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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.

       If nochdir is zero, daemon()  changes  the  calling  process's  current
       working  directory  to the root directory ("/"); otherwise, the current
       working directory is left unchanged.

       If noclose is zero, daemon() redirects standard input, standard  output
       and  standard  error  to  /dev/null;  otherwise, no changes are made to
       these file descriptors.

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 daemon() returns zero.  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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