the timeout was reached and
.Fl Fl preserve-status
is set, the exit status of
.Ar command
is returned.
If
.Fl Fl preserve-status
is not set, an exit status of 124 is returned.
.Pp
If
.Ar command
exits after receiving a signal, the exit status returned is the signal number plus 128.
.Sh SEE ALSO
.Xr kill 1 ,
.Xr signal 3
.Sh HISTORY
A
.Nm
utility appeared in a development branch of
.Fx 11
and was imported into
.Nx 7 .
The
.Fx
work is compatible with GNU
.Nm
by
.An Padraig Brady ,
from GNU Coreutils 8.21.
The
.Nm
utility first appeared in GNU Coreutils 7.0.