DAEMONIZE(3)							  DAEMONIZE(3)

NAME    [Toc]    [Back]

     _daemonize	- make a process into a	daemon

SYNOPSIS    [Toc]    [Back]

     #include <unistd.h>

     int _daemonize(int	flags, int fd1,	int fd2, int fd3);

DESCRIPTION    [Toc]    [Back]

     The _daemonize function does the common work needed ``to put a function
     into the background,'' or to make it into a ``daemon.''  That generally
     includes forking a	new process, closing most files, and releasing the
     controlling tty.

     If	flags &	_DF_NOFORK is 0, then a	new process in a new session is
     started.  Debugging is often easier with flags set	to contain _DF_NOFORK.

     If	flags &	_DF_NOCHDIR is 0, then the current working directory is
     changed to	/.  Otherwise, the current working directory is	unchanged.

     If	flags &	_DF_NOCLOSE is 0, then all file	descriptors except fd1,	fd2,
     and fd3 are closed.  Because _daemonize closes all	file descriptors,
     closelog()	is called to stop logging cleanly.  The	fd# arguments should
     be	-1 if they are not file	descriptors to be left open.

SEE ALSO    [Toc]    [Back]

     close(2), chdir(2), fork(2), getdtablesize(2), syslog(3B),	setsid(2),
     tty(1), tty(7)

DIAGNOSTICS    [Toc]    [Back]

     The returned value	-1 indicates that one of the necessary system calls
     failed.


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