refine log

@@ -78,7 +78,7 @@ start() {
     fi
     
     # check again after start server
-    sleep 0.5
+    sleep 1
     for ((i = 0; i < 5; i++)); do
         # sleep a little while, for srs may start then crash.
         sleep 0.1

@@ -243,9 +243,8 @@ void SrsFastLog::write_log(char *str_log, int size, int _level)
         printf("\033[31m%s\033[0m", str_log);
     }
 
-    // if specified log file, write log to it.
-    if (!_srs_config->get_srs_log_file().empty()) {
-        if (fd < 0) {
+    // open log file.
+    if (!_srs_config->get_srs_log_file().empty() && fd < 0) {
         std::string filename = _srs_config->get_srs_log_file();
         
         fd = ::open(filename.c_str(), O_RDWR | O_APPEND);
@@ -257,9 +256,8 @@ void SrsFastLog::write_log(char *str_log, int size, int _level)
             );
         }
     }
-
+    // write log to file.
     if (fd > 0) {
         ::write(fd, str_log, size);
     }
-    }
 }