1.\" $NetBSD: daemon.3,v 1.3 1995/02/25 13:41:12 cgd 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.\" @(#)daemon.3 8.1 (Berkeley) 6/9/93 35.\" 36.Dd June 9, 1993 37.Dt DAEMON 3 38.Os 39.Sh NAME 40.Nm daemon 41.Nd run in the background 42.Sh SYNOPSIS 43.Fd #include <stdlib.h> 44.Fn daemon "int nochdir" "int noclose" 45.Sh DESCRIPTION 46.Pp 47The 48.Fn daemon 49function is for programs wishing to detach themselves from the 50controlling terminal and run in the background as system daemons. 51.Pp 52Unless the argument 53.Fa nochdir 54is non-zero, 55.Fn daemon 56changes the current working directory to the root (``/''). 57.Pp 58Unless the argument 59.Fa noclose 60is non-zero, 61.Fn daemon 62will redirect standard input, standard output and standard error 63to ``/dev/null''. 64.Sh ERRORS 65The function 66.Fn daemon 67may fail and set 68.Va errno 69for any of the errors specified for the library functions 70.Xr fork 2 71and 72.Xr setsid 2 . 73.Sh SEE ALSO 74.Xr setsid 2 75.Sh HISTORY 76The 77.Fn daemon 78function first appeared in 79.Bx 4.4 . 80