app/testpmd: avoid exit without terminal restore

[ upstream commit b3e3d60 ]

In interactive mode, if testpmd exit by calling rte_exit without
restore terminal attributes, terminal will not echo keyboard input.

register a function with atexit() in prompt(), when exit() in
rte_exit() is called, the registered function restores terminal
attributes.

Fixes: 5a8fb55 ("app/testpmd: support unidirectional configuration")

Signed-off-by: Dapeng Yu <dapengx.yu@intel.com>
Acked-by: Xiaoyun Li <xiaoyun.li@intel.com>

app/test-pmd/cmdline.c

@@ -17114,22 +17114,31 @@ cmdline_read_from_file(const char *filename)
 void
 prompt(void)
 {
+	int ret;
 	/* initialize non-constant commands */
 	cmd_set_fwd_mode_init();
 	cmd_set_fwd_retry_mode_init();
 
 	testpmd_cl = cmdline_stdin_new(main_ctx, "testpmd> ");
 	if (testpmd_cl == NULL)
 		return;
+
+	ret = atexit(prompt_exit);
+	if (ret != 0)
+		printf("Cannot set exit function for cmdline\n");
+
 	cmdline_interact(testpmd_cl);
-	cmdline_stdin_exit(testpmd_cl);
+	if (ret != 0)
+		cmdline_stdin_exit(testpmd_cl);
 }
 
 void
 prompt_exit(void)
 {
-	if (testpmd_cl != NULL)
+	if (testpmd_cl != NULL) {
 		cmdline_quit(testpmd_cl);
+		cmdline_stdin_exit(testpmd_cl);
+	}
 }
 
 static void