udev/udevadm-settle.c

   1 /*
   2  * Copyright (C) 2006-2008 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  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdlib.h>
  19 #include <stddef.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include <errno.h>
  24 #include <dirent.h>
  25 #include <fcntl.h>
  26 #include <syslog.h>
  27 #include <getopt.h>
  28 #include <sys/stat.h>
  29 #include <sys/types.h>
  30
  31 #include "udev.h"
  32
  33 #define DEFAULT_TIMEOUT                 180
  34 #define LOOP_PER_SECOND                 20
  35
  36 int udevadm_settle(struct udev *udev, int argc, char *argv[])
  37 {
  38         static const struct option options[] = {
  39                 { "seq-start", required_argument, NULL, 's' },
  40                 { "seq-end", required_argument, NULL, 'e' },
  41                 { "timeout", required_argument, NULL, 't' },
  42                 { "quiet", no_argument, NULL, 'q' },
  43                 { "help", no_argument, NULL, 'h' },
  44                 {}
  45         };
  46         unsigned long long start = 0;
  47         unsigned long long end = 0;
  48         int timeout = DEFAULT_TIMEOUT;
  49         int quiet = 0;
  50         struct udev_queue *udev_queue = NULL;
  51         int loop;
  52         int rc = 0;
  53
  54         dbg(udev, "version %s\n", VERSION);
  55
  56         while (1) {
  57                 int option;
  58                 int seconds;
  59
  60                 option = getopt_long(argc, argv, "s:e:t:qh", options, NULL);
  61                 if (option == -1)
  62                         break;
  63
  64                 switch (option) {
  65                 case 's':
  66                         start = strtoull(optarg, NULL, 0);
  67                         break;
  68                 case 'e':
  69                         end = strtoull(optarg, NULL, 0);
  70                         break;
  71                 case 't':
  72                         seconds = atoi(optarg);
  73                         if (seconds >= 0)
  74                                 timeout = seconds;
  75                         else
  76                                 fprintf(stderr, "invalid timeout value\n");
  77                         dbg(udev, "timeout=%i\n", timeout);
  78                         break;
  79                 case 'q':
  80                         quiet = 1;
  81                         break;
  82                 case 'h':
  83                         printf("Usage: udevadm settle [--help] [--timeout=<seconds>] [--quiet]\n\n");
  84                         goto exit;
  85                 }
  86         }
  87
  88         udev_queue = udev_queue_new(udev);
  89         if (udev_queue == NULL)
  90                 goto exit;
  91         loop = timeout * LOOP_PER_SECOND;
  92
  93         if (start > 0) {
  94                 unsigned long long kernel_seq;
  95
  96                 kernel_seq = udev_queue_get_kernel_seqnum(udev_queue);
  97
  98                 /* unless specified, the last event is the current kernel seqnum */
  99                 if (end == 0)
 100                         end = udev_queue_get_kernel_seqnum(udev_queue);
 101
 102                 if (start > end) {
 103                         err(udev, "seq-start larger than seq-end, ignoring\n");
 104                         fprintf(stderr, "seq-start larger than seq-end, ignoring\n");
 105                         start = 0;
 106                         end = 0;
 107                 }
 108
 109                 if (start > kernel_seq || end > kernel_seq) {
 110                         err(udev, "seq-start or seq-end larger than current kernel value, ignoring\n");
 111                         fprintf(stderr, "seq-start or seq-end larger than current kernel value, ignoring\n");
 112                         start = 0;
 113                         end = 0;
 114                 }
 115                 info(udev, "start=%llu end=%llu current=%llu\n", start, end, kernel_seq);
 116         } else {
 117                 if (end > 0) {
 118                         err(udev, "seq-end needs seq-start parameter, ignoring\n");
 119                         fprintf(stderr, "seq-end needs seq-start parameter, ignoring\n");
 120                         end = 0;
 121                 }
 122         }
 123
 124         while (loop--) {
 125                 /* exit if queue is empty */
 126                 if (udev_queue_get_queue_is_empty(udev_queue))
 127                         break;
 128
 129                 /* if asked for, wait for a specific sequence of events */
 130                 if (start > 0) {
 131                         unsigned long long seq;
 132                         int finished;
 133
 134                         finished = 0;
 135                         for (seq = start; seq <= end; seq++) {
 136                                 finished  = udev_queue_get_seqnum_is_finished(udev_queue, seq);
 137                                 if (!finished)
 138                                         break;
 139                         }
 140                         if (finished)
 141                                 break;
 142                 }
 143                 usleep(1000 * 1000 / LOOP_PER_SECOND);
 144         }
 145
 146         /* if we reached the timeout, print the list of remaining events */
 147         if (loop <= 0) {
 148                 struct udev_list_entry *list_entry;
 149
 150                 if (!quiet) {
 151                         info(udev, "timeout waiting for udev queue\n");
 152                         printf("\nudevadm settle - timeout of %i seconds reached, the event queue contains:\n", timeout);
 153                         udev_list_entry_foreach(list_entry, udev_queue_get_queued_list_entry(udev_queue))
 154                                 printf("  %s (%s)\n",
 155                                        udev_list_entry_get_name(list_entry),
 156                                        udev_list_entry_get_value(list_entry));
 157                 }
 158                 rc = 1;
 159         }
 160 exit:
 161         udev_queue_unref(udev_queue);
 162         return rc;
 163 }