daemon

Function helps programs wishing to detach themselves from the controlling terminal and run in the background as system daemons.

This function forks and if the fork(2) succeeds, the parent calls "exit 0", so that further errors are seen by the child only.

On success daemon() returns 0 or 1 if an error occurred.

Variables:

daemon_noclose - do not close first 3-9 descriptors;

daemon_nokill - do not check previous pid;

daemon_nolock - do not lock the pid file;

daemon_err_file - specifies error log file (default /dev/null);

daemon_log_file - specifies log file (default /dev/null);

daemon_pid_file - specifies pid file.

daemon_close_fd

Function closes all open descriptors or the selected one.

daemon_write_pid

Function checks the PID from a pidfile and writes a new one.