[babeltrace.git] / converter / babeltrace.c

/*
 * babeltrace.c
 *
 * Babeltrace Trace Converter
 *
 * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
 *
 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 */

#define _XOPEN_SOURCE 700
#include <config.h>
#include <babeltrace/babeltrace-internal.h>
#include <babeltrace/format.h>
#include <popt.h>
#include <errno.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <ftw.h>
#include <dirent.h>
#include <unistd.h>

#define DEFAULT_FILE_ARRAY_SIZE	1
static char *opt_input_format;
static char *opt_output_format;

static const char *opt_input_path;
static const char *opt_output_path;

static struct trace_collection trace_collection_read;
static struct format *fmt_read;

void strlower(char *str)
{
	while (*str) {
		*str = tolower(*str);
		str++;
	}
}

enum {
	OPT_NONE = 0,
	OPT_HELP,
	OPT_LIST,
	OPT_VERBOSE,
	OPT_DEBUG,
	OPT_NAMES,
};

static struct poptOption long_options[] = {
	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	{ "input-format", 'i', POPT_ARG_STRING, &opt_input_format, OPT_NONE, NULL, NULL },
	{ "output-format", 'o', POPT_ARG_STRING, &opt_output_format, OPT_NONE, NULL, NULL },
	{ "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
	{ "list", 'l', POPT_ARG_NONE, NULL, OPT_LIST, NULL, NULL },
	{ "verbose", 'v', POPT_ARG_NONE, NULL, OPT_VERBOSE, NULL, NULL },
	{ "debug", 'd', POPT_ARG_NONE, NULL, OPT_DEBUG, NULL, NULL },
	{ "names", 'n', POPT_ARG_STRING, NULL, OPT_NAMES, NULL, NULL },
	{ NULL, 0, 0, NULL, 0, NULL, NULL },
};

static void list_formats(FILE *fp)
{
	fprintf(fp, "\n");
	bt_fprintf_format_list(fp);
}

static void usage(FILE *fp)
{
	fprintf(fp, "BabelTrace Trace Converter %s\n\n", VERSION);
	fprintf(fp, "usage : babeltrace [OPTIONS] INPUT <OUTPUT>\n");
	fprintf(fp, "\n");
	fprintf(fp, "  INPUT                          Input trace path\n");
	fprintf(fp, "  OUTPUT                         Output trace path (default: stdout)\n");
	fprintf(fp, "\n");
	fprintf(fp, "  -i, --input-format FORMAT      Input trace format (default: ctf)\n");
	fprintf(fp, "  -o, --output-format FORMAT     Output trace format (default: text)\n");
	fprintf(fp, "\n");
	fprintf(fp, "  -h, --help                     This help message\n");
	fprintf(fp, "  -l, --list                     List available formats\n");
	fprintf(fp, "  -v, --verbose                  Verbose mode\n");
	fprintf(fp, "                                 (or set BABELTRACE_VERBOSE environment variable)\n");
	fprintf(fp, "  -d, --debug                    Debug mode\n");
	fprintf(fp, "                                 (or set BABELTRACE_DEBUG environment variable)\n");
	fprintf(fp, "  -n, --names name1<,name2,...>  Print field names.\n");
	fprintf(fp, "                                 Available field names:\n");
	fprintf(fp, "                                     (payload OR args OR arg)\n");
	fprintf(fp, "                                     all, scope, header, (context OR ctx)\n");
	fprintf(fp, "                                     trace, trace:domain, trace:procname, trace:vpid,\n");
	fprintf(fp, "                                     loglevel.\n");
	fprintf(fp, "                                        (payload active by default)\n");
	list_formats(fp);
	fprintf(fp, "\n");
}

static int get_names_args(poptContext *pc)
{
	char *str, *strlist, *strctx;

	opt_payload_field_names = 0;
	strlist = (char *) poptGetOptArg(*pc);
	if (!strlist) {
		return -EINVAL;
	}
	str = strtok_r(strlist, ",", &strctx);
	do {
		if (!strcmp(str, "all"))
			opt_all_field_names = 1;
		else if (!strcmp(str, "scope"))
			opt_scope_field_names = 1;
		else if (!strcmp(str, "context") || !strcmp(str, "ctx"))
			opt_context_field_names = 1;
		else if (!strcmp(str, "header"))
			opt_header_field_names = 1;
		else if (!strcmp(str, "payload") || !strcmp(str, "args") || !strcmp(str, "arg"))
			opt_payload_field_names = 1;
		else if (!strcmp(str, "trace"))
			opt_trace_name = 1;
		else if (!strcmp(str, "trace:domain"))
			opt_trace_domain = 1;
		else if (!strcmp(str, "trace:procname"))
			opt_trace_procname = 1;
		else if (!strcmp(str, "trace:vpid"))
			opt_trace_vpid = 1;
		else if (!strcmp(str, "loglevel"))
			opt_loglevel = 1;
		else {
			fprintf(stdout, "[error] unknown field name type %s\n", str);
			return -EINVAL;
		}
	} while ((str = strtok_r(NULL, ",", &strctx)));
	return 0;
}

/*
 * Return 0 if caller should continue, < 0 if caller should return
 * error, > 0 if caller should exit without reporting error.
 */
static int parse_options(int argc, char **argv)
{
	poptContext pc;
	int opt, ret = 0;

	if (argc == 1) {
		usage(stdout);
		return 1;	/* exit cleanly */
	}

	pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
	poptReadDefaultConfig(pc, 0);

	/* set default */
	opt_payload_field_names = 1;

	while ((opt = poptGetNextOpt(pc)) != -1) {
		switch (opt) {
		case OPT_HELP:
			usage(stdout);
			ret = 1;	/* exit cleanly */
			goto end;
		case OPT_LIST:
			list_formats(stdout);
			ret = 1;
			goto end;
		case OPT_VERBOSE:
			babeltrace_verbose = 1;
			break;
		case OPT_NAMES:
			if (get_names_args(&pc)) {
				ret = -EINVAL;
				goto end;
			}
			break;
		case OPT_DEBUG:
			babeltrace_debug = 1;
			break;
		default:
			ret = -EINVAL;
			goto end;
		}
	}

	opt_input_path = poptGetArg(pc);
	if (!opt_input_path) {
		ret = -EINVAL;
		goto end;
	}
	opt_output_path = poptGetArg(pc);

end:
	if (pc) {
		poptFreeContext(pc);
	}
	return ret;
}

static void init_trace_collection(struct trace_collection *tc)
{
	tc->array = g_ptr_array_sized_new(DEFAULT_FILE_ARRAY_SIZE);
}

/*
 * finalize_trace_collection() closes the opened traces for read
 * and free the memory allocated for trace collection
 */
static void finalize_trace_collection(struct trace_collection *tc)
{
	int i;

	for (i = 0; i < tc->array->len; i++) {
		struct trace_descriptor *temp =
			g_ptr_array_index(tc->array, i);
		fmt_read->close_trace(temp);
	}
	g_ptr_array_free(tc->array, TRUE);
}

static void trace_collection_add(struct trace_collection *tc,
				 struct trace_descriptor *td)
{
	g_ptr_array_add(tc->array, td);
}

/*
 * traverse_dir() is the callback functiion for File Tree Walk (nftw).
 * it receives the path of the current entry (file, dir, link..etc) with
 * a flag to indicate the type of the entry.
 * if the entry being visited is a directory and contains a metadata file,
 * then open it for reading and save a trace_descriptor to that directory
 * in the read trace collection.
 */
static int traverse_dir(const char *fpath, const struct stat *sb,
			int tflag, struct FTW *ftwbuf)
{
	int dirfd;
	int fd;
	struct trace_descriptor *td_read;

	if (tflag != FTW_D)
		return 0;
	dirfd = open(fpath, 0);
	if (dirfd < 0) {
		fprintf(stdout, "[error] unable to open trace "
			"directory file descriptor.\n");
		return -1;
	}
	fd = openat(dirfd, "metadata", O_RDONLY);
	if (fd < 0) {
		close(dirfd);
	} else {
		close(fd);
		close(dirfd);
		td_read = fmt_read->open_trace(opt_input_path,
				fpath, O_RDONLY, ctf_move_pos_slow,
				NULL);
		if (!td_read) {
			fprintf(stdout, "Error opening trace \"%s\" "
					"for reading.\n\n", fpath);
			return -1;	/* error */
		}
		trace_collection_add(&trace_collection_read, td_read);
	}
	return 0;	/* success */
}

int main(int argc, char **argv)
{
	int ret;
	struct format *fmt_write;
	struct trace_descriptor *td_write;

	ret = parse_options(argc, argv);
	if (ret < 0) {
		fprintf(stdout, "Error parsing options.\n\n");
		usage(stdout);
		exit(EXIT_FAILURE);
	} else if (ret > 0) {
		exit(EXIT_SUCCESS);
	}
	printf_verbose("Verbose mode active.\n");
	printf_debug("Debug mode active.\n");

	if (opt_input_format)
		strlower(opt_input_format);
	if (opt_output_format)
		strlower(opt_output_format);

	printf_verbose("Converting from directory: %s\n", opt_input_path);
	printf_verbose("Converting from format: %s\n",
		opt_input_format ? : "ctf <default>");
	printf_verbose("Converting to directory: %s\n",
		opt_output_path ? : "<stdout>");
	printf_verbose("Converting to format: %s\n",
		opt_output_format ? : "text <default>");

	if (!opt_input_format)
		opt_input_format = "ctf";
	if (!opt_output_format)
		opt_output_format = "text";
	fmt_read = bt_lookup_format(g_quark_from_static_string(opt_input_format));
	if (!fmt_read) {
		fprintf(stdout, "[error] Format \"%s\" is not supported.\n\n",
			opt_input_format);
		exit(EXIT_FAILURE);
	}
	fmt_write = bt_lookup_format(g_quark_from_static_string(opt_output_format));
	if (!fmt_write) {
		fprintf(stdout, "[error] format \"%s\" is not supported.\n\n",
			opt_output_format);
		exit(EXIT_FAILURE);
	}

	/*
	 * pass the input path to nftw() .
	 * specify traverse_dir() as the callback function.
	 * depth = 10 which is the max number of file descriptors
	 * that nftw() can open at a given time.
	 * flags = 0  check nftw documentation for more info .
	 */
	init_trace_collection(&trace_collection_read);
	ret = nftw(opt_input_path, traverse_dir, 10, 0);
	if (ret != 0) {
		fprintf(stdout, "[error] opening trace \"%s\" for reading.\n\n",
			opt_input_path);
		goto error_td_read;
	}
	if (trace_collection_read.array->len == 0) {
		fprintf(stdout, "[warning] no metadata file was found."
						" no output was generated\n");
		return 0;
	}

	td_write = fmt_write->open_trace(NULL, opt_output_path, O_RDWR, NULL, NULL);
	if (!td_write) {
		fprintf(stdout, "Error opening trace \"%s\" for writing.\n\n",
			opt_output_path ? : "<none>");
		goto error_td_write;
	}

	ret = convert_trace(td_write, &trace_collection_read);
	if (ret) {
		fprintf(stdout, "Error printing trace.\n\n");
		goto error_copy_trace;
	}

	fmt_write->close_trace(td_write);
	finalize_trace_collection(&trace_collection_read);
	printf_verbose("finished converting. Output written to:\n%s\n",
			opt_output_path ? : "<stdout>");
	exit(EXIT_SUCCESS);

	/* Error handling */
error_copy_trace:
	fmt_write->close_trace(td_write);
error_td_write:
	finalize_trace_collection(&trace_collection_read);
error_td_read:
	exit(EXIT_FAILURE);
}
Commit	Line	Data
	1	/*
	2	* babeltrace.c
	3	*
	4	* Babeltrace Trace Converter
	5	*
	6	* Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
	7	*
	8	* Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	9	*
	10	* Permission is hereby granted, free of charge, to any person obtaining a copy
	11	* of this software and associated documentation files (the "Software"), to deal
	12	* in the Software without restriction, including without limitation the rights
	13	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	14	* copies of the Software, and to permit persons to whom the Software is
	15	* furnished to do so, subject to the following conditions:
	16	*
	17	* The above copyright notice and this permission notice shall be included in
	18	* all copies or substantial portions of the Software.
	19	*/
	20
	21	#define _XOPEN_SOURCE 700
	22	#include <config.h>
	23	#include <babeltrace/babeltrace-internal.h>
	24	#include <babeltrace/format.h>
	25	#include <popt.h>
	26	#include <errno.h>
	27	#include <stdlib.h>
	28	#include <ctype.h>
	29	#include <sys/stat.h>
	30	#include <sys/types.h>
	31	#include <fcntl.h>
	32	#include <ftw.h>
	33	#include <dirent.h>
	34	#include <unistd.h>
	35
	36	#define DEFAULT_FILE_ARRAY_SIZE 1
	37	static char *opt_input_format;
	38	static char *opt_output_format;
	39
	40	static const char *opt_input_path;
	41	static const char *opt_output_path;
	42
	43	static struct trace_collection trace_collection_read;
	44	static struct format *fmt_read;
	45
	46	void strlower(char *str)
	47	{
	48	while (*str) {
	49	str = tolower(str);
	50	str++;
	51	}
	52	}
	53
	54	enum {
	55	OPT_NONE = 0,
	56	OPT_HELP,
	57	OPT_LIST,
	58	OPT_VERBOSE,
	59	OPT_DEBUG,
	60	OPT_NAMES,
	61	};
	62
	63	static struct poptOption long_options[] = {
	64	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	65	{ "input-format", 'i', POPT_ARG_STRING, &opt_input_format, OPT_NONE, NULL, NULL },
	66	{ "output-format", 'o', POPT_ARG_STRING, &opt_output_format, OPT_NONE, NULL, NULL },
	67	{ "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
	68	{ "list", 'l', POPT_ARG_NONE, NULL, OPT_LIST, NULL, NULL },
	69	{ "verbose", 'v', POPT_ARG_NONE, NULL, OPT_VERBOSE, NULL, NULL },
	70	{ "debug", 'd', POPT_ARG_NONE, NULL, OPT_DEBUG, NULL, NULL },
	71	{ "names", 'n', POPT_ARG_STRING, NULL, OPT_NAMES, NULL, NULL },
	72	{ NULL, 0, 0, NULL, 0, NULL, NULL },
	73	};
	74
	75	static void list_formats(FILE *fp)
	76	{
	77	fprintf(fp, "\n");
	78	bt_fprintf_format_list(fp);
	79	}
	80
	81	static void usage(FILE *fp)
	82	{
	83	fprintf(fp, "BabelTrace Trace Converter %s\n\n", VERSION);
	84	fprintf(fp, "usage : babeltrace [OPTIONS] INPUT <OUTPUT>\n");
	85	fprintf(fp, "\n");
	86	fprintf(fp, " INPUT Input trace path\n");
	87	fprintf(fp, " OUTPUT Output trace path (default: stdout)\n");
	88	fprintf(fp, "\n");
	89	fprintf(fp, " -i, --input-format FORMAT Input trace format (default: ctf)\n");
	90	fprintf(fp, " -o, --output-format FORMAT Output trace format (default: text)\n");
	91	fprintf(fp, "\n");
	92	fprintf(fp, " -h, --help This help message\n");
	93	fprintf(fp, " -l, --list List available formats\n");
	94	fprintf(fp, " -v, --verbose Verbose mode\n");
	95	fprintf(fp, " (or set BABELTRACE_VERBOSE environment variable)\n");
	96	fprintf(fp, " -d, --debug Debug mode\n");
	97	fprintf(fp, " (or set BABELTRACE_DEBUG environment variable)\n");
	98	fprintf(fp, " -n, --names name1<,name2,...> Print field names.\n");
	99	fprintf(fp, " Available field names:\n");
	100	fprintf(fp, " (payload OR args OR arg)\n");
	101	fprintf(fp, " all, scope, header, (context OR ctx)\n");
	102	fprintf(fp, " trace, trace:domain, trace:procname, trace:vpid,\n");
	103	fprintf(fp, " loglevel.\n");
	104	fprintf(fp, " (payload active by default)\n");
	105	list_formats(fp);
	106	fprintf(fp, "\n");
	107	}
	108
	109	static int get_names_args(poptContext *pc)
	110	{
	111	char str, strlist, *strctx;
	112
	113	opt_payload_field_names = 0;
	114	strlist = (char ) poptGetOptArg(pc);
	115	if (!strlist) {
	116	return -EINVAL;
	117	}
	118	str = strtok_r(strlist, ",", &strctx);
	119	do {
	120	if (!strcmp(str, "all"))
	121	opt_all_field_names = 1;
	122	else if (!strcmp(str, "scope"))
	123	opt_scope_field_names = 1;
	124	else if (!strcmp(str, "context") \|\| !strcmp(str, "ctx"))
	125	opt_context_field_names = 1;
	126	else if (!strcmp(str, "header"))
	127	opt_header_field_names = 1;
	128	else if (!strcmp(str, "payload") \|\| !strcmp(str, "args") \|\| !strcmp(str, "arg"))
	129	opt_payload_field_names = 1;
	130	else if (!strcmp(str, "trace"))
	131	opt_trace_name = 1;
	132	else if (!strcmp(str, "trace:domain"))
	133	opt_trace_domain = 1;
	134	else if (!strcmp(str, "trace:procname"))
	135	opt_trace_procname = 1;
	136	else if (!strcmp(str, "trace:vpid"))
	137	opt_trace_vpid = 1;
	138	else if (!strcmp(str, "loglevel"))
	139	opt_loglevel = 1;
	140	else {
	141	fprintf(stdout, "[error] unknown field name type %s\n", str);
	142	return -EINVAL;
	143	}
	144	} while ((str = strtok_r(NULL, ",", &strctx)));
	145	return 0;
	146	}
	147
	148	/*
	149	* Return 0 if caller should continue, < 0 if caller should return
	150	* error, > 0 if caller should exit without reporting error.
	151	*/
	152	static int parse_options(int argc, char **argv)
	153	{
	154	poptContext pc;
	155	int opt, ret = 0;
	156
	157	if (argc == 1) {
	158	usage(stdout);
	159	return 1; /* exit cleanly */
	160	}
	161
	162	pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
	163	poptReadDefaultConfig(pc, 0);
	164
	165	/* set default */
	166	opt_payload_field_names = 1;
	167
	168	while ((opt = poptGetNextOpt(pc)) != -1) {
	169	switch (opt) {
	170	case OPT_HELP:
	171	usage(stdout);
	172	ret = 1; /* exit cleanly */
	173	goto end;
	174	case OPT_LIST:
	175	list_formats(stdout);
	176	ret = 1;
	177	goto end;
	178	case OPT_VERBOSE:
	179	babeltrace_verbose = 1;
	180	break;
	181	case OPT_NAMES:
	182	if (get_names_args(&pc)) {
	183	ret = -EINVAL;
	184	goto end;
	185	}
	186	break;
	187	case OPT_DEBUG:
	188	babeltrace_debug = 1;
	189	break;
	190	default:
	191	ret = -EINVAL;
	192	goto end;
	193	}
	194	}
	195
	196	opt_input_path = poptGetArg(pc);
	197	if (!opt_input_path) {
	198	ret = -EINVAL;
	199	goto end;
	200	}
	201	opt_output_path = poptGetArg(pc);
	202
	203	end:
	204	if (pc) {
	205	poptFreeContext(pc);
	206	}
	207	return ret;
	208	}
	209
	210	static void init_trace_collection(struct trace_collection *tc)
	211	{
	212	tc->array = g_ptr_array_sized_new(DEFAULT_FILE_ARRAY_SIZE);
	213	}
	214
	215	/*
	216	* finalize_trace_collection() closes the opened traces for read
	217	* and free the memory allocated for trace collection
	218	*/
	219	static void finalize_trace_collection(struct trace_collection *tc)
	220	{
	221	int i;
	222
	223	for (i = 0; i < tc->array->len; i++) {
	224	struct trace_descriptor *temp =
	225	g_ptr_array_index(tc->array, i);
	226	fmt_read->close_trace(temp);
	227	}
	228	g_ptr_array_free(tc->array, TRUE);
	229	}
	230
	231	static void trace_collection_add(struct trace_collection *tc,
	232	struct trace_descriptor *td)
	233	{
	234	g_ptr_array_add(tc->array, td);
	235	}
	236
	237	/*
	238	* traverse_dir() is the callback functiion for File Tree Walk (nftw).
	239	* it receives the path of the current entry (file, dir, link..etc) with
	240	* a flag to indicate the type of the entry.
	241	* if the entry being visited is a directory and contains a metadata file,
	242	* then open it for reading and save a trace_descriptor to that directory
	243	* in the read trace collection.
	244	*/
	245	static int traverse_dir(const char fpath, const struct stat sb,
	246	int tflag, struct FTW *ftwbuf)
	247	{
	248	int dirfd;
	249	int fd;
	250	struct trace_descriptor *td_read;
	251
	252	if (tflag != FTW_D)
	253	return 0;
	254	dirfd = open(fpath, 0);
	255	if (dirfd < 0) {
	256	fprintf(stdout, "[error] unable to open trace "
	257	"directory file descriptor.\n");
	258	return -1;
	259	}
	260	fd = openat(dirfd, "metadata", O_RDONLY);
	261	if (fd < 0) {
	262	close(dirfd);
	263	} else {
	264	close(fd);
	265	close(dirfd);
	266	td_read = fmt_read->open_trace(opt_input_path,
	267	fpath, O_RDONLY, ctf_move_pos_slow,
	268	NULL);
	269	if (!td_read) {
	270	fprintf(stdout, "Error opening trace \"%s\" "
	271	"for reading.\n\n", fpath);
	272	return -1; /* error */
	273	}
	274	trace_collection_add(&trace_collection_read, td_read);
	275	}
	276	return 0; /* success */
	277	}
	278
	279	int main(int argc, char **argv)
	280	{
	281	int ret;
	282	struct format *fmt_write;
	283	struct trace_descriptor *td_write;
	284
	285	ret = parse_options(argc, argv);
	286	if (ret < 0) {
	287	fprintf(stdout, "Error parsing options.\n\n");
	288	usage(stdout);
	289	exit(EXIT_FAILURE);
	290	} else if (ret > 0) {
	291	exit(EXIT_SUCCESS);
	292	}
	293	printf_verbose("Verbose mode active.\n");
	294	printf_debug("Debug mode active.\n");
	295
	296	if (opt_input_format)
	297	strlower(opt_input_format);
	298	if (opt_output_format)
	299	strlower(opt_output_format);
	300
	301	printf_verbose("Converting from directory: %s\n", opt_input_path);
	302	printf_verbose("Converting from format: %s\n",
	303	opt_input_format ? : "ctf <default>");
	304	printf_verbose("Converting to directory: %s\n",
	305	opt_output_path ? : "<stdout>");
	306	printf_verbose("Converting to format: %s\n",
	307	opt_output_format ? : "text <default>");
	308
	309	if (!opt_input_format)
	310	opt_input_format = "ctf";
	311	if (!opt_output_format)
	312	opt_output_format = "text";
	313	fmt_read = bt_lookup_format(g_quark_from_static_string(opt_input_format));
	314	if (!fmt_read) {
	315	fprintf(stdout, "[error] Format \"%s\" is not supported.\n\n",
	316	opt_input_format);
	317	exit(EXIT_FAILURE);
	318	}
	319	fmt_write = bt_lookup_format(g_quark_from_static_string(opt_output_format));
	320	if (!fmt_write) {
	321	fprintf(stdout, "[error] format \"%s\" is not supported.\n\n",
	322	opt_output_format);
	323	exit(EXIT_FAILURE);
	324	}
	325
	326	/*
	327	* pass the input path to nftw() .
	328	* specify traverse_dir() as the callback function.
	329	* depth = 10 which is the max number of file descriptors
	330	* that nftw() can open at a given time.
	331	* flags = 0 check nftw documentation for more info .
	332	*/
	333	init_trace_collection(&trace_collection_read);
	334	ret = nftw(opt_input_path, traverse_dir, 10, 0);
	335	if (ret != 0) {
	336	fprintf(stdout, "[error] opening trace \"%s\" for reading.\n\n",
	337	opt_input_path);
	338	goto error_td_read;
	339	}
	340	if (trace_collection_read.array->len == 0) {
	341	fprintf(stdout, "[warning] no metadata file was found."
	342	" no output was generated\n");
	343	return 0;
	344	}
	345
	346	td_write = fmt_write->open_trace(NULL, opt_output_path, O_RDWR, NULL, NULL);
	347	if (!td_write) {
	348	fprintf(stdout, "Error opening trace \"%s\" for writing.\n\n",
	349	opt_output_path ? : "<none>");
	350	goto error_td_write;
	351	}
	352
	353	ret = convert_trace(td_write, &trace_collection_read);
	354	if (ret) {
	355	fprintf(stdout, "Error printing trace.\n\n");
	356	goto error_copy_trace;
	357	}
	358
	359	fmt_write->close_trace(td_write);
	360	finalize_trace_collection(&trace_collection_read);
	361	printf_verbose("finished converting. Output written to:\n%s\n",
	362	opt_output_path ? : "<stdout>");
	363	exit(EXIT_SUCCESS);
	364
	365	/* Error handling */
	366	error_copy_trace:
	367	fmt_write->close_trace(td_write);
	368	error_td_write:
	369	finalize_trace_collection(&trace_collection_read);
	370	error_td_read:
	371	exit(EXIT_FAILURE);
	372	}