ust: cleanup hello.c

[ust.git] / hello / hello.c

#include <stdio.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#include "../libmarkers/marker.h"
#include "usterr.h"
#include "tracer.h"
#include "marker-control.h"
#include "relay.h"


char consumer_stack[10000];
char trace_name[] = "theusttrace";
char trace_type[] = "ustrelay";

#define CPRINTF(fmt, args...) safe_printf(fmt "\n", ## args)

int safe_printf(const char *fmt, ...)
{
	static char buf[500];
	va_list ap;
	int n;

	va_start(ap, fmt);

	n = vsnprintf(buf, sizeof(buf), fmt, ap);

	write(STDOUT_FILENO, buf, n);

	va_end(ap);
}

struct consumer_channel {
	int fd;
	struct ltt_channel_struct *chan;
};

int consumer(void *arg)
{
	int result;
	int fd;
	char str[] = "Hello, this is the consumer.\n";
	struct ltt_trace_struct *trace;
	struct consumer_channel *consumer_channels;
	int i;

	ltt_lock_traces();
	trace = _ltt_trace_find(trace_name);
	ltt_unlock_traces();

	if(trace == NULL) {
		CPRINTF("cannot find trace!");
		return 1;
	}

	consumer_channels = (struct consumer_channel *) malloc(trace->nr_channels * sizeof(struct consumer_channel));
if(consumer_channels == NULL) {
		ERR("malloc returned NULL");
		return 1;
	}

	CPRINTF("opening trace files");
	for(i=0; i<trace->nr_channels; i++) {
		char tmp[100];
		struct ltt_channel_struct *chan = &trace->channels[i];

		consumer_channels[i].chan = chan;

		snprintf(tmp, sizeof(tmp), "trace/%s", chan->channel_name);
		result = consumer_channels[i].fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 00644);
		if(result == -1) {
			perror("open");
			return -1;
		}
		CPRINTF("\topened trace file %s", tmp);
		
	}
	CPRINTF("done opening trace files");

	for(;;) {
		/*wait*/

		for(i=0; i<trace->nr_channels; i++) {
			struct rchan *rchan = consumer_channels[i].chan->trans_channel_data;
			struct rchan_buf *rbuf = rchan->buf;
			struct ltt_channel_buf_struct *lttbuf = consumer_channels[i].chan->buf;
			long consumed_old;

			result = ltt_do_get_subbuf(rbuf, lttbuf, &consumed_old);
			if(result < 0) {
				CPRINTF("ltt_do_get_subbuf: error: %s", strerror(-result));
			}
			else {
				CPRINTF("success!");

				result = write(consumer_channels[i].fd, rbuf->buf_data + (consumed_old & (2 * 4096-1)), 4096);
				ltt_do_put_subbuf(rbuf, lttbuf, consumed_old);
			}
		}

		sleep(1);
	}

//	CPRINTF("consumer: got a trace: %s with %d channels\n", trace_name, trace->nr_channels);
//
//	struct ltt_channel_struct *chan = &trace->channels[0];
//
//	CPRINTF("channel 1 (%s) active=%u", chan->channel_name, chan->active & 1);

//	struct rchan *rchan = chan->trans_channel_data;
//	struct rchan_buf *rbuf = rchan->buf;
//	struct ltt_channel_buf_struct *lttbuf = chan->buf;
//	long consumed_old;
//
//	result = fd = open("trace.out", O_WRONLY | O_CREAT | O_TRUNC, 00644);
//	if(result == -1) {
//		perror("open");
//		return -1;
//	}

//	for(;;) {
//		write(STDOUT_FILENO, str, sizeof(str));
//
//		result = ltt_do_get_subbuf(rbuf, lttbuf, &consumed_old);
//		if(result < 0) {
//			CPRINTF("ltt_do_get_subbuf: error: %s", strerror(-result));
//		}
//		else {
//			CPRINTF("success!");
//
//			result = write(fd, rbuf->buf_data + (consumed_old & (2 * 4096-1)), 4096);
//			ltt_do_put_subbuf(rbuf, lttbuf, consumed_old);
//		}
//
//		//CPRINTF("There seems to be %ld bytes available", SUBBUF_TRUNC(local_read(&lttbuf->offset), rbuf->chan) - consumed_old);
//		CPRINTF("Commit count %ld", local_read(&lttbuf->commit_count[0]));
//
//
//		sleep(1);
//	}
}

void start_consumer(void)
{
	int result;

	result = clone(consumer, consumer_stack+sizeof(consumer_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
	if(result == -1) {
		perror("clone");
	}
}

void probe(const struct marker *mdata,
		void *probe_private, void *call_private,
		const char *fmt, va_list *args)
{
	printf("In probe\n");
}

void inthandler(int sig)
{
	printf("in handler\n");
	exit(0);
}

int init_int_handler(void)
{
	int result;
	struct sigaction act;

	result = sigemptyset(&act.sa_mask);
	if(result == -1) {
		PERROR("sigemptyset");
		return -1;
	}

	act.sa_handler = inthandler;
	act.sa_flags = SA_RESTART;

	/* Only defer ourselves. Also, try to restart interrupted
	 * syscalls to disturb the traced program as little as possible.
	 */
	result = sigaction(SIGINT, &act, NULL);
	if(result == -1) {
		PERROR("sigaction");
		return -1;
	}

	return 0;
}

int main()
{
	int result;
	int i;

	init_int_handler();

	result = ltt_marker_connect("foo", "bar", "default");
	if(result)
		ERR("ltt_marker_connect");

	result = ltt_trace_setup(trace_name);
	if(result < 0) {
		ERR("ltt_trace_setup failed");
		return 1;
	}

	result = ltt_trace_set_type(trace_name, trace_type);
	if(result < 0) {
		ERR("ltt_trace_set_type failed");
		return 1;
	}

	result = ltt_trace_alloc(trace_name);
	if(result < 0) {
		ERR("ltt_trace_alloc failed");
		return 1;
	}

	result = ltt_trace_start(trace_name);
	if(result < 0) {
		ERR("ltt_trace_start failed");
		return 1;
	}

	start_consumer();
	printf("Hello, World!\n");

	sleep(1);
	for(i=0; i<50; i++) {
		trace_mark(foo, bar, "%s", "FOOBAZ");
		usleep(100000);
	}

	ltt_trace_stop(trace_name);
	ltt_trace_destroy(trace_name);

	scanf("%*s");

	return 0;
}

MARKER_LIB