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NAME

       daemon - run in the background

SYNOPSIS

       #include <unistd.h>

       int daemon(int nochdir, int noclose);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       daemon(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)

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 nonzero, daemon()  changes  the  current
       working directory to the root ("/").

       Unless the argument noclose is nonzero, daemon() will redirect standard
       input, standard output and standard error to /dev/null.

RETURN VALUE

       (This function forks, and if the fork(2)  succeeds,  the  parent  calls
       _exit(2),  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 fork(2) and setsid(2).

CONFORMING TO

       Not in POSIX.1-2001.  A similar function  appears  on  the  BSDs.   The
       daemon() function first appeared in 4.4BSD.

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.

SEE ALSO

       fork(2), setsid(2)

COLOPHON

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