1.\" $OpenBSD: daemon.3,v 1.7 1999/09/22 22:01:25 aaron Exp $ 2.\" 3.\" Copyright (c) 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.Dd June 9, 1993 35.Dt DAEMON 3 36.Os 37.Sh NAME 38.Nm daemon 39.Nd run in the background 40.Sh SYNOPSIS 41.Fd #include <stdlib.h> 42.Ft int 43.Fn daemon "int nochdir" "int noclose" 44.Sh DESCRIPTION 45The 46.Fn daemon 47function is for programs wishing to detach themselves from the 48controlling terminal and run in the background as system daemons. 49.Pp 50Unless the argument 51.Fa nochdir 52is non-zero, 53.Fn daemon 54changes the current working directory to the root 55.Pq Pa / . 56.Pp 57Unless the argument 58.Fa noclose 59is non-zero, 60.Fn daemon 61will redirect standard input, standard output and standard error to 62.Pa /dev/null . 63.Sh RETURN VALUES 64Upon success, 65.Fn daemon 66returns 0; otherwise \-1 is returned. 67.Sh ERRORS 68The function 69.Fn daemon 70may fail and set 71.Va errno 72for any of the errors specified for the library functions 73.Xr fork 2 74and 75.Xr setsid 2 . 76.Sh SEE ALSO 77.Xr fork 2 , 78.Xr setsid 2 79.Sh HISTORY 80The 81.Fn daemon 82function first appeared in 83.Bx 4.4 . 84