Originální popis anglicky:
daemon - run in the background
Návod, kniha: Linux Programmer's Manual
#include <unistd.h>
int daemon(int nochdir, int noclose);
The
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,
daemon() changes the
current working directory to the root ("/").
Unless the argument
noclose is non-zero,
daemon() will redirect
standard input, standard output and standard error to
/dev/null.
(This function forks, and if the
fork() succeeds, the parent does
_exit(0), so that further errors are seen by the child only.) On
success zero will be returned. If an error occurs,
daemon() returns -1
and sets the global variable
errno to any of the errors specified for
the library functions
fork(2) and
setsid(2).
fork(2),
setsid(2)
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.
The
daemon() function first appeared in BSD4.4.
