timeout(1) is used by /etc/rc.d/zfskeys. Unfortunately, having
timeout(1) installed in /usr/bin causes problems when /usr is an
encrypted ZFS partition.
Implementing timeout(1) in sh(1) is not trivial. A more elegant solution
is to move timeout(1) to /bin so that it is available to early services
in the boot process.
PR: 265221
Reviewed by: allanjude, des, imp
Approved by: allanjude, des, imp
Reported by: Ivan <r4@sovserv.ru>
Fixes: 33ff39796f
Add zfskeys rc.d script for auto-loading encryption keys
MFC after: 1 week
Relnotes: yes
Sponsored by: Modirum MDPay
Sponsored by: Klara Inc.
Differential Revision: https://reviews.freebsd.org/D38344
207 lines
4.6 KiB
Groff
207 lines
4.6 KiB
Groff
.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
.\"
|
|
.\" Copyright (c) 2014 Baptiste Daroussin <bapt@FreeBSD.org>
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd October 21, 2021
|
|
.Dt TIMEOUT 1
|
|
.Os
|
|
.Sh NAME
|
|
.Nm timeout
|
|
.Nd run a command with a time limit
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl -signal Ar sig | Fl s Ar sig
|
|
.Op Fl -preserve-status
|
|
.Op Fl -kill-after Ar time | Fl k Ar time
|
|
.Op Fl -foreground
|
|
.Ar duration
|
|
.Ar command
|
|
.Op Ar args ...
|
|
.Sh DESCRIPTION
|
|
.Nm
|
|
starts the
|
|
.Ar command
|
|
with its
|
|
.Ar args .
|
|
If the
|
|
.Ar command
|
|
is still running after
|
|
.Ar duration ,
|
|
it is killed.
|
|
By default,
|
|
.Dv SIGTERM
|
|
is sent.
|
|
The special
|
|
.Ar duration ,
|
|
zero, signifies no limit.
|
|
Therefore a signal is never sent if
|
|
.Ar duration
|
|
is 0.
|
|
.Pp
|
|
The options are as follows:
|
|
.Bl -tag -width indent
|
|
.It Fl -preserve-status
|
|
Exit with the same status as
|
|
.Ar command ,
|
|
even if it times out and is killed.
|
|
.It Fl -foreground
|
|
Do not propagate timeout to the children of
|
|
.Ar command .
|
|
.It Fl s Ar sig , Fl -signal Ar sig
|
|
Specify the signal to send on timeout.
|
|
By default,
|
|
.Dv SIGTERM
|
|
is sent.
|
|
.It Fl k Ar time , Fl -kill-after Ar time
|
|
Send a
|
|
.Dv SIGKILL
|
|
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
|
|
are non-negative integer or real (decimal) numbers, with an optional
|
|
unit-specifying suffix.
|
|
Values without an explicit unit are interpreted as seconds.
|
|
.Pp
|
|
Supported unit symbols are:
|
|
.Bl -tag -width indent -compact
|
|
.It Cm s
|
|
seconds
|
|
.It Cm m
|
|
minutes
|
|
.It Cm h
|
|
hours
|
|
.It Cm 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 -preserve-status
|
|
is set, the exit status of
|
|
.Ar command
|
|
is returned.
|
|
If
|
|
.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.
|
|
.Pp
|
|
If
|
|
.Ar command
|
|
refers to a non-existing program, the exit status returned is 127.
|
|
.Pp
|
|
If
|
|
.Ar command
|
|
is an otherwise invalid program, the exit status returned is 126.
|
|
.Pp
|
|
If an invalid parameter is passed to
|
|
.Fl s
|
|
or
|
|
.Fl k ,
|
|
the exit status returned is 125.
|
|
.Sh EXAMPLES
|
|
Run
|
|
.Xr sleep 1
|
|
with a time limit of 4 seconds.
|
|
Since the command completes in 2 seconds, the exit status is 0:
|
|
.Bd -literal -offset indent
|
|
$ timeout 4 sleep 2
|
|
$ echo $?
|
|
0
|
|
.Ed
|
|
.Pp
|
|
Run
|
|
.Xr sleep 1
|
|
for 4 seconds and terminate process after 2 seconds.
|
|
124 is returned since no
|
|
.Fl -preserve-status
|
|
is used:
|
|
.Bd -literal -offset indent
|
|
$ timeout 2 sleep 4
|
|
$ echo $?
|
|
124
|
|
.Ed
|
|
.Pp
|
|
Same as above but preserving status.
|
|
Exit status is 128 + signal number (15 for
|
|
.Va SIGTERM ) :
|
|
.Bd -literal -offset indent
|
|
$ timeout --preserve-status 2 sleep 4
|
|
$ echo $?
|
|
143
|
|
.Ed
|
|
.Pp
|
|
Same as above but sending
|
|
.Va SIGALRM
|
|
(signal number 14) instead of
|
|
.Va SIGTERM :
|
|
.Bd -literal -offset indent
|
|
$ timeout --preserve-status -s SIGALRM 2 sleep 4
|
|
$ echo $?
|
|
142
|
|
.Ed
|
|
.Pp
|
|
Try to
|
|
.Xr fetch 1
|
|
the PDF version of the
|
|
.Fx
|
|
Handbook.
|
|
Send a
|
|
.Va SIGTERM
|
|
signal after 1 minute and send a
|
|
.Va SIGKILL
|
|
signal 5 seconds later if the process refuses to stop:
|
|
.Bd -literal -offset indent
|
|
$ timeout -k 5s 1m fetch \\
|
|
> https://download.freebsd.org/ftp/doc/en/books/handbook/book.pdf
|
|
.Ed
|
|
.Sh SEE ALSO
|
|
.Xr kill 1 ,
|
|
.Xr signal 3
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
command first appeared in
|
|
.Fx 10.3 .
|
|
.Sh AUTHORS
|
|
.An Baptiste Daroussin Aq Mt bapt@FreeBSD.org
|
|
and
|
|
.An Vsevolod Stakhov Aq Mt vsevolod@FreeBSD.org
|