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                 if (cmd->help != NULL)
  67                         printf("  %-12s %s\n", cmd->name, cmd->help);
  68         printf("\n");
  69         return 0;
  70 }
  71
  72 static const struct command cmds[] = {
  73         {
  74                 .name = "info",
  75                 .cmd = udevadm_info,
  76                 .help = "query sysfs or the udev database",
  77         },
  78         {
  79                 .name = "trigger",
  80                 .cmd = udevadm_trigger,
  81                 .help = "request events from the kernel",
  82         },
  83         {
  84                 .name = "settle",
  85                 .cmd = udevadm_settle, "",
  86                 .help = "wait for the event queue to finish",
  87         },
  88         {
  89                 .name = "control",
  90                 .cmd = udevadm_control,
  91                 .help = "control the udev daemon",
  92         },
  93         {
  94                 .name = "monitor",
  95                 .cmd = udevadm_monitor,
  96                 .help = "listen to kernel and udev events",
  97         },
  98         {
  99                 .name = "test",
 100                 .cmd = udevadm_test,
 101                 .help = "simulation run",
 102                 .debug = 1,
 103         },
 104         {
 105                 .name = "version",
 106                 .cmd = version,
 107         },
 108         {
 109                 .name = "help",
 110                 .cmd = help,
 111         },
 112         {}
 113 };
 114
 115 static int run_command(struct udev *udev, const struct command *cmd, int argc, char *argv[])
 116 {
 117         if (cmd->debug) {
 118                 debug = 1;
 119                 if (udev_get_log_priority(udev) < LOG_INFO)
 120                         udev_set_log_priority(udev, LOG_INFO);
 121         }
 122         info(udev, "calling: %s\n", cmd->name);
 123         return cmd->cmd(udev, argc, argv);
 124 }
 125
 126 int main(int argc, char *argv[])
 127 {
 128         struct udev *udev;
 129         static const struct option options[] = {
 130                 { "debug", 0, NULL, 'd' },
 131                 { "help", 0, NULL, 'h' },
 132                 { "version", 0, NULL, 'V' },
 133                 {}
 134         };
 135         const char *command;
 136         int i;
 137         const char *pos;
 138         int rc = 1;
 139
 140         udev = udev_new();
 141         if (udev == NULL)
 142                 goto out;
 143
 144         logging_init("udevadm");
 145         udev_set_log_fn(udev, log_fn);
 146         sysfs_init();
 147
 148         /* see if we are a compat link, this will be removed in a future release */
 149         command = argv[0];
 150         pos = strrchr(command, '/');
 151         if (pos != NULL)
 152                 command = &pos[1];
 153
 154         /* the trailing part of the binary or link name is the command */
 155         if (strncmp(command, "udev", 4) == 0)
 156                 command = &command[4];
 157
 158         for (i = 0; cmds[i].cmd != NULL; i++) {
 159                 if (strcmp(cmds[i].name, command) == 0) {
 160                         char path[128];
 161                         char prog[512];
 162                         ssize_t len;
 163
 164                         snprintf(path, sizeof(path), "/proc/%lu/exe", (unsigned long) getppid());
 165                         len = readlink(path, prog, sizeof(prog));
 166                         if (len > 0) {
 167                                 prog[len] = '\0';
 168                                 fprintf(stderr, "the program '%s' called '%s', it should use 'udevadm %s <options>', "
 169                                        "this will stop working in a future release\n", prog, argv[0], command);
 170                                 err(udev, "the program '%s' called '%s', it should use 'udevadm %s <options>', "
 171                                     "this will stop working in a future release\n", prog, argv[0], command);
 172                         }
 173                         rc = run_command(udev, &cmds[i], argc, argv);
 174                         goto out;
 175                 }
 176         }
 177
 178         while (1) {
 179                 int option;
 180
 181                 option = getopt_long(argc, argv, "+dhV", options, NULL);
 182                 if (option == -1)
 183                         break;
 184
 185                 switch (option) {
 186                 case 'd':
 187                         debug = 1;
 188                         if (udev_get_log_priority(udev) < LOG_INFO)
 189                                 udev_set_log_priority(udev, LOG_INFO);
 190                         break;
 191                 case 'h':
 192                         rc = help(udev, argc, argv);
 193                         goto out;
 194                 case 'V':
 195                         rc = version(udev, argc, argv);
 196                         goto out;
 197                 default:
 198                         goto out;
 199                 }
 200         }
 201         command = argv[optind];
 202
 203         if (command != NULL)
 204                 for (i = 0; cmds[i].cmd != NULL; i++) {
 205                         if (strcmp(cmds[i].name, command) == 0) {
 206                                 optind++;
 207                                 rc = run_command(udev, &cmds[i], argc, argv);
 208                                 goto out;
 209                         }
 210                 }
 211
 212         fprintf(stderr, "missing or unknown command\n\n");
 213         help(udev, argc, argv);
 214         rc = 2;
 215 out:
 216         sysfs_cleanup();
 217         udev_unref(udev);
 218         logging_close();
 219         return rc;
 220 }