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/*
* Copyright (c) 2009, 2010, 2011 Nicira Networks.
*
* 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")) {
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;
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;
}
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