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