--- lbbs/src/screen.c	2025/05/19 06:55:06	1.65
+++ lbbs/src/screen.c	2025/05/25 06:55:23	1.69
@@ -241,7 +241,7 @@ int display_file_ex(const char *filename
 	long int percentile;
 	int loop;
 
-	if ((p_shm = get_file_shm(filename, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
+	if ((p_shm = get_file_shm_readonly(filename, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
 	{
 		log_error("get_file_shm(%s) error\n", filename);
 		return KEY_NULL;
@@ -293,7 +293,7 @@ int display_file_ex(const char *filename
 				input_ok = 1;
 				switch (ch)
 				{
-				// case KEY_NULL:
+				case KEY_NULL:
 				case KEY_TIMEOUT:
 					goto cleanup;
 				case KEY_HOME:
@@ -419,6 +419,11 @@ int display_file_ex(const char *filename
 	}
 
 cleanup:
+	if (detach_file_shm(p_shm) < 0)
+	{
+		log_error("detach_file_shm(%s) error\n", filename);
+	}
+
 	return ch;
 }
 
@@ -440,7 +445,7 @@ int show_top(const char *status)
 		status_f[len] = '\0';
 	}
 
-	len = split_line(BBS_current_section_name, 20, &truncate, &section_name_len);
+	len = split_line(BBS_current_section_name, BBS_section_name_max_len, &truncate, &section_name_len);
 	if (truncate)
 	{
 		log_error("Section name is truncated\n");
@@ -485,8 +490,8 @@ int show_bottom(const char *msg)
 	moveto(SCREEN_ROWS, 0);
 	clrtoeol();
 	prints("\033[1;44;33m[\033[36m%s\033[33m]%*s%*sÕʺÅ[\033[36m%s\033[33m]"
-		   "[\033[36m%1d\033[33m:\033[36m%2d\033[33m:\033[36m%2d\033[33m]\033[m",
-		   str_time, 21, msg_f, 13 - len_username, "", BBS_username,
+		   "[\033[36m%1d\033[33mÌì\033[36m%2d\033[33mʱ\033[36m%2d\033[33m·Ö]\033[m",
+		   str_time, 21, msg_f, 9 - len_username, "", BBS_username,
 		   tm_online->tm_mday - 1, tm_online->tm_hour, tm_online->tm_min);
 
 	return 0;
@@ -509,7 +514,7 @@ int show_active_board()
 
 	if (p_shm == NULL)
 	{
-		if ((p_shm = get_file_shm(DATA_ACTIVE_BOARD, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
+		if ((p_shm = get_file_shm_readonly(DATA_ACTIVE_BOARD, &data_len, &line_total, &p_data, &p_line_offsets)) == NULL)
 		{
 			log_error("get_file_shm(%s) error\n", DATA_ACTIVE_BOARD);
 			return KEY_NULL;