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DAEMON
Section: Linux Programmer's Manual (3)Updated: 1993-06-09
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NAME
daemon - run in the backgroundSYNOPSIS
#include <unistd.h>int daemon(int nochdir, int noclose);
DESCRIPTION
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.
RETURN VALUE
(This function forks, and if the fork() succeeds, the father 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).SEE ALSO
fork(2), setsid(2)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.HISTORY
The daemon() function first appeared in BSD4.4.