X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Fudev-watch.c;h=e2c096af0f4d0f3459f57805815894c9c7d4c564;hp=2d672e211cf4eaf3e1f7f476d74352d24857981b;hb=977f6f4b3dfbdd32d7df5a774a4ed761d5d4b98f;hpb=047f88bca31f364253fe230a1c2ec7fbc43c7fc3

diff --git a/udev/udev-watch.c b/udev/udev-watch.c
index 2d672e211..e2c096af0 100644
--- a/udev/udev-watch.c
+++ b/udev/udev-watch.c
@@ -85,6 +85,7 @@ void udev_watch_restore(struct udev *udev)
 		while ((ent = readdir(dir)) != NULL) {
 			char path[UTIL_PATH_SIZE];
 			char buf[UTIL_PATH_SIZE];
+			ssize_t syslen;
 			ssize_t len;
 			struct udev_device *dev;
 
@@ -95,13 +96,13 @@ void udev_watch_restore(struct udev *udev)
 			util_strlcat(path, "/", sizeof(path));
 			util_strlcat(path, ent->d_name, sizeof(path));
 
-			len = readlink(path, buf, sizeof(buf));
-			if (len <= 0) {
+			syslen = util_strlcpy(buf, udev_get_sys_path(udev), sizeof(buf));
+			len = readlink(path, &buf[syslen], sizeof(buf)-syslen);
+			if (len <= 0 || len >= (ssize_t)(sizeof(buf)-syslen)) {
 				unlink(path);
 				continue;
 			}
-
-			buf[len] = '\0';
+			buf[syslen + len] = '\0';
 			dbg(udev, "old watch to '%s' found\n", buf);
 			dev = udev_device_new_from_syspath(udev, buf);
 			if (dev == NULL) {
@@ -124,48 +125,35 @@ void udev_watch_restore(struct udev *udev)
 	}
 }
 
-static const char *udev_watch_filename(struct udev *udev, int wd)
-{
-	static char filename[UTIL_PATH_SIZE];
-	char str[32];
-
-	sprintf(str, "%d", wd);
-	util_strlcpy(filename, udev_get_dev_path(udev), sizeof(filename));
-	util_strlcat(filename, "/.udev/watch/", sizeof(filename));
-	util_strlcat(filename, str, sizeof(filename));
-
-	return filename;
-}
-
 void udev_watch_begin(struct udev *udev, struct udev_device *dev)
 {
-	const char *filename;
+	char filename[UTIL_PATH_SIZE];
 	int wd;
 
-	if (inotify_fd < 0 || major(udev_device_get_devnum(dev)) == 0)
+	if (inotify_fd < 0)
 		return;
 
+	info(udev, "adding watch on '%s'\n", udev_device_get_devnode(dev));
 	wd = inotify_add_watch(inotify_fd, udev_device_get_devnode(dev), IN_CLOSE_WRITE);
 	if (wd < 0) {
 		err(udev, "inotify_add_watch(%d, %s, %o) failed: %m\n",
 		    inotify_fd, udev_device_get_devnode(dev), IN_CLOSE_WRITE);
 	}
 
-	filename = udev_watch_filename(udev, wd);
+	snprintf(filename, sizeof(filename), "%s/.udev/watch/%d", udev_get_dev_path(udev), wd);
 	util_create_path(udev, filename);
 	unlink(filename);
-	symlink(udev_device_get_syspath(dev), filename);
+	symlink(udev_device_get_devpath(dev), filename);
 
 	udev_device_set_watch_handle(dev, wd);
-	udev_device_update_db(dev);
 }
 
 void udev_watch_end(struct udev *udev, struct udev_device *dev)
 {
 	int wd;
-	const char *filename;
+	char filename[UTIL_PATH_SIZE];
 
-	if (inotify_fd < 0 || major(udev_device_get_devnum(dev)) == 0)
+	if (inotify_fd < 0)
 		return;
 
 	wd = udev_device_get_watch_handle(dev);
@@ -175,27 +163,27 @@ void udev_watch_end(struct udev *udev, struct udev_device *dev)
 	info(udev, "removing watch on '%s'\n", udev_device_get_devnode(dev));
 	inotify_rm_watch(inotify_fd, wd);
 
-	filename = udev_watch_filename(udev, wd);
+	snprintf(filename, sizeof(filename), "%s/.udev/watch/%d", udev_get_dev_path(udev), wd);
 	unlink(filename);
 
 	udev_device_set_watch_handle(dev, -1);
-	udev_device_update_db(dev);
 }
 
 struct udev_device *udev_watch_lookup(struct udev *udev, int wd)
 {
-	const char *filename;
+	char filename[UTIL_PATH_SIZE];
 	char buf[UTIL_PATH_SIZE];
+	ssize_t syslen;
 	ssize_t len;
 
 	if (inotify_fd < 0 || wd < 0)
 		return NULL;
 
-	filename = udev_watch_filename(udev, wd);
-	len = readlink(filename, buf, sizeof(buf));
-	if (len > 0) {
-		buf[len] = '\0';
-
+	snprintf(filename, sizeof(filename), "%s/.udev/watch/%d", udev_get_dev_path(udev), wd);
+	syslen = util_strlcpy(buf, udev_get_sys_path(udev), sizeof(buf));
+	len = readlink(filename, &buf[syslen], sizeof(buf)-syslen);
+	if (len > 0 || len < (ssize_t)(sizeof(buf)-syslen)) {
+		buf[syslen + len] = '\0';
 		return udev_device_new_from_syspath(udev, buf);
 	}