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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 1993-06-09 "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 "RETURN VALUE"
+(This function forks, and if the
+.B fork()
+succeeds, the parent does
+.\" not .IR in order not to underline _
+.BR _exit (0),
+so that further errors are seen by the child only.)
+On success zero will be returned.
+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 NOTES
+The glibc implementation can also return \-1 when
+.I /dev/null
+exists but is not a character device with the expected
+major and minor numbers. In this case
+.I errno
+need not be set.
+.SH HISTORY
+The
+.BR daemon ()
+function first appeared in BSD4.4.