many warnings (practically safe but annoying) corrected

client/mysqladmin.cc:
  don't use the handler after it's closed
client/mysqlbinlog.cc:
  memory leak
client/mysqldump.c:
  many "ignore return value" warnings, one "NULL dereference"
cmd-line-utils/libedit/history.c:
  memory leak
include/my_base.h:
  cleanup
libmysql/libmysql.c:
  "return value ignored" warning
myisam/mi_delete.c:
  "return value ignored" warning
myisam/myisampack.c:
  "out-of-bound access" warning
myisam/sort.c:
  "double free" warning
mysys/default_modify.c:
  "double free" warning
mysys/mf_iocache2.c:
  "return value ignored" warnings
mysys/my_bitmap.c:
  s/return/DBUG_RETURN/
mysys/my_error.c:
  memory leak
server-tools/instance-manager/parse.cc:
  "NULL dereference" warning
sql-common/client.c:
  "NULL dereference" warning
sql/field.cc:
  deadcode, "NULL dereference", "uninitialized" warnings
sql/field.h:
  unused parameters removed from constructor
sql/ha_myisam.cc:
  "return value ignored" warnings
sql/item.cc:
  "return value ignored" warnings
  changed constructor
sql/item_func.cc:
  "return value ignored" warnings
sql/log_event.cc:
  uninitialized warning
sql/opt_range.cc:
  "double free" and uninitialized warnings
sql/opt_range.h:
  "return value ignored" warning
sql/repl_failsafe.cc:
  "return value ignored" warning
sql/set_var.cc:
  "return value ignored" warning
sql/slave.cc:
  "return value ignored" warnings
sql/slave.h:
  new prototype
sql/sql_acl.cc:
  deadcode and "NULL dereference" warnings
sql/sql_db.cc:
  "return value ignored" warning
sql/sql_handler.cc:
  "NULL dereference" warning
sql/sql_help.cc:
  "NULL dereference" warning
sql/sql_insert.cc:
  "return value ignored" warning
sql/sql_parse.cc:
  "return value ignored" warning
  one more DBUG_ASSERT
sql/sql_repl.cc:
  "return value ignored" and memory leak warnings
sql/sql_show.cc:
  "return value ignored" and "NULL dereference"  warnings
sql/sql_test.cc:
  "return value ignored" warning
sql/table.cc:
  memory leak
sql/uniques.cc:
  "return value ignored" warning
  endspaces deleted

1 files changed, 24 insertions, 14 deletions

diff --git a/sql/slave.cc b/sql/slave.cc
index 5e1c838730c..3795cbaf7c0 100644
--- a/sql/slave.cc
+++ b/sql/slave.cc
@@ -2017,7 +2017,8 @@ static void write_ignored_events_info_to_relay_log(THD *thd, MASTER_INFO *mi)
                         " to the relay log, "
                         "SHOW SLAVE STATUS may be inaccurate");
       rli->relay_log.harvest_bytes_written(&rli->log_space_total);
-      flush_master_info(mi, 1);
+      if (flush_master_info(mi, 1))
+        sql_print_error("Failed to flush master info file");
       delete ev;
     }
     else
@@ -2555,7 +2556,7 @@ bool show_master_info(THD* thd, MASTER_INFO* mi)
 
     pthread_mutex_unlock(&mi->rli.data_lock);
     pthread_mutex_unlock(&mi->data_lock);
-  
+
     if (my_net_write(&thd->net, (char*)thd->packet.ptr(), packet->length()))
       DBUG_RETURN(TRUE);
   }
@@ -2563,8 +2564,13 @@ bool show_master_info(THD* thd, MASTER_INFO* mi)
   DBUG_RETURN(FALSE);
 }
 
-
-bool flush_master_info(MASTER_INFO* mi, bool flush_relay_log_cache)
+/*
+  RETURN
+     2 - flush relay log failed
+     1 - flush master info failed
+     0 - all ok
+*/
+int flush_master_info(MASTER_INFO* mi, bool flush_relay_log_cache)
 {
   IO_CACHE* file = &mi->file;
   char lbuf[22];
@@ -2583,8 +2589,9 @@ bool flush_master_info(MASTER_INFO* mi, bool flush_relay_log_cache)
     When we come to this place in code, relay log may or not be initialized;
     the caller is responsible for setting 'flush_relay_log_cache' accordingly.
   */
-  if (flush_relay_log_cache)
-    flush_io_cache(mi->rli.relay_log.get_log_file());
+  if (flush_relay_log_cache &&
+      flush_io_cache(mi->rli.relay_log.get_log_file()))
+    DBUG_RETURN(2);
 
   /*
     We flushed the relay log BEFORE the master.info file, because if we crash
@@ -2596,13 +2603,13 @@ bool flush_master_info(MASTER_INFO* mi, bool flush_relay_log_cache)
   */
 
   /*
-     In certain cases this code may create master.info files that seems 
-     corrupted, because of extra lines filled with garbage in the end 
-     file (this happens if new contents take less space than previous 
-     contents of file). But because of number of lines in the first line 
+     In certain cases this code may create master.info files that seems
+     corrupted, because of extra lines filled with garbage in the end
+     file (this happens if new contents take less space than previous
+     contents of file). But because of number of lines in the first line
      of file we don't care about this garbage.
   */
-  
+
   my_b_seek(file, 0L);
   my_b_printf(file, "%u\n%s\n%s\n%s\n%s\n%s\n%d\n%d\n%d\n%s\n%s\n%s\n%s\n%s\n",
 	      LINES_IN_MASTER_INFO_WITH_SSL,
@@ -2611,8 +2618,7 @@ bool flush_master_info(MASTER_INFO* mi, bool flush_relay_log_cache)
 	      mi->password, mi->port, mi->connect_retry,
               (int)(mi->ssl), mi->ssl_ca, mi->ssl_capath, mi->ssl_cert,
               mi->ssl_cipher, mi->ssl_key);
-  flush_io_cache(file);
-  DBUG_RETURN(0);
+  DBUG_RETURN(-flush_io_cache(file));
 }
 
 
@@ -3644,7 +3650,11 @@ reconnect done to recover from failed read");
 	sql_print_error("Slave I/O thread could not queue event from master");
 	goto err;
       }
-      flush_master_info(mi, 1); /* sure that we can flush the relay log */
+      if (flush_master_info(mi, 1))
+      {
+        sql_print_error("Failed to flush master info file");
+        goto err;
+      }
       /*
         See if the relay logs take too much space.
         We don't lock mi->rli.log_space_lock here; this dirty read saves time