src/test/test-libudev.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <stdio.h>
  21 #include <stdarg.h>
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <getopt.h>
  27 #include <syslog.h>
  28 #include <fcntl.h>
  29 #include <sys/epoll.h>
  30
  31 #include "libudev.h"
  32 #include "udev-util.h"
  33 #include "util.h"
  34
  35 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  36
  37 static void log_fn(struct udev *udev,
  38                    int priority, const char *file, int line, const char *fn,
  39                    const char *format, va_list args) {
  40         printf("test-libudev: %s %s:%d ", fn, file, line);
  41         vprintf(format, args);
  42 }
  43
  44 static void print_device(struct udev_device *device) {
  45         const char *str;
  46         dev_t devnum;
  47         int count;
  48         struct udev_list_entry *list_entry;
  49
  50         printf("*** device: %p ***\n", device);
  51         str = udev_device_get_action(device);
  52         if (str != NULL)
  53                 printf("action:    '%s'\n", str);
  54
  55         str = udev_device_get_syspath(device);
  56         printf("syspath:   '%s'\n", str);
  57
  58         str = udev_device_get_sysname(device);
  59         printf("sysname:   '%s'\n", str);
  60
  61         str = udev_device_get_sysnum(device);
  62         if (str != NULL)
  63                 printf("sysnum:    '%s'\n", str);
  64
  65         str = udev_device_get_devpath(device);
  66         printf("devpath:   '%s'\n", str);
  67
  68         str = udev_device_get_subsystem(device);
  69         if (str != NULL)
  70                 printf("subsystem: '%s'\n", str);
  71
  72         str = udev_device_get_devtype(device);
  73         if (str != NULL)
  74                 printf("devtype:   '%s'\n", str);
  75
  76         str = udev_device_get_driver(device);
  77         if (str != NULL)
  78                 printf("driver:    '%s'\n", str);
  79
  80         str = udev_device_get_devnode(device);
  81         if (str != NULL)
  82                 printf("devname:   '%s'\n", str);
  83
  84         devnum = udev_device_get_devnum(device);
  85         if (major(devnum) > 0)
  86                 printf("devnum:    %u:%u\n", major(devnum), minor(devnum));
  87
  88         count = 0;
  89         udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(device)) {
  90                 printf("link:      '%s'\n", udev_list_entry_get_name(list_entry));
  91                 count++;
  92         }
  93         if (count > 0)
  94                 printf("found %i links\n", count);
  95
  96         count = 0;
  97         udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(device)) {
  98                 printf("property:  '%s=%s'\n",
  99                        udev_list_entry_get_name(list_entry),
 100                        udev_list_entry_get_value(list_entry));
 101                 count++;
 102         }
 103         if (count > 0)
 104                 printf("found %i properties\n", count);
 105
 106         str = udev_device_get_property_value(device, "MAJOR");
 107         if (str != NULL)
 108                 printf("MAJOR: '%s'\n", str);
 109
 110         str = udev_device_get_sysattr_value(device, "dev");
 111         if (str != NULL)
 112                 printf("attr{dev}: '%s'\n", str);
 113
 114         printf("\n");
 115 }
 116
 117 static int test_device(struct udev *udev, const char *syspath) {
 118         _cleanup_udev_device_unref_ struct udev_device *device;
 119
 120         printf("looking at device: %s\n", syspath);
 121         device = udev_device_new_from_syspath(udev, syspath);
 122         if (device == NULL) {
 123                 printf("no device found\n");
 124                 return -1;
 125         }
 126         print_device(device);
 127
 128         return 0;
 129 }
 130
 131 static int test_device_parents(struct udev *udev, const char *syspath) {
 132         _cleanup_udev_device_unref_ struct udev_device *device;
 133         struct udev_device *device_parent;
 134
 135         printf("looking at device: %s\n", syspath);
 136         device = udev_device_new_from_syspath(udev, syspath);
 137         if (device == NULL)
 138                 return -1;
 139
 140         printf("looking at parents\n");
 141         device_parent = device;
 142         do {
 143                 print_device(device_parent);
 144                 device_parent = udev_device_get_parent(device_parent);
 145         } while (device_parent != NULL);
 146
 147         printf("looking at parents again\n");
 148         device_parent = device;
 149         do {
 150                 print_device(device_parent);
 151                 device_parent = udev_device_get_parent(device_parent);
 152         } while (device_parent != NULL);
 153
 154         return 0;
 155 }
 156
 157 static int test_device_devnum(struct udev *udev) {
 158         dev_t devnum = makedev(1, 3);
 159         struct udev_device *device;
 160
 161         printf("looking up device: %u:%u\n", major(devnum), minor(devnum));
 162         device = udev_device_new_from_devnum(udev, 'c', devnum);
 163         if (device == NULL)
 164                 return -1;
 165         print_device(device);
 166         udev_device_unref(device);
 167         return 0;
 168 }
 169
 170 static int test_device_subsys_name(struct udev *udev) {
 171         struct udev_device *device;
 172
 173         printf("looking up device: 'block':'sda'\n");
 174         device = udev_device_new_from_subsystem_sysname(udev, "block", "sda");
 175         if (device == NULL)
 176                 return -1;
 177         print_device(device);
 178         udev_device_unref(device);
 179
 180         printf("looking up device: 'subsystem':'pci'\n");
 181         device = udev_device_new_from_subsystem_sysname(udev, "subsystem", "pci");
 182         if (device == NULL)
 183                 return -1;
 184         print_device(device);
 185         udev_device_unref(device);
 186
 187         printf("looking up device: 'drivers':'scsi:sd'\n");
 188         device = udev_device_new_from_subsystem_sysname(udev, "drivers", "scsi:sd");
 189         if (device == NULL)
 190                 return -1;
 191         print_device(device);
 192         udev_device_unref(device);
 193
 194         printf("looking up device: 'module':'printk'\n");
 195         device = udev_device_new_from_subsystem_sysname(udev, "module", "printk");
 196         if (device == NULL)
 197                 return -1;
 198         print_device(device);
 199         udev_device_unref(device);
 200         return 0;
 201 }
 202
 203 static int test_enumerate_print_list(struct udev_enumerate *enumerate) {
 204         struct udev_list_entry *list_entry;
 205         int count = 0;
 206
 207         udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(enumerate)) {
 208                 struct udev_device *device;
 209
 210                 device = udev_device_new_from_syspath(udev_enumerate_get_udev(enumerate),
 211                                                       udev_list_entry_get_name(list_entry));
 212                 if (device != NULL) {
 213                         printf("device: '%s' (%s)\n",
 214                                udev_device_get_syspath(device),
 215                                udev_device_get_subsystem(device));
 216                         udev_device_unref(device);
 217                         count++;
 218                 }
 219         }
 220         printf("found %i devices\n\n", count);
 221         return count;
 222 }
 223
 224 static int test_monitor(struct udev *udev) {
 225         struct udev_monitor *udev_monitor = NULL;
 226         int fd_ep;
 227         int fd_udev = -1;
 228         struct epoll_event ep_udev, ep_stdin;
 229
 230         fd_ep = epoll_create1(EPOLL_CLOEXEC);
 231         if (fd_ep < 0) {
 232                 printf("error creating epoll fd: %m\n");
 233                 goto out;
 234         }
 235
 236         udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
 237         if (udev_monitor == NULL) {
 238                 printf("no socket\n");
 239                 goto out;
 240         }
 241         fd_udev = udev_monitor_get_fd(udev_monitor);
 242
 243         if (udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "block", NULL) < 0 ||
 244             udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "tty", NULL) < 0 ||
 245             udev_monitor_filter_add_match_subsystem_devtype(udev_monitor, "usb", "usb_device") < 0) {
 246                 printf("filter failed\n");
 247                 goto out;
 248         }
 249
 250         if (udev_monitor_enable_receiving(udev_monitor) < 0) {
 251                 printf("bind failed\n");
 252                 goto out;
 253         }
 254
 255         memset(&ep_udev, 0, sizeof(struct epoll_event));
 256         ep_udev.events = EPOLLIN;
 257         ep_udev.data.fd = fd_udev;
 258         if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_udev, &ep_udev) < 0) {
 259                 printf("fail to add fd to epoll: %m\n");
 260                 goto out;
 261         }
 262
 263         memset(&ep_stdin, 0, sizeof(struct epoll_event));
 264         ep_stdin.events = EPOLLIN;
 265         ep_stdin.data.fd = STDIN_FILENO;
 266         if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, STDIN_FILENO, &ep_stdin) < 0) {
 267                 printf("fail to add fd to epoll: %m\n");
 268                 goto out;
 269         }
 270
 271         for (;;) {
 272                 int fdcount;
 273                 struct epoll_event ev[4];
 274                 struct udev_device *device;
 275                 int i;
 276
 277                 printf("waiting for events from udev, press ENTER to exit\n");
 278                 fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), -1);
 279                 printf("epoll fd count: %i\n", fdcount);
 280
 281                 for (i = 0; i < fdcount; i++) {
 282                         if (ev[i].data.fd == fd_udev && ev[i].events & EPOLLIN) {
 283                                 device = udev_monitor_receive_device(udev_monitor);
 284                                 if (device == NULL) {
 285                                         printf("no device from socket\n");
 286                                         continue;
 287                                 }
 288                                 print_device(device);
 289                                 udev_device_unref(device);
 290                         } else if (ev[i].data.fd == STDIN_FILENO && ev[i].events & EPOLLIN) {
 291                                 printf("exiting loop\n");
 292                                 goto out;
 293                         }
 294                 }
 295         }
 296 out:
 297         if (fd_ep >= 0)
 298                 close(fd_ep);
 299         udev_monitor_unref(udev_monitor);
 300         return 0;
 301 }
 302
 303 static int test_queue(struct udev *udev) {
 304         struct udev_queue *udev_queue;
 305         unsigned long long int seqnum;
 306         struct udev_list_entry *list_entry;
 307
 308         udev_queue = udev_queue_new(udev);
 309         if (udev_queue == NULL)
 310                 return -1;
 311         seqnum = udev_queue_get_kernel_seqnum(udev_queue);
 312         printf("seqnum kernel: %llu\n", seqnum);
 313         seqnum = udev_queue_get_udev_seqnum(udev_queue);
 314         printf("seqnum udev  : %llu\n", seqnum);
 315
 316         if (udev_queue_get_queue_is_empty(udev_queue))
 317                 printf("queue is empty\n");
 318         printf("get queue list\n");
 319         udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
 320                 printf("queued: '%s' [%s]\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry));
 321         printf("\n");
 322         printf("get queue list again\n");
 323         udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
 324                 printf("queued: '%s' [%s]\n", udev_list_entry_get_name(list_entry), udev_list_entry_get_value(list_entry));
 325         printf("\n");
 326
 327         list_entry = udev_queue_get_queued_list_entry(udev_queue);
 328         if (list_entry != NULL) {
 329                 printf("event [%llu] is queued\n", seqnum);
 330                 seqnum = strtoull(udev_list_entry_get_value(list_entry), NULL, 10);
 331                 if (udev_queue_get_seqnum_is_finished(udev_queue, seqnum))
 332                         printf("event [%llu] is not finished\n", seqnum);
 333                 else
 334                         printf("event [%llu] is finished\n", seqnum);
 335         }
 336         printf("\n");
 337         udev_queue_unref(udev_queue);
 338         return 0;
 339 }
 340
 341 static int test_enumerate(struct udev *udev, const char *subsystem) {
 342         struct udev_enumerate *udev_enumerate;
 343
 344         printf("enumerate '%s'\n", subsystem == NULL ? "<all>" : subsystem);
 345         udev_enumerate = udev_enumerate_new(udev);
 346         if (udev_enumerate == NULL)
 347                 return -1;
 348         udev_enumerate_add_match_subsystem(udev_enumerate, subsystem);
 349         udev_enumerate_scan_devices(udev_enumerate);
 350         test_enumerate_print_list(udev_enumerate);
 351         udev_enumerate_unref(udev_enumerate);
 352
 353         printf("enumerate 'net' + duplicated scan + null + zero\n");
 354         udev_enumerate = udev_enumerate_new(udev);
 355         if (udev_enumerate == NULL)
 356                 return -1;
 357         udev_enumerate_add_match_subsystem(udev_enumerate, "net");
 358         udev_enumerate_scan_devices(udev_enumerate);
 359         udev_enumerate_scan_devices(udev_enumerate);
 360         udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
 361         udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
 362         udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
 363         udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
 364         udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
 365         udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
 366         udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/null");
 367         udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
 368         udev_enumerate_add_syspath(udev_enumerate, "/sys/class/mem/zero");
 369         udev_enumerate_scan_devices(udev_enumerate);
 370         test_enumerate_print_list(udev_enumerate);
 371         udev_enumerate_unref(udev_enumerate);
 372
 373         printf("enumerate 'block'\n");
 374         udev_enumerate = udev_enumerate_new(udev);
 375         if (udev_enumerate == NULL)
 376                 return -1;
 377         udev_enumerate_add_match_subsystem(udev_enumerate,"block");
 378         udev_enumerate_add_match_is_initialized(udev_enumerate);
 379         udev_enumerate_scan_devices(udev_enumerate);
 380         test_enumerate_print_list(udev_enumerate);
 381         udev_enumerate_unref(udev_enumerate);
 382
 383         printf("enumerate 'not block'\n");
 384         udev_enumerate = udev_enumerate_new(udev);
 385         if (udev_enumerate == NULL)
 386                 return -1;
 387         udev_enumerate_add_nomatch_subsystem(udev_enumerate, "block");
 388         udev_enumerate_scan_devices(udev_enumerate);
 389         test_enumerate_print_list(udev_enumerate);
 390         udev_enumerate_unref(udev_enumerate);
 391
 392         printf("enumerate 'pci, mem, vc'\n");
 393         udev_enumerate = udev_enumerate_new(udev);
 394         if (udev_enumerate == NULL)
 395                 return -1;
 396         udev_enumerate_add_match_subsystem(udev_enumerate, "pci");
 397         udev_enumerate_add_match_subsystem(udev_enumerate, "mem");
 398         udev_enumerate_add_match_subsystem(udev_enumerate, "vc");
 399         udev_enumerate_scan_devices(udev_enumerate);
 400         test_enumerate_print_list(udev_enumerate);
 401         udev_enumerate_unref(udev_enumerate);
 402
 403         printf("enumerate 'subsystem'\n");
 404         udev_enumerate = udev_enumerate_new(udev);
 405         if (udev_enumerate == NULL)
 406                 return -1;
 407         udev_enumerate_scan_subsystems(udev_enumerate);
 408         test_enumerate_print_list(udev_enumerate);
 409         udev_enumerate_unref(udev_enumerate);
 410
 411         printf("enumerate 'property IF_FS_*=filesystem'\n");
 412         udev_enumerate = udev_enumerate_new(udev);
 413         if (udev_enumerate == NULL)
 414                 return -1;
 415         udev_enumerate_add_match_property(udev_enumerate, "ID_FS*", "filesystem");
 416         udev_enumerate_scan_devices(udev_enumerate);
 417         test_enumerate_print_list(udev_enumerate);
 418         udev_enumerate_unref(udev_enumerate);
 419         return 0;
 420 }
 421
 422 static void test_hwdb(struct udev *udev, const char *modalias) {
 423         struct udev_hwdb *hwdb;
 424         struct udev_list_entry *entry;
 425
 426         hwdb = udev_hwdb_new(udev);
 427
 428         udev_list_entry_foreach(entry, udev_hwdb_get_properties_list_entry(hwdb, modalias, 0))
 429                 printf("'%s'='%s'\n", udev_list_entry_get_name(entry), udev_list_entry_get_value(entry));
 430         printf("\n");
 431
 432         hwdb = udev_hwdb_unref(hwdb);
 433         assert(hwdb == NULL);
 434 }
 435
 436 int main(int argc, char *argv[]) {
 437         struct udev *udev = NULL;
 438         static const struct option options[] = {
 439                 { "syspath", required_argument, NULL, 'p' },
 440                 { "subsystem", required_argument, NULL, 's' },
 441                 { "debug", no_argument, NULL, 'd' },
 442                 { "help", no_argument, NULL, 'h' },
 443                 { "version", no_argument, NULL, 'V' },
 444                 {}
 445         };
 446         const char *syspath = "/devices/virtual/mem/null";
 447         const char *subsystem = NULL;
 448         char path[1024];
 449
 450         udev = udev_new();
 451         printf("context: %p\n", udev);
 452         if (udev == NULL) {
 453                 printf("no context\n");
 454                 return 1;
 455         }
 456         udev_set_log_fn(udev, log_fn);
 457         printf("set log: %p\n", log_fn);
 458
 459         for (;;) {
 460                 int option;
 461
 462                 option = getopt_long(argc, argv, "+p:s:dhV", options, NULL);
 463                 if (option == -1)
 464                         break;
 465
 466                 switch (option) {
 467                 case 'p':
 468                         syspath = optarg;
 469                         break;
 470                 case 's':
 471                         subsystem = optarg;
 472                         break;
 473                 case 'd':
 474                         if (udev_get_log_priority(udev) < LOG_INFO)
 475                                 udev_set_log_priority(udev, LOG_INFO);
 476                         break;
 477                 case 'h':
 478                         printf("--debug --syspath= --subsystem= --help\n");
 479                         goto out;
 480                 case 'V':
 481                         printf("%s\n", VERSION);
 482                         goto out;
 483                 default:
 484                         goto out;
 485                 }
 486         }
 487
 488         /* add sys path if needed */
 489         if (!startswith(syspath, "/sys")) {
 490                 snprintf(path, sizeof(path), "/sys/%s", syspath);
 491                 syspath = path;
 492         }
 493
 494         test_device(udev, syspath);
 495         test_device_devnum(udev);
 496         test_device_subsys_name(udev);
 497         test_device_parents(udev, syspath);
 498
 499         test_enumerate(udev, subsystem);
 500
 501         test_queue(udev);
 502
 503         test_hwdb(udev, "usb:v0D50p0011*");
 504
 505         test_monitor(udev);
 506 out:
 507         udev_unref(udev);
 508         return 0;
 509 }