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                 "  --log-priority=<level>   set the udev log level for the daemon\n"
  34                 "  --stop-exec-queue        keep udevd from executing events, queue only\n"
  35                 "  --start-exec-queue       execute events, flush queue\n"
  36                 "  --reload-rules           reloads the rules files\n"
  37                 "  --property=<KEY>=<value> set a global property for all events\n"
  38                 "  --children-max=<N>       maximum number of children\n"
  39                 "  --help                   print this help text\n\n");
  40 }
  41
  42 int udevadm_control(struct udev *udev, int argc, char *argv[])
  43 {
  44         struct udev_ctrl *uctrl = NULL;
  45         int rc = 1;
  46
  47         /* compat values with '_' will be removed in a future release */
  48         static const struct option options[] = {
  49                 { "log-priority", required_argument, NULL, 'l' },
  50                 { "stop-exec-queue", no_argument, NULL, 's' },
  51                 { "start-exec-queue", no_argument, NULL, 'S' },
  52                 { "reload-rules", no_argument, NULL, 'R' },
  53                 { "property", required_argument, NULL, 'p' },
  54                 { "env", required_argument, NULL, 'p' },
  55                 { "children-max", required_argument, NULL, 'm' },
  56                 { "help", no_argument, NULL, 'h' },
  57                 {}
  58         };
  59
  60         if (getuid() != 0) {
  61                 fprintf(stderr, "root privileges required\n");
  62                 return 1;
  63         }
  64
  65         uctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
  66         if (uctrl == NULL)
  67                 return 2;
  68
  69         for (;;) {
  70                 int option;
  71                 int i;
  72                 char *endp;
  73
  74                 option = getopt_long(argc, argv, "l:sSRp:m:h", options, NULL);
  75                 if (option == -1)
  76                         break;
  77
  78                 switch (option) {
  79                 case 'l':
  80                         i = util_log_priority(optarg);
  81                         if (i < 0) {
  82                                 fprintf(stderr, "invalid number '%s'\n", optarg);
  83                                 goto exit;
  84                         }
  85                         if (udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg)) < 0)
  86                                 rc = 2;
  87                         else
  88                                 rc = 0;
  89                         break;
  90                 case 's':
  91                         if (udev_ctrl_send_stop_exec_queue(uctrl) < 0)
  92                                 rc = 2;
  93                         else
  94                                 rc = 0;
  95                         break;
  96                 case 'S':
  97                         if (udev_ctrl_send_start_exec_queue(uctrl) < 0)
  98                                 rc = 2;
  99                         else
 100                                 rc = 0;
 101                         break;
 102                 case 'R':
 103                         if (udev_ctrl_send_reload_rules(uctrl) < 0)
 104                                 rc = 2;
 105                         else
 106                                 rc = 0;
 107                         break;
 108                 case 'p':
 109                         if (strchr(optarg, '=') == NULL) {
 110                                 fprintf(stderr, "expect <KEY>=<value> instead of '%s'\n", optarg);
 111                                 goto exit;
 112                         }
 113                         if (udev_ctrl_send_set_env(uctrl, optarg) < 0)
 114                                 rc = 2;
 115                         else
 116                                 rc = 0;
 117                         break;
 118                 case 'm':
 119                         i = strtoul(optarg, &endp, 0);
 120                         if (endp[0] != '\0' || i < 1) {
 121                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 122                                 goto exit;
 123                         }
 124                         if (udev_ctrl_send_set_children_max(uctrl, i) < 0)
 125                                 rc = 2;
 126                         else
 127                                 rc = 0;
 128                         break;
 129                 case 'h':
 130                         print_help();
 131                         rc = 0;
 132                         break;
 133                 }
 134         }
 135
 136         if (rc == 1)
 137                 err(udev, "unrecognized command\n");
 138 exit:
 139         udev_ctrl_unref(uctrl);
 140         return rc;
 141 }