230 lines
9.4 KiB
C
230 lines
9.4 KiB
C
/*
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* Copyright (C) 2008-2009 Kay Sievers <kay@vrfy.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <errno.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include "udev.h"
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#include "udev-util.h"
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#include "util.h"
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static int verbose;
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static int dry_run;
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static void exec_list(struct udev_enumerate *udev_enumerate, const char *action) {
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struct udev_list_entry *entry;
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udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
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char filename[UTIL_PATH_SIZE];
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int fd;
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if (verbose)
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printf("%s\n", udev_list_entry_get_name(entry));
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if (dry_run)
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continue;
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strscpyl(filename, sizeof(filename), udev_list_entry_get_name(entry), "/uevent", NULL);
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fd = open(filename, O_WRONLY|O_CLOEXEC);
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if (fd < 0)
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continue;
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if (write(fd, action, strlen(action)) < 0)
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log_debug("error writing '%s' to '%s': %m", action, filename);
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close(fd);
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}
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}
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static const char *keyval(const char *str, const char **val, char *buf, size_t size) {
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char *pos;
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strscpy(buf, size,str);
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pos = strchr(buf, '=');
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if (pos != NULL) {
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pos[0] = 0;
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pos++;
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}
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*val = pos;
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return buf;
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}
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static void help(void) {
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printf("Usage: udevadm trigger OPTIONS\n"
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" -v,--verbose print the list of devices while running\n"
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" -n,--dry-run do not actually trigger the events\n"
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" -t,--type= type of events to trigger\n"
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" devices sys devices (default)\n"
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" subsystems sys subsystems and drivers\n"
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" -c,--action=<action> event action value, default is \"change\"\n"
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" -s,--subsystem-match=<subsystem> trigger devices from a matching subsystem\n"
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" -S,--subsystem-nomatch=<subsystem> exclude devices from a matching subsystem\n"
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" -a,--attr-match=<file[=<value>]> trigger devices with a matching attribute\n"
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" -A,--attr-nomatch=<file[=<value>]> exclude devices with a matching attribute\n"
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" -p,--property-match=<key>=<value> trigger devices with a matching property\n"
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" -g,--tag-match=<key>=<value> trigger devices with a matching property\n"
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" -y,--sysname-match=<name> trigger devices with a matching name\n"
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" -b,--parent-match=<name> trigger devices with that parent device\n"
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" -h,--help\n\n");
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}
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static int adm_trigger(struct udev *udev, int argc, char *argv[]) {
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static const struct option options[] = {
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{ "verbose", no_argument, NULL, 'v' },
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{ "dry-run", no_argument, NULL, 'n' },
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{ "type", required_argument, NULL, 't' },
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{ "action", required_argument, NULL, 'c' },
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{ "subsystem-match", required_argument, NULL, 's' },
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{ "subsystem-nomatch", required_argument, NULL, 'S' },
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{ "attr-match", required_argument, NULL, 'a' },
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{ "attr-nomatch", required_argument, NULL, 'A' },
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{ "property-match", required_argument, NULL, 'p' },
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{ "tag-match", required_argument, NULL, 'g' },
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{ "sysname-match", required_argument, NULL, 'y' },
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{ "parent-match", required_argument, NULL, 'b' },
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{ "help", no_argument, NULL, 'h' },
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{}
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};
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enum {
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TYPE_DEVICES,
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TYPE_SUBSYSTEMS,
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} device_type = TYPE_DEVICES;
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const char *action = "change";
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_cleanup_udev_enumerate_unref_ struct udev_enumerate *udev_enumerate = NULL;
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int c;
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udev_enumerate = udev_enumerate_new(udev);
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if (udev_enumerate == NULL)
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return 1;
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while ((c = getopt_long(argc, argv, "vno:t:c:s:S:a:A:p:g:y:b:h", options, NULL)) >= 0) {
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const char *key;
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const char *val;
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char buf[UTIL_PATH_SIZE];
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switch (c) {
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case 'v':
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verbose = 1;
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break;
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case 'n':
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dry_run = 1;
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break;
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case 't':
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if (streq(optarg, "devices"))
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device_type = TYPE_DEVICES;
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else if (streq(optarg, "subsystems"))
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device_type = TYPE_SUBSYSTEMS;
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else {
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log_error("unknown type --type=%s", optarg);
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return 2;
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}
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break;
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case 'c':
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if (!nulstr_contains("add\0" "remove\0" "change\0", optarg)) {
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log_error("unknown action '%s'", optarg);
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return 2;
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} else
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action = optarg;
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break;
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case 's':
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udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
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break;
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case 'S':
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udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
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break;
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case 'a':
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key = keyval(optarg, &val, buf, sizeof(buf));
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udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
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break;
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case 'A':
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key = keyval(optarg, &val, buf, sizeof(buf));
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udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
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break;
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case 'p':
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key = keyval(optarg, &val, buf, sizeof(buf));
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udev_enumerate_add_match_property(udev_enumerate, key, val);
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break;
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case 'g':
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udev_enumerate_add_match_tag(udev_enumerate, optarg);
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break;
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case 'y':
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udev_enumerate_add_match_sysname(udev_enumerate, optarg);
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break;
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case 'b': {
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char path[UTIL_PATH_SIZE];
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struct udev_device *dev;
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/* add sys dir if needed */
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if (!startswith(optarg, "/sys"))
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strscpyl(path, sizeof(path), "/sys", optarg, NULL);
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else
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strscpy(path, sizeof(path), optarg);
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util_remove_trailing_chars(path, '/');
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dev = udev_device_new_from_syspath(udev, path);
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if (dev == NULL) {
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log_error("unable to open the device '%s'", optarg);
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return 2;
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}
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udev_enumerate_add_match_parent(udev_enumerate, dev);
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/* drop reference immediately, enumerate pins the device as long as needed */
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udev_device_unref(dev);
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break;
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}
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case 'h':
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help();
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return 0;
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case '?':
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return 1;
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default:
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assert_not_reached("Unknown option");
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}
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}
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if (optind < argc) {
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fprintf(stderr, "Extraneous argument: '%s'\n", argv[optind]);
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return 1;
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}
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switch (device_type) {
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case TYPE_SUBSYSTEMS:
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udev_enumerate_scan_subsystems(udev_enumerate);
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exec_list(udev_enumerate, action);
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return 0;
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case TYPE_DEVICES:
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udev_enumerate_scan_devices(udev_enumerate);
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exec_list(udev_enumerate, action);
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return 0;
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default:
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assert_not_reached("device_type");
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}
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}
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const struct udevadm_cmd udevadm_trigger = {
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.name = "trigger",
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.cmd = adm_trigger,
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.help = "request events from the kernel",
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};
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