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/*
* Ouroboros - Copyright (C) 2016
*
* A simple CBR generator
*
* Dimitri Staessens <dimitri.staessens@intec.ugent.be>
* Sander Vrijders <sander.vrijders@intec.ugent.be>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <ouroboros/dev.h>
#include <ouroboros/time_utils.h>
static void busy_wait_until(const struct timespec * deadline)
{
struct timespec now;
clock_gettime(CLOCK_REALTIME, &now);
while (now.tv_sec < deadline->tv_sec)
clock_gettime(CLOCK_REALTIME, &now);
while (now.tv_sec == deadline->tv_sec
&& now.tv_nsec < deadline->tv_nsec)
clock_gettime(CLOCK_REALTIME, &now);
}
int client_main(char * server,
int duration,
int size,
long rate,
bool flood,
bool sleep)
{
int fd = 0;
int result = 0;
bool stop = false;
char buf[size];
long seqnr = 0;
unsigned long gap = size * 8.0 * (BILLION / (double) rate);
struct timespec start;
struct timespec end;
struct timespec intv = {(gap / BILLION), gap % BILLION};
int ms;
printf("Client started, duration %d, rate %lu b/s, size %d B.\n",
duration, rate, size);
fd = flow_alloc(server, NULL, NULL);
if (fd < 0) {
printf("Failed to allocate flow.\n");
return -1;
}
result = flow_alloc_res(fd);
if (result < 0) {
printf("Flow allocation refused.\n");
flow_dealloc(fd);
return -1;
}
clock_gettime(CLOCK_REALTIME, &start);
if (!flood) {
while (!stop) {
clock_gettime(CLOCK_REALTIME, &end);
ts_add(&end, &intv, &end);
memcpy(buf, &seqnr, sizeof(seqnr));
if (flow_write(fd, buf, size) == -1) {
stop = true;
continue;
}
if (sleep)
nanosleep(&intv, NULL);
else
busy_wait_until(&end);
++seqnr;
if (ts_diff_us(&start, &end) / MILLION
>= (long) duration)
stop = true;
}
} else { /* flood */
while (!stop) {
clock_gettime(CLOCK_REALTIME, &end);
if (flow_write(fd, buf, size) == -1) {
stop = true;
continue;
}
++seqnr;
if (ts_diff_us(&start, &end) / MILLION
>= (long) duration)
stop = true;
}
}
clock_gettime(CLOCK_REALTIME, &end);
ms = ts_diff_ms(&start, &end);
printf("sent statistics: "
"%9ld SDUs, %12ld bytes in %9d ms, %4.4f Mb/s\n",
seqnr, seqnr * size, ms, (seqnr * size * 8.0)/(ms * 1000));
flow_dealloc(fd);
return 0;
}
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