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