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164 lines
4.5 KiB
Groff
164 lines
4.5 KiB
Groff
.\" Copyright (c) 1999 Berkeley Software Design, Inc. 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. Berkeley Software Design Inc's name may not be used to endorse or
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.\" promote products derived from this software without specific prior
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.\" written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``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 BERKELEY SOFTWARE DESIGN INC 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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.\" $FreeBSD$
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.\"
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.Dd September 13, 2013
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.Dt DAEMON 8
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.Os
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.Sh NAME
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.Nm daemon
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.Nd run detached from the controlling terminal
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.Sh SYNOPSIS
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.Nm
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.Op Fl cfr
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.Op Fl p Ar child_pidfile
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.Op Fl P Ar supervisor_pidfile
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.Op Fl u Ar user
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.Ar command arguments ...
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.Sh DESCRIPTION
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The
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.Nm
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utility detaches itself from the controlling terminal and
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executes the program specified by its arguments.
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Privileges may be lowered to the specified user.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl c
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Change the current working directory to the root
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.Pq Dq Pa / .
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.It Fl f
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Redirect standard input, standard output and standard error to
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.Pa /dev/null .
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.It Fl p Ar child_pidfile
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Write the ID of the created process into the
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.Ar child_pidfile
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using the
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.Xr pidfile 3
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functionality.
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The program is executed in a spawned child process while the
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.Nm
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waits until it terminates to keep the
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.Ar child_pidfile
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locked and removes it after the process exits.
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The
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.Ar child_pidfile
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owner is the user who runs the
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.Nm
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regardless of whether the
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.Fl u
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option is used or not.
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.It Fl P Ar supervisor_pidfile
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Write the ID of the
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.Nm
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process into the
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.Ar supervisor_pidfile
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using the
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.Xr pidfile 3
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functionality.
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The program is executed in a spawned child process while the
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.Nm
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waits until it terminates to keep the
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.Ar supervisor_pidfile
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locked and removes it after the process exits.
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The
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.Ar supervisor_pidfile
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owner is the user who runs the
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.Nm
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regardless of whether the
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.Fl u
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option is used or not.
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.It Fl r
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Supervise and restart the program if it has been terminated.
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.It Fl u Ar user
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Login name of the user to execute the program under.
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Requires adequate superuser privileges.
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.El
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.Pp
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If the
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.Fl p ,
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.Fl P
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or
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.Fl r
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option is specified the program is executed in a spawned child process.
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The
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.Nm
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waits until it terminates to keep the pid file(s) locked and removes them
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after the process exits or restarts the program.
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In this case if the monitoring
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.Nm
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receives software termination signal (SIGTERM) it forwards it to the
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spawned process.
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Normally it will cause the child to exit, remove the pidfile(s)
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and then terminate.
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.Pp
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The
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.Fl P
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option is useful combined with the
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.Fl r
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option as
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.Ar supervisor_pidfile
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contains the ID of the supervisor
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not the child. This is especially important if you use
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.Fl r
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in an rc script as the
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.Fl p
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option will give you the child's ID to signal when you attempt to
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stop the service, causing
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.Nm
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to restart the child.
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.Sh EXIT STATUS
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The
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.Nm
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utility exits 1 if an error is returned by the
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.Xr daemon 3
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library routine, 2 if
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.Ar child_pidfile
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or
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.Ar supervisor_pidfile
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is requested, but cannot be opened, 3 if process is already running (pidfile
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exists and is locked),
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otherwise 0.
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.Sh DIAGNOSTICS
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If the command cannot be executed, an error message is displayed on
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standard error unless the
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.Fl f
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flag is specified.
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.Sh SEE ALSO
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.Xr setregid 2 ,
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.Xr setreuid 2 ,
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.Xr daemon 3 ,
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.Xr exec 3 ,
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.Xr pidfile 3 ,
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.Xr termios 4 ,
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.Xr tty 4
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Fx 4.7 .
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