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-'\" t
-.\" Copyright (c) 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" SPDX-License-Identifier: BSD-4-Clause-UC
-.\"
-.\"	@(#)daemon.3	8.1 (Berkeley) 6/9/93
-.\" Added mentioning of glibc weirdness wrt unistd.h. 5/11/98, Al Viro
-.TH daemon 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-daemon \- run in the background
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.BI "int daemon(int " nochdir ", int " noclose );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR daemon ():
-.nf
-    Since glibc 2.21:
-.\"             commit 266865c0e7b79d4196e2cc393693463f03c90bd8
-        _DEFAULT_SOURCE
-    In glibc 2.19 and 2.20:
-        _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
-    Up to and including glibc 2.19:
-        _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
-.fi
-.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.
-.P
-If
-.I nochdir
-is zero,
-.BR daemon ()
-changes the process's current working directory
-to the root directory ("/");
-otherwise, the current working directory is left unchanged.
-.P
-If
-.I noclose
-is zero,
-.BR daemon ()
-redirects standard input, standard output, and standard error
-to
-.IR /dev/null ;
-otherwise, no changes are made to these file descriptors.
-.SH RETURN VALUE
-(This function forks, and if the
-.BR fork (2)
-succeeds, the parent calls
-.\" not .IR in order not to underline _
-.BR _exit (2),
-so that further errors are seen by the child only.)
-On success
-.BR daemon ()
-returns zero.
-If an error occurs,
-.BR daemon ()
-returns \-1 and sets
-.I errno
-to any of the errors specified for the
-.BR fork (2)
-and
-.BR setsid (2).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR daemon ()
-T}	Thread safety	MT-Safe
-.TE
-.SH VERSIONS
-A similar function appears on the BSDs.
-.P
-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 STANDARDS
-None.
-.SH HISTORY
-4.4BSD.
-.SH BUGS
-The GNU C library implementation of this function was taken from BSD,
-and does not employ the double-fork technique (i.e.,
-.BR fork (2),
-.BR setsid (2),
-.BR fork (2))
-that is necessary to ensure that the resulting daemon process is
-not a session leader.
-Instead, the resulting daemon
-.I is
-a session leader.
-.\" FIXME . https://sourceware.org/bugzilla/show_bug.cgi?id=19144
-.\" Tested using a program that uses daemon() and then opens an
-.\" otherwise unused console device (/dev/ttyN) that does not
-.\" have an associated getty process.
-On systems that follow System V semantics (e.g., Linux),
-this means that if the daemon opens a terminal that is not
-already a controlling terminal for another session,
-then that terminal will inadvertently become
-the controlling terminal for the daemon.
-.SH SEE ALSO
-.BR fork (2),
-.BR setsid (2),
-.BR daemon (7),
-.BR logrotate (8)