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