udev/udevadm-monitor.c

   1 /*
   2  * Copyright (C) 2004-2009 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         sigset_t mask;
  71         int option;
  72         int prop = 0;
  73         int print_kernel = 0;
  74         int print_udev = 0;
  75         struct udev_list_node subsystem_match_list;
  76         struct udev_monitor *udev_monitor = NULL;
  77         struct udev_monitor *kernel_monitor = NULL;
  78         fd_set readfds;
  79         int rc = 0;
  80
  81         static const struct option options[] = {
  82                 { "property", no_argument, NULL, 'p' },
  83                 { "environment", no_argument, NULL, 'e' },
  84                 { "kernel", no_argument, NULL, 'k' },
  85                 { "udev", no_argument, NULL, 'u' },
  86                 { "subsystem-match", required_argument, NULL, 's' },
  87                 { "help", no_argument, NULL, 'h' },
  88                 {}
  89         };
  90
  91         udev_list_init(&subsystem_match_list);
  92         while (1) {
  93                 option = getopt_long(argc, argv, "epkus:h", options, NULL);
  94                 if (option == -1)
  95                         break;
  96
  97                 switch (option) {
  98                 case 'p':
  99                 case 'e':
 100                         prop = 1;
 101                         break;
 102                 case 'k':
 103                         print_kernel = 1;
 104                         break;
 105                 case 'u':
 106                         print_udev = 1;
 107                         break;
 108                 case 's':
 109                         {
 110                                 char subsys[UTIL_NAME_SIZE];
 111                                 char *devtype;
 112
 113                                 util_strscpy(subsys, sizeof(subsys), optarg);
 114                                 devtype = strchr(subsys, ':');
 115                                 if (devtype != NULL) {
 116                                         devtype[0] = '\0';
 117                                         devtype++;
 118                                 }
 119                                 udev_list_entry_add(udev, &subsystem_match_list, subsys, devtype, 0, 0);
 120                                 break;
 121                         }
 122                 case 'h':
 123                         printf("Usage: udevadm monitor [--property] [--kernel] [--udev] [--help]\n"
 124                                "  --property                    print the event properties\n"
 125                                "  --kernel                      print kernel uevents\n"
 126                                "  --udev                        print udev events\n"
 127                                "  --subsystem-match=<subsystem> filter events\n"
 128                                "  --help\n\n");
 129                 default:
 130                         goto out;
 131                 }
 132         }
 133
 134         if (!print_kernel && !print_udev) {
 135                 print_kernel = 1;
 136                 print_udev =1;
 137         }
 138
 139         /* set signal handlers */
 140         memset(&act, 0x00, sizeof(struct sigaction));
 141         act.sa_handler = sig_handler;
 142         sigemptyset(&act.sa_mask);
 143         act.sa_flags = SA_RESTART;
 144         sigaction(SIGINT, &act, NULL);
 145         sigaction(SIGTERM, &act, NULL);
 146         sigemptyset(&mask);
 147         sigaddset(&mask, SIGINT);
 148         sigaddset(&mask, SIGTERM);
 149         sigprocmask(SIG_UNBLOCK, &mask, NULL);
 150
 151         printf("monitor will print the received events for:\n");
 152         if (print_udev) {
 153                 struct udev_list_entry *entry;
 154
 155                 udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 156                 if (udev_monitor == NULL) {
 157                         fprintf(stderr, "error: unable to create netlink socket\n");
 158                         rc = 1;
 159                         goto out;
 160                 }
 161                 udev_monitor_set_receive_buffer_size(udev_monitor, 128*1024*1024);
 162
 163                 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
 164                         const char *subsys = udev_list_entry_get_name(entry);
 165                         const char *devtype = udev_list_entry_get_value(entry);
 166
 167                         if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, subsys, devtype) < 0)
 168                                 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
 169                 }
 170
 171                 if (udev_monitor_enable_receiving(udev_monitor) < 0) {
 172                         fprintf(stderr, "error: unable to subscribe to udev events\n");
 173                         rc = 2;
 174                         goto out;
 175                 }
 176                 printf("UDEV - the event which udev sends out after rule processing\n");
 177         }
 178         if (print_kernel) {
 179                 struct udev_list_entry *entry;
 180
 181                 kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel");
 182                 if (kernel_monitor == NULL) {
 183                         fprintf(stderr, "error: unable to create netlink socket\n");
 184                         rc = 3;
 185                         goto out;
 186                 }
 187                 udev_monitor_set_receive_buffer_size(udev, 128*1024*1024);
 188
 189                 udev_list_entry_foreach(entry, udev_list_get_entry(&subsystem_match_list)) {
 190                         const char *subsys = udev_list_entry_get_name(entry);
 191
 192                         if (udev_monitor_filter_add_match_subsystem_devtype(kernel_monitor, subsys, NULL) < 0)
 193                                 fprintf(stderr, "error: unable to apply subsystem filter '%s'\n", subsys);
 194                 }
 195
 196                 if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
 197                         fprintf(stderr, "error: unable to subscribe to kernel events\n");
 198                         rc = 4;
 199                         goto out;
 200                 }
 201                 printf("KERNEL - the kernel uevent\n");
 202         }
 203         printf("\n");
 204
 205         while (!udev_exit) {
 206                 int fdcount;
 207
 208                 FD_ZERO(&readfds);
 209                 if (kernel_monitor != NULL)
 210                         FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
 211                 if (udev_monitor != NULL)
 212                         FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
 213
 214                 fdcount = select(MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
 215                                  &readfds, NULL, NULL, NULL);
 216                 if (fdcount < 0) {
 217                         if (errno != EINTR)
 218                                 fprintf(stderr, "error receiving uevent message: %m\n");
 219                         continue;
 220                 }
 221
 222                 if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
 223                         struct udev_device *device;
 224
 225                         device = udev_monitor_receive_device(kernel_monitor);
 226                         if (device == NULL)
 227                                 continue;
 228                         print_device(device, "KERNEL", prop);
 229                         udev_device_unref(device);
 230                 }
 231
 232                 if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
 233                         struct udev_device *device;
 234
 235                         device = udev_monitor_receive_device(udev_monitor);
 236                         if (device == NULL)
 237                                 continue;
 238                         print_device(device, "UDEV", prop);
 239                         udev_device_unref(device);
 240                 }
 241         }
 242
 243 out:
 244         udev_monitor_unref(udev_monitor);
 245         udev_monitor_unref(kernel_monitor);
 246         udev_list_cleanup_entries(udev, &subsystem_match_list);
 247         return rc;
 248 }