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(libc.info)closelog

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

 - Function: void closelog (void)
     `closelog' closes the current Syslog connection, if there is one.
     This include closing the `dev/log' socket, if it is open.

     There is very little reason to use this function.  It does not
     flush any buffers; you can reopen a Syslog connection without
     closing it first; The connection gets closed automatically on exec
     or exit.  `closelog' has primarily aesthetic value.