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daemon(3) - daemon, daemon - run in the background - man 3 daemon

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DAEMON(3)                  Linux Programmer's Manual                 DAEMON(3)

       daemon - run in(1,8) the background

       #include <unistd.h>

       int daemon(int nochdir, int noclose);

       The daemon() function is for programs wishing to detach themselves from
       the controlling terminal and run in(1,8) 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 stan-
       dard input, standard output and standard error(8,n) to /dev/null.

       (This function forks, and if(3,n)  the  fork()  succeeds,  the  parent  does
       _exit(0),  so that further errors are seen by the child only.)  On suc-
       cess zero will be returned.  If an error(8,n) occurs,  daemon()  returns  -1
       and  sets  the global variable errno to any of the errors specified for
       the library functions fork(2) and setsid(2,8)(2).

       fork(2), setsid(2,8)(2)

       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.

       The daemon() function first appeared in(1,8) BSD4.4.

BSD MANPAGE                       1993-06-09                         DAEMON(3)

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