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DAEMON(3) Linux Programmer's Manual DAEMON(3) NAME
daemon - run in the background SYNOPSIS
#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 dae- mons. 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. BSD MANPAGE
1993-06-09 DAEMON(3)