[ust.git] / ustd / ustd.c

/* Copyright (C) 2009  Pierre-Marc Fournier
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 */

#define _GNU_SOURCE

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/shm.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
#include <signal.h>

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <getopt.h>

#include "ustd.h"
#include "localerr.h"
#include "ustcomm.h"
#include "share.h"

/* return value: 0 = subbuffer is finished, it won't produce data anymore
 *               1 = got subbuffer successfully
 *               <0 = error
 */

#define GET_SUBBUF_OK 1
#define GET_SUBBUF_DONE 0
#define GET_SUBBUF_DIED 2

#define PUT_SUBBUF_OK 1
#define PUT_SUBBUF_DIED 0
#define PUT_SUBBUF_PUSHED 2

char *sock_path=NULL;
char *trace_path=NULL;

/* Number of active buffers and the mutex to protect it. */
int active_buffers = 0;
pthread_mutex_t active_buffers_mutex = PTHREAD_MUTEX_INITIALIZER;
/* Whether a request to end the program was received. */
sig_atomic_t terminate_req = 0;

int get_subbuffer(struct buffer_info *buf)
{
	char *send_msg=NULL;
	char *received_msg=NULL;
	char *rep_code=NULL;
	int retval;
	int result;

	asprintf(&send_msg, "get_subbuffer %s", buf->name);
	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
	if(result == -1 && errno == EPIPE || result == 0) {
		DBG("app died while being traced");
		retval = GET_SUBBUF_DIED;
		goto end;
	}
	else if(result < 0) {
		ERR("get_subbuffer: ustcomm_send_request failed");
		retval = -1;
		goto end;
	}

	result = sscanf(received_msg, "%as %ld", &rep_code, &buf->consumed_old);
	if(result != 2 && result != 1) {
		ERR("unable to parse response to get_subbuffer");
		retval = -1;
		goto end_rep;
	}

	DBG("received msg is %s", received_msg);

	if(!strcmp(rep_code, "OK")) {
		DBG("got subbuffer %s", buf->name);
		retval = GET_SUBBUF_OK;
	}
	else if(nth_token_is(received_msg, "END", 0) == 1) {
		retval = GET_SUBBUF_DONE;
		goto end_rep;
	}
	else {
		DBG("error getting subbuffer %s", buf->name);
		retval = -1;
	}

	/* FIMXE: free correctly the stuff */
end_rep:
	if(rep_code)
		free(rep_code);
end:
	if(send_msg)
		free(send_msg);
	if(received_msg)
		free(received_msg);

	return retval;
}

int put_subbuffer(struct buffer_info *buf)
{
	char *send_msg=NULL;
	char *received_msg=NULL;
	char *rep_code=NULL;
	int retval;
	int result;

	asprintf(&send_msg, "put_subbuffer %s %ld", buf->name, buf->consumed_old);
	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
	if(result < 0 && errno == ECONNRESET) {
		retval = PUT_SUBBUF_DIED;
		goto end;
	}
	if(result < 0) {
		ERR("put_subbuffer: send_message failed");
		retval = -1;
		goto end;
	}

	result = sscanf(received_msg, "%as", &rep_code);
	if(result != 1) {
		ERR("unable to parse response to put_subbuffer");
		retval = -1;
		goto end_rep;
	}

	if(!strcmp(rep_code, "OK")) {
		DBG("subbuffer put %s", buf->name);
		retval = PUT_SUBBUF_OK;
	}
	else {
		DBG("put_subbuffer: received error, we were pushed");
		retval = PUT_SUBBUF_PUSHED;
		goto end_rep;
	}

end_rep:
	if(rep_code)
		free(rep_code);

end:
	if(send_msg)
		free(send_msg);
	if(received_msg)
		free(received_msg);

	return retval;
}

void decrement_active_buffers(void *arg)
{
	pthread_mutex_lock(&active_buffers_mutex);
	active_buffers--;
	pthread_mutex_unlock(&active_buffers_mutex);
}

void *consumer_thread(void *arg)
{
	struct buffer_info *buf = (struct buffer_info *) arg;
	int result;

	pthread_cleanup_push(decrement_active_buffers, NULL);

	for(;;) {
		/* get the subbuffer */
		result = get_subbuffer(buf);
		if(result == -1) {
			ERR("error getting subbuffer");
			continue;
		}
		else if(result == GET_SUBBUF_DONE) {
			/* this is done */
			break;
		}
		else if(result == GET_SUBBUF_DIED) {
			finish_consuming_dead_subbuffer(buf);
			break;
		}

		/* write data to file */
		result = patient_write(buf->file_fd, buf->mem + (buf->consumed_old & (buf->n_subbufs * buf->subbuf_size-1)), buf->subbuf_size);
		if(result == -1) {
			PERROR("write");
			/* FIXME: maybe drop this trace */
		}

		/* put the subbuffer */
		result = put_subbuffer(buf);
		if(result == -1) {
			ERR("unknown error putting subbuffer (channel=%s)", buf->name);
			break;
		}
		else if(result == PUT_SUBBUF_PUSHED) {
			ERR("Buffer overflow (channel=%s), reader pushed. This channel will not be usable passed this point.", buf->name);
			break;
		}
		else if(result == PUT_SUBBUF_DIED) {
			WARN("application died while putting subbuffer");
			/* FIXME: probably need to skip the first subbuffer in finish_consuming_dead_subbuffer */
			finish_consuming_dead_subbuffer(buf);
			break;
		}
		else if(result == PUT_SUBBUF_OK) {
		}
	}

	DBG("thread for buffer %s is stopping", buf->name);

	/* FIXME: destroy, unalloc... */

	pthread_cleanup_pop(1);

	return NULL;
}

int create_dir_if_needed(char *dir)
{
	int result;
	result = mkdir(dir, 0777);
	if(result == -1) {
		if(errno != EEXIST) {
			PERROR("mkdir");
			return -1;
		}
	}

	return 0;
}

int is_directory(const char *dir)
{
	int result;
	struct stat st;

	result = stat(dir, &st);
	if(result == -1) {
		PERROR("stat");
		return 0;
	}

	if(!S_ISDIR(st.st_mode)) {
		return 0;
	}

	return 1;
}

int add_buffer(pid_t pid, char *bufname)
{
	struct buffer_info *buf;
	char *send_msg;
	char *received_msg;
	int result;
	char *tmp;
	int fd;
	pthread_t thr;
	struct shmid_ds shmds;

	buf = (struct buffer_info *) malloc(sizeof(struct buffer_info));
	if(buf == NULL) {
		ERR("add_buffer: insufficient memory");
		return -1;
	}

	buf->name = bufname;
	buf->pid = pid;

	/* connect to app */
	result = ustcomm_connect_app(buf->pid, &buf->conn);
	if(result) {
		WARN("unable to connect to process, it probably died before we were able to connect");
		return -1;
	}

	/* get pidunique */
	asprintf(&send_msg, "get_pidunique");
	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
	free(send_msg);
	if(result == -1) {
		ERR("problem in ustcomm_send_request(get_pidunique)");
		return -1;
	}

	result = sscanf(received_msg, "%lld", &buf->pidunique);
	if(result != 1) {
		ERR("unable to parse response to get_pidunique");
		return -1;
	}
	free(received_msg);
	DBG("got pidunique %lld", buf->pidunique);

	/* get shmid */
	asprintf(&send_msg, "get_shmid %s", buf->name);
	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
	free(send_msg);
	if(result == -1) {
		ERR("problem in ustcomm_send_request(get_shmid)");
		return -1;
	}

	result = sscanf(received_msg, "%d %d", &buf->shmid, &buf->bufstruct_shmid);
	if(result != 2) {
		ERR("unable to parse response to get_shmid");
		return -1;
	}
	free(received_msg);
	DBG("got shmids %d %d", buf->shmid, buf->bufstruct_shmid);

	/* get n_subbufs */
	asprintf(&send_msg, "get_n_subbufs %s", buf->name);
	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
	free(send_msg);
	if(result == -1) {
		ERR("problem in ustcomm_send_request(g_n_subbufs)");
		return -1;
	}

	result = sscanf(received_msg, "%d", &buf->n_subbufs);
	if(result != 1) {
		ERR("unable to parse response to get_n_subbufs");
		return -1;
	}
	free(received_msg);
	DBG("got n_subbufs %d", buf->n_subbufs);

	/* get subbuf size */
	asprintf(&send_msg, "get_subbuf_size %s", buf->name);
	ustcomm_send_request(&buf->conn, send_msg, &received_msg);
	free(send_msg);

	result = sscanf(received_msg, "%d", &buf->subbuf_size);
	if(result != 1) {
		ERR("unable to parse response to get_subbuf_size");
		return -1;
	}
	free(received_msg);
	DBG("got subbuf_size %d", buf->subbuf_size);

	/* attach memory */
	buf->mem = shmat(buf->shmid, NULL, 0);
	if(buf->mem == (void *) 0) {
		PERROR("shmat");
		return -1;
	}
	DBG("successfully attached buffer memory");

	buf->bufstruct_mem = shmat(buf->bufstruct_shmid, NULL, 0);
	if(buf->bufstruct_mem == (void *) 0) {
		PERROR("shmat");
		return -1;
	}
	DBG("successfully attached buffer bufstruct memory");

	/* obtain info on the memory segment */
	result = shmctl(buf->shmid, IPC_STAT, &shmds);
	if(result == -1) {
		PERROR("shmctl");
		return -1;
	}
	buf->memlen = shmds.shm_segsz;

	/* open file for output */
	if(!trace_path) {
		/* Only create the directory if using the default path, because
		 * of the risk of typo when using trace path override. We don't
		 * want to risk creating plenty of useless directories in that case.
		 */
		result = create_dir_if_needed(USTD_DEFAULT_TRACE_PATH);
		if(result == -1) {
			ERR("could not create directory %s", USTD_DEFAULT_TRACE_PATH);
			return -1;
		}

		trace_path = USTD_DEFAULT_TRACE_PATH;
	}

	asprintf(&tmp, "%s/%u_%lld", trace_path, buf->pid, buf->pidunique);
	result = create_dir_if_needed(tmp);
	if(result == -1) {
		ERR("could not create directory %s", tmp);
		free(tmp);
		return -1;
	}
	free(tmp);

	asprintf(&tmp, "%s/%u_%lld/%s_0", trace_path, buf->pid, buf->pidunique, buf->name);
	result = fd = open(tmp, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 00600);
	if(result == -1) {
		PERROR("open");
		ERR("failed opening trace file %s", tmp);
		return -1;
	}
	buf->file_fd = fd;
	free(tmp);

	pthread_mutex_lock(&active_buffers_mutex);
	active_buffers++;
	pthread_mutex_unlock(&active_buffers_mutex);

	pthread_create(&thr, NULL, consumer_thread, buf);

	return 0;
}

void usage(void)
{
	fprintf(stderr, "Usage:\nustd OPTIONS\n\nOptions:\n"
			"\t-h\t\tDisplay this usage.\n"
			"\t-o DIR\t\tSpecify the directory where to output the traces.\n"
			"\t-s PATH\t\tSpecify the path to use for the daemon socket.\n");
}

int parse_args(int argc, char **argv)
{
	int c;

	while (1) {
		int option_index = 0;
		static struct option long_options[] = {
			{"help", 0, 0, 'h'},
			{"version", 0, 0, 'V'},
			{0, 0, 0, 0}
		};

		c = getopt_long(argc, argv, "hs:o:", long_options, &option_index);
		if (c == -1)
			break;

		switch (c) {
		case 0:
			printf("option %s", long_options[option_index].name);
			if (optarg)
				printf(" with arg %s", optarg);
			printf("\n");
			break;
		case 's':
			sock_path = optarg;
			break;
		case 'o':
			trace_path = optarg;
			if(!is_directory(trace_path)) {
				ERR("Not a valid directory. (%s)", trace_path);
				return -1;
			}
			break;
		case 'h':
			usage();
			exit(0);
		case 'V':
			printf("Version 0.0\n");
			break;

		default:
			/* unknown option or other error; error is
			printed by getopt, just return */
			return -1;
		}
	}

	return 0;
}

void sigterm_handler(int sig)
{
	terminate_req = 1;
}

int main(int argc, char **argv)
{
	struct ustcomm_ustd ustd;
	int result;
	sigset_t sigset;
	struct sigaction sa;

	result = sigemptyset(&sigset);
	if(result == -1) {
		PERROR("sigemptyset");
		return 1;
	}
	sa.sa_handler = sigterm_handler;
	sa.sa_mask = sigset;
	sa.sa_flags = SA_RESTART;
	result = sigaction(SIGTERM, &sa, NULL);
	if(result == -1) {
		PERROR("sigaction");
		return 1;
	}

	result = parse_args(argc, argv);
	if(result == -1) {
		exit(1);
	}

	result = ustcomm_init_ustd(&ustd, sock_path);
	if(result == -1) {
		ERR("failed to initialize socket");
		return 1;
	}

	/* setup handler for SIGPIPE */
	result = sigemptyset(&sigset);
	if(result == -1) {
		PERROR("sigemptyset");
		return 1;
	}
	result = sigaddset(&sigset, SIGPIPE);
	if(result == -1) {
		PERROR("sigaddset");
		return 1;
	}
	result = sigprocmask(SIG_BLOCK, &sigset, NULL);
	if(result == -1) {
		PERROR("sigprocmask");
		return 1;
	}

	/* app loop */
	for(;;) {
		char *recvbuf;

		/* check for requests on our public socket */
		result = ustcomm_ustd_recv_message(&ustd, &recvbuf, NULL, 100);
		if(result == -1) {
			ERR("error in ustcomm_ustd_recv_message");
			continue;
		}
		if(result > 0) {
			if(!strncmp(recvbuf, "collect", 7)) {
				pid_t pid;
				char *bufname;
				int result;

				result = sscanf(recvbuf, "%*s %d %50as", &pid, &bufname);
				if(result != 2) {
					fprintf(stderr, "parsing error: %s\n", recvbuf);
				}

				result = add_buffer(pid, bufname);
				if(result < 0) {
					ERR("error in add_buffer");
					continue;
				}
			}

			free(recvbuf);
		}

		if(terminate_req) {
			pthread_mutex_lock(&active_buffers_mutex);
			if(active_buffers == 0) {
				pthread_mutex_unlock(&active_buffers_mutex);
				break;
			}
			pthread_mutex_unlock(&active_buffers_mutex);
		}
	}

	return 0;
}
Commit	Line	Data
c39c72ee	1	/* Copyright (C) 2009 Pierre-Marc Fournier
1f8b0dff	2	*
c39c72ee PMF	3	* This library is free software; you can redistribute it and/or
	4	* modify it under the terms of the GNU Lesser General Public
	5	* License as published by the Free Software Foundation; either
	6	* version 2.1 of the License, or (at your option) any later version.
1f8b0dff	7	*
c39c72ee	8	* This library is distributed in the hope that it will be useful,
1f8b0dff	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
c39c72ee PMF	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
c39c72ee PMF	11	* Lesser General Public License for more details.
1f8b0dff	12	*
c39c72ee PMF	13	* You should have received a copy of the GNU Lesser General Public
	14	* License along with this library; if not, write to the Free Software
	15	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
1f8b0dff PMF	16	*/
1f8b0dff PMF	17
3796af9b PMF	18	#define _GNU_SOURCE
	19
	20	#include <sys/types.h>
cd226f25	21	#include <sys/stat.h>
3796af9b	22	#include <sys/shm.h>
688760ef PMF	23	#include <fcntl.h>
688760ef PMF	24	#include <unistd.h>
3a7b90de	25	#include <pthread.h>
a3cdd4a7	26	#include <signal.h>
3796af9b PMF	27
	28	#include <stdlib.h>
	29	#include <stdio.h>
	30	#include <string.h>
a3cdd4a7 PMF	31	#include <errno.h>
a3cdd4a7 PMF	32	#include <assert.h>
cd226f25	33	#include <getopt.h>
3796af9b	34
0b0cd937	35	#include "ustd.h"
3796af9b PMF	36	#include "localerr.h"
3796af9b PMF	37	#include "ustcomm.h"
8bf5ab2d	38	#include "share.h"
3796af9b	39
3a7b90de PMF	40	/* return value: 0 = subbuffer is finished, it won't produce data anymore
	41	* 1 = got subbuffer successfully
	42	* <0 = error
	43	*/
3796af9b	44
8cefc145 PMF	45	#define GET_SUBBUF_OK 1
	46	#define GET_SUBBUF_DONE 0
	47	#define GET_SUBBUF_DIED 2
	48
a3cdd4a7 PMF	49	#define PUT_SUBBUF_OK 1
	50	#define PUT_SUBBUF_DIED 0
	51	#define PUT_SUBBUF_PUSHED 2
	52
c97d4437	53	char *sock_path=NULL;
cd226f25 PMF	54	char *trace_path=NULL;
cd226f25 PMF	55
3158b808 PMF	56	/* Number of active buffers and the mutex to protect it. */
	57	int active_buffers = 0;
	58	pthread_mutex_t active_buffers_mutex = PTHREAD_MUTEX_INITIALIZER;
	59	/* Whether a request to end the program was received. */
	60	sig_atomic_t terminate_req = 0;
	61
688760ef PMF	62	int get_subbuffer(struct buffer_info *buf)
688760ef PMF	63	{
ab805ccd PMF	64	char *send_msg=NULL;
	65	char *received_msg=NULL;
	66	char *rep_code=NULL;
688760ef PMF	67	int retval;
	68	int result;
	69
	70	asprintf(&send_msg, "get_subbuffer %s", buf->name);
3bb56863	71	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
409e2abe PMF	72	if(result == -1 && errno == EPIPE \|\| result == 0) {
	73	DBG("app died while being traced");
	74	retval = GET_SUBBUF_DIED;
ab805ccd	75	goto end;
a3cdd4a7 PMF	76	}
a3cdd4a7 PMF	77	else if(result < 0) {
3bb56863	78	ERR("get_subbuffer: ustcomm_send_request failed");
ab805ccd PMF	79	retval = -1;
ab805ccd PMF	80	goto end;
688760ef	81	}
688760ef PMF	82
688760ef PMF	83	result = sscanf(received_msg, "%as %ld", &rep_code, &buf->consumed_old);
3a7b90de	84	if(result != 2 && result != 1) {
688760ef	85	ERR("unable to parse response to get_subbuffer");
ab805ccd PMF	86	retval = -1;
ab805ccd PMF	87	goto end_rep;
688760ef	88	}
3a7b90de PMF	89
3a7b90de PMF	90	DBG("received msg is %s", received_msg);
688760ef PMF	91
	92	if(!strcmp(rep_code, "OK")) {
	93	DBG("got subbuffer %s", buf->name);
8cefc145	94	retval = GET_SUBBUF_OK;
688760ef	95	}
3a7b90de	96	else if(nth_token_is(received_msg, "END", 0) == 1) {
ab805ccd PMF	97	retval = GET_SUBBUF_DONE;
ab805ccd PMF	98	goto end_rep;
3a7b90de	99	}
688760ef	100	else {
3a7b90de PMF	101	DBG("error getting subbuffer %s", buf->name);
3a7b90de PMF	102	retval = -1;
688760ef PMF	103	}
688760ef PMF	104
3a7b90de	105	/* FIMXE: free correctly the stuff */
ab805ccd PMF	106	end_rep:
	107	if(rep_code)
	108	free(rep_code);
	109	end:
	110	if(send_msg)
	111	free(send_msg);
	112	if(received_msg)
	113	free(received_msg);
	114
688760ef PMF	115	return retval;
	116	}
	117
	118	int put_subbuffer(struct buffer_info *buf)
	119	{
ab805ccd PMF	120	char *send_msg=NULL;
	121	char *received_msg=NULL;
	122	char *rep_code=NULL;
688760ef PMF	123	int retval;
	124	int result;
	125
	126	asprintf(&send_msg, "put_subbuffer %s %ld", buf->name, buf->consumed_old);
3bb56863	127	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
ab805ccd PMF	128	if(result < 0 && errno == ECONNRESET) {
	129	retval = PUT_SUBBUF_DIED;
	130	goto end;
	131	}
688760ef PMF	132	if(result < 0) {
688760ef PMF	133	ERR("put_subbuffer: send_message failed");
ab805ccd PMF	134	retval = -1;
ab805ccd PMF	135	goto end;
688760ef	136	}
688760ef PMF	137
	138	result = sscanf(received_msg, "%as", &rep_code);
	139	if(result != 1) {
	140	ERR("unable to parse response to put_subbuffer");
ab805ccd PMF	141	retval = -1;
ab805ccd PMF	142	goto end_rep;
688760ef	143	}
688760ef PMF	144
	145	if(!strcmp(rep_code, "OK")) {
	146	DBG("subbuffer put %s", buf->name);
a3cdd4a7	147	retval = PUT_SUBBUF_OK;
688760ef PMF	148	}
688760ef PMF	149	else {
a3cdd4a7	150	DBG("put_subbuffer: received error, we were pushed");
ab805ccd PMF	151	retval = PUT_SUBBUF_PUSHED;
ab805ccd PMF	152	goto end_rep;
688760ef PMF	153	}
688760ef PMF	154
ab805ccd PMF	155	end_rep:
	156	if(rep_code)
	157	free(rep_code);
	158
	159	end:
	160	if(send_msg)
	161	free(send_msg);
	162	if(received_msg)
	163	free(received_msg);
	164
688760ef PMF	165	return retval;
	166	}
	167
3158b808 PMF	168	void decrement_active_buffers(void *arg)
	169	{
	170	pthread_mutex_lock(&active_buffers_mutex);
	171	active_buffers--;
	172	pthread_mutex_unlock(&active_buffers_mutex);
	173	}
	174
3a7b90de PMF	175	void consumer_thread(void arg)
	176	{
	177	struct buffer_info buf = (struct buffer_info ) arg;
	178	int result;
	179
3158b808 PMF	180	pthread_cleanup_push(decrement_active_buffers, NULL);
3158b808 PMF	181
3a7b90de	182	for(;;) {
8cefc145	183	/* get the subbuffer */
0b0cd937 PMF	184	result = get_subbuffer(buf);
	185	if(result == -1) {
	186	ERR("error getting subbuffer");
	187	continue;
3a7b90de	188	}
0b0cd937 PMF	189	else if(result == GET_SUBBUF_DONE) {
	190	/* this is done */
	191	break;
	192	}
	193	else if(result == GET_SUBBUF_DIED) {
	194	finish_consuming_dead_subbuffer(buf);
	195	break;
3a7b90de PMF	196	}
	197
	198	/* write data to file */
	199	result = patient_write(buf->file_fd, buf->mem + (buf->consumed_old & (buf->n_subbufs * buf->subbuf_size-1)), buf->subbuf_size);
	200	if(result == -1) {
	201	PERROR("write");
	202	/* FIXME: maybe drop this trace */
	203	}
	204
8cefc145	205	/* put the subbuffer */
0b0cd937 PMF	206	result = put_subbuffer(buf);
0b0cd937 PMF	207	if(result == -1) {
a3cdd4a7 PMF	208	ERR("unknown error putting subbuffer (channel=%s)", buf->name);
	209	break;
	210	}
	211	else if(result == PUT_SUBBUF_PUSHED) {
	212	ERR("Buffer overflow (channel=%s), reader pushed. This channel will not be usable passed this point.", buf->name);
0b0cd937	213	break;
3a7b90de	214	}
a3cdd4a7 PMF	215	else if(result == PUT_SUBBUF_DIED) {
	216	WARN("application died while putting subbuffer");
	217	/* FIXME: probably need to skip the first subbuffer in finish_consuming_dead_subbuffer */
	218	finish_consuming_dead_subbuffer(buf);
9f654956	219	break;
a3cdd4a7 PMF	220	}
	221	else if(result == PUT_SUBBUF_OK) {
	222	}
3a7b90de PMF	223	}
	224
	225	DBG("thread for buffer %s is stopping", buf->name);
	226
8cefc145 PMF	227	/* FIXME: destroy, unalloc... */
8cefc145 PMF	228
3158b808 PMF	229	pthread_cleanup_pop(1);
3158b808 PMF	230
3a7b90de PMF	231	return NULL;
	232	}
	233
72ebd39a PMF	234	int create_dir_if_needed(char *dir)
	235	{
	236	int result;
	237	result = mkdir(dir, 0777);
	238	if(result == -1) {
	239	if(errno != EEXIST) {
4d70f833	240	PERROR("mkdir");
72ebd39a PMF	241	return -1;
	242	}
	243	}
	244
	245	return 0;
	246	}
	247
cd226f25 PMF	248	int is_directory(const char *dir)
	249	{
	250	int result;
	251	struct stat st;
	252
	253	result = stat(dir, &st);
	254	if(result == -1) {
	255	PERROR("stat");
	256	return 0;
	257	}
	258
	259	if(!S_ISDIR(st.st_mode)) {
	260	return 0;
	261	}
	262
	263	return 1;
	264	}
	265
3a7b90de PMF	266	int add_buffer(pid_t pid, char *bufname)
	267	{
	268	struct buffer_info *buf;
	269	char *send_msg;
	270	char *received_msg;
	271	int result;
	272	char *tmp;
	273	int fd;
	274	pthread_t thr;
a3cdd4a7	275	struct shmid_ds shmds;
3a7b90de PMF	276
	277	buf = (struct buffer_info *) malloc(sizeof(struct buffer_info));
	278	if(buf == NULL) {
	279	ERR("add_buffer: insufficient memory");
	280	return -1;
	281	}
	282
	283	buf->name = bufname;
	284	buf->pid = pid;
	285
4e2a8808 PMF	286	/* connect to app */
	287	result = ustcomm_connect_app(buf->pid, &buf->conn);
	288	if(result) {
a3cdd4a7	289	WARN("unable to connect to process, it probably died before we were able to connect");
4e2a8808 PMF	290	return -1;
	291	}
	292
ed1317e7 PMF	293	/* get pidunique */
	294	asprintf(&send_msg, "get_pidunique");
	295	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
	296	free(send_msg);
	297	if(result == -1) {
	298	ERR("problem in ustcomm_send_request(get_pidunique)");
	299	return -1;
	300	}
	301
	302	result = sscanf(received_msg, "%lld", &buf->pidunique);
	303	if(result != 1) {
	304	ERR("unable to parse response to get_pidunique");
	305	return -1;
	306	}
	307	free(received_msg);
	308	DBG("got pidunique %lld", buf->pidunique);
	309
3a7b90de PMF	310	/* get shmid */
3a7b90de PMF	311	asprintf(&send_msg, "get_shmid %s", buf->name);
a3cdd4a7	312	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
3a7b90de	313	free(send_msg);
a3cdd4a7 PMF	314	if(result == -1) {
	315	ERR("problem in ustcomm_send_request(get_shmid)");
	316	return -1;
	317	}
3a7b90de	318
8cefc145 PMF	319	result = sscanf(received_msg, "%d %d", &buf->shmid, &buf->bufstruct_shmid);
8cefc145 PMF	320	if(result != 2) {
3a7b90de PMF	321	ERR("unable to parse response to get_shmid");
	322	return -1;
	323	}
	324	free(received_msg);
8cefc145	325	DBG("got shmids %d %d", buf->shmid, buf->bufstruct_shmid);
3a7b90de PMF	326
	327	/* get n_subbufs */
	328	asprintf(&send_msg, "get_n_subbufs %s", buf->name);
a3cdd4a7	329	result = ustcomm_send_request(&buf->conn, send_msg, &received_msg);
3a7b90de	330	free(send_msg);
a3cdd4a7 PMF	331	if(result == -1) {
	332	ERR("problem in ustcomm_send_request(g_n_subbufs)");
	333	return -1;
	334	}
3a7b90de PMF	335
	336	result = sscanf(received_msg, "%d", &buf->n_subbufs);
	337	if(result != 1) {
	338	ERR("unable to parse response to get_n_subbufs");
	339	return -1;
	340	}
	341	free(received_msg);
	342	DBG("got n_subbufs %d", buf->n_subbufs);
	343
	344	/* get subbuf size */
	345	asprintf(&send_msg, "get_subbuf_size %s", buf->name);
4e2a8808	346	ustcomm_send_request(&buf->conn, send_msg, &received_msg);
3a7b90de PMF	347	free(send_msg);
	348
	349	result = sscanf(received_msg, "%d", &buf->subbuf_size);
	350	if(result != 1) {
	351	ERR("unable to parse response to get_subbuf_size");
	352	return -1;
	353	}
	354	free(received_msg);
	355	DBG("got subbuf_size %d", buf->subbuf_size);
	356
	357	/* attach memory */
	358	buf->mem = shmat(buf->shmid, NULL, 0);
	359	if(buf->mem == (void *) 0) {
4d70f833	360	PERROR("shmat");
3a7b90de PMF	361	return -1;
3a7b90de PMF	362	}
8cefc145 PMF	363	DBG("successfully attached buffer memory");
	364
	365	buf->bufstruct_mem = shmat(buf->bufstruct_shmid, NULL, 0);
	366	if(buf->bufstruct_mem == (void *) 0) {
4d70f833	367	PERROR("shmat");
8cefc145 PMF	368	return -1;
	369	}
	370	DBG("successfully attached buffer bufstruct memory");
3a7b90de	371
a3cdd4a7 PMF	372	/* obtain info on the memory segment */
	373	result = shmctl(buf->shmid, IPC_STAT, &shmds);
	374	if(result == -1) {
4d70f833	375	PERROR("shmctl");
a3cdd4a7 PMF	376	return -1;
	377	}
	378	buf->memlen = shmds.shm_segsz;
	379
3a7b90de	380	/* open file for output */
cd226f25 PMF	381	if(!trace_path) {
	382	/* Only create the directory if using the default path, because
	383	* of the risk of typo when using trace path override. We don't
	384	* want to risk creating plenty of useless directories in that case.
	385	*/
	386	result = create_dir_if_needed(USTD_DEFAULT_TRACE_PATH);
	387	if(result == -1) {
	388	ERR("could not create directory %s", USTD_DEFAULT_TRACE_PATH);
	389	return -1;
	390	}
	391
	392	trace_path = USTD_DEFAULT_TRACE_PATH;
72ebd39a PMF	393	}
72ebd39a PMF	394
ed1317e7	395	asprintf(&tmp, "%s/%u_%lld", trace_path, buf->pid, buf->pidunique);
72ebd39a PMF	396	result = create_dir_if_needed(tmp);
	397	if(result == -1) {
	398	ERR("could not create directory %s", tmp);
	399	free(tmp);
	400	return -1;
	401	}
	402	free(tmp);
	403
ed1317e7 PMF	404	asprintf(&tmp, "%s/%u_%lld/%s_0", trace_path, buf->pid, buf->pidunique, buf->name);
ed1317e7 PMF	405	result = fd = open(tmp, O_WRONLY \| O_CREAT \| O_TRUNC \| O_EXCL, 00600);
3a7b90de PMF	406	if(result == -1) {
3a7b90de PMF	407	PERROR("open");
6cb88bc0	408	ERR("failed opening trace file %s", tmp);
3a7b90de PMF	409	return -1;
	410	}
	411	buf->file_fd = fd;
	412	free(tmp);
	413
3158b808 PMF	414	pthread_mutex_lock(&active_buffers_mutex);
	415	active_buffers++;
	416	pthread_mutex_unlock(&active_buffers_mutex);
	417
3a7b90de PMF	418	pthread_create(&thr, NULL, consumer_thread, buf);
	419
	420	return 0;
	421	}
	422
cd226f25 PMF	423	void usage(void)
	424	{
	425	fprintf(stderr, "Usage:\nustd OPTIONS\n\nOptions:\n"
	426	"\t-h\t\tDisplay this usage.\n"
	427	"\t-o DIR\t\tSpecify the directory where to output the traces.\n"
	428	"\t-s PATH\t\tSpecify the path to use for the daemon socket.\n");
	429	}
	430
	431	int parse_args(int argc, char **argv)
	432	{
	433	int c;
	434
	435	while (1) {
	436	int option_index = 0;
	437	static struct option long_options[] = {
	438	{"help", 0, 0, 'h'},
	439	{"version", 0, 0, 'V'},
	440	{0, 0, 0, 0}
	441	};
	442
	443	c = getopt_long(argc, argv, "hs:o:", long_options, &option_index);
	444	if (c == -1)
	445	break;
	446
	447	switch (c) {
	448	case 0:
	449	printf("option %s", long_options[option_index].name);
	450	if (optarg)
	451	printf(" with arg %s", optarg);
	452	printf("\n");
	453	break;
	454	case 's':
	455	sock_path = optarg;
	456	break;
	457	case 'o':
	458	trace_path = optarg;
	459	if(!is_directory(trace_path)) {
	460	ERR("Not a valid directory. (%s)", trace_path);
	461	return -1;
	462	}
	463	break;
	464	case 'h':
	465	usage();
	466	exit(0);
	467	case 'V':
	468	printf("Version 0.0\n");
	469	break;
	470
	471	default:
	472	/* unknown option or other error; error is
	473	printed by getopt, just return */
	474	return -1;
	475	}
	476	}
	477
	478	return 0;
	479	}
	480
3158b808 PMF	481	void sigterm_handler(int sig)
	482	{
	483	terminate_req = 1;
	484	}
	485
3796af9b PMF	486	int main(int argc, char **argv)
	487	{
	488	struct ustcomm_ustd ustd;
	489	int result;
a3cdd4a7	490	sigset_t sigset;
3158b808 PMF	491	struct sigaction sa;
	492
	493	result = sigemptyset(&sigset);
	494	if(result == -1) {
4d70f833	495	PERROR("sigemptyset");
3158b808 PMF	496	return 1;
	497	}
	498	sa.sa_handler = sigterm_handler;
	499	sa.sa_mask = sigset;
	500	sa.sa_flags = SA_RESTART;
	501	result = sigaction(SIGTERM, &sa, NULL);
	502	if(result == -1) {
	503	PERROR("sigaction");
	504	return 1;
	505	}
3796af9b	506
cd226f25 PMF	507	result = parse_args(argc, argv);
	508	if(result == -1) {
	509	exit(1);
	510	}
	511
	512	result = ustcomm_init_ustd(&ustd, sock_path);
3796af9b PMF	513	if(result == -1) {
	514	ERR("failed to initialize socket");
	515	return 1;
	516	}
	517
3158b808	518	/* setup handler for SIGPIPE */
a3cdd4a7 PMF	519	result = sigemptyset(&sigset);
a3cdd4a7 PMF	520	if(result == -1) {
4d70f833	521	PERROR("sigemptyset");
a3cdd4a7 PMF	522	return 1;
	523	}
	524	result = sigaddset(&sigset, SIGPIPE);
	525	if(result == -1) {
4d70f833	526	PERROR("sigaddset");
a3cdd4a7 PMF	527	return 1;
	528	}
	529	result = sigprocmask(SIG_BLOCK, &sigset, NULL);
	530	if(result == -1) {
4d70f833	531	PERROR("sigprocmask");
a3cdd4a7 PMF	532	return 1;
	533	}
	534
688760ef	535	/* app loop */
3796af9b PMF	536	for(;;) {
	537	char *recvbuf;
	538
3a7b90de	539	/* check for requests on our public socket */
688760ef PMF	540	result = ustcomm_ustd_recv_message(&ustd, &recvbuf, NULL, 100);
	541	if(result == -1) {
	542	ERR("error in ustcomm_ustd_recv_message");
	543	continue;
	544	}
	545	if(result > 0) {
	546	if(!strncmp(recvbuf, "collect", 7)) {
	547	pid_t pid;
	548	char *bufname;
	549	int result;
3796af9b	550
688760ef PMF	551	result = sscanf(recvbuf, "%*s %d %50as", &pid, &bufname);
	552	if(result != 2) {
	553	fprintf(stderr, "parsing error: %s\n", recvbuf);
	554	}
3796af9b	555
688760ef PMF	556	result = add_buffer(pid, bufname);
	557	if(result < 0) {
	558	ERR("error in add_buffer");
	559	continue;
	560	}
3796af9b PMF	561	}
3796af9b PMF	562
688760ef	563	free(recvbuf);
3796af9b	564	}
3158b808 PMF	565
	566	if(terminate_req) {
	567	pthread_mutex_lock(&active_buffers_mutex);
	568	if(active_buffers == 0) {
	569	pthread_mutex_unlock(&active_buffers_mutex);
	570	break;
	571	}
	572	pthread_mutex_unlock(&active_buffers_mutex);
	573	}
3796af9b PMF	574	}
	575
	576	return 0;
	577	}