udev/udevadm.c

   1 /*
   2  * Copyright (C) 2007 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 #ifdef USE_LOG
  34 void log_message(int priority, const char *format, ...)
  35 {
  36         va_list args;
  37
  38         if (priority > udev_log_priority)
  39                 return;
  40
  41         va_start(args, format);
  42         if (debug)
  43                 vprintf(format, args);
  44         else
  45                 vsyslog(priority, format, args);
  46         va_end(args);
  47 }
  48 #endif
  49
  50 struct command {
  51         const char *name;
  52         int (*cmd)(int argc, char *argv[]);
  53         const char *help;
  54         int debug;
  55 };
  56
  57 static const struct command cmds[];
  58
  59 static int version(int argc, char *argv[])
  60 {
  61         printf("%s\n", VERSION);
  62         return 0;
  63 }
  64
  65 static int help(int argc, char *argv[])
  66 {
  67         const struct command *cmd;
  68
  69         printf("Usage: udevadm COMMAND [OPTIONS]\n");
  70         for (cmd = cmds; cmd->name != NULL; cmd++)
  71                 printf("  %-12s %s\n", cmd->name, cmd->help);
  72         printf("\n");
  73         return 0;
  74 }
  75
  76 static const struct command cmds[] = {
  77         {
  78                 .name = "info",
  79                 .cmd = udevadm_info,
  80                 .help = "query sysfs or the udev database",
  81         },
  82         {
  83                 .name = "trigger",
  84                 .cmd = udevadm_trigger,
  85                 .help = "request events from the kernel",
  86         },
  87         {
  88                 .name = "settle",
  89                 .cmd = udevadm_settle, "",
  90                 .help = "wait for the event queue to finish",
  91         },
  92         {
  93                 .name = "control",
  94                 .cmd = udevadm_control,
  95                 .help = "control the udev daemon",
  96         },
  97         {
  98                 .name = "monitor",
  99                 .cmd = udevadm_monitor,
 100                 .help = "listen to kernel and udev events",
 101         },
 102         {
 103                 .name = "test",
 104                 .cmd = udevadm_test,
 105                 .help = "simulation run",
 106                 .debug = 1,
 107         },
 108         {
 109                 .name = "version",
 110                 .cmd = version,
 111                 .help = "print the version number",
 112         },
 113         {
 114                 .name = "help",
 115                 .cmd = help,
 116                 .help = "print this help text",
 117         },
 118         {}
 119 };
 120
 121 int main(int argc, char *argv[])
 122 {
 123         const char *command = argv[1];
 124         int i;
 125         const char *pos;
 126         int rc;
 127
 128         logging_init("udevadm");
 129         udev_config_init();
 130         sysfs_init();
 131
 132         /* find command */
 133         if (command != NULL)
 134                 for (i = 0; cmds[i].cmd != NULL; i++) {
 135                         if (strcmp(cmds[i].name, command) == 0) {
 136                                 debug = cmds[i].debug;
 137                                 rc = cmds[i].cmd(argc-1, &argv[1]);
 138                                 goto out;
 139                         }
 140                 }
 141
 142         /* try to find compat link, will be removed in a future release */
 143         command = argv[0];
 144         pos = strrchr(command, '/');
 145         if (pos != NULL)
 146                 command = &pos[1];
 147
 148         /* the trailing part of the binary or link name is the command */
 149         if (strncmp(command, "udev", 4) == 0)
 150                 command = &command[4];
 151
 152         for (i = 0; cmds[i].cmd != NULL; i++) {
 153                 if (strcmp(cmds[i].name, command) == 0) {
 154                         char path[128];
 155                         char prog[512];
 156                         ssize_t len;
 157
 158                         snprintf(path, sizeof(path), "/proc/%lu/exe", (unsigned long) getppid());
 159                         len = readlink(path, prog, sizeof(prog));
 160                         if (len > 0) {
 161                                 prog[len] = '\0';
 162                                 fprintf(stderr, "the program '%s' called '%s', it should use 'udevadm %s <options>', "
 163                                        "this will stop working in a future release\n", prog, argv[0], command);
 164                                 info("the program '%s' called '%s', it should use 'udevadm %s <options>', "
 165                                      "this will stop working in a future release\n", prog, argv[0], command);
 166                         }
 167                         debug = cmds[i].debug;
 168                         rc = cmds[i].cmd(argc, argv);
 169                         goto out;
 170                 }
 171         }
 172
 173         fprintf(stderr, "unknown command, try help\n\n");
 174         rc = 2;
 175 out:
 176         sysfs_cleanup();
 177         logging_close();
 178         return rc;
 179 }