1.\" Copyright (c) 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)daemon.3 8.1 (Berkeley) 6/9/93 33.\" $Id: daemon.3,v 1.2 1994/12/18 04:26:06 cgd Exp $ 34.\" 35.Dd June 9, 1993 36.Dt DAEMON 3 37.Os 38.Sh NAME 39.Nm daemon 40.Nd run in the background 41.Sh SYNOPSIS 42.Fd #include <stdlib.h> 43.Fn daemon "int nochdir" "int noclose" 44.Sh DESCRIPTION 45.Pp 46The 47.Fn daemon 48function is for programs wishing to detach themselves from the 49controlling terminal and run in the background as system daemons. 50.Pp 51Unless the argument 52.Fa nochdir 53is non-zero, 54.Fn daemon 55changes the current working directory to the root (``/''). 56.Pp 57Unless the argument 58.Fa noclose 59is non-zero, 60.Fn daemon 61will redirect standard input, standard output and standard error 62to ``/dev/null''. 63.Sh ERRORS 64The function 65.Fn daemon 66may fail and set 67.Va errno 68for any of the errors specified for the library functions 69.Xr fork 2 70and 71.Xr setsid 2 . 72.Sh SEE ALSO 73.Xr setsid 2 74.Sh HISTORY 75The 76.Fn daemon 77function first appeared in 78.Bx 4.4 . 79