From: Bjorn Munch
Date: July 10 2012 10:05am
Subject: bzr push into mysql-5.1 branch (bjorn.munch:3769 to 3770)
List-Archive: http://lists.mysql.com/commits/144416
Message-Id: <20120710100540.21923.85116.3770@khepri15.no.oracle.com>
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 3770 Bjorn Munch	2012-07-10
      mysql_client_fw.c was not included in make dist

    modified:
      tests/Makefile.am
 3769 Sujatha Sivakumar	2012-07-10
      BUG#11762670:MY_B_WRITE RETURN VALUE IGNORED
      
      Problem:
      =======
      The return value from my_b_write is ignored by: `my_b_write_quoted',
      `my_b_write_bit',`Query_log_event::print_query_header'
      
      Most callers of `my_b_printf' ignore the return value. `log_event.cc' 
      has many calls to it. 
      
      Analysis:
      ========
      `my_b_write' is used to write data into a file. If the write fails it
      sets appropriate error number and error message through my_error()
      function call and sets the IO_CACHE::error == -1.
      `my_b_printf' function is also used to write data into a file, it
      internally invokes my_b_write to do the write operation. Upon
      success it returns number of characters written to file and on error
      it returns -1 and sets the error through my_error() and also sets
      IO_CACHE::error == -1.  Most of the event specific print functions
      for example `Create_file_log_event::print', `Execute_load_log_event::print'
      etc are the ones which make several calls to the above two functions and
      they do not check for the return value after the 'print' call. All the above 
      mentioned abuse cases deal with the client side.
      
      Fix:
      ===
      As part of bug fix a check for IO_CACHE::error == -1 has been added at 
      a very high level after the call to the 'print' function.  There are 
      few more places where the return value of "my_b_write" is ignored
      those are mentioned below.
      
      +++ mysys/mf_iocache2.c    2012-06-04 07:03:15 +0000
      @@ -430,7 +430,8 @@
                 memset(buffz, '0', minimum_width - length2);
               else
                 memset(buffz, ' ', minimum_width - length2);
      -        my_b_write(info, buffz, minimum_width - length2);
      
      +++ sql/log.cc	2012-06-08 09:04:46 +0000
      @@ -2388,7 +2388,12 @@
           {
             end= strxmov(buff, "# administrator command: ", NullS);
             buff_len= (ulong) (end - buff);
      -      my_b_write(&log_file, (uchar*) buff, buff_len);
      
      At these places appropriate return value handlers have been added.
     @ client/mysqlbinlog.cc
        check for IO_CACHE::error == -1 has been added after the call to
        the event specific print functions
     @ internal/mysql-test/suite/i_binlog/r/binlog_mysqlbinlog_file_write.result
        Result file has been updated with test results for BUG#11762670
     @ internal/mysql-test/suite/i_binlog/t/binlog_mysqlbinlog_file_write.test
        Added test cases for testing the fix for BUG11762670.
     @ internal/mysql-test/suite/i_main/r/slow_log_write_errchk.result
        Result file for test `slow_log_write_errchk.test'.
     @ internal/mysql-test/suite/i_main/t/slow_log_write_errchk-master.opt
        Option file includes two options, one to enable 'admin commands' to be logged
        in slow log file. The other option specifies the name for slow log file.
     @ internal/mysql-test/suite/i_main/t/slow_log_write_errchk.test
        Test script to test error handling when a write operation to the slow log file
        fails.
     @ mysys/mf_iocache2.c
        Added handler to check the written value of `my_b_write'
     @ sql/log.cc
        Added handler to check the written value of `my_b_write'
     @ sql/log_event.cc
        Added error simulation statements in `Create_file_log_event::print`
        and `Execute_load_query_log_event::print'
     @ sql/rpl_utility.h
        Removed the extra ';'

    added:
      internal/mysql-test/suite/i_main/r/slow_log_write_errchk.result
      internal/mysql-test/suite/i_main/t/slow_log_write_errchk-master.opt
      internal/mysql-test/suite/i_main/t/slow_log_write_errchk.test
    modified:
      client/mysqlbinlog.cc
      internal/mysql-test/suite/i_binlog/r/binlog_mysqlbinlog_file_write.result
      internal/mysql-test/suite/i_binlog/t/binlog_mysqlbinlog_file_write.test
      mysys/mf_iocache2.c
      sql/log.cc
      sql/log_event.cc
      sql/rpl_utility.h
=== modified file 'tests/Makefile.am'
--- a/tests/Makefile.am	2012-07-09 13:10:07 +0000
+++ b/tests/Makefile.am	2012-07-10 09:57:24 +0000
@@ -33,6 +33,7 @@ EXTRA_DIST =		auto_increment.res auto_in
 			grant.pl grant.res test_delayed_insert.pl \
 			pmail.pl mail_to_db.pl table_types.pl \
 			myisam-big-rows.tst \
+			mysql_client_fw.c \
 			CMakeLists.txt
 
 bin_PROGRAMS =		mysql_client_test

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