udev/udevadm.c

   1 /*
   2  * Copyright (C) 2007-2009 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 <errno.h>
  24 #include <getopt.h>
  25
  26 #include "udev.h"
  27
  28 static int debug;
  29
  30 static void log_fn(struct udev *udev, int priority,
  31                    const char *file, int line, const char *fn,
  32                    const char *format, va_list args)
  33 {
  34         if (debug) {
  35                 fprintf(stderr, "%s: ", fn);
  36                 vfprintf(stderr, format, args);
  37         } else {
  38                 vfprintf(stderr, format, args);
  39                 vsyslog(priority, format, args);
  40         }
  41 }
  42
  43 struct command {
  44         const char *name;
  45         int (*cmd)(struct udev *udev, int argc, char *argv[]);
  46         const char *help;
  47         int debug;
  48 };
  49
  50 static const struct command cmds[];
  51
  52 static int version(struct udev *udev, int argc, char *argv[])
  53 {
  54         printf("%s\n", VERSION);
  55         return 0;
  56 }
  57
  58 static int help(struct udev *udev, int argc, char *argv[])
  59 {
  60         const struct command *cmd;
  61
  62         printf("Usage: udevadm [--help] [--version] [--debug] COMMAND [COMMAND OPTIONS]\n");
  63         for (cmd = cmds; cmd->name != NULL; cmd++)
  64                 if (cmd->help != NULL)
  65                         printf("  %-12s %s\n", cmd->name, cmd->help);
  66         printf("\n");
  67         return 0;
  68 }
  69
  70 static const struct command cmds[] = {
  71         {
  72                 .name = "info",
  73                 .cmd = udevadm_info,
  74                 .help = "query sysfs or the udev database",
  75         },
  76         {
  77                 .name = "trigger",
  78                 .cmd = udevadm_trigger,
  79                 .help = "request events from the kernel",
  80         },
  81         {
  82                 .name = "settle",
  83                 .cmd = udevadm_settle,
  84                 .help = "wait for the event queue to finish",
  85         },
  86         {
  87                 .name = "control",
  88                 .cmd = udevadm_control,
  89                 .help = "control the udev daemon",
  90         },
  91         {
  92                 .name = "monitor",
  93                 .cmd = udevadm_monitor,
  94                 .help = "listen to kernel and udev events",
  95         },
  96         {
  97                 .name = "test",
  98                 .cmd = udevadm_test,
  99                 .help = "simulation run",
 100                 .debug = 1,
 101         },
 102         {
 103                 .name = "version",
 104                 .cmd = version,
 105         },
 106         {
 107                 .name = "help",
 108                 .cmd = help,
 109         },
 110         {}
 111 };
 112
 113 static int run_command(struct udev *udev, const struct command *cmd, int argc, char *argv[])
 114 {
 115         if (cmd->debug) {
 116                 debug = 1;
 117                 if (udev_get_log_priority(udev) < LOG_INFO)
 118                         udev_set_log_priority(udev, LOG_INFO);
 119         }
 120         info(udev, "calling: %s\n", cmd->name);
 121         return cmd->cmd(udev, argc, argv);
 122 }
 123
 124 int main(int argc, char *argv[])
 125 {
 126         struct udev *udev;
 127         static const struct option options[] = {
 128                 { "debug", no_argument, NULL, 'd' },
 129                 { "help", no_argument, NULL, 'h' },
 130                 { "version", no_argument, NULL, 'V' },
 131                 {}
 132         };
 133         const char *command;
 134         int i;
 135         int rc = 1;
 136
 137         udev = udev_new();
 138         if (udev == NULL)
 139                 goto out;
 140
 141         udev_log_init("udevadm");
 142         udev_set_log_fn(udev, log_fn);
 143         udev_selinux_init(udev);
 144
 145         while (1) {
 146                 int option;
 147
 148                 option = getopt_long(argc, argv, "+dhV", options, NULL);
 149                 if (option == -1)
 150                         break;
 151
 152                 switch (option) {
 153                 case 'd':
 154                         debug = 1;
 155                         if (udev_get_log_priority(udev) < LOG_INFO)
 156                                 udev_set_log_priority(udev, LOG_INFO);
 157                         break;
 158                 case 'h':
 159                         rc = help(udev, argc, argv);
 160                         goto out;
 161                 case 'V':
 162                         rc = version(udev, argc, argv);
 163                         goto out;
 164                 default:
 165                         goto out;
 166                 }
 167         }
 168         command = argv[optind];
 169
 170         if (command != NULL)
 171                 for (i = 0; cmds[i].cmd != NULL; i++) {
 172                         if (strcmp(cmds[i].name, command) == 0) {
 173                                 argc -= optind;
 174                                 argv += optind;
 175                                 optind = 0;
 176                                 rc = run_command(udev, &cmds[i], argc, argv);
 177                                 goto out;
 178                         }
 179                 }
 180
 181         fprintf(stderr, "missing or unknown command\n\n");
 182         help(udev, argc, argv);
 183         rc = 2;
 184 out:
 185         udev_selinux_exit(udev);
 186         udev_unref(udev);
 187         udev_log_close();
 188         return rc;
 189 }