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         static const struct option options[] = {
  48                 { "log-priority", required_argument, NULL, 'l' },
  49                 { "stop-exec-queue", no_argument, NULL, 's' },
  50                 { "start-exec-queue", no_argument, NULL, 'S' },
  51                 { "reload-rules", no_argument, NULL, 'R' },
  52                 { "property", required_argument, NULL, 'p' },
  53                 { "env", required_argument, NULL, 'p' },
  54                 { "children-max", required_argument, NULL, 'm' },
  55                 { "help", no_argument, NULL, 'h' },
  56                 {}
  57         };
  58
  59         if (getuid() != 0) {
  60                 fprintf(stderr, "root privileges required\n");
  61                 return 1;
  62         }
  63
  64         uctrl = udev_ctrl_new_from_socket(udev, UDEV_CTRL_SOCK_PATH);
  65         if (uctrl == NULL)
  66                 return 2;
  67
  68         for (;;) {
  69                 int option;
  70                 int i;
  71                 char *endp;
  72
  73                 option = getopt_long(argc, argv, "l:sSRp:m:h", options, NULL);
  74                 if (option == -1)
  75                         break;
  76
  77                 switch (option) {
  78                 case 'l':
  79                         i = util_log_priority(optarg);
  80                         if (i < 0) {
  81                                 fprintf(stderr, "invalid number '%s'\n", optarg);
  82                                 goto exit;
  83                         }
  84                         if (udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg)) < 0)
  85                                 rc = 2;
  86                         else
  87                                 rc = 0;
  88                         break;
  89                 case 's':
  90                         if (udev_ctrl_send_stop_exec_queue(uctrl) < 0)
  91                                 rc = 2;
  92                         else
  93                                 rc = 0;
  94                         break;
  95                 case 'S':
  96                         if (udev_ctrl_send_start_exec_queue(uctrl) < 0)
  97                                 rc = 2;
  98                         else
  99                                 rc = 0;
 100                         break;
 101                 case 'R':
 102                         if (udev_ctrl_send_reload_rules(uctrl) < 0)
 103                                 rc = 2;
 104                         else
 105                                 rc = 0;
 106                         break;
 107                 case 'p':
 108                         if (strchr(optarg, '=') == NULL) {
 109                                 fprintf(stderr, "expect <KEY>=<value> instead of '%s'\n", optarg);
 110                                 goto exit;
 111                         }
 112                         if (udev_ctrl_send_set_env(uctrl, optarg) < 0)
 113                                 rc = 2;
 114                         else
 115                                 rc = 0;
 116                         break;
 117                 case 'm':
 118                         i = strtoul(optarg, &endp, 0);
 119                         if (endp[0] != '\0' || i < 1) {
 120                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 121                                 goto exit;
 122                         }
 123                         if (udev_ctrl_send_set_children_max(uctrl, i) < 0)
 124                                 rc = 2;
 125                         else
 126                                 rc = 0;
 127                         break;
 128                 case 'h':
 129                         print_help();
 130                         rc = 0;
 131                         break;
 132                 }
 133         }
 134
 135         if (rc == 1)
 136                 err(udev, "unrecognized command\n");
 137 exit:
 138         udev_ctrl_unref(uctrl);
 139         return rc;
 140 }