NetBSD/lib/libc/gen/daemon.3

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.\" $NetBSD: daemon.3,v 1.11 2002/02/07 07:00:11 ross Exp $
.\"
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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
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" @(#)daemon.3 8.1 (Berkeley) 6/9/93
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.\"
.Dd September 3, 1999
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.Dt DAEMON 3
.Os
.Sh NAME
.Nm daemon
.Nd run in the background
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.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
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.Fd #include \*[Lt]stdlib.h\*[Gt]
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.Ft int
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.Fn daemon "int nochdir" "int noclose"
.Sh DESCRIPTION
The
.Fn 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
.Fa nochdir
is non-zero,
.Fn daemon
changes the current working directory to the root
.Po
.Pa /
.Pc .
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.Pp
Unless the argument
.Fa noclose
is non-zero,
.Fn daemon
will redirect standard input, standard output and standard error
to
.Pa /dev/null .
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.Sh RETURN VALUES
On return 0 indicates success with -1 indicating error.
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.Sh ERRORS
The function
.Fn daemon
may fail and set
.Va errno
for any of the errors specified for the library functions
.Xr fork 2
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and
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.Xr setsid 2 .
.Sh SEE ALSO
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.Xr fork 2 ,
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.Xr setsid 2
.Sh HISTORY
The
.Fn daemon
function first appeared in
.Bx 4.4 .
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.Sh BUGS
.Fn daemon
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uses
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.Fn fork
as part of its tty detachment mechanism. Consequently the process id changes
when
.Fn daemon
is invoked. Processes employing
.Fn daemon
can not be reliably waited
upon until
.Fn daemon
has been invoked.