1 /**************************************************************************/
2 /* CAN latency tester */
3 /* Copyright (C) 2010, 2011 Michal Sojka, DCE FEE CTU Prague */
5 /**************************************************************************/
16 #include <semaphore.h>
24 #include <sys/ioctl.h>
26 #include <sys/socket.h>
29 #include <sys/types.h>
33 #include <linux/can.h>
34 #include <linux/can/raw.h>
36 #include "histogram.h"
41 #define dbg(level, fmt, arg...) do {} while (0)
43 #define dbg(level, fmt, arg...) do { if (level <= DEBUG) { printf("candping: " fmt, ## arg); } } while (0)
46 #define INTERRUPTED_SYSCALL(errno) (errno == EINTR || errno == ERESTART)
48 #define MEMSET_ZERO(obj) memset(&(obj), 0, sizeof(obj))
50 /* Global variables */
51 volatile sig_atomic_t finish_flag = 0; /* Threads should terminate. */
52 sem_t finish_sem; /* Thread signals a termination */
54 /* Command line options */
67 /* Temporary variables */
73 struct options opt = {
84 struct timespec tic, tac;
86 unsigned invalid_frame;
89 int num_interfaces = 0;
90 int count = 0; /* Number of sent messages */
91 unsigned msg_in_progress = 0;
92 int completion_pipe[2];
97 struct timespec ts_sent, ts_sent_kern;
98 struct timespec ts_rx_onwire, ts_rx_onwire_kern;
99 struct timespec ts_rx_final, ts_rx_final_kern;
100 struct can_frame sent, received;
103 #define MAX_INFOS 10000
104 struct msg_info msg_infos[MAX_INFOS];
106 struct histogram histogram;
108 void sprint_canframe(char *buf , struct can_frame *cf, int sep) {
109 /* documentation see lib.h */
112 int dlc = (cf->can_dlc > 8)? 8 : cf->can_dlc;
114 if (cf->can_id & CAN_ERR_FLAG) {
115 sprintf(buf, "%08X#", cf->can_id & (CAN_ERR_MASK|CAN_ERR_FLAG));
117 } else if (cf->can_id & CAN_EFF_FLAG) {
118 sprintf(buf, "%08X#", cf->can_id & CAN_EFF_MASK);
121 sprintf(buf, "%03X#", cf->can_id & CAN_SFF_MASK);
125 if (cf->can_id & CAN_RTR_FLAG) /* there are no ERR frames with RTR */
126 sprintf(buf+offset, "R");
128 for (i = 0; i < dlc; i++) {
129 sprintf(buf+offset, "%02X", cf->data[i]);
131 if (sep && (i+1 < dlc))
132 sprintf(buf+offset++, ".");
136 static inline uint16_t frame_index(struct can_frame *frame)
139 if (frame->can_dlc >= 2) {
140 memcpy(&idx, frame->data, sizeof(idx));
141 if (idx >= MAX_INFOS)
142 error(1, 0, "%s idx too high", __FUNCTION__);
145 error(1, 0, "%s error", __FUNCTION__);
150 static inline struct msg_info *frame2info(struct can_frame *frame)
152 return &msg_infos[frame_index(frame)];
155 static inline char *tstamp_str(const void *ctx, struct timespec *tstamp)
157 return talloc_asprintf(ctx, "%ld.%06ld",
158 tstamp->tv_sec, tstamp->tv_nsec/1000);
161 /* Functions and types for CRC checks.
163 * Generated on Wed Sep 21 22:30:11 2011,
164 * by pycrc v0.7.8, http://www.tty1.net/pycrc/
165 * using the configuration:
172 * Algorithm = table-driven
173 *****************************************************************************/
174 typedef uint16_t crc_t;
176 static const crc_t crc_table[2] = {
180 crc_t crc_update(crc_t crc, uint32_t data, size_t bit_len)
182 unsigned int tbl_idx;
183 /* crc_t bc = crc; */
184 /* uint32_t bd = data; */
185 /* size_t bl = bit_len; */
188 tbl_idx = (crc >> 14) ^ (data >> 31);
189 crc = crc_table[tbl_idx & 0x01] ^ (crc << 1);
193 /* printf("crc: 0x%04x -> 0x%04x data: 0x%08x len: %d\n", */
194 /* bc, crc, bd, bl); */
198 unsigned calc_stuff_bits(struct can_frame *frame) {
200 unsigned start = 0, end;
201 uint32_t mask, ones = 0, basemask = 0xf8000000;
202 unsigned stuffed = 0;
203 memset(bitmap, 0, sizeof(bitmap));
207 if (frame->can_id & CAN_EFF_FLAG) {
209 ((frame->can_id & CAN_EFF_MASK) >> 25);
211 ((frame->can_id & CAN_EFF_MASK) >> 18) << 25 |
213 ((frame->can_id & CAN_EFF_MASK) & 0x3ffff) << 7 |
214 (!!(frame->can_id & CAN_RTR_FLAG)) << 6 |
216 frame->can_dlc & 0xf;
217 bitmap[2] = htonl(((uint32_t*)frame->data)[0]);
218 bitmap[3] = htonl(((uint32_t*)frame->data)[1]);
220 end = 64 + 8*frame->can_dlc;
221 crc = crc_update(crc, bitmap[0] << start, 32-start);
222 crc = crc_update(crc, bitmap[1], 32);
223 crc = crc_update(crc, bitmap[2], end - 64 > 32 ? 32 : end - 64);
224 crc = crc_update(crc, bitmap[3], end > 96 ? end - 96 : 0);
225 crcx = (uint32_t)htons(crc) << 17;
226 if (frame->can_dlc < 4)
227 bitmap[2] |= crcx >> (frame->can_dlc*8);
228 if (frame->can_dlc = 3)
229 bitmap[3] |= crcx << 8;
230 if (frame->can_dlc >= 4)
231 bitmap[3] |= crcx >> (frame->can_dlc*8);
234 (frame->can_id << 7) |
235 (!!(frame->can_id & CAN_RTR_FLAG)) << 6 |
237 frame->can_dlc & 0xf;
238 bitmap[1] = htonl(((uint32_t*)frame->data)[0]);
239 bitmap[2] = htonl(((uint32_t*)frame->data)[1]);
241 end = 32 + 8*frame->can_dlc;
243 /* TODO: Calc stuff bits in CRC */
244 while (start < end) {
245 mask = basemask >> (start & 0x1f);
247 ones = ones ? mask : 0;
248 uint32_t chunk = (bitmap[start >> 5] & mask) ^ ones;
249 //printf("start=%d bitmap=0x%08x mask=0x%08x ones=0x%08x chunk=0x%08x\n", start, bitmap[start >> 5], mask, ones, chunk);
251 unsigned change = __builtin_clz(chunk);
252 start = start & ~0x1f | change;
253 basemask = 0xf8000000;
255 unsigned oldstart = start;
256 start += __builtin_popcount(mask);
257 mask = (oldstart & 0x1f) ? basemask << (-oldstart & 0x1f) : 0;
258 //printf("oldstart=%d shl=%d mask=0x%08x\n", oldstart, -oldstart & 0x1f, mask);
259 if (mask && start < end)
261 if (start <= end && !mask) {
263 basemask = 0xf0000000;
264 //printf("stuffed %d\n", !ones);
271 //printf ("STUFFED %d BITS\n", stuffed);
274 unsigned calc_frame_txtime(struct can_frame *frame) {
275 return calc_stuff_bits(frame) +
278 ((frame->can_id & CAN_EFF_FLAG) ?
290 3 + /* CRC del, ACK, ACK del */
294 void msg_info_print(FILE *f, struct msg_info *mi)
296 struct timespec diff;
297 void *local = talloc_new (NULL);
299 char sent[64], received[64];
301 sprint_canframe(sent, &mi->sent, true);
302 sprint_canframe(received, &mi->received, true);
304 #define S(ts) tstamp_str(local, &ts)
305 #define DIFF(a, b) (timespec_subtract(&diff, &b, &a), S(diff))
307 switch (num_interfaces) {
309 fprintf(f, "%ld: %s %s -> %s (%s) %s = %s (%s) %d\n",
310 num, S(mi->ts_sent), sent, S(mi->ts_rx_final_kern), S(mi->ts_rx_final), received,
311 DIFF(mi->ts_sent, mi->ts_rx_final_kern),
312 DIFF(mi->ts_sent, mi->ts_rx_final),
313 calc_frame_txtime(&mi->received));
316 fprintf(f, "%ld: %s %s -> %s (%s) -> %s (%s) %s = %s (%s), %s (%s) %d\n",
317 num, S(mi->ts_sent), sent,
318 S(mi->ts_rx_onwire_kern), S(mi->ts_rx_onwire),
319 S(mi->ts_rx_final_kern), S(mi->ts_rx_final), received,
320 DIFF(mi->ts_sent, mi->ts_rx_onwire_kern),
321 DIFF(mi->ts_sent, mi->ts_rx_onwire),
322 DIFF(mi->ts_rx_onwire_kern, mi->ts_rx_final_kern),
323 DIFF(mi->ts_rx_onwire, mi->ts_rx_final),
324 calc_frame_txtime(&mi->received));
333 /* Subtract the `struct timespec' values X and Y, storing the result in
334 RESULT. Return 1 if the difference is negative, otherwise 0. */
336 int timespec_subtract (struct timespec *result, struct timespec *x, struct timespec *yy)
338 struct timespec ylocal = *yy, *y = &ylocal;
339 /* Perform the carry for the later subtraction by updating Y. */
340 if (x->tv_nsec < y->tv_nsec) {
341 int nsec = (y->tv_nsec - x->tv_nsec) / 1000000000 + 1;
342 y->tv_nsec -= 1000000000 * nsec;
345 if (x->tv_nsec - y->tv_nsec > 1000000000) {
346 int nsec = (x->tv_nsec - y->tv_nsec) / 1000000000;
347 y->tv_nsec += 1000000000 * nsec;
351 /* Compute the time remaining to wait.
352 `tv_nsec' is certainly positive. */
353 result->tv_sec = x->tv_sec - y->tv_sec;
354 result->tv_nsec = x->tv_nsec - y->tv_nsec;
356 /* Return 1 if result is negative. */
357 return x->tv_sec < y->tv_sec;
360 void dbg_print_timespec(char *msg, struct timespec *tv)
363 printf("%s sec=%ld nsec=%ld\n", msg, tv->tv_sec, tv->tv_nsec);
366 static inline unsigned get_msg_latency_us(struct msg_info *mi)
368 struct timespec diff;
369 switch (num_interfaces) {
372 timespec_subtract(&diff, &mi->ts_rx_final, &mi->ts_rx_onwire);
374 timespec_subtract(&diff, &mi->ts_rx_final_kern, &mi->ts_rx_onwire_kern);
378 timespec_subtract(&diff, &mi->ts_rx_final, &mi->ts_sent);
380 timespec_subtract(&diff, &mi->ts_rx_final_kern, &mi->ts_sent);
385 return diff.tv_sec * 1000000 + diff.tv_nsec/1000;
388 void set_sched_policy_and_prio(int policy, int rtprio)
390 struct sched_param scheduling_parameters;
391 int maxprio=sched_get_priority_max(policy);
392 int minprio=sched_get_priority_min(policy);
394 if((rtprio < minprio) || (rtprio > maxprio))
395 error(1, 0, "The priority for requested policy is out of <%d, %d> range\n",
398 scheduling_parameters.sched_priority = rtprio;
400 if (0 != pthread_setschedparam(pthread_self(), policy, &scheduling_parameters))
401 error(1, errno, "pthread_setschedparam error");
404 void term_handler(int signum)
409 static inline int sock_get_if_index(int s, const char *if_name)
414 strcpy(ifr.ifr_name, if_name);
415 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0)
416 error(1, errno, "SIOCGIFINDEX '%s'", if_name);
417 return ifr.ifr_ifindex;
420 static inline get_tstamp(struct timespec *ts)
422 clock_gettime(CLOCK_REALTIME, ts);
436 debugfs = "/sys/kernel/debug";
438 strcpy(path, debugfs);
439 strcat(path,"/tracing/tracing_on");
440 trace_fd = open(path, O_WRONLY);
442 write(trace_fd, "1", 1);
444 strcpy(path, debugfs);
445 strcat(path,"/tracing/trace_marker");
446 marker_fd = open(path, O_WRONLY);
448 strcpy(path, debugfs);
449 strcat(path,"/tracing/set_ftrace_pid");
450 f = fopen(path, "w");
451 fprintf(f, "%d\n", getpid());
453 system("echo function_graph > /sys/kernel/debug/tracing/current_tracer");
454 system("echo can_send > /sys/kernel/debug/tracing/set_graph_function");
455 system("echo > /sys/kernel/debug/tracing/trace");
456 system("echo 1 > /sys/kernel/debug/tracing/tracing_enabled");
461 static inline void trace_on()
464 write(trace_fd, "1", 1);
467 static inline void trace_off(int ret)
469 if (marker_fd >= 0) {
471 sprintf(marker, "write returned %d\n", ret);
472 write(marker_fd, marker, strlen(marker));
475 write(trace_fd, "0", 1);
478 static inline void msg_info_free(struct msg_info *mi)
483 static inline bool msg_info_used(struct msg_info *mi)
488 int send_frame(int socket)
490 struct can_frame frame;
493 static int curr_msg = -1;
499 while (msg_info_used(&msg_infos[i]) && i != curr_msg) {
505 error(1, 0, "Msg info table is full! Probably, many packets were lost.");
509 frame.can_id = opt.id;
511 error(1, 0, "Length < 2 is not yet supported");
512 frame.can_dlc = opt.length;
514 memcpy(frame.data, &idx, sizeof(idx));
515 mi = frame2info(&frame);
517 mi->id = frame.can_id;
518 mi->length = frame.can_dlc;
519 get_tstamp(&mi->ts_sent);
523 ret = write(socket, &frame, sizeof(frame));
526 if (ret == -1 || num_interfaces == 1)
531 static inline send_and_check(int s)
535 if (ret != sizeof(struct can_frame)) {
536 /* if (ret == -1 && errno == ENOBUFS && opt.period_us == 0 && !opt.oneattime) { */
537 /* stats.enobufs++; */
538 /* /\* Ignore this error - pfifo_fast qeuue is full *\/ */
540 error(1, errno, "send_frame (line %d)", __LINE__);
547 static inline void get_next_timeout(struct timespec *timeout)
550 static struct timespec last = {-1, 0 };
552 clock_gettime(CLOCK_MONOTONIC, &now);
554 if (last.tv_sec == -1)
556 if (opt.period_us != 0) {
557 last.tv_sec += opt.period_us/1000000;
558 last.tv_nsec += (opt.period_us%1000000)*1000;
559 while (last.tv_nsec >= 1000000000) {
560 last.tv_nsec -= 1000000000;
563 if (timespec_subtract(timeout, &last, &now) /* is negative */) {
565 memset(timeout, 0, sizeof(*timeout));
567 } else if (opt.timeout_ms != 0) {
568 timeout->tv_sec = opt.timeout_ms/1000;
569 timeout->tv_nsec = (opt.timeout_ms%1000)*1000000;
571 error(1, 0, "Timeout and period cannot be both zero");
574 void receive(int s, struct can_frame *frame, struct timespec *ts_kern, struct timespec *ts_user)
576 char ctrlmsg[CMSG_SPACE(sizeof(struct timeval)) + CMSG_SPACE(sizeof(__u32))];
579 struct cmsghdr *cmsg;
580 struct sockaddr_can addr;
582 static uint64_t dropcnt = 0;
584 iov.iov_base = frame;
585 msg.msg_name = &addr;
588 msg.msg_control = &ctrlmsg;
590 /* these settings may be modified by recvmsg() */
591 iov.iov_len = sizeof(*frame);
592 msg.msg_namelen = sizeof(addr);
593 msg.msg_controllen = sizeof(ctrlmsg);
596 nbytes = recvmsg(s, &msg, 0);
598 error(1, errno, "recvmsg");
600 if (nbytes < sizeof(struct can_frame))
601 error(1, 0, "recvmsg: incomplete CAN frame\n");
604 MEMSET_ZERO(*ts_kern);
605 for (cmsg = CMSG_FIRSTHDR(&msg);
606 cmsg && (cmsg->cmsg_level == SOL_SOCKET);
607 cmsg = CMSG_NXTHDR(&msg,cmsg)) {
608 if (cmsg->cmsg_type == SO_TIMESTAMPNS)
609 *ts_kern = *(struct timespec *)CMSG_DATA(cmsg);
610 else if (cmsg->cmsg_type == SO_RXQ_OVFL)
611 dropcnt += *(__u32 *)CMSG_DATA(cmsg);
616 void process_tx(int s)
618 error(1, 0, "%s: not implemented", __FUNCTION__);
621 void process_on_wire_rx(int s)
623 struct timespec ts_kern, ts_user, ts_diff;
624 struct can_frame frame;
626 receive(s, &frame, &ts_kern, &ts_user);
627 mi = frame2info(&frame);
628 if (msg_info_used(mi)) {
629 mi->ts_rx_onwire_kern = ts_kern;
630 mi->ts_rx_onwire = ts_user;
632 stats.invalid_frame++;
636 void process_final_rx(int s)
638 struct timespec ts_kern, ts_user, ts_diff;
639 struct can_frame frame;
643 receive(s, &frame, &ts_kern, &ts_user);
644 mi = frame2info(&frame);
645 mi->ts_rx_final_kern = ts_kern;
646 mi->ts_rx_final = ts_user;
647 mi->received = frame;
649 histogram_add(&histogram, get_msg_latency_us(mi));
651 ret = write(completion_pipe[1], &mi, sizeof(mi));
653 error(1, errno, "completion_pipe write");
656 void *measure_thread(void *arg)
659 struct pollfd pfd[3];
660 struct timespec timeout;
661 struct sockaddr_can addr;
663 int consecutive_timeouts = 0;
667 for (i=0; i<num_interfaces; i++) {
668 if ((s = socket(PF_CAN, SOCK_RAW, CAN_RAW)) < 0)
669 error(1, errno, "socket");
671 addr.can_family = AF_CAN;
672 addr.can_ifindex = sock_get_if_index(s, opt.interface[i]);
674 if (i == 0) { /* TX socket */
675 /* disable default receive filter on this RAW socket */
676 /* This is obsolete as we do not read from the socket at all, but for */
677 /* this reason we can remove the receive list in the Kernel to save a */
678 /* little (really a very little!) CPU usage. */
679 if (setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0) == -1)
680 error(1, errno, "SOL_CAN_RAW");
683 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
684 error(1, errno, "bind");
686 const int timestamp_on = 1;
687 if (setsockopt(s, SOL_SOCKET, SO_TIMESTAMPNS,
688 ×tamp_on, sizeof(timestamp_on)) < 0)
689 error(1, errno, "setsockopt SO_TIMESTAMP");
691 const int dropmonitor_on = 1;
692 if (setsockopt(s, SOL_SOCKET, SO_RXQ_OVFL,
693 &dropmonitor_on, sizeof(dropmonitor_on)) < 0)
694 error(1, errno, "setsockopt SO_RXQ_OVFL not supported by your Linux Kernel");
698 pfd[i].events = POLLIN | POLLERR | ((opt.period_us == 0 && !opt.oneattime) ? POLLOUT : 0);
700 pfd[i].events = POLLIN;
703 set_sched_policy_and_prio(SCHED_FIFO, 40);
705 #define SEND() send_and_check(pfd[0].fd)
710 get_tstamp(&stats.tic);
712 while (!finish_flag &&
713 (opt.count == 0 || count < opt.count || msg_in_progress != 0)) {
715 get_next_timeout(&timeout);
716 //printf("ppoll"); fflush(stdout);
717 ret = ppoll(pfd, num_interfaces, &timeout, NULL);
718 //printf("=%d\n", ret);
721 if (!INTERRUPTED_SYSCALL(errno))
722 error(1, errno, "ppoll");
726 if (opt.count == 0 || count < opt.count) {
730 /* Lost message - send a new one */
732 consecutive_timeouts++;
733 if (consecutive_timeouts < 10)
735 else /* Something is really broken */
740 if (pfd[0].revents & (POLLIN|POLLERR)) {
741 process_tx(pfd[0].fd);
743 if (pfd[0].revents & POLLOUT) {
744 if (opt.count == 0 || count < opt.count)
749 if (num_interfaces == 3 && pfd[1].revents & POLLIN) {
750 process_on_wire_rx(pfd[1].fd);
753 if (num_interfaces == 3 && pfd[1].revents & ~POLLIN)
754 error(1, 0, "Unexpected pfd[1].revents: 0x%04x\n", pfd[1].revents);
756 i = (num_interfaces == 2) ? 1 : 2;
757 if (pfd[i].revents & POLLIN) {
758 consecutive_timeouts = 0;
759 process_final_rx(pfd[i].fd);
762 if ((opt.count == 0 || count < opt.count) &&
767 if (pfd[i].revents & ~POLLIN)
768 error(1, 0, "Unexpected pfd[%d].revents: 0x%04x\n", pfd[i].revents);
772 get_tstamp(&stats.tac);
774 for (i=0; i<num_interfaces; i++)
780 struct poptOption optionsTable[] = {
781 { "device", 'd', POPT_ARG_ARGV, &opt.interface, 'd', "Interface to use. Must be given two times (tx, rx) or three times (tx, rx1, rx2)", "interface" },
782 { "count", 'c', POPT_ARG_INT|POPT_ARGFLAG_SHOW_DEFAULT, &opt.count, 0, "The count of messages to send, zero corresponds to infinity", "num"},
783 { "id", 'i', POPT_ARG_INT|POPT_ARGFLAG_SHOW_DEFAULT, &opt.id, 0, "CAN ID of sent messages", "id"},
784 { "period", 'p', POPT_ARG_INT|POPT_ARGFLAG_SHOW_DEFAULT, &opt.period_us, 0, "Period for sending messages or zero (default) to send as fast as possible", "us"},
785 { "timeout",'t', POPT_ARG_INT|POPT_ARGFLAG_SHOW_DEFAULT, &opt.timeout_ms,0, "Timeout when period is zero", "ms"},
786 { "oneattime",'o', POPT_ARG_NONE, &opt.oneattime,0, "Send the next message only when the previous was finally received"},
787 { "verbose",'v', POPT_ARG_NONE, NULL, 'v', "Send the next message only when the previous was finally received"},
788 { "name", 'n', POPT_ARG_STRING, &opt.name, 0, "Prefix of the generated files"},
789 { "length", 'l', POPT_ARG_INT|POPT_ARGFLAG_SHOW_DEFAULT, &opt.length, 0, "The length of generated messages", "bytes"},
790 { "userhist", 'u', POPT_ARG_NONE, &opt.userhist, 0, "Generate histogram from userspace timestamps"},
791 { "quiet", 'q', POPT_ARG_NONE, &opt.quiet, 0, "Do not print progress and statistics"},
793 { NULL, 0, 0, NULL, 0 }
796 int parse_options(int argc, const char *argv[])
799 poptContext optCon; /* context for parsing command-line options */
800 void *local = talloc_new (NULL);
802 optCon = poptGetContext(NULL, argc, argv, optionsTable, 0);
803 //poptSetOtherOptionHelp(optCon, "[OPTIONS]* <port>");
805 /* Now do options processing */
806 while ((c = poptGetNextOpt(optCon)) >= 0) {
814 error(1, 0, "%s: %s\n",
815 poptBadOption(optCon, POPT_BADOPTION_NOALIAS),
818 if (num_interfaces < 1 || num_interfaces > 3)
819 error(1, 0, "-d option must only be given one, two or three times");
821 if (opt.oneattime && opt.period_us)
822 error(1, 0, "oneattime and period cannot be specified at the same time");
825 char *f = talloc_asprintf(local, "%s-msgs.txt", opt.name);
826 opt.f_msgs = fopen(f, "w");
828 error(1, errno, "fopen: %s", f);
832 char *f = talloc_asprintf(local, "%s-hist.txt", opt.name);
833 opt.f_hist = fopen(f, "w");
835 error(1, errno, "fopen: %s", f);
839 char *f = talloc_asprintf(local, "%s-stat.txt", opt.name);
840 opt.f_stat = fopen(f, "w");
842 error(1, errno, "fopen: %s", f);
845 poptFreeContext(optCon);
850 void print_progress()
853 if (num_interfaces > 1)
854 printf("\rSent %5d, in progress %5d", count, msg_in_progress);
856 printf("\rSent %5d", count);
861 int main(int argc, const char *argv[])
867 parse_options(argc, argv);
869 mlockall(MCL_CURRENT | MCL_FUTURE);
871 signal(SIGINT, term_handler);
872 signal(SIGTERM, term_handler);
874 for (i=0; i<MAX_INFOS; i++)
875 msg_infos[i].id = -1;
877 histogram_init(&histogram, 5000000, 1);
879 ret = pipe(completion_pipe);
881 error(1, errno, "pipe");
882 ret = fcntl(completion_pipe[1], F_SETFL, O_NONBLOCK);
884 error(1, errno, "pipe fcntl");
888 pthread_create(&thread, 0, measure_thread, NULL);
890 struct timespec next, now, diff, allsent = {0,0};
891 clock_gettime(CLOCK_MONOTONIC, &next);
893 while (!finish_flag && (opt.count == 0 || completed < opt.count)) {
894 struct pollfd pfd[1];
895 pfd[0].fd = completion_pipe[0];
896 pfd[0].events = POLLIN;
897 ret = poll(pfd, 1, 100);
898 if (ret == -1 && !INTERRUPTED_SYSCALL(errno))
899 error(1, errno, "poll main");
900 if (ret > 0 && (pfd[0].revents & POLLIN)) {
903 ret = read(completion_pipe[0], &mi, sizeof(mi));
904 if (ret < sizeof(mi))
905 error(1, errno, "read completion returned %d", ret);
906 msg_info_print(opt.f_msgs, mi);
911 clock_gettime(CLOCK_MONOTONIC, &now);
912 if (timespec_subtract(&diff, &next, &now)) {
914 next.tv_nsec += 100000000;
915 while (next.tv_nsec >= 1000000000) {
916 next.tv_nsec -= 1000000000;
920 if (opt.count != 0 && count >= opt.count) {
921 if (allsent.tv_sec == 0)
923 timespec_subtract(&diff, &now, &allsent);
924 if (diff.tv_sec >= 1)
932 stats.lost = msg_in_progress;
934 pthread_join(thread, NULL);
936 close(completion_pipe[0]);
937 close(completion_pipe[1]);
939 histogram_fprint(&histogram, opt.f_hist);
944 fprintf(opt.f_stat, "cmdline='");
945 for (i=0; i<argc; i++)
946 fprintf(opt.f_stat, "%s%s", argv[i], i < argc-1 ? " " : "");
947 fprintf(opt.f_stat, "'\n");
949 timespec_subtract(&diff, &stats.tac, &stats.tic);
950 fprintf(opt.f_stat, "duration=%s # seconds\n", tstamp_str(NULL, &diff));
952 fprintf(opt.f_stat, "sent=%d\n", count);
953 fprintf(opt.f_stat, "overrun=%d\n", stats.overrun);
954 if (stats.overrun && !opt.quiet)
955 printf("overrun=%d\n", stats.overrun);
956 fprintf(opt.f_stat, "enobufs=%d\n", stats.enobufs);
957 if (stats.enobufs && !opt.quiet)
958 printf("enobufs=%d\n", stats.enobufs);
959 fprintf(opt.f_stat, "lost=%d\n", stats.lost);
960 if (stats.lost && !opt.quiet)
961 printf("lost=%d\n", stats.lost);
962 fprintf(opt.f_stat, "timeouts=%d\n", stats.timeouts);
963 if (stats.timeouts && !opt.quiet)
964 printf("timeouts=%d\n", stats.timeouts);
965 fprintf(opt.f_stat, "invalid_frame=%d\n", stats.timeouts);
966 if (stats.timeouts && !opt.quiet)
967 printf("invalid_frame=%d\n", stats.timeouts);