summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorSamuel Mendoza-Jonas <sam@mendozajonas.com>2016-11-23 11:48:07 +1100
committerSamuel Mendoza-Jonas <sam@mendozajonas.com>2016-11-23 16:33:19 +1100
commit1dd51e986202e5e111c1042f148867bd08c2bedc (patch)
tree0ce589d83b05cf4db037fbd3d6fb5fca7c19cbe3
parente1e5d7f8169f36978a08078582c4cd1d2e71264e (diff)
downloadpetitboot-1dd51e986202e5e111c1042f148867bd08c2bedc.zip
petitboot-1dd51e986202e5e111c1042f148867bd08c2bedc.tar.gz
ui/ncurses: Spin child to ensure autoboot cancelled on exit
If the client is not connected to the server instance when exiting, fork and have the child process spin until the server is available and can be told to cancel autoboot. This prevents the scenario of a user exiting the UI and having the server continue to autoboot while they are using the command line. Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
-rw-r--r--ui/ncurses/nc-cui.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/ui/ncurses/nc-cui.c b/ui/ncurses/nc-cui.c
index c2f1c83..dfe8099 100644
--- a/ui/ncurses/nc-cui.c
+++ b/ui/ncurses/nc-cui.c
@@ -46,6 +46,8 @@
extern const struct help_text main_menu_help_text;
+static bool cui_detached = false;
+
static struct pmenu *main_menu_init(struct cui *cui);
static bool lockdown_active(void)
@@ -100,6 +102,9 @@ static void cui_start(void)
static void cui_atexit(void)
{
+ if (cui_detached)
+ return;
+
clear();
refresh();
endwin();
@@ -924,6 +929,31 @@ static struct discover_client_ops cui_client_ops = {
.update_config = cui_update_config,
};
+/* cui_server_wait_on_exit - On exit spin until the server is available.
+ *
+ * If the program exits before connecting to the server autoboot won't be
+ * cancelled even though there has been keyboard activity. This function is
+ * called by a child process which will spin until the server is connected and
+ * told to cancel autoboot.
+ *
+ * Processes exiting from this function will not carry out the cui_atexit()
+ * steps.
+ */
+static void cui_server_wait_on_exit(struct cui *cui)
+{
+ cui_detached = true;
+
+ while (!cui->client) {
+ cui->client = discover_client_init(cui->waitset,
+ &cui_client_ops, cui);
+ if (!cui->client)
+ sleep(1);
+ }
+
+ talloc_steal(cui, cui->client);
+ discover_client_cancel_default(cui->client);
+}
+
/* cui_server_wait - Connect to the discover server.
* @arg: Pointer to the cui instance.
*
@@ -1078,6 +1108,8 @@ fail_alloc:
int cui_run(struct cui *cui)
{
+ pid_t pid;
+
assert(main);
cui->current = &cui->main->scr;
@@ -1104,5 +1136,16 @@ int cui_run(struct cui *cui)
cui_atexit();
+ if (!cui->client) {
+ /* Fork a child to tell the server to cancel autoboot */
+ pid = fork();
+ if (!pid) {
+ cui_server_wait_on_exit(cui);
+ exit(EXIT_SUCCESS);
+ }
+ if (pid < 0)
+ pb_log("Failed to fork child on exit: %m\n");
+ }
+
return cui->abort ? 0 : -1;
}
OpenPOWER on IntegriCloud