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[dragonfly.git] / lib / libc / gen / daemon.3
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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
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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
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29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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31.\"
32.\" @(#)daemon.3 8.1 (Berkeley) 6/9/93
33.\" $FreeBSD: src/lib/libc/gen/daemon.3,v 1.6.2.4 2001/12/14 18:33:50 ru Exp $
1de703da 34.\" $DragonFly: src/lib/libc/gen/daemon.3,v 1.2 2003/06/17 04:26:42 dillon Exp $
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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 LIBRARY
43.Lb libc
44.Sh SYNOPSIS
45.In stdlib.h
46.Ft int
47.Fn daemon "int nochdir" "int noclose"
48.Sh DESCRIPTION
49The
50.Fn daemon
51function is for programs wishing to detach themselves from the
52controlling terminal and run in the background as system daemons.
53.Pp
54Unless the argument
55.Fa nochdir
56is non-zero,
57.Fn daemon
58changes the current working directory to the root (``/'').
59.Pp
60Unless the argument
61.Fa noclose
62is non-zero,
63.Fn daemon
64will redirect standard input, standard output and standard error
65to ``/dev/null''.
66.Sh ERRORS
67If an error occurs,
68.Fn daemon
69returns -1 and sets the global variable
70.Va errno
71to any of the errors specified for the library functions
72.Xr fork 2
73and
74.Xr setsid 2 .
75.Sh SEE ALSO
76.Xr fork 2 ,
77.Xr setsid 2
78.Sh HISTORY
79The
80.Fn daemon
81function first appeared in
82.Bx 4.4 .