udev: handle all events - not only class and block devices

Handle all events with rules. If udev is expected to handle hotplug.d/
the exernal helper must be called.

Signed-off-by: Kay Sievers <kay.sievers@suse.de>

1 files changed, 64 insertions, 91 deletions

diff --git a/udev.c b/udev.c
index 3f76e98b24..d623cbcc67 100644
--- a/udev.c
+++ b/udev.c
@@ -54,39 +54,6 @@ void log_message(int priority, const char *format, ...)
 }
 #endif
 
-/* Decide if we should manage the whole uevent, including multiplexing
- * of the hotplug directories.
- * For now look if the kernel calls udevsend instead of /sbin/hotplug,
- * or the uevent-helper in /proc/sys/kernel/hotplug is empty.
- */
-static int manage_hotplug_event(void) {
-	char helper[256];
-	int fd;
-	int len;
-
-	/* don't handle hotplug.d if we are called directly */
-	if (!getenv("UDEVD_EVENT"))
-		return 0;
-
-	fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
-	if (fd < 0)
-		return 0;
-
-	len = read(fd, helper, sizeof(helper)-1);
-	close(fd);
-
-	if (len < 0)
-		return 0;
-	helper[len] = '\0';
-
-	if (helper[0] == '\0' || helper[0] == '\n')
-		return 1;
-	if (strstr(helper, "udevsend"))
-		return 1;
-
-	return 0;
-}
-
 static void asmlinkage sig_handler(int signum)
 {
 	switch (signum) {
@@ -100,15 +67,12 @@ static void asmlinkage sig_handler(int signum)
 
 int main(int argc, char *argv[], char *envp[])
 {
-	struct sysfs_class_device *class_dev;
-	struct sysfs_device *devices_dev;
 	struct udevice udev;
 	char path[PATH_SIZE];
 	const char *error;
 	const char *action;
 	const char *devpath;
 	const char *subsystem;
-	int managed_event;
 	struct sigaction act;
 	int retval = -EINVAL;
 
@@ -133,11 +97,6 @@ int main(int argc, char *argv[], char *envp[])
 	/* trigger timeout to prevent hanging processes */
 	alarm(ALARM_TIMEOUT);
 
-	/* let the executed programs know if we handle the whole hotplug event */
-	managed_event = manage_hotplug_event();
-	if (managed_event)
-		setenv("MANAGED_EVENT", "1", 1);
-
 	action = getenv("ACTION");
 	devpath = getenv("DEVPATH");
 	subsystem = getenv("SUBSYSTEM");
@@ -145,14 +104,12 @@ int main(int argc, char *argv[], char *envp[])
 	if (!subsystem && argc == 2)
 		subsystem = argv[1];
 
-	udev_init_device(&udev, devpath, subsystem, action);
-
 	if (!action || !subsystem || !devpath) {
 		err("action, subsystem or devpath missing");
-		goto hotplug;
+		goto exit;
 	}
 
-	/* export logging flag, as called programs may want to do the same as udev */
+	/* export log_level , as called programs may want to do the same as udev */
 	if (udev_log_priority) {
 		char priority[32];
 
@@ -160,93 +117,109 @@ int main(int argc, char *argv[], char *envp[])
 		setenv("UDEV_LOG", priority, 1);
 	}
 
-	if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) {
-		udev_rules_init();
+	udev_init_device(&udev, devpath, subsystem, action);
+	udev_rules_init();
 
+	if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) {
+		/* handle device node */
 		if (strcmp(action, "add") == 0) {
-			/* wait for sysfs and possibly add node */
-			dbg("udev add");
-
-			/* skip subsystems without "dev", but handle net devices */
-			if (udev.type != DEV_NET && subsystem_expect_no_dev(udev.subsystem)) {
-				dbg("don't care about '%s' devices", udev.subsystem);
-				goto hotplug;
-			}
+			struct sysfs_class_device *class_dev;
 
+			/* wait for sysfs of /sys/class /sys/block */
+			dbg("node add");
 			snprintf(path, sizeof(path), "%s%s", sysfs_path, udev.devpath);
 			path[sizeof(path)-1] = '\0';
 			class_dev = wait_class_device_open(path);
 			if (class_dev == NULL) {
 				dbg("open class device failed");
-				goto hotplug;
+				goto run;
 			}
 			dbg("opened class_dev->name='%s'", class_dev->name);
-
 			wait_for_class_device(class_dev, &error);
 
-			/* name, create node, store in db */
-			retval = udev_add_device(&udev, class_dev);
-
+			/* get major/minor */
+			if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS) {
+				udev.devt = get_devt(class_dev);
+				if (udev.devt) {
+					/* name device */
+					udev_rules_get_name(&udev, class_dev);
+					if (udev.ignore_device) {
+						info("device event will be ignored");
+						goto exit;
+					}
+					if (udev.name[0] == '\0') {
+						info("device node creation supressed");
+						goto run;
+					}
+
+					/* create node, store in db */
+					retval = udev_add_device(&udev, class_dev);
+				} else {
+					dbg("no dev-file found");
+					udev_rules_get_run(&udev, NULL);
+					if (udev.ignore_device) {
+						info("device event will be ignored");
+						goto exit;
+					}
+				}
+			}
 			sysfs_close_class_device(class_dev);
 		} else if (strcmp(action, "remove") == 0) {
-			/* possibly remove a node */
-			dbg("udev remove");
-
-			/* skip subsystems without "dev" */
-			if (subsystem_expect_no_dev(udev.subsystem)) {
-				dbg("don't care about '%s' devices", udev.subsystem);
-				goto hotplug;
-			}
-
-			udev_rules_get_run(&udev);
+			dbg("node remove");
+			udev_rules_get_run(&udev, NULL);
 			if (udev.ignore_device) {
 				dbg("device event will be ignored");
-				goto hotplug;
+				goto exit;
 			}
 
-			/* get node from db, remove db-entry, delete created node */
+			/* get name from db, remove db-entry, delete node */
 			retval = udev_remove_device(&udev);
 		}
 
+		/* export name of device node or netif */
 		if (udev.devname[0] != '\0')
 			setenv("DEVNAME", udev.devname, 1);
-
-		if (udev_run && !list_empty(&udev.run_list)) {
-			struct name_entry *name_loop;
-
-			dbg("executing run list");
-			list_for_each_entry(name_loop, &udev.run_list, node)
-				execute_command(name_loop->name, udev.subsystem);
-		}
-
 	} else if (udev.type == DEV_DEVICE) {
 		if (strcmp(action, "add") == 0) {
-			/* wait for sysfs */
-			dbg("devices add");
+			struct sysfs_device *devices_dev;
 
+			/* wait for sysfs of /sys/devices/ */
+			dbg("devices add");
 			snprintf(path, sizeof(path), "%s%s", sysfs_path, devpath);
 			path[sizeof(path)-1] = '\0';
 			devices_dev = wait_devices_device_open(path);
 			if (!devices_dev) {
 				dbg("devices device unavailable (probably remove has beaten us)");
-				goto hotplug;
+				goto run;
 			}
 			dbg("devices device opened '%s'", path);
-
 			wait_for_devices_device(devices_dev, &error);
-
+			udev_rules_get_run(&udev, devices_dev);
 			sysfs_close_device(devices_dev);
+			if (udev.ignore_device) {
+				info("device event will be ignored");
+				goto exit;
+			}
 		} else if (strcmp(action, "remove") == 0) {
 			dbg("devices remove");
+			udev_rules_get_run(&udev, NULL);
+			if (udev.ignore_device) {
+				info("device event will be ignored");
+				goto exit;
+			}
 		}
-	} else {
-		dbg("unhandled");
 	}
 
-hotplug:
-	if (udev_hotplug_d && managed_event)
-		udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
+run:
+	if (udev_run && !list_empty(&udev.run_list)) {
+		struct name_entry *name_loop;
+
+		dbg("executing run list");
+		list_for_each_entry(name_loop, &udev.run_list, node)
+			execute_command(name_loop->name, udev.subsystem);
+	}
 
+exit:
 	udev_cleanup_device(&udev);
 
 	logging_close();