daemon - run in the background
#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.
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 daemon() function first appeared in BSD4.4.
BSD MANPAGE 1993-06-09 DAEMON(3)
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