src/udev/udevadm-control.c

   1 /*
   2  * Copyright (C) 2005-2011 Kay Sievers <kay@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 <errno.h>
  16 #include <getopt.h>
  17 #include <stddef.h>
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22
  23 #include "udev-util.h"
  24 #include "udev.h"
  25
  26 static void print_help(void) {
  27         printf("%s control COMMAND\n\n"
  28                "Control the udev daemon.\n\n"
  29                "  -h --help                Show this help\n"
  30                "     --version             Show package version\n"
  31                "  -e --exit                Instruct the daemon to cleanup and exit\n"
  32                "  -l --log-priority=LEVEL  Set the udev log level for the daemon\n"
  33                "  -s --stop-exec-queue     Do not execute events, queue only\n"
  34                "  -S --start-exec-queue    Execute events, flush queue\n"
  35                "  -R --reload              Reload rules and databases\n"
  36                "  -p --property=KEY=VALUE  Set a global property for all events\n"
  37                "  -m --children-max=N      Maximum number of children\n"
  38                "     --timeout=SECONDS     Maximum time to block for a reply\n"
  39                , program_invocation_short_name);
  40 }
  41
  42 static int adm_control(struct udev *udev, int argc, char *argv[]) {
  43         _cleanup_udev_ctrl_unref_ struct udev_ctrl *uctrl = NULL;
  44         int timeout = 60;
  45         int rc = 1, c;
  46
  47         static const struct option options[] = {
  48                 { "exit",             no_argument,       NULL, 'e' },
  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",           no_argument,       NULL, 'R' },
  53                 { "reload-rules",     no_argument,       NULL, 'R' }, /* alias for -R */
  54                 { "property",         required_argument, NULL, 'p' },
  55                 { "env",              required_argument, NULL, 'p' }, /* alias for -p */
  56                 { "children-max",     required_argument, NULL, 'm' },
  57                 { "timeout",          required_argument, NULL, 't' },
  58                 { "help",             no_argument,       NULL, 'h' },
  59                 {}
  60         };
  61
  62         if (getuid() != 0) {
  63                 fprintf(stderr, "root privileges required\n");
  64                 return 1;
  65         }
  66
  67         uctrl = udev_ctrl_new(udev);
  68         if (uctrl == NULL)
  69                 return 2;
  70
  71         while ((c = getopt_long(argc, argv, "el:sSRp:m:h", options, NULL)) >= 0)
  72                 switch (c) {
  73                 case 'e':
  74                         if (udev_ctrl_send_exit(uctrl, timeout) < 0)
  75                                 rc = 2;
  76                         else
  77                                 rc = 0;
  78                         break;
  79                 case 'l': {
  80                         int i;
  81
  82                         i = util_log_priority(optarg);
  83                         if (i < 0) {
  84                                 fprintf(stderr, "invalid number '%s'\n", optarg);
  85                                 return rc;
  86                         }
  87                         if (udev_ctrl_send_set_log_level(uctrl, util_log_priority(optarg), timeout) < 0)
  88                                 rc = 2;
  89                         else
  90                                 rc = 0;
  91                         break;
  92                 }
  93                 case 's':
  94                         if (udev_ctrl_send_stop_exec_queue(uctrl, timeout) < 0)
  95                                 rc = 2;
  96                         else
  97                                 rc = 0;
  98                         break;
  99                 case 'S':
 100                         if (udev_ctrl_send_start_exec_queue(uctrl, timeout) < 0)
 101                                 rc = 2;
 102                         else
 103                                 rc = 0;
 104                         break;
 105                 case 'R':
 106                         if (udev_ctrl_send_reload(uctrl, timeout) < 0)
 107                                 rc = 2;
 108                         else
 109                                 rc = 0;
 110                         break;
 111                 case 'p':
 112                         if (strchr(optarg, '=') == NULL) {
 113                                 fprintf(stderr, "expect <KEY>=<value> instead of '%s'\n", optarg);
 114                                 return rc;
 115                         }
 116                         if (udev_ctrl_send_set_env(uctrl, optarg, timeout) < 0)
 117                                 rc = 2;
 118                         else
 119                                 rc = 0;
 120                         break;
 121                 case 'm': {
 122                         char *endp;
 123                         int i;
 124
 125                         i = strtoul(optarg, &endp, 0);
 126                         if (endp[0] != '\0' || i < 1) {
 127                                 fprintf(stderr, "invalid number '%s'\n", optarg);
 128                                 return rc;
 129                         }
 130                         if (udev_ctrl_send_set_children_max(uctrl, i, timeout) < 0)
 131                                 rc = 2;
 132                         else
 133                                 rc = 0;
 134                         break;
 135                 }
 136                 case 't': {
 137                         int seconds;
 138
 139                         seconds = atoi(optarg);
 140                         if (seconds >= 0)
 141                                 timeout = seconds;
 142                         else
 143                                 fprintf(stderr, "invalid timeout value\n");
 144                         break;
 145                 }
 146                 case 'h':
 147                         print_help();
 148                         rc = 0;
 149                         break;
 150                 }
 151
 152         if (optind < argc)
 153                 fprintf(stderr, "Extraneous argument: %s\n", argv[optind]);
 154         else if (optind == 1)
 155                 fprintf(stderr, "Option missing\n");
 156         return rc;
 157 }
 158
 159 const struct udevadm_cmd udevadm_control = {
 160         .name = "control",
 161         .cmd = adm_control,
 162         .help = "Control the udev daemon",
 163 };