mirror of
https://github.com/openvswitch/ovs
synced 2025-10-25 15:07:05 +00:00
40f0707cd9
When --monitor is used, administrators sometimes become confused about the presence of two copies of each process. This commit attempts to clarify the situation by making the monitoring process change its process name, as seen in /proc/$pid/cmdline and in "ps", to clearly indicate what is going on. CC: Dan Wendlandt <dan@nicira.com>
128 lines
3.3 KiB
C
128 lines
3.3 KiB
C
/*
|
|
* Copyright (c) 2009, 2010 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 <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;
|
|
|
|
assert(!gettimeofday(&tv, NULL));
|
|
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;
|
|
long long int start_gtod;
|
|
|
|
start_time_msec = time_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) {
|
|
assert(time_msec() - start_time_msec >= TIME_UPDATE_INTERVAL);
|
|
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]);
|
|
time_init();
|
|
|
|
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];
|
|
FILE *success;
|
|
|
|
assert(getcwd(cwd, sizeof cwd) == cwd);
|
|
|
|
unlink("test-timeval.success");
|
|
|
|
/* Daemonize, with a pidfile in the current directory. */
|
|
set_detach();
|
|
set_pidfile(xasprintf("%s/test-timeval.pid", cwd));
|
|
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;
|
|
}
|