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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 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(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  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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