Added option hostname.err

sql/sql_parse.cc:
  added option hostname.err

sql/log.cc

@@ -1568,3 +1568,49 @@ void sql_perror(const char *message)
   perror(message);
 #endif
 }
+
+bool flush_error_log()
+{
+  bool result=0;
+  if (log_error_file[0] != '\0') /* --log-error="" */
+  {
+    char err_renamed[FN_REFLEN], *end;
+    end= strmake(err_renamed,log_error_file,FN_REFLEN-4);
+    strmov(end, "-old");
+#ifdef __WIN__
+    char err_temp[FN_REFLEN+4];
+    /*
+     On Windows is necessary a temporary file for to rename
+     the current error file.
+    */
+    strmov(strmov(err_temp, err_renamed),"-tmp");
+    (void) my_delete(err_temp, MYF(0)); 
+    if (freopen(err_temp,"a+",stdout))
+    {
+      freopen(err_temp,"a+",stderr);
+      (void) my_delete(err_renamed, MYF(0));
+      my_rename(log_error_file,err_renamed,MYF(0));
+      if (freopen(log_error_file,"a+",stdout))
+        freopen(log_error_file,"a+",stderr);
+      int fd, bytes;
+      char buf[IO_SIZE];
+      if ((fd = my_open(err_temp, O_RDONLY, MYF(0))) >= 0)
+      {
+        while ((bytes = (int) my_read(fd, (byte*) buf, IO_SIZE, MYF(0))) > 0)
+             my_fwrite(stderr, (byte*) buf, (uint) strlen(buf),MYF(0));
+        my_close(fd, MYF(0));
+      }
+      (void) my_delete(err_temp, MYF(0)); 
+    }
+    else
+     result= 1;
+#else
+   my_rename(log_error_file,err_renamed,MYF(0));
+   if (freopen(log_error_file,"a+",stdout))
+     freopen(log_error_file,"a+",stderr);
+   else
+     result= 1;
+#endif
+  }
+   return result;
+}

sql/mysql_priv.h

@@ -627,6 +627,7 @@ extern uchar *days_in_month;
 extern char language[LIBLEN],reg_ext[FN_EXTLEN];
 extern char glob_hostname[FN_REFLEN], mysql_home[FN_REFLEN];
 extern char pidfile_name[FN_REFLEN], time_zone[30], *opt_init_file;
+extern char log_error_file[FN_REFLEN];
 extern char blob_newline;
 extern double log_10[32];
 extern ulonglong keybuff_size;
@@ -813,6 +814,9 @@ extern int sql_cache_hit(THD *thd, char *inBuf, uint length);
 /* item.cc */
 Item *get_system_var(enum_var_type var_type, LEX_STRING name);
 
+/* log.cc */
+bool flush_error_log(void);
+
 /* Some inline functions for more speed */
 
 inline bool add_item_to_list(Item *item)

sql/mysqld.cc

@@ -262,6 +262,7 @@ my_bool opt_reckless_slave = 0;
 
 ulong back_log, connect_timeout, concurrency;
 char mysql_home[FN_REFLEN], pidfile_name[FN_REFLEN], time_zone[30];
+char log_error_file[FN_REFLEN];
 bool opt_log, opt_update_log, opt_bin_log, opt_slow_log;
 bool opt_disable_networking=0, opt_skip_show_db=0;
 my_bool opt_enable_named_pipe= 0;
@@ -278,6 +279,7 @@ static my_string opt_logname=0,opt_update_logname=0,
 
 static char* mysql_home_ptr= mysql_home;
 static char* pidfile_name_ptr= pidfile_name;
+char* log_error_file_ptr= log_error_file;
 static pthread_t select_thread;
 static my_bool opt_noacl=0, opt_bootstrap=0, opt_myisam_log=0;
 my_bool opt_safe_user_create = 0, opt_no_mix_types = 0;
@@ -2042,13 +2044,28 @@ int main(int argc, char **argv)
     open_log(&mysql_slow_log, glob_hostname, opt_slow_logname, "-slow.log",
 	     NullS, LOG_NORMAL);
 #ifdef __WIN__
-#define MYSQL_ERR_FILE "mysql.err"
   if (!opt_console)
   {
-    freopen(MYSQL_ERR_FILE,"a+",stdout);
-    freopen(MYSQL_ERR_FILE,"a+",stderr);
+#endif
+    if (log_error_file_ptr != log_error_file)
+      strmake(log_error_file, log_error_file_ptr, sizeof(log_error_file));
+    else
+    {
+      char *end;
+      uint length= ((end=strmake(log_error_file,
+                                 mysql_real_data_home,
+                                 FN_REFLEN-5)) -
+                      log_error_file);
+      *strxnmov(end, sizeof(log_error_file)-length-1,
+                glob_hostname, ".err", NullS)= '\0';
+    }
+    if (log_error_file[0] != '\0')
+      if (freopen(log_error_file, "a+", stdout))
+        freopen(log_error_file, "a+", stderr);
+#ifdef __WIN__
   }
 #endif
+
   if (ha_init())
   {
     sql_print_error("Can't init databases");
@@ -2964,7 +2981,8 @@ enum options {
   OPT_INNODB_FORCE_RECOVERY,
   OPT_BDB_CACHE_SIZE,
   OPT_BDB_LOG_BUFFER_SIZE,
-  OPT_BDB_MAX_LOCK
+  OPT_BDB_MAX_LOCK,
+  OPT_ERROR_LOG_FILE
 };
 
 
@@ -3253,6 +3271,9 @@ struct my_option my_long_options[] =
   {"pid-file", OPT_PID_FILE, "Pid file used by safe_mysqld",
    (gptr*) &pidfile_name_ptr, (gptr*) &pidfile_name_ptr, 0, GET_STR,
    REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
+  {"log-error", OPT_ERROR_LOG_FILE, "Log error file",
+   (gptr*) &log_error_file_ptr, (gptr*) &log_error_file_ptr, 0, GET_STR,
+   REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"port", 'P', "Port number to use for connection.", (gptr*) &mysql_port,
    (gptr*) &mysql_port, 0, GET_UINT, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"reckless-slave", OPT_RECKLESS_SLAVE, "For debugging", 0, 0, 0, GET_NO_ARG,

sql/set_var.cc

@@ -491,6 +491,7 @@ struct show_var_st init_vars[]= {
   {sys_net_write_timeout.name,(char*) &sys_net_write_timeout,       SHOW_SYS},
   {"open_files_limit",	      (char*) &open_files_limit,	    SHOW_LONG},
   {"pid_file",                (char*) pidfile_name,                 SHOW_CHAR},
+  {"log_error",               (char*) log_error_file,               SHOW_CHAR},
   {"port",                    (char*) &mysql_port,                  SHOW_INT},
   {"protocol_version",        (char*) &protocol_version,            SHOW_INT},
   {sys_read_buff_size.name,   (char*) &sys_read_buff_size,	    SHOW_SYS},

sql/sql_parse.cc

@@ -3407,6 +3407,8 @@ bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables)
     mysql_slow_log.new_file(1);
     if (ha_flush_logs())
       result=1;
+    if (flush_error_log())
+      result=1;
   }
 #ifdef HAVE_QUERY_CACHE
   if (options & REFRESH_QUERY_CACHE_FREE)