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                 if (priority <= LOG_ERR)
  39                         vfprintf(stderr, format, args);
  40                 vsyslog(priority, format, args);
  41         }
  42 }
  43
  44 struct command {
  45         const char *name;
  46         int (*cmd)(struct udev *udev, int argc, char *argv[]);
  47         const char *help;
  48         int debug;
  49 };
  50
  51 static const struct command cmds[];
  52
  53 static int version(struct udev *udev, int argc, char *argv[])
  54 {
  55         printf("%s\n", VERSION);
  56         return 0;
  57 }
  58
  59 static int help(struct udev *udev, int argc, char *argv[])
  60 {
  61         const struct command *cmd;
  62
  63         printf("Usage: udevadm [--help] [--version] [--debug] COMMAND [COMMAND OPTIONS]\n");
  64         for (cmd = cmds; cmd->name != NULL; cmd++)
  65                 if (cmd->help != NULL)
  66                         printf("  %-12s %s\n", cmd->name, cmd->help);
  67         printf("\n");
  68         return 0;
  69 }
  70
  71 static const struct command cmds[] = {
  72         {
  73                 .name = "info",
  74                 .cmd = udevadm_info,
  75                 .help = "query sysfs or the udev database",
  76         },
  77         {
  78                 .name = "trigger",
  79                 .cmd = udevadm_trigger,
  80                 .help = "request events from the kernel",
  81         },
  82         {
  83                 .name = "settle",
  84                 .cmd = udevadm_settle,
  85                 .help = "wait for the event queue to finish",
  86         },
  87         {
  88                 .name = "control",
  89                 .cmd = udevadm_control,
  90                 .help = "control the udev daemon",
  91         },
  92         {
  93                 .name = "monitor",
  94                 .cmd = udevadm_monitor,
  95                 .help = "listen to kernel and udev events",
  96         },
  97         {
  98                 .name = "test",
  99                 .cmd = udevadm_test,
 100                 .help = "simulation run",
 101                 .debug = 1,
 102         },
 103         {
 104                 .name = "version",
 105                 .cmd = version,
 106         },
 107         {
 108                 .name = "help",
 109                 .cmd = help,
 110         },
 111         {}
 112 };
 113
 114 static int run_command(struct udev *udev, const struct command *cmd, int argc, char *argv[])
 115 {
 116         if (cmd->debug) {
 117                 debug = 1;
 118                 if (udev_get_log_priority(udev) < LOG_INFO)
 119                         udev_set_log_priority(udev, LOG_INFO);
 120         }
 121         info(udev, "calling: %s\n", cmd->name);
 122         return cmd->cmd(udev, argc, argv);
 123 }
 124
 125 int main(int argc, char *argv[])
 126 {
 127         struct udev *udev;
 128         static const struct option options[] = {
 129                 { "debug", no_argument, NULL, 'd' },
 130                 { "help", no_argument, NULL, 'h' },
 131                 { "version", no_argument, NULL, 'V' },
 132                 {}
 133         };
 134         const char *command;
 135         int i;
 136         int rc = 1;
 137
 138         udev = udev_new();
 139         if (udev == NULL)
 140                 goto out;
 141
 142         udev_log_init("udevadm");
 143         udev_set_log_fn(udev, log_fn);
 144         udev_selinux_init(udev);
 145
 146         while (1) {
 147                 int option;
 148
 149                 option = getopt_long(argc, argv, "+dhV", options, NULL);
 150                 if (option == -1)
 151                         break;
 152
 153                 switch (option) {
 154                 case 'd':
 155                         debug = 1;
 156                         if (udev_get_log_priority(udev) < LOG_INFO)
 157                                 udev_set_log_priority(udev, LOG_INFO);
 158                         break;
 159                 case 'h':
 160                         rc = help(udev, argc, argv);
 161                         goto out;
 162                 case 'V':
 163                         rc = version(udev, argc, argv);
 164                         goto out;
 165                 default:
 166                         goto out;
 167                 }
 168         }
 169         command = argv[optind];
 170
 171         if (command != NULL)
 172                 for (i = 0; cmds[i].cmd != NULL; i++) {
 173                         if (strcmp(cmds[i].name, command) == 0) {
 174                                 argc -= optind;
 175                                 argv += optind;
 176                                 optind = 0;
 177                                 rc = run_command(udev, &cmds[i], argc, argv);
 178                                 goto out;
 179                         }
 180                 }
 181
 182         fprintf(stderr, "missing or unknown command\n\n");
 183         help(udev, argc, argv);
 184         rc = 2;
 185 out:
 186         udev_selinux_exit(udev);
 187         udev_unref(udev);
 188         udev_log_close();
 189         return rc;
 190 }