2002-02-07 10:00:09 +03:00
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.\" $NetBSD: daemon.3,v 1.11 2002/02/07 07:00:11 ross Exp $
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1995-02-25 16:40:51 +03:00
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.\"
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1994-01-28 02:58:34 +03:00
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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1995-02-25 16:40:51 +03:00
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.\" @(#)daemon.3 8.1 (Berkeley) 6/9/93
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1994-01-28 02:58:34 +03:00
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.\"
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1999-09-12 22:47:10 +04:00
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.Dd September 3, 1999
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1994-01-28 02:58:34 +03:00
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.Dt DAEMON 3
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.Os
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.Sh NAME
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.Nm daemon
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.Nd run in the background
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1998-02-05 21:45:17 +03:00
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.Sh LIBRARY
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.Lb libc
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1994-01-28 02:58:34 +03:00
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.Sh SYNOPSIS
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2002-02-07 10:00:09 +03:00
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.Fd #include \*[Lt]stdlib.h\*[Gt]
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1999-03-14 21:10:02 +03:00
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.Ft int
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1994-01-28 02:58:34 +03:00
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.Fn daemon "int nochdir" "int noclose"
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.Sh DESCRIPTION
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The
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.Fn daemon
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function is for programs wishing to detach themselves from the
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controlling terminal and run in the background as system daemons.
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.Pp
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Unless the argument
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.Fa nochdir
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is non-zero,
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.Fn daemon
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2001-09-16 06:57:03 +04:00
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changes the current working directory to the root
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.Po
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.Pa /
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.Pc .
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1994-01-28 02:58:34 +03:00
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.Pp
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Unless the argument
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.Fa noclose
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is non-zero,
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.Fn daemon
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will redirect standard input, standard output and standard error
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2001-09-16 06:57:03 +04:00
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to
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.Pa /dev/null .
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1999-09-03 17:12:44 +04:00
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.Sh RETURN VALUES
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On return 0 indicates success with -1 indicating error.
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1994-01-28 02:58:34 +03:00
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.Sh ERRORS
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The function
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.Fn daemon
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may fail and set
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.Va errno
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for any of the errors specified for the library functions
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.Xr fork 2
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2001-09-16 06:30:23 +04:00
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and
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1994-01-28 02:58:34 +03:00
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.Xr setsid 2 .
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.Sh SEE ALSO
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1998-10-06 10:31:41 +04:00
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.Xr fork 2 ,
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1994-01-28 02:58:34 +03:00
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.Xr setsid 2
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.Sh HISTORY
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The
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.Fn daemon
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function first appeared in
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.Bx 4.4 .
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1999-09-03 17:12:44 +04:00
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.Sh BUGS
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.Fn daemon
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2001-09-16 06:30:23 +04:00
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uses
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1999-09-03 17:12:44 +04:00
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.Fn fork
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as part of its tty detachment mechanism. Consequently the process id changes
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when
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.Fn daemon
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is invoked. Processes employing
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.Fn daemon
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can not be reliably waited
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upon until
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.Fn daemon
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has been invoked.
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