NAME
daemon - run in the background
SYNOPSIS
#include <unistd.h>
I int daemon(int nochdir , int noclose );
DESCRIPTION
The
R daemon ()
function is for programs wishing to detach themselves from the
controlling terminal and run in the background as system daemons.
Unless the argument
nochdir
is non-zero,
R daemon ()
changes the current working directory to the root ("/").
Unless the argument
noclose
is non-zero,
R daemon ()
will redirect standard input, standard output and standard error
to /dev/null.
RETURN VALUE
(This function forks, and if the
fork(2)
succeeds, the parent calls
R _exit (2),
so that further errors are seen by the child only.)
On success zero will be returned.
If an error occurs,
R daemon ()
returns -1 and sets the global variable
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
R 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
ČLÁNKY DO MAILU