/usr/src/openvswitch-1.4.0/tests/test-timeval.c is in openvswitch-datapath-dkms 1.4.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 | /*
* 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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