Cleanup of alarm macros.

Fixed data corruption bug in query cache.
Made queries be dependent of the database in use.

Docs/manual.texi

@@ -10200,7 +10200,7 @@ because it can't compile @code{.S} (assembler) files.
 The following configure line should work:
 
 @example
-CFLAGS="-DHPUX -I/opt/dce/include" CXXFLAGS="-DHPUX -I/opt/dce/include -felide-constructors -fno-exceptions -fno-rtti" CXX=gcc ./configure --with-pthread --with-named-thread-libs='-ldce' --prefix=/usr/local/mysql --disable-shared
+CFLAGS="-DHPUX -I/opt/dce/include -fpic" CXXFLAGS="-DHPUX -I/opt/dce/include -felide-constructors -fno-exceptions -fno-rtti" CXX=gcc ./configure --with-pthread --with-named-thread-libs='-ldce' --prefix=/usr/local/mysql --disable-shared
 @end example
 
 If you are compiling @code{gcc} 2.95 yourself, you should NOT link it with
@@ -22679,10 +22679,13 @@ file is written in the data directory.
 If you supply an extension to @code{--log-bin=filename.extension}, the
 extension will be silenty removed.
 
-To the binary log filename @code{mysqld} will append an extension that is a
-number that is incremented each time you execute @code{mysqladmin
-refresh}, execute @code{mysqladmin flush-logs}, execute the @code{FLUSH LOGS}
-statement or restart the server. 
+To the binary log filename @code{mysqld} will append an extension that
+is a number that is incremented each time you execute @code{mysqladmin
+refresh}, execute @code{mysqladmin flush-logs}, execute the @code{FLUSH
+LOGS} statement or restart the server. A new binary log will also
+automaticly be created when it reaches @code{max_bin_log_size}. You can
+delete all not active binary log files with the @code{RESET MASTER}
+command. @xref{RESET}.
 
 You can use the following options to @code{mysqld} to affect what is logged
 to the binary log:

client/mysql.cc

@@ -1717,7 +1717,6 @@ print_table_data_xml(MYSQL_RES *result)
     (void) tee_fputs("\n  <row>\n", PAGER);
     for (uint i=0; i < mysql_num_fields(result); i++)
     {
-      char *data;
       ulong *lengths=mysql_fetch_lengths(result);
       tee_fprintf(PAGER, "\t<%s>", (fields[i].name ?
 				  (fields[i].name[0] ? fields[i].name :

include/thr_alarm.h

@@ -38,24 +38,23 @@ extern "C" {
 #define THR_SERVER_ALARM SIGALRM
 #endif
 
-#if defined(DONT_USE_THR_ALARM)
+#if defined(DONT_USE_THR_ALARM) || !defined(THREAD)
 
 #define USE_ALARM_THREAD
 #undef USE_ONE_SIGNAL_HAND
 
-typedef struct st_thr_alarm_entry
-{
-  uint crono;
-} thr_alarm_entry;
+typedef my_bool thr_alarm_t;
+typedef my_bool ALARM;
 
-#define thr_alarm_init(A)   (A)->crono=0
-#define thr_alarm_in_use(A) (A)->crono
+#define thr_alarm_init(A) (*(A))=0
+#define thr_alarm_in_use(A) (*(A) != 0)
+#define thr_end_alarm(A)
+#define thr_alarm(A,B,C) ((*(A)=1)-1)
+/* The following should maybe be (*(A)) */
+#define thr_got_alarm(A) 0 
 #define init_thr_alarm(A)
 #define thr_alarm_kill(A)
 #define end_thr_alarm()
-#define thr_alarm(A,B) (((A)->crono=1)-1)
-#define thr_got_alarm(A) (A)->crono
-#define thr_end_alarm(A)
 
 #else
 #if defined(__WIN__)

libmysql/libmysql.c

@@ -2225,8 +2225,8 @@ send_file_to_server(MYSQL *mysql, const char *filename)
     my_net_write(&mysql->net,"",0);		/* Server needs one packet */
     net_flush(&mysql->net);
     mysql->net.last_errno=EE_FILENOTFOUND;
-    snprintf(mysql->net.last_error,sizeof(mysql->net.last_error)-1,
-	     EE(mysql->net.last_errno),tmp_name, errno);
+    my_snprintf(mysql->net.last_error,sizeof(mysql->net.last_error)-1,
+		EE(mysql->net.last_errno),tmp_name, errno);
     goto err;
   }
 
@@ -2250,8 +2250,8 @@ send_file_to_server(MYSQL *mysql, const char *filename)
   if (readcount < 0)
   {
     mysql->net.last_errno=EE_READ; /* the errmsg for not entire file read */
-    snprintf(mysql->net.last_error,sizeof(mysql->net.last_error)-1,
-	     tmp_name,errno);
+    my_snprintf(mysql->net.last_error,sizeof(mysql->net.last_error)-1,
+		tmp_name,errno);
     goto err;
   }
   result=0;					/* Ok */

libmysql/net.c

@@ -41,68 +41,55 @@
 #include <signal.h>
 #include <errno.h>
 
+/*
+  The following handles the differences when this is linked between the
+  client and the server.
+
+  This gives an error if a too big packet is found
+  The server can change this with the -O switch, but because the client
+  can't normally do this the client should have a bigger max_allowed_packet.
+*/
+
 #ifdef MYSQL_SERVER
 ulong max_allowed_packet=65536;
 extern ulong net_read_timeout,net_write_timeout;
 extern uint test_flags;
 #else
-
-/*
-** Give error if a too big packet is found
-** The server can change this with the -O switch, but because the client
-** can't normally do this the client should have a bigger max_allowed_packet.
-*/
-
-ulong max_allowed_packet=~0L;
+ulong max_allowed_packet=16*1024*1024L;
 ulong net_read_timeout=  NET_READ_TIMEOUT;
 ulong net_write_timeout= NET_WRITE_TIMEOUT;
 #endif
-ulong net_buffer_length=8192;	/* Default length. Enlarged if necessary */
 
-#if defined(__WIN__) || defined(MSDOS)
-#undef MYSQL_SERVER			/* Win32 can't handle interrupts */
+#ifdef __WIN__
+/* The following is because alarms doesn't work on windows. */
+#undef MYSQL_SERVER
 #endif
+
 #ifdef MYSQL_SERVER
 #include "my_pthread.h"
-#include "thr_alarm.h"
 void sql_print_error(const char *format,...);
 #define RETRY_COUNT mysqld_net_retry_count
 extern ulong mysqld_net_retry_count;
-#else
-
-#ifdef OS2				/* avoid name conflict */
-#define thr_alarm_t  thr_alarm_t_net
-#define ALARM        ALARM_net
-#endif
-
-typedef my_bool thr_alarm_t;
-typedef my_bool ALARM;
-#define thr_alarm_init(A) (*(A))=0
-#define thr_alarm_in_use(A) (*(A) != 0)
-#define thr_end_alarm(A)
-#define thr_alarm(A,B,C) local_thr_alarm((A),(B),(C))
-inline int local_thr_alarm(my_bool *A,int B __attribute__((unused)),ALARM *C __attribute__((unused)))
-{
-  *A=1;
-  return 0;
-}
-#define thr_got_alarm(A) 0
-#define RETRY_COUNT 1
-#endif
-
-#ifdef MYSQL_SERVER
 extern ulong bytes_sent, bytes_received;
 extern pthread_mutex_t LOCK_bytes_sent , LOCK_bytes_received;
+
 extern void query_cache_insert(NET *net, const char *packet, ulong length);
 #else
 #undef statistic_add
 #define statistic_add(A,B,C)
-#endif
+#define DONT_USE_THR_ALARM
+#define RETRY_COUNT 1
+#endif /* MYSQL_SERVER */
+
+#include "thr_alarm.h"
 
 #define TEST_BLOCKING		8
+#define MAX_THREE_BYTES 255L*255L*255L
+
+ulong net_buffer_length=8192;	/* Default length. Enlarged if necessary */
+
 static int net_write_buff(NET *net,const char *packet,ulong len);
 
-#define MAX_THREE_BYTES 255L*255L*255L
 
 	/* Init with packet info */
 
@@ -335,7 +322,7 @@ net_real_write(NET *net,const char *packet,ulong len)
   long int length;
   char *pos,*end;
   thr_alarm_t alarmed;
-#if !defined(__WIN__) && !defined(__EMX__) && !defined(OS2)
+#if defined(MYSQL_SERVER)
   ALARM alarm_buff;
 #endif
   uint retry_count=0;
@@ -522,7 +509,7 @@ my_real_read(NET *net, ulong *complen)
   uint i,retry_count=0;
   ulong len=packet_error;
   thr_alarm_t alarmed;
-#if (!defined(__WIN__) && !defined(__EMX__) && !defined(OS2)) || defined(MYSQL_SERVER)
+#if defined(MYSQL_SERVER)
   ALARM alarm_buff;
 #endif
   my_bool net_blocking=vio_is_blocking(net->vio);
@@ -775,7 +762,7 @@ my_net_read(NET *net)
 
 	  if (read_length != MAX_THREE_BYTES)	    /* last package */
 	  {
-	    multi_byte_packet= 0;		// No last zero length packet
+	    multi_byte_packet= 0;		/* No last zero len packet */
 	    break;
 	  }
 	  multi_byte_packet= NET_HEADER_SIZE;

mysql-test/t/rpl_get_lock.test

@@ -6,6 +6,8 @@ dirty_close master;
 connection master1;
 select get_lock("lock",2);
 select release_lock("lock");
+#ignore 
+disable_query_log;
 let $1=2000;
 while ($1)
 {
@@ -13,6 +15,7 @@ while ($1)
   do release_lock("lock");
   dec $1;
 }
+enable_query_log;
 save_master_pos;
 connection slave;
 sync_with_master;

mysys/my_bitmap.c

@@ -25,7 +25,7 @@
 #include "mysys_priv.h"
 #include <my_bitmap.h>
 #include <assert.h>
-#include <string.h>
+#include <m_string.h>
 
 inline void bitmap_lock(MY_BITMAP* map)
 {

sql/log_event.cc

@@ -1539,7 +1539,8 @@ int Query_log_event::exec_event(struct st_master_info* mi)
 {
   int expected_error,actual_error = 0;
   init_sql_alloc(&thd->mem_root, 8192,0);
-  thd->db = rewrite_db((char*)db);
+  thd->db= rewrite_db((char*)db);
+  thd->db_length=strlen(thd->db);
   if (db_ok(thd->db, replicate_do_db, replicate_ignore_db))
   {
     thd->query = (char*)query;
@@ -1584,14 +1585,16 @@ int Query_log_event::exec_event(struct st_master_info* mi)
     else
     {
       // master could be inconsistent, abort and tell DBA to check/fix it
-      thd->db = thd->query = 0;
+      thd->db= thd->query= 0;
+      thd->db_length=0;
       thd->convert_set = 0;
       close_thread_tables(thd);
       free_root(&thd->mem_root,0);
       return 1;
     }
   }
-  thd->db = 0;				// prevent db from being freed
+  thd->db= 0;					// prevent db from being freed
+  thd->db_length=0;
   thd->query = 0;				// just to be sure
   // assume no convert for next query unless set explictly
   thd->convert_set = 0;
@@ -1612,7 +1615,7 @@ int Query_log_event::exec_event(struct st_master_info* mi)
 int Load_log_event::exec_event(NET* net, struct st_master_info* mi)
 {
   init_sql_alloc(&thd->mem_root, 8192,0);
-  thd->db = rewrite_db((char*)db);
+  thd->db= rewrite_db((char*)db);
   thd->query = 0;
   thd->query_error = 0;
 
@@ -1685,7 +1688,8 @@ int Load_log_event::exec_event(NET* net, struct st_master_info* mi)
   }
 
   thd->net.vio = 0; 
-  thd->db = 0;// prevent db from being freed
+  thd->db= 0;// prevent db from being freed
+  thd->db_length=0;
   close_thread_tables(thd);
   if (thd->query_error)
   {

sql/mini_client.cc

@@ -22,21 +22,15 @@
  in case we decide to make them external at some point
  */
 
+#ifdef EMBEDDED_LIBRARY
+#define net_read_timeout net_read_timeout1
+#define net_write_timeout net_write_timeout1
+#endif
+
 #if defined(__WIN__)
 #include <winsock.h>
-#include <odbcinst.h>
-/* Disable alarms */
-typedef my_bool ALARM;
-#define thr_alarm_init(A) (*(A))=0
-#define thr_alarm_in_use(A) (*(A))
-#define thr_end_alarm(A)
-#define thr_alarm(A,B,C) local_thr_alarm((A),(B),(C))
-inline int local_thr_alarm(my_bool *A,int B __attribute__((unused)),ALARM *C __attribute__((unused)))
-{
-  *A=1;
-  return 0;
-}
-#define thr_got_alarm(A) 0
+#include <odbcinst.h>		/* QQ: Is this really needed ? */
+#define DONT_USE_THR_ALARM
 #endif
 
 #include <my_global.h>
@@ -53,12 +47,7 @@ inline int local_thr_alarm(my_bool *A,int B __attribute__((unused)),ALARM *C __a
 #include "mysqld_error.h"
 #include "errmsg.h"
 
-#ifdef EMBEDDED_LIBRARY
-#define net_read_timeout net_read_timeout1
-#define net_write_timeout net_write_timeout1
-#endif
-
-#if defined( OS2) && defined( MYSQL_SERVER)
+#if defined( OS2) && defined(MYSQL_SERVER)
 #undef  ER
 #define ER CER
 #endif
@@ -82,18 +71,17 @@ extern "C" {					// Because of SCO 3.2V4.2
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif
-#endif
+#endif /*!defined(MSDOS) && !defined(__WIN__) */
 #ifdef HAVE_SYS_UN_H
 #  include <sys/un.h>
 #endif
 #if defined(THREAD)
 #include <my_pthread.h>				/* because of signal()	*/
-#include <thr_alarm.h>
 #endif
+#include <thr_alarm.h>
 #ifndef INADDR_NONE
 #define INADDR_NONE	-1
 #endif
-
 }
 
 static void mc_free_rows(MYSQL_DATA *cur);
@@ -1073,8 +1061,8 @@ static int mc_send_file_to_server(MYSQL *mysql, const char *filename)
     my_net_write(&mysql->net,"",0);		// Server needs one packet
     net_flush(&mysql->net);
     mysql->net.last_errno=EE_FILENOTFOUND;
-    snprintf(mysql->net.last_error,sizeof(mysql->net.last_error)-1,
-	     EE(mysql->net.last_errno),tmp_name, errno);
+    my_snprintf(mysql->net.last_error,sizeof(mysql->net.last_error)-1,
+		EE(mysql->net.last_errno),tmp_name, errno);
     goto err;
   }
 
@@ -1098,8 +1086,8 @@ static int mc_send_file_to_server(MYSQL *mysql, const char *filename)
   if (readcount < 0)
   {
     mysql->net.last_errno=EE_READ; /* the errmsg for not entire file read */
-    snprintf(mysql->net.last_error,sizeof(mysql->net.last_error)-1,
-	     tmp_name,errno);
+    my_snprintf(mysql->net.last_error,sizeof(mysql->net.last_error)-1,
+		tmp_name,errno);
     goto err;
   }
   result=0;					// Ok

sql/net_serv.cc

@@ -41,68 +41,55 @@
 #include <signal.h>
 #include <errno.h>
 
+/*
+  The following handles the differences when this is linked between the
+  client and the server.
+
+  This gives an error if a too big packet is found
+  The server can change this with the -O switch, but because the client
+  can't normally do this the client should have a bigger max_allowed_packet.
+*/
+
 #ifdef MYSQL_SERVER
 ulong max_allowed_packet=65536;
 extern ulong net_read_timeout,net_write_timeout;
 extern uint test_flags;
 #else
-
-/*
-** Give error if a too big packet is found
-** The server can change this with the -O switch, but because the client
-** can't normally do this the client should have a bigger max_allowed_packet.
-*/
-
-ulong max_allowed_packet=~0L;
+ulong max_allowed_packet=16*1024*1024L;
 ulong net_read_timeout=  NET_READ_TIMEOUT;
 ulong net_write_timeout= NET_WRITE_TIMEOUT;
 #endif
-ulong net_buffer_length=8192;	/* Default length. Enlarged if necessary */
 
-#if defined(__WIN__) || defined(MSDOS)
-#undef MYSQL_SERVER			/* Win32 can't handle interrupts */
+#ifdef __WIN__
+/* The following is because alarms doesn't work on windows. */
+#undef MYSQL_SERVER
 #endif
+
 #ifdef MYSQL_SERVER
 #include "my_pthread.h"
-#include "thr_alarm.h"
 void sql_print_error(const char *format,...);
 #define RETRY_COUNT mysqld_net_retry_count
 extern ulong mysqld_net_retry_count;
-#else
-
-#ifdef OS2				/* avoid name conflict */
-#define thr_alarm_t  thr_alarm_t_net
-#define ALARM        ALARM_net
-#endif
-
-typedef my_bool thr_alarm_t;
-typedef my_bool ALARM;
-#define thr_alarm_init(A) (*(A))=0
-#define thr_alarm_in_use(A) (*(A) != 0)
-#define thr_end_alarm(A)
-#define thr_alarm(A,B,C) local_thr_alarm((A),(B),(C))
-inline int local_thr_alarm(my_bool *A,int B __attribute__((unused)),ALARM *C __attribute__((unused)))
-{
-  *A=1;
-  return 0;
-}
-#define thr_got_alarm(A) 0
-#define RETRY_COUNT 1
-#endif
-
-#ifdef MYSQL_SERVER
 extern ulong bytes_sent, bytes_received;
 extern pthread_mutex_t LOCK_bytes_sent , LOCK_bytes_received;
+
 extern void query_cache_insert(NET *net, const char *packet, ulong length);
 #else
 #undef statistic_add
 #define statistic_add(A,B,C)
-#endif
+#define DONT_USE_THR_ALARM
+#define RETRY_COUNT 1
+#endif /* MYSQL_SERVER */
+
+#include "thr_alarm.h"
 
 #define TEST_BLOCKING		8
+#define MAX_THREE_BYTES 255L*255L*255L
+
+ulong net_buffer_length=8192;	/* Default length. Enlarged if necessary */
+
 static int net_write_buff(NET *net,const char *packet,ulong len);
 
-#define MAX_THREE_BYTES 255L*255L*255L
 
 	/* Init with packet info */
 
@@ -335,7 +322,7 @@ net_real_write(NET *net,const char *packet,ulong len)
   long int length;
   char *pos,*end;
   thr_alarm_t alarmed;
-#if !defined(__WIN__) && !defined(__EMX__) && !defined(OS2)
+#if defined(MYSQL_SERVER)
   ALARM alarm_buff;
 #endif
   uint retry_count=0;
@@ -522,7 +509,7 @@ my_real_read(NET *net, ulong *complen)
   uint i,retry_count=0;
   ulong len=packet_error;
   thr_alarm_t alarmed;
-#if (!defined(__WIN__) && !defined(__EMX__) && !defined(OS2)) || defined(MYSQL_SERVER)
+#if defined(MYSQL_SERVER)
   ALARM alarm_buff;
 #endif
   my_bool net_blocking=vio_is_blocking(net->vio);
@@ -775,7 +762,7 @@ my_net_read(NET *net)
 
 	  if (read_length != MAX_THREE_BYTES)	    /* last package */
 	  {
-	    multi_byte_packet= 0;		// No last zero length packet
+	    multi_byte_packet= 0;		/* No last zero len packet */
 	    break;
 	  }
 	  multi_byte_packet= NET_HEADER_SIZE;

sql/sql_acl.cc

@@ -132,7 +132,8 @@ int  acl_init(bool dont_read_acl_tables)
   thd->mysys_var=my_thread_var;
   thd->current_tablenr=0;
   thd->open_tables=0;
-  thd->db=my_strdup("mysql",MYF(0));
+  thd->db= my_strdup("mysql",MYF(0));
+  thd->db_length=5;				// Safety
   bzero((char*) &tables,sizeof(tables));
   tables[0].name=tables[0].real_name=(char*) "host";
   tables[1].name=tables[1].real_name=(char*) "user";
@@ -2120,7 +2121,8 @@ int  grant_init (void)
   thd->mysys_var=my_thread_var;
   thd->current_tablenr=0;
   thd->open_tables=0;
-  thd->db=my_strdup("mysql",MYF(0));
+  thd->db= my_strdup("mysql",MYF(0));
+  thd->db_length=5;				// Safety
   bzero((char*) &tables,sizeof(tables));
   tables[0].name=tables[0].real_name= (char*) "tables_priv";
   tables[1].name=tables[1].real_name= (char*) "columns_priv";

sql/sql_cache.cc

@@ -752,8 +752,20 @@ void Query_cache::store_query(THD *thd, TABLE_LIST *tables_used)
 
     /* Check if another thread is processing the same query? */
     thd->query[thd->query_length] = (char) flags;
+    if (thd->db_length)
+    {
+      memcpy(thd->query+thd->query_length+1, thd->db, thd->db_length);
+      DBUG_PRINT("qcache", ("database : %s length %u",
+			    thd->db, thd->db_length)); 
+    }
+    else
+    {
+      DBUG_PRINT("qcache", ("No active database"));
+    }
+      
     Query_cache_block *competitor = (Query_cache_block *)
-      hash_search(&queries, (byte*) thd->query, thd->query_length+1);
+      hash_search(&queries, (byte*) thd->query,
+		  thd->query_length+1+thd->db_length);
     DBUG_PRINT("qcache", ("competitor 0x%lx, flags %x", (ulong) competitor,
 			flags));
     if (competitor == 0)
@@ -761,7 +773,7 @@ void Query_cache::store_query(THD *thd, TABLE_LIST *tables_used)
       /* Query is not in cache and no one is working with it; Store it */
       thd->query[thd->query_length] = (char) flags;
       Query_cache_block *query_block;
-      query_block= write_block_data(thd->query_length+1,
+      query_block= write_block_data(thd->query_length+1+thd->db_length,
 				    (gptr) thd->query,
 				    ALIGN_SIZE(sizeof(Query_cache_query)),
 				    Query_cache_block::QUERY, tables, 1);
@@ -894,10 +906,21 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length)
     flags |= (byte) thd->convert_set->number();
     DBUG_ASSERT(thd->convert_set->number() < 128);
   }
-
   sql[query_length] = (char) flags;
+  if (thd->db_length)
+  {
+    memcpy(sql+query_length+1, thd->db, thd->db_length);
+    DBUG_PRINT("qcache", ("database : %s length %u",
+			  thd->db, thd->db_length));
+  }
+  else
+  {
+    DBUG_PRINT("qcache", ("No active database"));
+  }
   query_block = (Query_cache_block *)  hash_search(&queries, (byte*) sql,
-						   query_length+1);
+						   query_length+1+
+						   thd->db_length);
+  
   sql[query_length] = '\0';
 
   /* Quick abort on unlocked data */
@@ -2450,10 +2473,21 @@ my_bool Query_cache::move_by_type(byte **border,
 
     Query_cache_block_table *nlist_root = new_block->table(0);
     nlist_root->n = 0;
-    nlist_root->next = (tnext == list_root ? nlist_root : tnext);
-    nlist_root->prev = (tprev == list_root ? nlist_root: tnext);
-    tnext->prev = nlist_root;
-    tprev->next = nlist_root;
+    if (tnext == list_root)
+    {
+      nlist_root->next = nlist_root;
+      nlist_root->prev = nlist_root;
+    }
+    else
+    {
+      nlist_root->next = tnext;
+      tnext->prev = nlist_root;
+    }
+    if (tprev != list_root)
+    {
+      nlist_root->prev = tnext;
+      tprev->next = nlist_root;
+    }
     for (;tnext != nlist_root; tnext=tnext->next)
       tnext->parent = new_block->table();
     *border += len;
@@ -2592,10 +2626,21 @@ void Query_cache::relink(Query_cache_block *oblock,
 			 Query_cache_block *next, Query_cache_block *prev,
 			 Query_cache_block *pnext, Query_cache_block *pprev)
 {
-  nblock->prev = (prev == oblock ? nblock : prev); //check pointer to himself
-  nblock->next = (next == oblock ? nblock : next);
-  prev->next=nblock;
-  next->prev=nblock;
+  if (prev == oblock) //check pointer to himself
+  {
+    nblock->prev = nblock;
+    nblock->next = nblock;
+  }
+  else
+  {
+    nblock->prev = prev;
+    prev->next=nblock;
+  }
+  if (next != oblock)
+  {
+    nblock->next = next;
+    next->prev=nblock;
+  }
   nblock->pprev = pprev; // Physical pointer to himself have only 1 free block
   nblock->pnext = pnext;
   pprev->pnext=nblock;

sql/sql_class.cc

@@ -85,7 +85,7 @@ THD::THD():user_time(0),fatal_error(0),last_insert_id_used(0),
   host_or_ip="unknown ip";
   locked=killed=count_cuted_fields=some_tables_deleted=no_errors=password=
     query_start_used=safe_to_cache_query=0;
-  query_length=col_access=0;
+  db_length=query_length=col_access=0;
   query_error=0;
   next_insert_id=last_insert_id=0;
   open_tables=temporary_tables=handler_tables=0;

sql/sql_class.h

@@ -288,6 +288,7 @@ public:
   uint	     current_tablenr,tmp_table,cond_count,col_access;
   uint	     server_status,open_options;
   uint32     query_length;
+  uint32     db_length;
   enum_tx_isolation tx_isolation, session_tx_isolation;
   char	     scramble[9];
   uint8	     query_cache_type;		// type of query cache processing
@@ -400,6 +401,13 @@ public:
   { return strmake_root(&mem_root,str,size); }
   inline char *memdup(const char *str, uint size)
   { return memdup_root(&mem_root,str,size); }
+  inline char *memdup_w_gap(const char *str, uint size, uint gap)
+  {
+    gptr ptr;
+    if ((ptr=alloc_root(&mem_root,size+gap)))
+      memcpy(ptr,str,size);
+    return ptr;
+  }
 };
 
 

sql/sql_db.cc

@@ -317,19 +317,19 @@ static long mysql_rm_known_files(THD *thd, MY_DIR *dirp, const char *db,
 
 bool mysql_change_db(THD *thd,const char *name)
 {
-  int length;
+  int length, db_length;
   char *dbname=my_strdup((char*) name,MYF(MY_WME));
   char	path[FN_REFLEN];
   uint db_access;
   DBUG_ENTER("mysql_change_db");
 
-  if (!dbname || !(length=stripp_sp(dbname)))
+  if (!dbname || !(db_length=stripp_sp(dbname)))
   {
     x_free(dbname);				/* purecov: inspected */
     send_error(&thd->net,ER_NO_DB_ERROR);	/* purecov: inspected */
     DBUG_RETURN(1);				/* purecov: inspected */
   }
-  if ((length > NAME_LEN) || check_db_name(dbname))
+  if ((db_length > NAME_LEN) || check_db_name(dbname))
   {
     net_printf(&thd->net,ER_WRONG_DB_NAME, dbname);
     x_free(dbname);
@@ -369,6 +369,7 @@ bool mysql_change_db(THD *thd,const char *name)
   send_ok(&thd->net);
   x_free(thd->db);
   thd->db=dbname;
+  thd->db_length=db_length;
   thd->db_access=db_access;
   DBUG_RETURN(0);
 }

sql/sql_parse.cc

@@ -127,6 +127,7 @@ static bool check_user(THD *thd,enum_server_command command, const char *user,
 {
   NET *net= &thd->net;
   thd->db=0;
+  thd->db_length=0;
 
   if (!(thd->user = my_strdup(user, MYF(0))))
   {
@@ -632,7 +633,8 @@ pthread_handler_decl(handle_bootstrap,arg)
     buff[length]=0;
     thd->current_tablenr=0;
     thd->query_length=length;
-    thd->query= thd->memdup(buff,length+1);
+    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
+    thd->query[length] = '\0';
     thd->query_id=query_id++;
     mysql_parse(thd,thd->query,length);
     close_thread_tables(thd);			// Free tables
@@ -807,6 +809,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
     /* Save user and privileges */
     uint save_master_access=thd->master_access;
     uint save_db_access=    thd->db_access;
+    uint save_db_length=    thd->db_length;
     char *save_user=	    thd->user;
     char *save_priv_user=   thd->priv_user;
     char *save_db=	    thd->db;
@@ -823,6 +826,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       thd->master_access=save_master_access;
       thd->db_access=save_db_access;
       thd->db=save_db;
+      thd->db_length=save_db_length;
       thd->user=save_user;
       thd->priv_user=save_priv_user;
       break;
@@ -844,7 +848,9 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
       packet_length--;
     }
     thd->query_length= packet_length;
-    if (!(thd->query= (char*) thd->memdup((gptr) (packet),packet_length+1)))
+    if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
+						packet_length+1,
+						thd->db_length+1)))
       break;
     thd->query[packet_length]=0;
     thd->packet.shrink(net_buffer_length);	// Reclaim some memory
@@ -876,6 +882,7 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
     thd->free_list=0;
     table_list.name=table_list.real_name=thd->strdup(packet);
     packet=strend(packet)+1;
+    // command not cachable => no gap for data base name
     if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
       break;
     mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
@@ -1117,7 +1124,7 @@ mysql_execute_command(void)
     if (lex->sql_command == SQLCOM_SELECT)
     {
       lex->sql_command = SQLCOM_DO;
-      lex->insert_list = &lex->item_list;
+      lex->insert_list = &select_lex->item_list;
     }
 #endif
   }

sql/sql_udf.cc

@@ -139,7 +139,8 @@ void udf_init()
   new_thd->version = refresh_version;	//current_thd->version;
   new_thd->current_tablenr = 0;
   new_thd->open_tables = 0;
-  new_thd->db = my_strdup("mysql", MYF(0));
+  new_thd->db= my_strdup("mysql", MYF(0));
+  new_thd->db_length=5;
 
   bzero((gptr) &tables,sizeof(tables));
   tables.name = tables.real_name = (char*) "func";