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DAEMON
Section: Linux Programmer's Manual (3)
Updated: 2009-12-05
Index
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NAME
daemon - run in the background
SYNOPSIS
#include <unistd.h>
int daemon(int nochdir, int noclose);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
daemon():
_BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
DESCRIPTION
The
daemon()
function is for programs wishing to detach themselves from the
controlling terminal and run in the background as system daemons.
If
nochdir
is zero,
daemon()
changes the calling process's current working directory
to the root directory ("/");
otherwise, the current working directory is left unchanged.
If
noclose
is zero,
daemon()
redirects standard input, standard output and standard error
to /dev/null;
otherwise, no changes are made to these file descriptors.
RETURN VALUE
(This function forks, and if the
fork(2)
succeeds, the parent calls
_exit(2),
so that further errors are seen by the child only.)
On success
daemon()
returns zero.
If an error occurs,
daemon()
returns -1 and sets
errno
to any of the errors specified for the
fork(2)
and
setsid(2).
CONFORMING TO
Not in POSIX.1-2001.
A similar function appears on the BSDs.
The
daemon()
function first appeared in 4.4BSD.
NOTES
The glibc implementation can also return -1 when
/dev/null
exists but is not a character device with the expected
major and minor numbers.
In this case
errno
need not be set.
SEE ALSO
fork(2),
setsid(2)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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