udevadm monitor - add --subsystem-match=

diff --git a/udev/udevadm-monitor.c b/udev/udevadm-monitor.c
index b5897b9ff8d5586f4980009445f1e56e3ea6f124..92215b671bb96310df4ad10cf38b463db3b09dcd 100644 (file)
--- a/udev/udevadm-monitor.c
+++ b/udev/udevadm-monitor.c
@@ -71,6 +71,7 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
        int env = 0;
        int print_kernel = 0;
        int print_udev = 0;
+       struct udev_list_node subsystem_match_list;
        struct udev_monitor *udev_monitor = NULL;
        struct udev_monitor *kernel_monitor = NULL;
        fd_set readfds;
@@ -80,12 +81,14 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
                { "environment", no_argument, NULL, 'e' },
                { "kernel", no_argument, NULL, 'k' },
                { "udev", no_argument, NULL, 'u' },
+               { "subsystem-match", required_argument, NULL, 's' },
                { "help", no_argument, NULL, 'h' },
                {}
        };
 
+       udev_list_init(&subsystem_match_list);
        while (1) {
-               option = getopt_long(argc, argv, "ekuh", options, NULL);
+               option = getopt_long(argc, argv, "ekus:h", options, NULL);
                if (option == -1)
                        break;
 
@@ -99,6 +102,9 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
                case 'u':
                        print_udev = 1;
                        break;
+               case 's':
+                       udev_list_entry_add(udev, &subsystem_match_list, optarg, NULL, 1, 0);
+                       break;
                case 'h':
                        printf("Usage: udevadm monitor [--environment] [--kernel] [--udev] [--help]\n"
                               "  --env    print the whole event environment\n"
@@ -125,12 +131,22 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
 
        printf("monitor will print the received events for:\n");
        if (print_udev) {
+               struct udev_list_entry *entry;
+
                udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
                if (udev_monitor == NULL) {
                        fprintf(stderr, "error: unable to create netlink socket\n");
                        rc = 1;
                        goto out;
                }
+
+               udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
+                       const char *subsys = udev_list_entry_get_name(entry);
+
+                       if (udev_monitor_filter_add_match_subsystem(udev_monitor, subsys) < 0)
+                               fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
+               }
+
                if (udev_monitor_enable_receiving(udev_monitor) < 0) {
                        fprintf(stderr, "error: unable to subscribe to udev events\n");
                        rc = 2;
@@ -195,5 +211,6 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
 out:
        udev_monitor_unref(udev_monitor);
        udev_monitor_unref(kernel_monitor);
+       udev_list_cleanup_entries(udev, &subsystem_match_list);
        return rc;
 }