udev/udevadm-control.c

   1 /*
   2  * Copyright (C) 2005-2008 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
  15 #include <time.h>
  16 #include <errno.h>
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <stddef.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <getopt.h>
  23 #include <sys/types.h>
  24 #include <sys/socket.h>
  25 #include <sys/wait.h>
  26 #include <sys/un.h>
  27
  28 #include "udev.h"
  29
  30 static void print_help(void)
  31 {
  32         printf("Usage: udevadm control COMMAND\n"
  33                 "  --exit                   instruct the daemon to cleanup and exit\n"
  34                 "  --log-priority=<level>   set the udev log level for the daemon\n"
  35                 "  --stop-exec-queue        keep udevd from executing events, queue only\n"
  36                 "  --start-exec-queue       execute events, flush queue\n"
  37                 "  --reload-rules           reloads the rules files\n"
  38                 "  --property=<KEY>=<value> set a global property for all events\n"
  39                 "  --children-max=<N>       maximum number of children\n"
  40                 "  --timeout=<seconds>      maximum time to block for a reply\n"
  41                 "  --help                   print this help text\n\n");
  42 }
  43
  44 static int adm_control(struct udev *udev, int argc, char *argv[])
  45 {
  46         struct udev_ctrl *uctrl = NULL;
  47         int timeout = 60;
  48         int rc = 1;
  49
  50         static const struct option options[] = {
  51                 { "exit", no_argument, NULL, 'e' },
  52                 { "log-priority", required_argument, NULL, 'l' },
  53                 { "stop-exec-queue", no_argument, NULL, 's' },
  54                 { "start-exec-queue", no_argument, NULL, 'S' },
  55                 { "reload-rules", no_argument, NULL, 'R' },
  56                 { "property", required_argument, NULL, 'p' },
  57                 { "env", required_argument, NULL, 'p' },
  58                 { "children-max", required_argument, NULL, 'm' },
  59                 { "timeout", required_argument, NULL, 't' },
  60                 { "help", no_argument, NULL, 'h' },
  61                 {}
  62         };
  63
  64         if (getuid() != 0) {
  65                 fprintf(stderr, "root privileges required\n");
  66                 return 1;
  67         }
  68
  69         uctrl = udev_ctrl_new(udev);
  70         if (uctrl == NULL)
  71                 return 2;
  72
  73         for (;;) {
  74                 int option;
  75
  76                 option = getopt_long(argc, argv, "el:sSRp:m:h", options, NULL);
  77                 if (option == -1)
  78                         break;
  79
  80                 switch (option) {
  81                 case 'e':
  82                         if (udev_ctrl_send_exit(uctrl, timeout) < 0)
  83                                 rc = 2;
  84                         else
  85                                 rc = 0;
  86                         break;
  87                 case 'l': {
  88                         int i;
  89
  90                         i = util_log_priority(optarg);
  91                         if (i < 0) {
  92                                 fprintf(stderr, "invalid number '%s'\n", optarg);
  93                                 goto out;
  94                         }
  95                         if (udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg), timeout) < 0)
  96                                 rc = 2;
  97                         else
  98                                 rc = 0;
  99                         break;
 100                 }
 101                 case 's':
 102                         if (udev_ctrl_send_stop_exec_queue(uctrl, timeout) < 0)
 103                                 rc = 2;
 104                         else
 105                                 rc = 0;
 106                         break;
 107                 case 'S':
 108                         if (udev_ctrl_send_start_exec_queue(uctrl, timeout) < 0)
 109                                 rc = 2;
 110                         else
 111                                 rc = 0;
 112                         break;
 113                 case 'R':
 114                         if (udev_ctrl_send_reload_rules(uctrl, timeout) < 0)
 115                                 rc = 2;
 116                         else
 117                                 rc = 0;
 118                         break;
 119                 case 'p':
 120                         if (strchr(optarg, '=') == NULL) {
 121                                 fprintf(stderr, "expect <KEY>=<value> instead of '%s'\n", optarg);
 122                                 goto out;
 123                         }
 124                         if (udev_ctrl_send_set_env(uctrl, optarg, timeout) < 0)
 125                                 rc = 2;
 126                         else
 127                                 rc = 0;
 128                         break;
 129                 case 'm': {
 130                         char *endp;
 131                         int i;
 132
 133                         i = strtoul(optarg, &endp, 0);
 134                         if (endp[0] != '\0' || i < 1) {
 135                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 136                                 goto out;
 137                         }
 138                         if (udev_ctrl_send_set_children_max(uctrl, i, timeout) < 0)
 139                                 rc = 2;
 140                         else
 141                                 rc = 0;
 142                         break;
 143                 }
 144                 case 't': {
 145                         int seconds;
 146
 147                         seconds = atoi(optarg);
 148                         if (seconds >= 0)
 149                                 timeout = seconds;
 150                         else
 151                                 fprintf(stderr, "invalid timeout value\n");
 152                         break;
 153                 }
 154                 case 'h':
 155                         print_help();
 156                         rc = 0;
 157                         break;
 158                 }
 159         }
 160
 161         if (argv[optind] != NULL)
 162                 fprintf(stderr, "unknown option\n");
 163         else if (optind == 1)
 164                 fprintf(stderr, "missing option\n");
 165 out:
 166         udev_ctrl_unref(uctrl);
 167         return rc;
 168 }
 169
 170 const struct udevadm_cmd udevadm_control = {
 171         .name = "control",
 172         .cmd = adm_control,
 173         .help = "control the udev daemon",
 174 };