all repos — tint2 @ 0d0b1249c74124826a8cc4c3542eb9a96c383b4c

fork of the tint2 desktop panel for my custom setup - only minimized windows across all desktops for the taskbar 

Battery: Handle Linux kernel events

The Kernel sends notifications for AC (un)plug and some
other important power supply events, so that we can
instantly update the widget. Apart from that it sends
notifications for any added or removed power supplies,
so that the battery support can be reinitialized (useful
on systems with removable batteries).
Sebastian Reichel sre@ring0.de
commit

0d0b1249c74124826a8cc4c3542eb9a96c383b4c

parent

46a6d2c2ad239c0256b7df6b0529180c13707afc

2 files changed, 30 insertions(+), 0 deletions(-)

jump to
M src/battery/battery.h → src/battery/battery.h 
@@ -94,6 +94,7 @@ 
 // freed memory
 void cleanup_battery();
 
+void update_battery_tick(void* arg);
 int update_battery();
 
 void init_battery();
M src/battery/linux.c → src/battery/linux.c 
@@ -23,6 +23,7 @@ #include <stdlib.h>
 
 #include "common.h"
 #include "battery.h"
+#include "uevent.h"
 
 enum psy_type {
 	PSY_UNKNOWN,

@@ -59,6 +60,28 @@ /* values */
 	gboolean             online;
 };
 
+static void uevent_battery_update() {
+	update_battery_tick(NULL);
+}
+static struct uevent_notify psy_change = {
+	UEVENT_CHANGE,
+	"power_supply",
+	NULL,
+	uevent_battery_update
+};
+
+static void uevent_battery_plug() {
+	printf("reinitialize batteries after HW change\n");
+	cleanup_battery();
+	init_battery();
+}
+static struct uevent_notify psy_plug = {
+	UEVENT_ADD | UEVENT_REMOVE,
+	"power_supply",
+	NULL,
+	uevent_battery_plug
+};
+
 #define RETURN_ON_ERROR(err) if(error) { g_error_free(err); return FALSE; }
 
 static GList *batteries = NULL;

@@ -173,6 +196,9 @@ 
 void battery_os_free() {
 	GList *l = batteries;
 
+	uevent_unregister_notifier(&psy_change);
+	uevent_unregister_notifier(&psy_plug);
+
 	while (l != NULL) {
 		GList *next = l->next;
 		struct psy_battery *bat = l->data;

@@ -256,6 +282,9 @@ }
 	}
 
 	g_dir_close(directory);
+
+	uevent_register_notifier(&psy_change);
+	uevent_register_notifier(&psy_plug);
 
 	return batteries != NULL;
 }