src/udev/udevadm-control.c

   1 /*
   2  * Copyright (C) 2005-2011 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        do not execute events, queue only\n"
  36                 "  --start-exec-queue       execute events, flush queue\n"
  37                 "  --reload                 reload rules and databases\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", no_argument, NULL, 'R' },
  56                 { "reload-rules", no_argument, NULL, 'R' },
  57                 { "property", required_argument, NULL, 'p' },
  58                 { "env", required_argument, NULL, 'p' },
  59                 { "children-max", required_argument, NULL, 'm' },
  60                 { "timeout", required_argument, NULL, 't' },
  61                 { "help", no_argument, NULL, 'h' },
  62                 {}
  63         };
  64
  65         if (getuid() != 0) {
  66                 fprintf(stderr, "root privileges required\n");
  67                 return 1;
  68         }
  69
  70         uctrl = udev_ctrl_new(udev);
  71         if (uctrl == NULL)
  72                 return 2;
  73
  74         for (;;) {
  75                 int option;
  76
  77                 option = getopt_long(argc, argv, "el:sSRp:m:h", options, NULL);
  78                 if (option == -1)
  79                         break;
  80
  81                 switch (option) {
  82                 case 'e':
  83                         if (udev_ctrl_send_exit(uctrl, timeout) < 0)
  84                                 rc = 2;
  85                         else
  86                                 rc = 0;
  87                         break;
  88                 case 'l': {
  89                         int i;
  90
  91                         i = util_log_priority(optarg);
  92                         if (i < 0) {
  93                                 fprintf(stderr, "invalid number '%s'\n", optarg);
  94                                 goto out;
  95                         }
  96                         if (udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg), timeout) < 0)
  97                                 rc = 2;
  98                         else
  99                                 rc = 0;
 100                         break;
 101                 }
 102                 case 's':
 103                         if (udev_ctrl_send_stop_exec_queue(uctrl, timeout) < 0)
 104                                 rc = 2;
 105                         else
 106                                 rc = 0;
 107                         break;
 108                 case 'S':
 109                         if (udev_ctrl_send_start_exec_queue(uctrl, timeout) < 0)
 110                                 rc = 2;
 111                         else
 112                                 rc = 0;
 113                         break;
 114                 case 'R':
 115                         if (udev_ctrl_send_reload(uctrl, timeout) < 0)
 116                                 rc = 2;
 117                         else
 118                                 rc = 0;
 119                         break;
 120                 case 'p':
 121                         if (strchr(optarg, '=') == NULL) {
 122                                 fprintf(stderr, "expect <KEY>=<value> instead of '%s'\n", optarg);
 123                                 goto out;
 124                         }
 125                         if (udev_ctrl_send_set_env(uctrl, optarg, timeout) < 0)
 126                                 rc = 2;
 127                         else
 128                                 rc = 0;
 129                         break;
 130                 case 'm': {
 131                         char *endp;
 132                         int i;
 133
 134                         i = strtoul(optarg, &endp, 0);
 135                         if (endp[0] != '\0' || i < 1) {
 136                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 137                                 goto out;
 138                         }
 139                         if (udev_ctrl_send_set_children_max(uctrl, i, timeout) < 0)
 140                                 rc = 2;
 141                         else
 142                                 rc = 0;
 143                         break;
 144                 }
 145                 case 't': {
 146                         int seconds;
 147
 148                         seconds = atoi(optarg);
 149                         if (seconds >= 0)
 150                                 timeout = seconds;
 151                         else
 152                                 fprintf(stderr, "invalid timeout value\n");
 153                         break;
 154                 }
 155                 case 'h':
 156                         print_help();
 157                         rc = 0;
 158                         break;
 159                 }
 160         }
 161
 162         if (argv[optind] != NULL)
 163                 fprintf(stderr, "unknown option\n");
 164         else if (optind == 1)
 165                 fprintf(stderr, "missing option\n");
 166 out:
 167         udev_ctrl_unref(uctrl);
 168         return rc;
 169 }
 170
 171 const struct udevadm_cmd udevadm_control = {
 172         .name = "control",
 173         .cmd = adm_control,
 174         .help = "control the udev daemon",
 175 };