libudev: device - add get_parent_with_subsystem()

[elogind.git] / udev / lib / libudev-enumerate.c

diff --git a/udev/lib/libudev-enumerate.c b/udev/lib/libudev-enumerate.c
index 0377649cfdd2c0e8df698e90b08ed08fef09fef1..9fb154418d45741650be9d9a66e9235611b81356 100644 (file)
--- a/udev/lib/libudev-enumerate.c
+++ b/udev/lib/libudev-enumerate.c
@@ -30,6 +30,8 @@
 #include "libudev.h"
 #include "libudev-private.h"
 
+static int devices_sort(struct udev_enumerate *udev_enumerate);
+
 struct udev_enumerate {
        struct udev *udev;
        int refcount;
@@ -38,6 +40,7 @@ struct udev_enumerate {
        struct list_node subsystem_match_list;
        struct list_node subsystem_nomatch_list;
        struct list_node devices_list;
+       int devices_sorted;
 };
 
 /**
@@ -98,6 +101,8 @@ struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enumerate *ude
 {
        if (udev_enumerate == NULL)
                return NULL;
+       if (!udev_enumerate->devices_sorted)
+               devices_sort(udev_enumerate);
        return list_get_entry(&udev_enumerate->devices_list);
 }
 
@@ -200,7 +205,8 @@ static int match_attr(struct udev_enumerate *udev_enumerate, const char *syspath
        return 1;
 }
 
-static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate, const char *basedir, const char *subdir1, const char *subdir2)
+static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate,
+                                   const char *basedir, const char *subdir1, const char *subdir2)
 {
        struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
        char path[UTIL_PATH_SIZE];
@@ -231,11 +237,16 @@ static int scan_dir_and_add_devices(struct udev_enumerate *udev_enumerate, const
                util_strlcpy(syspath, path, sizeof(syspath));
                util_strlcat(syspath, "/", sizeof(syspath));
                util_strlcat(syspath, dent->d_name, sizeof(syspath));
+               if (lstat(syspath, &statbuf) != 0)
+                       continue;
+               if (S_ISREG(statbuf.st_mode))
+                       continue;
+               if (S_ISLNK(statbuf.st_mode))
+                       util_resolve_sys_link(udev, syspath, sizeof(syspath));
                util_strlcpy(filename, syspath, sizeof(filename));
                util_strlcat(filename, "/uevent", sizeof(filename));
                if (stat(filename, &statbuf) != 0)
                        continue;
-               util_resolve_sys_link(udev, syspath, sizeof(syspath));
                if (!match_attr(udev_enumerate, syspath))
                        continue;
                list_entry_add(udev, &udev_enumerate->devices_list, syspath, NULL, 1, 1);
@@ -262,7 +273,7 @@ static int match_subsystem(struct udev_enumerate *udev_enumerate, const char *su
        return 1;
 }
 
-static int scan_dir(struct udev_enumerate *udev_enumerate, const char *basedir, const char *subdir, const char *match)
+static int scan_dir(struct udev_enumerate *udev_enumerate, const char *basedir, const char *subdir, const char *subsystem)
 {
        struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
 
@@ -279,7 +290,7 @@ static int scan_dir(struct udev_enumerate *udev_enumerate, const char *basedir,
        for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
                if (dent->d_name[0] == '.')
                        continue;
-               if (!match_subsystem(udev_enumerate, match != NULL ? match : dent->d_name))
+               if (!match_subsystem(udev_enumerate, subsystem != NULL ? subsystem : dent->d_name))
                        continue;
                scan_dir_and_add_devices(udev_enumerate, basedir, dent->d_name, subdir);
        }
@@ -307,23 +318,35 @@ static int devices_delay(struct udev *udev, const char *syspath)
        return 0;
 }
 
-int udev_enumerate_add_device(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device)
+/* sort delayed devices to the end of the list */
+static int devices_sort(struct udev_enumerate *udev_enumerate)
 {
-       struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
        struct udev_list_entry *list_entry;
 
+       udev_list_entry_foreach(list_entry, list_get_entry(&udev_enumerate->devices_list)) {
+               if (devices_delay(udev_enumerate->udev, udev_list_entry_get_name(list_entry)))
+                       list_entry_move_to_end(list_entry);
+       }
+       udev_enumerate->devices_sorted = 1;
+       return 0;
+}
+
+int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate, const char *syspath)
+{
+       struct udev *udev = udev_enumerate_get_udev(udev_enumerate);
+       struct udev_device *udev_device;
+
        if (udev_enumerate == NULL)
                return -EINVAL;
-       if (udev_device == NULL)
+       if (syspath == NULL)
                return 0;
-       list_entry_add(udev,
-                      &udev_enumerate->devices_list,
+       /* resolve to real syspath */
+       udev_device = udev_device_new_from_syspath(udev_enumerate->udev, syspath);
+       if (udev_device == NULL)
+               return -EINVAL;
+       list_entry_add(udev, &udev_enumerate->devices_list,
                       udev_device_get_syspath(udev_device), NULL, 1, 1);
-       /* sort delayed devices to the end of the list */
-       udev_list_entry_foreach(list_entry, list_get_entry(&udev_enumerate->devices_list)) {
-               if (devices_delay(udev, udev_list_entry_get_name(list_entry)))
-                       list_entry_move_to_end(list_entry);
-       }
+       udev_device_unref(udev_device);
        return 0;
 }
 
@@ -400,7 +423,9 @@ int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerate)
                info(udev, "searching '%s/*' dir\n", subsysdir);
                scan_dir_and_add_devices(udev_enumerate, subsysdir, NULL, NULL);
        }
-       info(udev, "searching '%s/*/drivers/*' dir\n", subsysdir);
-       scan_dir(udev_enumerate, subsysdir, "drivers", "drivers");
+       if (match_subsystem(udev_enumerate, "drivers")) {
+               info(udev, "searching '%s/*/drivers/*' dir\n", subsysdir);
+               scan_dir(udev_enumerate, subsysdir, "drivers", "drivers");
+       }
        return 0;
 }