udev/udevadm-monitor.c

   1 /*
   2  * Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <unistd.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <stddef.h>
  22 #include <string.h>
  23 #include <fcntl.h>
  24 #include <errno.h>
  25 #include <signal.h>
  26 #include <getopt.h>
  27 #include <sys/time.h>
  28 #include <sys/socket.h>
  29 #include <sys/un.h>
  30 #include <sys/select.h>
  31 #include <linux/types.h>
  32 #include <linux/netlink.h>
  33
  34 #include "udev.h"
  35
  36 static int udev_exit;
  37
  38 static void sig_handler(int signum)
  39 {
  40         if (signum == SIGINT || signum == SIGTERM)
  41                 udev_exit = 1;
  42 }
  43
  44 static void print_device(struct udev_device *device, const char *source, int prop)
  45 {
  46         struct timeval tv;
  47         struct timezone tz;
  48
  49         gettimeofday(&tv, &tz);
  50         printf("%-6s[%llu.%06u] %-8s %s (%s)\n",
  51                source,
  52                (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec,
  53                udev_device_get_action(device),
  54                udev_device_get_devpath(device),
  55                udev_device_get_subsystem(device));
  56         if (prop) {
  57                 struct udev_list_entry *list_entry;
  58
  59                 udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device))
  60                         printf("%s=%s\n",
  61                                udev_list_entry_get_name(list_entry),
  62                                udev_list_entry_get_value(list_entry));
  63                 printf("\n");
  64         }
  65 }
  66
  67 int udevadm_monitor(struct udev *udev, int argc, char *argv[])
  68 {
  69         struct sigaction act;
  70         int option;
  71         int prop = 0;
  72         int print_kernel = 0;
  73         int print_udev = 0;
  74         struct udev_list_node subsystem_match_list;
  75         struct udev_monitor *udev_monitor = NULL;
  76         struct udev_monitor *kernel_monitor = NULL;
  77         fd_set readfds;
  78         int rc = 0;
  79
  80         static const struct option options[] = {
  81                 { "property", no_argument, NULL, 'p' },
  82                 { "environment", no_argument, NULL, 'e' },
  83                 { "kernel", no_argument, NULL, 'k' },
  84                 { "udev", no_argument, NULL, 'u' },
  85                 { "subsystem-match", required_argument, NULL, 's' },
  86                 { "help", no_argument, NULL, 'h' },
  87                 {}
  88         };
  89
  90         udev_list_init(&subsystem_match_list);
  91         while (1) {
  92                 option = getopt_long(argc, argv, "epkus:h", options, NULL);
  93                 if (option == -1)
  94                         break;
  95
  96                 switch (option) {
  97                 case 'p':
  98                 case 'e':
  99                         prop = 1;
 100                         break;
 101                 case 'k':
 102                         print_kernel = 1;
 103                         break;
 104                 case 'u':
 105                         print_udev = 1;
 106                         break;
 107                 case 's':
 108                         {
 109                                 char subsys[UTIL_NAME_SIZE];
 110                                 char *devtype;
 111
 112                                 util_strscpy(subsys, sizeof(subsys), optarg);
 113                                 devtype = strchr(subsys, ':');
 114                                 if (devtype != NULL) {
 115                                         devtype[0] = '\0';
 116                                         devtype++;
 117                                 }
 118                                 udev_list_entry_add(udev, &subsystem_match_list, subsys, devtype, 0, 0);
 119                                 break;
 120                         }
 121                 case 'h':
 122                         printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
 123                                "  --property                    print the event properties\n"
 124                                "  --kernel                      print kernel uevents\n"
 125                                "  --udev                        print udev events\n"
 126                                "  --subsystem-match=<subsystem> filter events\n"
 127                                "  --help\n\n");
 128                 default:
 129                         goto out;
 130                 }
 131         }
 132
 133         if (!print_kernel && !print_udev) {
 134                 print_kernel = 1;
 135                 print_udev =1;
 136         }
 137
 138         /* set signal handlers */
 139         memset(&act, 0x00, sizeof(struct sigaction));
 140         act.sa_handler = sig_handler;
 141         sigemptyset(&act.sa_mask);
 142         act.sa_flags = SA_RESTART;
 143         sigaction(SIGINT, &act, NULL);
 144         sigaction(SIGTERM, &act, NULL);
 145
 146         printf("monitor will print the received events for:\n");
 147         if (print_udev) {
 148                 struct udev_list_entry *entry;
 149
 150                 udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 151                 if (udev_monitor == NULL) {
 152                         fprintf(stderr, "error: unable to create netlink socket\n");
 153                         rc = 1;
 154                         goto out;
 155                 }
 156
 157                 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
 158                         const char *subsys = udev_list_entry_get_name(entry);
 159                         const char *devtype = udev_list_entry_get_value(entry);
 160
 161                         if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
 162                                 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
 163                 }
 164
 165                 if (udev_monitor_enable_receiving(udev_monitor) < 0) {
 166                         fprintf(stderr, "error: unable to subscribe to udev events\n");
 167                         rc = 2;
 168                         goto out;
 169                 }
 170                 printf("UDEV - the event which udev sends out after rule processing\n");
 171         }
 172         if (print_kernel) {
 173                 struct udev_list_entry *entry;
 174
 175                 kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
 176                 if (kernel_monitor == NULL) {
 177                         fprintf(stderr, "error: unable to create netlink socket\n");
 178                         rc = 3;
 179                         goto out;
 180                 }
 181
 182                 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
 183                         const char *subsys = udev_list_entry_get_name(entry);
 184
 185                         if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
 186                                 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
 187                 }
 188
 189                 if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
 190                         fprintf(stderr, "error: unable to subscribe to kernel events\n");
 191                         rc = 4;
 192                         goto out;
 193                 }
 194                 printf("KERNEL - the kernel uevent\n");
 195         }
 196         printf("\n");
 197
 198         while (!udev_exit) {
 199                 int fdcount;
 200
 201                 FD_ZERO(&readfds);
 202                 if (kernel_monitor != NULL)
 203                         FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
 204                 if (udev_monitor != NULL)
 205                         FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
 206
 207                 fdcount = select(UDEV_MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
 208                                  &readfds, NULL, NULL, NULL);
 209                 if (fdcount < 0) {
 210                         if (errno != EINTR)
 211                                 fprintf(stderr, "error receiving uevent message: %m\n");
 212                         continue;
 213                 }
 214
 215                 if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
 216                         struct udev_device *device;
 217
 218                         device = udev_monitor_receive_device(kernel_monitor);
 219                         if (device == NULL)
 220                                 continue;
 221                         print_device(device, "KERNEL", prop);
 222                         udev_device_unref(device);
 223                 }
 224
 225                 if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
 226                         struct udev_device *device;
 227
 228                         device = udev_monitor_receive_device(udev_monitor);
 229                         if (device == NULL)
 230                                 continue;
 231                         print_device(device, "UDEV", prop);
 232                         udev_device_unref(device);
 233                 }
 234         }
 235
 236 out:
 237         udev_monitor_unref(udev_monitor);
 238         udev_monitor_unref(kernel_monitor);
 239         udev_list_cleanup_entries(udev, &subsystem_match_list);
 240         return rc;
 241 }