daemon - run in the background
Standard C Library (libc, -lc)
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.
On return 0 indicates success with -1 indicating error.
The function daemon() may fail and set errno for any of the errors specified
for the library functions fork(2) and setsid(2).
The daemon() function first appeared in 4.4BSD.
daemon() uses fork() as part of its tty detachment mechanism. Consequently
the process id changes when daemon() is invoked. Processes
employing daemon() can not be reliably waited upon until daemon() has
BSD September 3, 1999 BSD
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