#### 18.2.3 closelog

The symbols referred to in this section are declared in the file `syslog.h`.

— Function: void closelog (void)

> Preliminary: | MT-Safe | AS-Unsafe lock | AC-Unsafe lock fd | See POSIX Safety Concepts.

> `closelog` closes the current Syslog connection, if there is one. This includes closing the `/dev/log` socket, if it is open. `closelog` also sets the identification string for Syslog messages back to the default, if `openlog` was called with a non-NULL argument to ident. The default identification string is the program name taken from argv[0].

> If you are writing shared library code that uses `openlog` to generate custom syslog output, you should use `closelog` to drop the GNU C Library's internal reference to the ident pointer when you are done. Please read the section on `openlog` for more information: See openlog.

> `closelog` does not flush any buffers. You do not have to call `closelog` before re-opening a Syslog connection with `openlog`. Syslog connections are automatically closed on exec or exit.