chiark / gitweb /
libudev: monitor - switch to filter_add_match_subsystem_devtype()
[elogind.git] / udev / udevadm-monitor.c
index 01126c9..10b2f2e 100644 (file)
@@ -71,21 +71,24 @@ 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;
        int rc = 0;
 
        static const struct option options[] = {
-               { "environment", 0, NULL, 'e' },
-               { "kernel", 0, NULL, 'k' },
-               { "udev", 0, NULL, 'u' },
-               { "help", 0, NULL, 'h' },
+               { "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;
 
@@ -99,12 +102,15 @@ 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"
                               "  --kernel print kernel uevents\n"
                               "  --udev   print udev events\n"
-                              "  --help   print this help text\n\n");
+                              "  --help\n\n");
                default:
                        goto out;
                }
@@ -115,11 +121,6 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
                print_udev =1;
        }
 
-       if (getuid() != 0 && print_kernel) {
-               fprintf(stderr, "root privileges needed to subscribe to kernel events\n");
-               goto out;
-       }
-
        /* set signal handlers */
        memset(&act, 0x00, sizeof(struct sigaction));
        act.sa_handler = (void (*)(int)) sig_handler;
@@ -130,28 +131,42 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
 
        printf("monitor will print the received events for:\n");
        if (print_udev) {
-               udev_monitor = udev_monitor_new_from_socket(udev, "@/org/kernel/udev/monitor");
+               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_devtype(udev_monitor, subsys, NULL) < 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;
                        goto out;
                }
-               printf("UDEV the event which udev sends out after rule processing\n");
+               printf("UDEV the event which udev sends out after rule processing\n");
        }
        if (print_kernel) {
-               kernel_monitor = udev_monitor_new_from_netlink(udev);
+               kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
                if (kernel_monitor == NULL) {
+                       fprintf(stderr, "error: unable to create netlink socket\n");
                        rc = 3;
                        goto out;
                }
                if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
+                       fprintf(stderr, "error: unable to subscribe to kernel events\n");
                        rc = 4;
                        goto out;
                }
-               printf("UEVENT the kernel uevent\n");
+               printf("KERNEL - the kernel uevent\n");
        }
        printf("\n");
 
@@ -168,7 +183,7 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
                                 &readfds, NULL, NULL, NULL);
                if (fdcount < 0) {
                        if (errno != EINTR)
-                               fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
+                               fprintf(stderr, "error receiving uevent message: %m\n");
                        continue;
                }
 
@@ -178,7 +193,7 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
                        device = udev_monitor_receive_device(kernel_monitor);
                        if (device == NULL)
                                continue;
-                       print_device(device, "UEVENT", env);
+                       print_device(device, "KERNEL", env);
                        udev_device_unref(device);
                }
 
@@ -196,5 +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;
 }