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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  process’s  current  working
       directory to the root directory ("/"); otherwise,

       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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