-/*
- * Copyright (c) 2009, 2010, 2011 Nicira, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at:
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <config.h>
-
-#include "timeval.h"
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include "command-line.h"
-#include "daemon.h"
-#include "util.h"
-
-#undef NDEBUG
-#include <assert.h>
-
-static long long int
-gettimeofday_in_msec(void)
-{
- struct timeval tv;
-
- xgettimeofday(&tv);
- return timeval_to_msec(&tv);
-}
-
-static void
-do_test(void)
-{
- /* Wait until we are awakened by a signal (typically EINTR due to the
- * setitimer()). Then ensure that, if time has really advanced by
- * TIME_UPDATE_INTERVAL, then time_msec() reports that it advanced.
- */
- long long int start_time_msec, start_time_wall;
- long long int start_gtod;
-
- start_time_msec = time_msec();
- start_time_wall = time_wall_msec();
- start_gtod = gettimeofday_in_msec();
- for (;;) {
- /* Wait up to 1 second. Using select() to do the timeout avoids
- * interfering with the interval timer. */
- struct timeval timeout;
- int retval;
-
- timeout.tv_sec = 1;
- timeout.tv_usec = 0;
- retval = select(0, NULL, NULL, NULL, &timeout);
- if (retval != -1) {
- ovs_fatal(0, "select returned %d", retval);
- } else if (errno != EINTR) {
- ovs_fatal(errno, "select reported unexpected error");
- }
-
- if (gettimeofday_in_msec() - start_gtod >= TIME_UPDATE_INTERVAL) {
- /* gettimeofday() and time_msec() have different granularities in
- * their time sources. Depending on the rounding used this could
- * result in a slight difference, so we allow for 1 ms of slop. */
- assert(time_msec() - start_time_msec >= TIME_UPDATE_INTERVAL - 1);
- assert(time_wall_msec() - start_time_wall >=
- TIME_UPDATE_INTERVAL - 1);
- break;
- }
- }
-}
-
-static void
-usage(void)
-{
- ovs_fatal(0, "usage: %s TEST, where TEST is \"plain\" or \"daemon\"",
- program_name);
-}
-
-int
-main(int argc, char *argv[])
-{
- proctitle_init(argc, argv);
- set_program_name(argv[0]);
-
- if (argc != 2) {
- usage();
- } else if (!strcmp(argv[1], "plain")) {
- /* If we're not caching time there isn't much to test and SIGALRM won't
- * be around to pull us out of the select() call, so just skip out */
- if (!CACHE_TIME) {
- exit (77);
- }
-
- do_test();
- } else if (!strcmp(argv[1], "daemon")) {
- /* Test that time still advances even in a daemon. This is an
- * interesting test because fork() cancels the interval timer. */
- char cwd[1024], *pidfile;
- FILE *success;
-
- if (!CACHE_TIME) {
- exit (77);
- }
-
- assert(getcwd(cwd, sizeof cwd) == cwd);
-
- unlink("test-timeval.success");
-
- /* Daemonize, with a pidfile in the current directory. */
- set_detach();
- pidfile = xasprintf("%s/test-timeval.pid", cwd);
- set_pidfile(pidfile);
- free(pidfile);
- set_no_chdir();
- daemonize();
-
- /* Run the test. */
- do_test();
-
- /* Report success by writing out a file, since the ultimate invoker of
- * test-timeval can't wait on the daemonized process. */
- success = fopen("test-timeval.success", "w");
- if (!success) {
- ovs_fatal(errno, "test-timeval.success: create failed");
- }
- fprintf(success, "success\n");
- fclose(success);
- } else {
- usage();
- }
-
- return 0;
-}