udev/udevadm.c

   1 /*
   2  * Copyright (C) 2007-2008 Kay Sievers <kay.sievers@vrfy.org>
   3  *
   4  *      This program is free software; you can redistribute it and/or modify it
   5  *      under the terms of the GNU General Public License as published by the
   6  *      Free Software Foundation version 2 of the License.
   7  *
   8  *      This program is distributed in the hope that it will be useful, but
   9  *      WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  *      General Public License for more details.
  12  *
  13  *      You should have received a copy of the GNU General Public License along
  14  *      with this program; if not, write to the Free Software Foundation, Inc.,
  15  *      51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16  *
  17  */
  18
  19 #include "config.h"
  20
  21 #include <unistd.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stddef.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include <getopt.h>
  28
  29 #include "udev.h"
  30
  31 static int debug;
  32
  33 static void log_fn(struct udev *udev, int priority,
  34                    const char *file, int line, const char *fn,
  35                    const char *format, va_list args)
  36 {
  37         if (debug) {
  38                 fprintf(stderr, "%s: ", fn);
  39                 vfprintf(stderr, format, args);
  40         } else {
  41                 vsyslog(priority, format, args);
  42         }
  43 }
  44
  45 struct command {
  46         const char *name;
  47         int (*cmd)(struct udev *udev, int argc, char *argv[]);
  48         const char *help;
  49         int debug;
  50 };
  51
  52 static const struct command cmds[];
  53
  54 static int version(struct udev *udev, int argc, char *argv[])
  55 {
  56         printf("%s\n", VERSION);
  57         return 0;
  58 }
  59
  60 static int help(struct udev *udev, int argc, char *argv[])
  61 {
  62         const struct command *cmd;
  63
  64         printf("Usage: udevadm [--help] [--version] [--debug] COMMAND [COMMAND OPTIONS]\n");
  65         for (cmd = cmds; cmd->name != NULL; cmd++)
  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                 .help = "print the version number",
 107         },
 108         {
 109                 .name = "help",
 110                 .cmd = help,
 111                 .help = "print this help text",
 112         },
 113         {}
 114 };
 115
 116 static int run_command(struct udev *udev, const struct command *cmd, int argc, char *argv[])
 117 {
 118         if (cmd->debug) {
 119                 debug = 1;
 120                 if (udev_get_log_priority(udev) < LOG_INFO)
 121                         udev_set_log_priority(udev, LOG_INFO);
 122         }
 123         info(udev, "calling: %s\n", cmd->name);
 124         return cmd->cmd(udev, argc, argv);
 125 }
 126
 127 int main(int argc, char *argv[])
 128 {
 129         struct udev *udev;
 130         static const struct option options[] = {
 131                 { "debug", 0, NULL, 'd' },
 132                 { "help", 0, NULL, 'h' },
 133                 { "version", 0, NULL, 'V' },
 134                 {}
 135         };
 136         const char *command;
 137         int i;
 138         const char *pos;
 139         int rc = 1;
 140
 141         udev = udev_new();
 142         if (udev == NULL)
 143                 goto out;
 144
 145         logging_init("udevadm");
 146         udev_set_log_fn(udev, log_fn);
 147         sysfs_init();
 148
 149         /* see if we are a compat link, this will be removed in a future release */
 150         command = argv[0];
 151         pos = strrchr(command, '/');
 152         if (pos != NULL)
 153                 command = &pos[1];
 154
 155         /* the trailing part of the binary or link name is the command */
 156         if (strncmp(command, "udev", 4) == 0)
 157                 command = &command[4];
 158
 159         for (i = 0; cmds[i].cmd != NULL; i++) {
 160                 if (strcmp(cmds[i].name, command) == 0) {
 161                         char path[128];
 162                         char prog[512];
 163                         ssize_t len;
 164
 165                         snprintf(path, sizeof(path), "/proc/%lu/exe", (unsigned long) getppid());
 166                         len = readlink(path, prog, sizeof(prog));
 167                         if (len > 0) {
 168                                 prog[len] = '\0';
 169                                 fprintf(stderr, "the program '%s' called '%s', it should use 'udevadm %s <options>', "
 170                                        "this will stop working in a future release\n", prog, argv[0], command);
 171                                 info(udev, "the program '%s' called '%s', it should use 'udevadm %s <options>', "
 172                                      "this will stop working in a future release\n", prog, argv[0], command);
 173                         }
 174                         rc = run_command(udev, &cmds[i], argc, argv);
 175                         goto out;
 176                 }
 177         }
 178
 179         while (1) {
 180                 int option;
 181
 182                 option = getopt_long(argc, argv, "+dhV", options, NULL);
 183                 if (option == -1)
 184                         break;
 185
 186                 switch (option) {
 187                 case 'd':
 188                         debug = 1;
 189                         if (udev_get_log_priority(udev) < LOG_INFO)
 190                                 udev_set_log_priority(udev, LOG_INFO);
 191                         break;
 192                 case 'h':
 193                         rc = help(udev, argc, argv);
 194                         goto out;
 195                 case 'V':
 196                         rc = version(udev, argc, argv);
 197                         goto out;
 198                 default:
 199                         goto out;
 200                 }
 201         }
 202         command = argv[optind];
 203
 204         if (command != NULL)
 205                 for (i = 0; cmds[i].cmd != NULL; i++) {
 206                         if (strcmp(cmds[i].name, command) == 0) {
 207                                 optind++;
 208                                 rc = run_command(udev, &cmds[i], argc, argv);
 209                                 goto out;
 210                         }
 211                 }
 212
 213         fprintf(stderr, "unknown command, try udevadm help\n\n");
 214         rc = 2;
 215 out:
 216         sysfs_cleanup();
 217         udev_unref(udev);
 218         logging_close();
 219         return rc;
 220 }