1.\" Copyright (c) 1999 Berkeley Software Design, Inc. All rights reserved. 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 3. Berkeley Software Design Inc's name may not be used to endorse or 12.\" promote products derived from this software without specific prior 13.\" written permission. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND 16.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18.\" ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE 19.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.\" $FreeBSD$ 28.\" 29.Dd February 19, 2012 30.Dt DAEMON 8 31.Os 32.Sh NAME 33.Nm daemon 34.Nd run detached from the controlling terminal 35.Sh SYNOPSIS 36.Nm 37.Op Fl cf 38.Op Fl p Ar pidfile 39.Op Fl u Ar user 40.Ar command arguments ... 41.Sh DESCRIPTION 42The 43.Nm 44utility detaches itself from the controlling terminal and 45executes the program specified by its arguments. 46Privileges may be lowered to the specified user. 47.Pp 48The options are as follows: 49.Bl -tag -width indent 50.It Fl c 51Change the current working directory to the root 52.Pq Dq Pa / . 53.It Fl f 54Redirect standard input, standard output and standard error to 55.Pa /dev/null . 56.It Fl p Ar file 57Write the ID of the created process into the 58.Ar file 59using the 60.Xr pidfile 3 61functionality. 62The program is executed in a spawned child process while the 63.Nm 64waits until it terminates to keep the 65.Ar file 66locked and removes it after the process exits. 67The 68.Ar file 69owner is the user who runs the 70.Nm 71regardless of whether the 72.Fl u 73option is used or not. 74.It Fl r 75Supervise and restart the program if it has been terminated. 76.It Fl u Ar user 77Login name of the user to execute the program under. 78Requires adequate superuser privileges. 79.El 80.Pp 81If the 82.Fl p 83or 84.Fl r 85option is specified the program is executed in a spawned child process. 86The 87.Nm 88waits until it terminates to keep the pid file locked and removes it 89after the process exits or restarts the program. 90In this case if the monitoring 91.Nm 92receives software termination signal (SIGTERM) it forwards it to the 93spawned process. 94Normally it will cause the child to exit followed by the termination 95of the supervising process after removing the pidfile. 96.Sh EXIT STATUS 97The 98.Nm 99utility exits 1 if an error is returned by the 100.Xr daemon 3 101library routine, 2 if the 102.Ar pidfile 103is requested, but cannot be opened, 3 if process is already running (pidfile 104exists and is locked), 105otherwise 0. 106.Sh DIAGNOSTICS 107If the command cannot be executed, an error message is displayed on 108standard error unless the 109.Fl f 110flag is specified. 111.Sh SEE ALSO 112.Xr setregid 2 , 113.Xr setreuid 2 , 114.Xr daemon 3 , 115.Xr exec 3 , 116.Xr pidfile 3 , 117.Xr termios 4 , 118.Xr tty 4 119.Sh HISTORY 120The 121.Nm 122utility first appeared in 123.Fx 4.7 . 124