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. 19.\" 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 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 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 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)daemon.3 8.1 (Berkeley) 6/9/93 33.Dd June 9, 1993 34.Dt DAEMON 3 35.Os 36.Sh NAME 37.Nm daemon 38.Nd run in the background 39.Sh SYNOPSIS 40.Fd #include <stdlib.h> 41.Ft int 42.Fn daemon "int nochdir" "int noclose" 43.Sh DESCRIPTION 44.Pp 45The 46.Fn daemon 47function is for programs wishing to detach themselves from the 48controlling terminal and run in the background as system daemons. 49.Pp 50Unless the argument 51.Fa nochdir 52is non-zero, 53.Fn daemon 54changes the current working directory to the root (``/''). 55.Pp 56Unless the argument 57.Fa noclose 58is non-zero, 59.Fn daemon 60will redirect standard input, standard output and standard error 61to ``/dev/null''. 62.Sh ERRORS 63If an error occurs, 64.Fn daemon 65returns -1 and sets the global variable 66.Va errno 67to any of the errors specified for the library functions 68.Xr fork 2 69and 70.Xr setsid 2 . 71.Sh SEE ALSO 72.Xr fork 2 , 73.Xr setsid 2 74.Sh HISTORY 75The 76.Fn daemon 77function first appeared in 78.Bx 4.4 . 79