add function log_reopen_ex

HISTORY

@@ -1,5 +1,5 @@
 
-Version 1.06  2014-08-25
+Version 1.06  2014-08-26
   * update source code from FastDFS V5.02
   * add function short2buff and buff2short
   * add object memory pool (fast_mblock.h and fast_mblock.c)
@@ -23,6 +23,7 @@ Version 1.06  2014-08-25
   * socket send and recv ignore erno EINTR
   * http_parse_query_ex support binary buffer, and set both lengths of key and name
   * add function ioevent_remove
+  * add function log_reopen_ex
 
 Version 1.05  2012-07-08
   * update source code from FastDFS V3.09

src/logger.c

@@ -147,6 +147,20 @@ static int log_open(LogContext *pContext)
 	return 0;
 }
 
+int log_reopen_ex(LogContext *pContext)
+{
+	if (*(pContext->log_filename) == '\0')
+	{
+		return ENOENT;
+	}
+
+    if (pContext->log_fd >= 0 && pContext->log_fd != STDERR_FILENO)
+    {
+        close(pContext->log_fd);
+    }
+    return log_open(pContext);
+}
+
 int log_set_prefix_ex(LogContext *pContext, const char *base_path, \
 		const char *filename_prefix)
 {

src/logger.h

@@ -99,6 +99,8 @@ int log_init();
 */
 int log_init2();
 
+#define log_reopen() log_reopen_ex(&g_log_context)
+
 #define log_set_prefix(base_path, filename_prefix) \
 	log_set_prefix_ex(&g_log_context, base_path, filename_prefix)
 
@@ -119,6 +121,13 @@ int log_init2();
 */
 int log_init_ex(LogContext *pContext);
 
+/** reopen the log file
+ *  parameters:
+ *           pContext: the log context
+ *  return: 0 for success, != 0 fail
+*/
+int log_reopen_ex(LogContext *pContext);
+
 /** set log filename prefix, such as "tracker", the log filename will be 
  *  ${base_path}/logs/tracker.log
  *  parameters: