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.\" Copyright (c) 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)daemon.3 8.1 (Berkeley) 6/9/93
.\" Added mentioning of glibc weirdness wrt unistd.h. 5/11/98, Al Viro
.TH DAEMON 3 "June 9, 1993" "BSD MANPAGE" "Linux Programmer's Manual"
.SH NAME
daemon \- run in the background
.SH SYNOPSIS
.B #include <unistd.h>
.sp
.BI "int daemon (int " nochdir ", " int " noclose);"
.SH DESCRIPTION
The
.BR daemon ()
function is for programs wishing to detach themselves from the
controlling terminal and run in the background as system daemons.
.PP
Unless the argument
.I nochdir
is non-zero,
.BR daemon ()
changes the current working directory to the root (``/'').
.PP
Unless the argument
.I noclose
is non-zero,
.BR daemon ()
will redirect standard input, standard output and standard error
to \fI/dev/null\fP.
.SH ERRORS
If an error occurs,
.BR daemon ()
returns -1 and sets the global variable
.I errno
to any of the errors specified for the library functions
.BR fork (2)
and
.BR setsid (2).
.SH SEE ALSO
.BR fork (2),
.BR setsid (2)
.SH HISTORY
The
.BR daemon ()
function first appeared in BSD4.4.
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