/* * Ouroboros - Copyright (C) 2016 - 2017 * * A simple CBR generator * * Dimitri Staessens <dimitri.staessens@ugent.be> * Sander Vrijders <sander.vrijders@ugent.be> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * 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., http://www.fsf.org/about/contact/. */ #include <ouroboros/dev.h> #include <ouroboros/time_utils.h> #include <signal.h> volatile bool stop; static void shutdown_client(int signo, siginfo_t * info, void * c) { (void) info; (void) c; switch(signo) { case SIGINT: case SIGTERM: case SIGHUP: stop = true; default: return; } } 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) { struct sigaction sig_act; int fd = 0; char buf[size]; long seqnr = 0; long gap = size * 8.0 * (BILLION / (double) rate); struct timespec start; struct timespec end; struct timespec intv = {(gap / BILLION), gap % BILLION}; int ms; stop = false; memset(&sig_act, 0, sizeof sig_act); sig_act.sa_sigaction = &shutdown_client; sig_act.sa_flags = 0; if (sigaction(SIGINT, &sig_act, NULL) || sigaction(SIGTERM, &sig_act, NULL) || sigaction(SIGHUP, &sig_act, NULL) || sigaction(SIGPIPE, &sig_act, NULL)) { printf("Failed to install sighandler.\n"); return -1; } 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; } 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 >= duration) stop = true; } } else { /* flood */ while (!stop) { clock_gettime(CLOCK_REALTIME, &end); if (flow_write(fd, buf, (size_t) 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 / (ms * 1000.0)) * size * 8.0); flow_dealloc(fd); return 0; }