(mysql.info) mysql-ping

 
 22.2.3.49 `mysql_ping()'
 ........................
 
 `int mysql_ping(MYSQL *mysql)'
 
 *Description*
 
 Checks whether the connection to the server is working. If the
 connection has gone down, an automatic reconnection is attempted.
 
 This function can be used by clients that remain idle for a long while,
 to check whether the server has closed the connection and reconnect if
 necessary.
 
 *Return Values*
 
 Zero if the connection to the server is alive. Non-zero if an error
 occurred. A non-zero return does not indicate whether the MySQL server
 itself is down; the connection might be broken for other reasons such
 as network problems.
 
 *Errors*
 
    * `CR_COMMANDS_OUT_OF_SYNC'
 
      Commands were executed in an improper order.
 
    * `CR_SERVER_GONE_ERROR'
 
      The MySQL server has gone away.
 
    * `CR_UNKNOWN_ERROR'
 
      An unknown error occurred.

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