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                 va_list args2;
  39
  40                 va_copy(args2, args);
  41                 vfprintf(stderr, format, args2);
  42                 va_end(args2);
  43                 vsyslog(priority, format, args);
  44         }
  45 }
  46
  47 struct command {
  48         const char *name;
  49         int (*cmd)(struct udev *udev, int argc, char *argv[]);
  50         const char *help;
  51         int debug;
  52 };
  53
  54 static const struct command cmds[];
  55
  56 static int version(struct udev *udev, int argc, char *argv[])
  57 {
  58         printf("%s\n", VERSION);
  59         return 0;
  60 }
  61
  62 static int help(struct udev *udev, int argc, char *argv[])
  63 {
  64         const struct command *cmd;
  65
  66         printf("Usage: udevadm [--help] [--version] [--debug] COMMAND [COMMAND OPTIONS]\n");
  67         for (cmd = cmds; cmd->name != NULL; cmd++)
  68                 if (cmd->help != NULL)
  69                         printf("  %-12s %s\n", cmd->name, cmd->help);
  70         printf("\n");
  71         return 0;
  72 }
  73
  74 static const struct command cmds[] = {
  75         {
  76                 .name = "info",
  77                 .cmd = udevadm_info,
  78                 .help = "query sysfs or the udev database",
  79         },
  80         {
  81                 .name = "trigger",
  82                 .cmd = udevadm_trigger,
  83                 .help = "request events from the kernel",
  84         },
  85         {
  86                 .name = "settle",
  87                 .cmd = udevadm_settle,
  88                 .help = "wait for the event queue to finish",
  89         },
  90         {
  91                 .name = "control",
  92                 .cmd = udevadm_control,
  93                 .help = "control the udev daemon",
  94         },
  95         {
  96                 .name = "monitor",
  97                 .cmd = udevadm_monitor,
  98                 .help = "listen to kernel and udev events",
  99         },
 100         {
 101                 .name = "test",
 102                 .cmd = udevadm_test,
 103                 .help = "simulation run",
 104                 .debug = 1,
 105         },
 106         {
 107                 .name = "version",
 108                 .cmd = version,
 109         },
 110         {
 111                 .name = "help",
 112                 .cmd = help,
 113         },
 114         {}
 115 };
 116
 117 static int run_command(struct udev *udev, const struct command *cmd, int argc, char *argv[])
 118 {
 119         if (cmd->debug) {
 120                 debug = 1;
 121                 if (udev_get_log_priority(udev) < LOG_INFO)
 122                         udev_set_log_priority(udev, LOG_INFO);
 123         }
 124         info(udev, "calling: %s\n", cmd->name);
 125         return cmd->cmd(udev, argc, argv);
 126 }
 127
 128 int main(int argc, char *argv[])
 129 {
 130         struct udev *udev;
 131         static const struct option options[] = {
 132                 { "debug", no_argument, NULL, 'd' },
 133                 { "help", no_argument, NULL, 'h' },
 134                 { "version", no_argument, NULL, 'V' },
 135                 {}
 136         };
 137         const char *command;
 138         int i;
 139         int rc = 1;
 140
 141         udev = udev_new();
 142         if (udev == NULL)
 143                 goto out;
 144
 145         udev_log_init("udevadm");
 146         udev_set_log_fn(udev, log_fn);
 147         udev_selinux_init(udev);
 148
 149         for (;;) {
 150                 int option;
 151
 152                 option = getopt_long(argc, argv, "+dhV", options, NULL);
 153                 if (option == -1)
 154                         break;
 155
 156                 switch (option) {
 157                 case 'd':
 158                         debug = 1;
 159                         if (udev_get_log_priority(udev) < LOG_INFO)
 160                                 udev_set_log_priority(udev, LOG_INFO);
 161                         break;
 162                 case 'h':
 163                         rc = help(udev, argc, argv);
 164                         goto out;
 165                 case 'V':
 166                         rc = version(udev, argc, argv);
 167                         goto out;
 168                 default:
 169                         goto out;
 170                 }
 171         }
 172         command = argv[optind];
 173
 174         info(udev, "runtime dir '%s'\n", udev_get_run_path(udev));
 175
 176         if (command != NULL)
 177                 for (i = 0; cmds[i].cmd != NULL; i++) {
 178                         if (strcmp(cmds[i].name, command) == 0) {
 179                                 argc -= optind;
 180                                 argv += optind;
 181                                 optind = 0;
 182                                 rc = run_command(udev, &cmds[i], argc, argv);
 183                                 goto out;
 184                         }
 185                 }
 186
 187         fprintf(stderr, "missing or unknown command\n\n");
 188         help(udev, argc, argv);
 189         rc = 2;
 190 out:
 191         udev_selinux_exit(udev);
 192         udev_unref(udev);
 193         udev_log_close();
 194         return rc;
 195 }