MySQL 5.6.14 Source Code Document
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wait_until_connected_again.inc
1 #
2 # Include this script to wait until the connection to the
3 # server has been restored or timeout occurs
4 --disable_result_log
5 --disable_query_log
6 let $counter= 500;
7 let $mysql_errno= 9999;
8 while ($mysql_errno)
9 {
10  # Strangely enough, the server might return "Too many connections"
11  # while being shutdown, thus 1040 is an "allowed" error
12  # See BUG#36228
13  --error 0,1040,1053,2002,2003,2006,2013
14  show status;
15 
16  dec $counter;
17  if (!$counter)
18  {
19  --die Server failed to restart
20  }
21  --sleep 0.1
22 }
23 --enable_query_log
24 --enable_result_log