X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=libtracectl%2Ftracectl.c;h=917937f21994574eb8f4933a6ff45cbcb02898e7;hb=3a7b90de71f2a82f73f06fb14a7b77805aea1064;hp=46874d4ad4d56d15c2e6217906ebac8d898f719e;hpb=98963de4a2dfae12d8aafa0f9a6d97cf4a44e12d;p=ust.git

diff --git a/libtracectl/tracectl.c b/libtracectl/tracectl.c
index 46874d4..917937f 100644
--- a/libtracectl/tracectl.c
+++ b/libtracectl/tracectl.c
@@ -5,22 +5,29 @@
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <sched.h>
-#define UNIX_PATH_MAX 108
+#include <fcntl.h>
+#include <poll.h>
 
-//#define SOCKETDIR "/var/run/ust/socks"
-#define SOCKETDIR "/tmp/socks"
-#define SOCKETDIRLEN sizeof(SOCKETDIR)
-#define USTSIGNAL SIGIO
+#include "marker.h"
+#include "tracer.h"
+#include "localerr.h"
+#include "ustcomm.h"
+#include "relay.h" /* FIXME: remove */
+
+//#define USE_CLONE
 
-#define DBG(fmt, args...) fprintf(stderr, fmt "\n", ## args)
-#define WARN(fmt, args...) fprintf(stderr, "usertrace: WARNING: " fmt "\n", ## args)
-#define ERR(fmt, args...) fprintf(stderr, "usertrace: ERROR: " fmt "\n", ## args)
-#define PERROR(call) perror("usertrace: ERROR: " call)
+#define USTSIGNAL SIGIO
 
 #define MAX_MSG_SIZE (100)
 #define MSG_NOTIF 1
 #define MSG_REGISTER_NOTIF 2
 
+char consumer_stack[10000];
+
+struct list_head blocked_consumers = LIST_HEAD_INIT(blocked_consumers);
+
+static struct ustcomm_app ustcomm_app;
+
 struct tracecmd { /* no padding */
 	uint32_t size;
 	uint16_t command;
@@ -40,9 +47,125 @@ struct trctl_msg {
 	char payload[94];
 };
 
-pid_t mypid;
-char mysocketfile[UNIX_PATH_MAX] = "";
-int pfd = -1;
+struct consumer_channel {
+	int fd;
+	struct ltt_channel_struct *chan;
+};
+
+struct blocked_consumer {
+	int fd_consumer;
+	int fd_producer;
+	int tmp_poll_idx;
+
+	/* args to ustcomm_send_reply */
+	struct ustcomm_server server;
+	struct ustcomm_source src;
+
+	/* args to ltt_do_get_subbuf */
+	struct rchan_buf *rbuf;
+	struct ltt_channel_buf_struct *lttbuf;
+
+	struct list_head list;
+};
+
+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;
+	char trace_name[] = "auto";
+
+	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_0", chan->channel_name);
+		result = consumer_channels[i].fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC, 00600);
+		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) {
+				DBG("ltt_do_get_subbuf: error: %s", strerror(-result));
+			}
+			else {
+				DBG("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);
+	}
+}
+
+void start_consumer(void)
+{
+#ifdef USE_CLONE
+	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");
+	}
+#else
+	pthread_t thread;
+
+	pthread_create(&thread, NULL, consumer, NULL);
+#endif
+}
+
+static void print_markers(void)
+{
+	struct marker_iter iter;
+
+	lock_markers();
+	marker_iter_reset(&iter);
+	marker_iter_start(&iter);
+
+	while(iter.marker) {
+		fprintf(stderr, "marker: %s_%s \"%s\"\n", iter.marker->channel, iter.marker->name, iter.marker->format);
+		marker_iter_next(&iter);
+	}
+	unlock_markers();
+}
 
 void do_command(struct tracecmd *cmd)
 {
@@ -74,78 +197,531 @@ void notif_cb(void)
 	}
 }
 
-int listener_main(void *p)
+static int inform_consumer_daemon(void)
+{
+	ustcomm_request_consumer(getpid(), "metadata");
+	ustcomm_request_consumer(getpid(), "ust");
+}
+
+void process_blocked_consumers(void)
 {
+	int n_fds = 0;
+	struct pollfd *fds;
+	struct blocked_consumer *bc;
+	int idx = 0;
+	char inbuf;
 	int result;
 
-	/* Allowing only 1 connection for now. */
-	result = listen(pfd, 1);
+	list_for_each_entry(bc, &blocked_consumers, list) {
+		n_fds++;
+	}
+
+	fds = (struct pollfd *) malloc(n_fds * sizeof(struct pollfd));
+	if(fds == NULL) {
+		ERR("malloc returned NULL");
+		return;
+	}
+
+	list_for_each_entry(bc, &blocked_consumers, list) {
+		fds[idx].fd = bc->fd_producer;
+		fds[idx].events = POLLIN;
+		bc->tmp_poll_idx = idx;
+		idx++;
+	}
+
+	result = poll(fds, n_fds, 0);
 	if(result == -1) {
-		PERROR("listen");
-		return 1;
+		PERROR("poll");
+		return -1;
 	}
 
-	for(;;) {
+	list_for_each_entry(bc, &blocked_consumers, list) {
+		if(fds[bc->tmp_poll_idx].revents) {
+			long consumed_old = 0;
+			char *reply;
+
+			result = read(bc->fd_producer, &inbuf, 1);
+			if(result == -1) {
+				PERROR("read");
+				continue;
+			}
+			if(result == 0) {
+				DBG("PRODUCER END");
+
+				close(bc->fd_producer);
+
+				__list_del(bc->list.prev, bc->list.next);
+
+				result = ustcomm_send_reply(&bc->server, "END", &bc->src);
+				if(result < 0) {
+					ERR("ustcomm_send_reply failed");
+					continue;
+				}
+
+				continue;
+			}
+
+			result = ltt_do_get_subbuf(bc->rbuf, bc->lttbuf, &consumed_old);
+			if(result == -EAGAIN) {
+				WARN("missed buffer?");
+				continue;
+			}
+			else if(result < 0) {
+				DBG("ltt_do_get_subbuf: error: %s", strerror(-result));
+			}
+			asprintf(&reply, "%s %ld", "OK", consumed_old);
+			result = ustcomm_send_reply(&bc->server, reply, &bc->src);
+			if(result < 0) {
+				ERR("ustcomm_send_reply failed");
+				free(reply);
+				continue;
+			}
+			free(reply);
+
+			__list_del(bc->list.prev, bc->list.next);
+		}
+	}
+
+}
+
+int listener_main(void *p)
+{
+	int result;
+
+	DBG("LISTENER");
 
+	for(;;) {
 		uint32_t size;
-		int fd;
 		struct sockaddr_un addr;
 		socklen_t addrlen = sizeof(addr);
+		char trace_name[] = "auto";
+		char trace_type[] = "ustrelay";
+		char *recvbuf;
+		int len;
+		struct ustcomm_source src;
 
-		result = fd = accept(pfd, (struct sockaddr *)&addr, &addrlen);
-		if(result == -1) {
-			PERROR("accept");
+		process_blocked_consumers();
+
+		result = ustcomm_app_recv_message(&ustcomm_app, &recvbuf, &src, 5);
+		if(result < 0) {
+			WARN("error in ustcomm_app_recv_message");
+			continue;
+		}
+		else if(result == 0) {
+			/* no message */
 			continue;
 		}
 
-		for(;;) {
-			struct trctl_msg msg;
-			unsigned char dontclose=0;
+		DBG("received a message! it's: %s\n", recvbuf);
+		len = strlen(recvbuf);
 
-			result = read(fd, &msg.size, sizeof(msg.size));
-			if(result == -1) {
-				PERROR("read");
-				continue;
+		if(!strcmp(recvbuf, "print_markers")) {
+			print_markers();
+		}
+		else if(!strcmp(recvbuf, "trace_setup")) {
+			DBG("trace setup");
+
+			result = ltt_trace_setup(trace_name);
+			if(result < 0) {
+				ERR("ltt_trace_setup failed");
+				return;
+			}
+
+			result = ltt_trace_set_type(trace_name, trace_type);
+			if(result < 0) {
+				ERR("ltt_trace_set_type failed");
+				return;
 			}
+		}
+		else if(!strcmp(recvbuf, "trace_alloc")) {
+			DBG("trace alloc");
 
-			if(size > MAX_MSG_SIZE) {
-				ERR("trctl message too big");
-				break;
+			result = ltt_trace_alloc(trace_name);
+			if(result < 0) {
+				ERR("ltt_trace_alloc failed");
+				return;
 			}
+		}
+		else if(!strcmp(recvbuf, "trace_start")) {
+			DBG("trace start");
 
-			result = read(fd, &msg.type, sizeof(msg.type));
-			if(result == -1) {
-				PERROR("read");
+			result = ltt_trace_start(trace_name);
+			if(result < 0) {
+				ERR("ltt_trace_start failed");
 				continue;
 			}
+		}
+		else if(!strcmp(recvbuf, "trace_stop")) {
+			DBG("trace stop");
 
-			switch(msg.type) {
-				case MSG_REGISTER_NOTIF:
-					/* TODO: put it in notif mode */
-					goto next_conn;
-			};
+			result = ltt_trace_stop(trace_name);
+			if(result < 0) {
+				ERR("ltt_trace_stop failed");
+				return;
+			}
 		}
-		next_conn:;
+		else if(!strcmp(recvbuf, "trace_destroy")) {
+
+			DBG("trace destroy");
+
+			result = ltt_trace_destroy(trace_name);
+			if(result < 0) {
+				ERR("ltt_trace_destroy failed");
+				return;
+			}
+		}
+		else if(nth_token_is(recvbuf, "get_shmid", 0) == 1) {
+			struct ltt_trace_struct *trace;
+			char trace_name[] = "auto";
+			int i;
+			char *channel_name;
+
+			DBG("get_shmid");
+
+			channel_name = nth_token(recvbuf, 1);
+			if(channel_name == NULL) {
+				ERR("get_shmid: cannot parse channel");
+				goto next_cmd;
+			}
+
+			ltt_lock_traces();
+			trace = _ltt_trace_find(trace_name);
+			ltt_unlock_traces();
+
+			if(trace == NULL) {
+				CPRINTF("cannot find trace!");
+				return 1;
+			}
+
+			for(i=0; i<trace->nr_channels; i++) {
+				struct rchan *rchan = trace->channels[i].trans_channel_data;
+				struct rchan_buf *rbuf = rchan->buf;
+
+				if(!strcmp(trace->channels[i].channel_name, channel_name)) {
+					char *reply;
+
+					DBG("the shmid for the requested channel is %d", rbuf->shmid);
+					asprintf(&reply, "%d", rbuf->shmid);
+
+					result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
+					if(result) {
+						ERR("listener: get_shmid: ustcomm_send_reply failed");
+						goto next_cmd;
+					}
+
+					free(reply);
+
+					break;
+				}
+			}
+		}
+		else if(nth_token_is(recvbuf, "get_n_subbufs", 0) == 1) {
+			struct ltt_trace_struct *trace;
+			char trace_name[] = "auto";
+			int i;
+			char *channel_name;
+
+			DBG("get_n_subbufs");
+
+			channel_name = nth_token(recvbuf, 1);
+			if(channel_name == NULL) {
+				ERR("get_n_subbufs: cannot parse channel");
+				goto next_cmd;
+			}
+
+			ltt_lock_traces();
+			trace = _ltt_trace_find(trace_name);
+			ltt_unlock_traces();
+
+			if(trace == NULL) {
+				CPRINTF("cannot find trace!");
+				return 1;
+			}
+
+			for(i=0; i<trace->nr_channels; i++) {
+				struct rchan *rchan = trace->channels[i].trans_channel_data;
+
+				if(!strcmp(trace->channels[i].channel_name, channel_name)) {
+					char *reply;
+
+					DBG("the n_subbufs for the requested channel is %d", rchan->n_subbufs);
+					asprintf(&reply, "%d", rchan->n_subbufs);
+
+					result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
+					if(result) {
+						ERR("listener: get_n_subbufs: ustcomm_send_reply failed");
+						goto next_cmd;
+					}
+
+					free(reply);
+
+					break;
+				}
+			}
+		}
+		else if(nth_token_is(recvbuf, "get_subbuf_size", 0) == 1) {
+			struct ltt_trace_struct *trace;
+			char trace_name[] = "auto";
+			int i;
+			char *channel_name;
+
+			DBG("get_subbuf_size");
+
+			channel_name = nth_token(recvbuf, 1);
+			if(channel_name == NULL) {
+				ERR("get_subbuf_size: cannot parse channel");
+				goto next_cmd;
+			}
+
+			ltt_lock_traces();
+			trace = _ltt_trace_find(trace_name);
+			ltt_unlock_traces();
+
+			if(trace == NULL) {
+				CPRINTF("cannot find trace!");
+				return 1;
+			}
+
+			for(i=0; i<trace->nr_channels; i++) {
+				struct rchan *rchan = trace->channels[i].trans_channel_data;
+
+				if(!strcmp(trace->channels[i].channel_name, channel_name)) {
+					char *reply;
+
+					DBG("the subbuf_size for the requested channel is %d", rchan->subbuf_size);
+					asprintf(&reply, "%d", rchan->subbuf_size);
+
+					result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
+					if(result) {
+						ERR("listener: get_subbuf_size: ustcomm_send_reply failed");
+						goto next_cmd;
+					}
+
+					free(reply);
+
+					break;
+				}
+			}
+		}
+		else if(nth_token_is(recvbuf, "load_probe_lib", 0) == 1) {
+			char *libfile;
+
+			libfile = nth_token(recvbuf, 1);
+
+			DBG("load_probe_lib loading %s", libfile);
+		}
+		else if(nth_token_is(recvbuf, "get_subbuffer", 0) == 1) {
+			struct ltt_trace_struct *trace;
+			char trace_name[] = "auto";
+			int i;
+			char *channel_name;
+
+			DBG("get_subbuf");
+
+			channel_name = nth_token(recvbuf, 1);
+			if(channel_name == NULL) {
+				ERR("get_subbuf: cannot parse channel");
+				goto next_cmd;
+			}
+
+			ltt_lock_traces();
+			trace = _ltt_trace_find(trace_name);
+			ltt_unlock_traces();
+
+			if(trace == NULL) {
+				CPRINTF("cannot find trace!");
+				return 1;
+			}
+
+			for(i=0; i<trace->nr_channels; i++) {
+				struct rchan *rchan = trace->channels[i].trans_channel_data;
+
+				if(!strcmp(trace->channels[i].channel_name, channel_name)) {
+					struct rchan_buf *rbuf = rchan->buf;
+					struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
+					char *reply;
+					long consumed_old=0;
+					int fd;
+					struct blocked_consumer *bc;
+
+					bc = (struct blocked_consumer *) malloc(sizeof(struct blocked_consumer));
+					if(bc == NULL) {
+						ERR("malloc returned NULL");
+						goto next_cmd;
+					}
+					bc->fd_consumer = src.fd;
+					bc->fd_producer = lttbuf->data_ready_fd_read;
+					bc->rbuf = rbuf;
+					bc->lttbuf = lttbuf;
+					bc->src = src;
+					bc->server = ustcomm_app.server;
+
+					list_add(&bc->list, &blocked_consumers);
+
+					break;
+				}
+			}
+		}
+		else if(nth_token_is(recvbuf, "put_subbuffer", 0) == 1) {
+			struct ltt_trace_struct *trace;
+			char trace_name[] = "auto";
+			int i;
+			char *channel_name;
+			long consumed_old;
+			char *consumed_old_str;
+			char *endptr;
+
+			DBG("put_subbuf");
+
+			channel_name = strdup_malloc(nth_token(recvbuf, 1));
+			if(channel_name == NULL) {
+				ERR("put_subbuf_size: cannot parse channel");
+				goto next_cmd;
+			}
+
+			consumed_old_str = strdup_malloc(nth_token(recvbuf, 2));
+			if(consumed_old_str == NULL) {
+				ERR("put_subbuf: cannot parse consumed_old");
+				goto next_cmd;
+			}
+			consumed_old = strtol(consumed_old_str, &endptr, 10);
+			if(*endptr != '\0') {
+				ERR("put_subbuf: invalid value for consumed_old");
+				goto next_cmd;
+			}
+
+			ltt_lock_traces();
+			trace = _ltt_trace_find(trace_name);
+			ltt_unlock_traces();
+
+			if(trace == NULL) {
+				CPRINTF("cannot find trace!");
+				return 1;
+			}
+
+			for(i=0; i<trace->nr_channels; i++) {
+				struct rchan *rchan = trace->channels[i].trans_channel_data;
+
+				if(!strcmp(trace->channels[i].channel_name, channel_name)) {
+					struct rchan_buf *rbuf = rchan->buf;
+					struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
+					char *reply;
+					long consumed_old=0;
+
+					result = ltt_do_put_subbuf(rbuf, lttbuf, consumed_old);
+					if(result < 0) {
+						WARN("ltt_do_put_subbuf: error");
+					}
+					else {
+						DBG("ltt_do_put_subbuf: success");
+					}
+					asprintf(&reply, "%s", "OK", consumed_old);
+
+					result = ustcomm_send_reply(&ustcomm_app.server, reply, &src);
+					if(result) {
+						ERR("listener: put_subbuf: ustcomm_send_reply failed");
+						goto next_cmd;
+					}
+
+					free(reply);
+
+					break;
+				}
+			}
+
+			free(channel_name);
+			free(consumed_old_str);
+		}
+//		else if(nth_token_is(recvbuf, "get_notifications", 0) == 1) {
+//			struct ltt_trace_struct *trace;
+//			char trace_name[] = "auto";
+//			int i;
+//			char *channel_name;
+//
+//			DBG("get_notifications");
+//
+//			channel_name = strdup_malloc(nth_token(recvbuf, 1));
+//			if(channel_name == NULL) {
+//				ERR("put_subbuf_size: cannot parse channel");
+//				goto next_cmd;
+//			}
+//
+//			ltt_lock_traces();
+//			trace = _ltt_trace_find(trace_name);
+//			ltt_unlock_traces();
+//
+//			if(trace == NULL) {
+//				CPRINTF("cannot find trace!");
+//				return 1;
+//			}
+//
+//			for(i=0; i<trace->nr_channels; i++) {
+//				struct rchan *rchan = trace->channels[i].trans_channel_data;
+//				int fd;
+//
+//				if(!strcmp(trace->channels[i].channel_name, channel_name)) {
+//					struct rchan_buf *rbuf = rchan->buf;
+//					struct ltt_channel_buf_struct *lttbuf = trace->channels[i].buf;
+//
+//					result = fd = ustcomm_app_detach_client(&ustcomm_app, &src);
+//					if(result == -1) {
+//						ERR("ustcomm_app_detach_client failed");
+//						goto next_cmd;
+//					}
+//
+//					lttbuf->wake_consumer_arg = (void *) fd;
+//
+//					smp_wmb();
+//
+//					lttbuf->call_wake_consumer = 1;
+//
+//					break;
+//				}
+//			}
+//
+//			free(channel_name);
+//		}
+		else {
+			ERR("unable to parse message: %s", recvbuf);
+		}
+
+	next_cmd:
+		free(recvbuf);
 	}
 }
 
+static char listener_stack[16384];
+
 void create_listener(void)
 {
 	int result;
 	static char listener_stack[16384];
+	//char *listener_stack = malloc(16384);
 
-	result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM, NULL);
+#ifdef USE_CLONE
+	result = clone(listener_main, listener_stack+sizeof(listener_stack)-1, CLONE_FS | CLONE_FILES | CLONE_VM | CLONE_SIGHAND | CLONE_THREAD, NULL);
 	if(result == -1) {
 		perror("clone");
 	}
+#else
+	pthread_t thread;
+
+	pthread_create(&thread, NULL, listener_main, NULL);
+#endif
 }
 
-/* The signal handler itself. */
+/* The signal handler itself. Signals must be setup so there cannot be
+   nested signals. */
 
 void sighandler(int sig)
 {
+	static char have_listener = 0;
 	DBG("sighandler");
-	receive_commands();
+
+	if(!have_listener) {
+		create_listener();
+		have_listener = 1;
+	}
 }
 
 /* Called by the app signal handler to chain it to us. */
@@ -157,56 +733,20 @@ void chain_signal(void)
 
 static int init_socket(void)
 {
-	int result;
-	int fd;
-	char pidstr[6];
-	int pidlen;
-
-	struct sockaddr_un addr;
-	
-	result = fd = socket(PF_UNIX, SOCK_SEQPACKET, 0);
-	if(result == -1) {
-		PERROR("socket");
-		return -1;
-	}
-
-	addr.sun_family = AF_UNIX;
-
-	result = snprintf(addr.sun_path, UNIX_PATH_MAX, "%s/%d", SOCKETDIR, mypid);
-	if(result >= UNIX_PATH_MAX) {
-		ERR("string overflow allocating socket name");
-		goto close_sock;
-	}
-	//DBG("opening socket at %s", addr.sun_path);
-
-	result = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
-	if(result == -1) {
-		PERROR("bind");
-		goto close_sock;
-	}
-
-	strcpy(mysocketfile, addr.sun_path);
-
-	pfd = fd;
-	return 0;
-
-	close_sock:
-	close(fd);
-
-	return -1;
+	return ustcomm_init_app(getpid(), &ustcomm_app);
 }
 
 static void destroy_socket(void)
 {
-	int result;
-
-	if(mysocketfile[0] == '\0')
-		return;
-
-	result = unlink(mysocketfile);
-	if(result == -1) {
-		PERROR("unlink");
-	}
+//	int result;
+//
+//	if(mysocketfile[0] == '\0')
+//		return;
+//
+//	result = unlink(mysocketfile);
+//	if(result == -1) {
+//		PERROR("unlink");
+//	}
 }
 
 static int init_signal_handler(void)
@@ -240,14 +780,34 @@ static int init_signal_handler(void)
 	return 0;
 }
 
-static void __attribute__((constructor)) init()
+static void auto_probe_connect(struct marker *m)
+{
+	int result;
+
+	result = ltt_marker_connect(m->channel, m->name, "default");
+	if(result)
+		ERR("ltt_marker_connect");
+
+	DBG("just auto connected marker %s %s to probe default", m->channel, m->name);
+}
+
+static void __attribute__((constructor(101))) init0()
+{
+	DBG("UST_AUTOPROBE constructor");
+	if(getenv("UST_AUTOPROBE")) {
+		marker_set_new_marker_cb(auto_probe_connect);
+	}
+}
+
+static void fini(void);
+
+static void __attribute__((constructor(1000))) init()
 {
 	int result;
 
-	mypid = getpid();
+	DBG("UST_TRACE constructor");
 
-	/* Must create socket before signal handler to prevent races
-         * on pfd variable.
+	/* Must create socket before signal handler to prevent races.
          */
 	result = init_socket();
 	if(result == -1) {
@@ -260,6 +820,52 @@ static void __attribute__((constructor)) init()
 		return;
 	}
 
+	if(getenv("UST_TRACE")) {
+		char trace_name[] = "auto";
+		char trace_type[] = "ustrelay";
+
+		DBG("starting early tracing");
+
+		/* Ensure marker control is initialized */
+		init_marker_control();
+
+		/* Ensure relay is initialized */
+		init_ustrelay_transport();
+
+		/* Ensure markers are initialized */
+		init_markers();
+
+		/* In case. */
+		ltt_channels_register("ust");
+
+		result = ltt_trace_setup(trace_name);
+		if(result < 0) {
+			ERR("ltt_trace_setup failed");
+			return;
+		}
+
+		result = ltt_trace_set_type(trace_name, trace_type);
+		if(result < 0) {
+			ERR("ltt_trace_set_type failed");
+			return;
+		}
+
+		result = ltt_trace_alloc(trace_name);
+		if(result < 0) {
+			ERR("ltt_trace_alloc failed");
+			return;
+		}
+
+		result = ltt_trace_start(trace_name);
+		if(result < 0) {
+			ERR("ltt_trace_start failed");
+			return;
+		}
+		//start_consumer();
+		inform_consumer_daemon();
+	}
+
+
 	return;
 
 	/* should decrementally destroy stuff if error */
@@ -271,5 +877,25 @@ static void __attribute__((constructor)) init()
 
 static void __attribute__((destructor)) fini()
 {
+	int result;
+
+	/* if trace running, finish it */
+
+	DBG("destructor stopping traces");
+
+	result = ltt_trace_stop("auto");
+	if(result == -1) {
+		ERR("ltt_trace_stop error");
+	}
+
+	result = ltt_trace_destroy("auto");
+	if(result == -1) {
+		ERR("ltt_trace_destroy error");
+	}
+
+	/* FIXME: wait for the consumer to be done */
+	DBG("waiting 5 sec for consume");
+	sleep(5);
+
 	destroy_socket();
 }