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Annotation of src/lib/libc/gen/daemon.3, Revision 1.2

1.1       cgd         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
                     18: .\"    without specific prior written permission.
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                     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
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                     23: .\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     24: .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25: .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26: .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27: .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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                     32: .\"    from: @(#)daemon.3    8.1 (Berkeley) 6/9/93
1.2     ! cgd        33: .\"    $Id: daemon.3,v 1.1 1994/01/27 23:58:41 cgd Exp $
1.1       cgd        34: .\"
                     35: .Dd June 9, 1993
                     36: .Dt DAEMON 3
                     37: .Os
                     38: .Sh NAME
                     39: .Nm daemon
                     40: .Nd run in the background
                     41: .Sh SYNOPSIS
1.2     ! cgd        42: .Fd #include <stdlib.h>
1.1       cgd        43: .Fn daemon "int nochdir" "int noclose"
                     44: .Sh DESCRIPTION
                     45: .Pp
                     46: The
                     47: .Fn daemon
                     48: function is for programs wishing to detach themselves from the
                     49: controlling terminal and run in the background as system daemons.
                     50: .Pp
                     51: Unless the argument
                     52: .Fa nochdir
                     53: is non-zero,
                     54: .Fn daemon
                     55: changes the current working directory to the root (``/'').
                     56: .Pp
                     57: Unless the argument
                     58: .Fa noclose
                     59: is non-zero,
                     60: .Fn daemon
                     61: will redirect standard input, standard output and standard error
                     62: to ``/dev/null''.
                     63: .Sh ERRORS
                     64: The function
                     65: .Fn daemon
                     66: may fail and set
                     67: .Va errno
                     68: for any of the errors specified for the library functions
                     69: .Xr fork 2
                     70: and
                     71: .Xr setsid 2 .
                     72: .Sh SEE ALSO
                     73: .Xr setsid 2
                     74: .Sh HISTORY
                     75: The
                     76: .Fn daemon
                     77: function first appeared in
                     78: .Bx 4.4 .