[deliverable/linux.git] / tools / perf / util / trace-event-read.c

/*
 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License (not later!)
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>

#include "../perf.h"
#include "util.h"
#include "trace-event.h"
#include "debug.h"

static int input_fd;

static ssize_t trace_data_size;
static bool repipe;

static int __do_read(int fd, void *buf, int size)
{
	int rsize = size;

	while (size) {
		int ret = read(fd, buf, size);

		if (ret <= 0)
			return -1;

		if (repipe) {
			int retw = write(STDOUT_FILENO, buf, ret);

			if (retw <= 0 || retw != ret) {
				pr_debug("repiping input file");
				return -1;
			}
		}

		size -= ret;
		buf += ret;
	}

	return rsize;
}

static int do_read(void *data, int size)
{
	int r;

	r = __do_read(input_fd, data, size);
	if (r <= 0) {
		pr_debug("reading input file (size expected=%d received=%d)",
			 size, r);
		return -1;
	}

	trace_data_size += r;

	return r;
}

/* If it fails, the next read will report it */
static void skip(int size)
{
	char buf[BUFSIZ];
	int r;

	while (size) {
		r = size > BUFSIZ ? BUFSIZ : size;
		do_read(buf, r);
		size -= r;
	};
}

static unsigned int read4(struct pevent *pevent)
{
	unsigned int data;

	if (do_read(&data, 4) < 0)
		return 0;
	return __data2host4(pevent, data);
}

static unsigned long long read8(struct pevent *pevent)
{
	unsigned long long data;

	if (do_read(&data, 8) < 0)
		return 0;
	return __data2host8(pevent, data);
}

static char *read_string(void)
{
	char buf[BUFSIZ];
	char *str = NULL;
	int size = 0;
	off_t r;
	char c;

	for (;;) {
		r = read(input_fd, &c, 1);
		if (r < 0) {
			pr_debug("reading input file");
			goto out;
		}

		if (!r) {
			pr_debug("no data");
			goto out;
		}

		if (repipe) {
			int retw = write(STDOUT_FILENO, &c, 1);

			if (retw <= 0 || retw != r) {
				pr_debug("repiping input file string");
				goto out;
			}
		}

		buf[size++] = c;

		if (!c)
			break;
	}

	trace_data_size += size;

	str = malloc(size);
	if (str)
		memcpy(str, buf, size);
out:
	return str;
}

static int read_proc_kallsyms(struct pevent *pevent)
{
	unsigned int size;

	size = read4(pevent);
	if (!size)
		return 0;
	/*
	 * Just skip it, now that we configure libtraceevent to use the
	 * tools/perf/ symbol resolver.
	 *
	 * We need to skip it so that we can continue parsing old perf.data
	 * files, that contains this /proc/kallsyms payload.
	 *
	 * Newer perf.data files will have just the 4-bytes zeros "kallsyms
	 * payload", so that older tools can continue reading it and interpret
	 * it as "no kallsyms payload is present".
	 */
	lseek(input_fd, size, SEEK_CUR);
	trace_data_size += size;
	return 0;
}

static int read_ftrace_printk(struct pevent *pevent)
{
	unsigned int size;
	char *buf;

	/* it can have 0 size */
	size = read4(pevent);
	if (!size)
		return 0;

	buf = malloc(size);
	if (buf == NULL)
		return -1;

	if (do_read(buf, size) < 0) {
		free(buf);
		return -1;
	}

	parse_ftrace_printk(pevent, buf, size);

	free(buf);
	return 0;
}

static int read_header_files(struct pevent *pevent)
{
	unsigned long long size;
	char *header_page;
	char buf[BUFSIZ];
	int ret = 0;

	if (do_read(buf, 12) < 0)
		return -1;

	if (memcmp(buf, "header_page", 12) != 0) {
		pr_debug("did not read header page");
		return -1;
	}

	size = read8(pevent);

	header_page = malloc(size);
	if (header_page == NULL)
		return -1;

	if (do_read(header_page, size) < 0) {
		pr_debug("did not read header page");
		free(header_page);
		return -1;
	}

	if (!pevent_parse_header_page(pevent, header_page, size,
				      pevent_get_long_size(pevent))) {
		/*
		 * The commit field in the page is of type long,
		 * use that instead, since it represents the kernel.
		 */
		pevent_set_long_size(pevent, pevent->header_page_size_size);
	}
	free(header_page);

	if (do_read(buf, 13) < 0)
		return -1;

	if (memcmp(buf, "header_event", 13) != 0) {
		pr_debug("did not read header event");
		return -1;
	}

	size = read8(pevent);
	skip(size);

	return ret;
}

static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
{
	char *buf;

	buf = malloc(size);
	if (buf == NULL)
		return -1;

	if (do_read(buf, size) < 0) {
		free(buf);
		return -1;
	}

	parse_ftrace_file(pevent, buf, size);
	free(buf);
	return 0;
}

static int read_event_file(struct pevent *pevent, char *sys,
			    unsigned long long size)
{
	char *buf;

	buf = malloc(size);
	if (buf == NULL)
		return -1;

	if (do_read(buf, size) < 0) {
		free(buf);
		return -1;
	}

	parse_event_file(pevent, buf, size, sys);
	free(buf);
	return 0;
}

static int read_ftrace_files(struct pevent *pevent)
{
	unsigned long long size;
	int count;
	int i;
	int ret;

	count = read4(pevent);

	for (i = 0; i < count; i++) {
		size = read8(pevent);
		ret = read_ftrace_file(pevent, size);
		if (ret)
			return ret;
	}
	return 0;
}

static int read_event_files(struct pevent *pevent)
{
	unsigned long long size;
	char *sys;
	int systems;
	int count;
	int i,x;
	int ret;

	systems = read4(pevent);

	for (i = 0; i < systems; i++) {
		sys = read_string();
		if (sys == NULL)
			return -1;

		count = read4(pevent);

		for (x=0; x < count; x++) {
			size = read8(pevent);
			ret = read_event_file(pevent, sys, size);
			if (ret)
				return ret;
		}
	}
	return 0;
}

ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
{
	char buf[BUFSIZ];
	char test[] = { 23, 8, 68 };
	char *version;
	int show_version = 0;
	int show_funcs = 0;
	int show_printk = 0;
	ssize_t size = -1;
	int file_bigendian;
	int host_bigendian;
	int file_long_size;
	int file_page_size;
	struct pevent *pevent = NULL;
	int err;

	repipe = __repipe;
	input_fd = fd;

	if (do_read(buf, 3) < 0)
		return -1;
	if (memcmp(buf, test, 3) != 0) {
		pr_debug("no trace data in the file");
		return -1;
	}

	if (do_read(buf, 7) < 0)
		return -1;
	if (memcmp(buf, "tracing", 7) != 0) {
		pr_debug("not a trace file (missing 'tracing' tag)");
		return -1;
	}

	version = read_string();
	if (version == NULL)
		return -1;
	if (show_version)
		printf("version = %s\n", version);
	free(version);

	if (do_read(buf, 1) < 0)
		return -1;
	file_bigendian = buf[0];
	host_bigendian = bigendian();

	if (trace_event__init(tevent)) {
		pr_debug("trace_event__init failed");
		goto out;
	}

	pevent = tevent->pevent;

	pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
	pevent_set_file_bigendian(pevent, file_bigendian);
	pevent_set_host_bigendian(pevent, host_bigendian);

	if (do_read(buf, 1) < 0)
		goto out;
	file_long_size = buf[0];

	file_page_size = read4(pevent);
	if (!file_page_size)
		goto out;

	pevent_set_long_size(pevent, file_long_size);
	pevent_set_page_size(pevent, file_page_size);

	err = read_header_files(pevent);
	if (err)
		goto out;
	err = read_ftrace_files(pevent);
	if (err)
		goto out;
	err = read_event_files(pevent);
	if (err)
		goto out;
	err = read_proc_kallsyms(pevent);
	if (err)
		goto out;
	err = read_ftrace_printk(pevent);
	if (err)
		goto out;

	size = trace_data_size;
	repipe = false;

	if (show_funcs) {
		pevent_print_funcs(pevent);
	} else if (show_printk) {
		pevent_print_printk(pevent);
	}

	pevent = NULL;

out:
	if (pevent)
		trace_event__cleanup(tevent);
	return size;
}
Commit	Line	Data
538bafb5 SR	1	/*
	2	* Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
	3	*
	4	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; version 2 of the License (not later!)
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*
	19	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	20	*/
538bafb5 SR	21	#include <dirent.h>
	22	#include <stdio.h>
	23	#include <stdlib.h>
	24	#include <string.h>
538bafb5 SR	25	#include <stdarg.h>
	26	#include <sys/types.h>
	27	#include <sys/stat.h>
	28	#include <sys/wait.h>
	29	#include <sys/mman.h>
	30	#include <pthread.h>
	31	#include <fcntl.h>
	32	#include <unistd.h>
538bafb5 SR	33	#include <errno.h>
538bafb5 SR	34
1ef2ed10	35	#include "../perf.h"
538bafb5 SR	36	#include "util.h"
538bafb5 SR	37	#include "trace-event.h"
84f5d36f	38	#include "debug.h"
538bafb5 SR	39
	40	static int input_fd;
	41
ebf3c675	42	static ssize_t trace_data_size;
454c407e	43	static bool repipe;
9215545e	44
4a31e565	45	static int __do_read(int fd, void *buf, int size)
9215545e TZ	46	{
	47	int rsize = size;
	48
	49	while (size) {
	50	int ret = read(fd, buf, size);
	51
	52	if (ret <= 0)
	53	return -1;
	54
454c407e TZ	55	if (repipe) {
	56	int retw = write(STDOUT_FILENO, buf, ret);
	57
4a31e565 NK	58	if (retw <= 0 \|\| retw != ret) {
	59	pr_debug("repiping input file");
	60	return -1;
	61	}
454c407e TZ	62	}
454c407e TZ	63
9215545e TZ	64	size -= ret;
	65	buf += ret;
	66	}
	67
	68	return rsize;
	69	}
	70
4a31e565	71	static int do_read(void *data, int size)
538bafb5 SR	72	{
	73	int r;
	74
4a31e565 NK	75	r = __do_read(input_fd, data, size);
	76	if (r <= 0) {
	77	pr_debug("reading input file (size expected=%d received=%d)",
	78	size, r);
	79	return -1;
	80	}
9215545e	81
ebf3c675	82	trace_data_size += r;
9215545e	83
538bafb5 SR	84	return r;
	85	}
	86
cbb5cf7f TZ	87	/* If it fails, the next read will report it */
	88	static void skip(int size)
	89	{
	90	char buf[BUFSIZ];
	91	int r;
	92
	93	while (size) {
	94	r = size > BUFSIZ ? BUFSIZ : size;
4a31e565	95	do_read(buf, r);
cbb5cf7f TZ	96	size -= r;
	97	};
	98	}
	99
da378962	100	static unsigned int read4(struct pevent *pevent)
538bafb5 SR	101	{
	102	unsigned int data;
	103
4a31e565 NK	104	if (do_read(&data, 4) < 0)
4a31e565 NK	105	return 0;
da378962	106	return __data2host4(pevent, data);
538bafb5 SR	107	}
538bafb5 SR	108
da378962	109	static unsigned long long read8(struct pevent *pevent)
538bafb5 SR	110	{
	111	unsigned long long data;
	112
4a31e565 NK	113	if (do_read(&data, 8) < 0)
4a31e565 NK	114	return 0;
da378962	115	return __data2host8(pevent, data);
538bafb5 SR	116	}
	117
	118	static char *read_string(void)
	119	{
	120	char buf[BUFSIZ];
	121	char *str = NULL;
	122	int size = 0;
f887f301	123	off_t r;
9215545e	124	char c;
538bafb5 SR	125
538bafb5 SR	126	for (;;) {
9215545e	127	r = read(input_fd, &c, 1);
452958fd NK	128	if (r < 0) {
	129	pr_debug("reading input file");
	130	goto out;
	131	}
538bafb5	132
452958fd NK	133	if (!r) {
	134	pr_debug("no data");
	135	goto out;
	136	}
538bafb5	137
454c407e TZ	138	if (repipe) {
	139	int retw = write(STDOUT_FILENO, &c, 1);
	140
452958fd NK	141	if (retw <= 0 \|\| retw != r) {
	142	pr_debug("repiping input file string");
	143	goto out;
	144	}
454c407e TZ	145	}
454c407e TZ	146
9215545e	147	buf[size++] = c;
538bafb5	148
9215545e TZ	149	if (!c)
9215545e TZ	150	break;
538bafb5 SR	151	}
538bafb5 SR	152
ebf3c675	153	trace_data_size += size;
9215545e	154
a4c98367 NK	155	str = malloc(size);
	156	if (str)
	157	memcpy(str, buf, size);
452958fd	158	out:
538bafb5 SR	159	return str;
	160	}
	161
a4c98367	162	static int read_proc_kallsyms(struct pevent *pevent)
538bafb5 SR	163	{
538bafb5 SR	164	unsigned int size;
538bafb5	165
da378962	166	size = read4(pevent);
538bafb5	167	if (!size)
a4c98367	168	return 0;
4263cece ACM	169	/*
	170	* Just skip it, now that we configure libtraceevent to use the
	171	* tools/perf/ symbol resolver.
	172	*
	173	* We need to skip it so that we can continue parsing old perf.data
	174	* files, that contains this /proc/kallsyms payload.
	175	*
	176	* Newer perf.data files will have just the 4-bytes zeros "kallsyms
	177	* payload", so that older tools can continue reading it and interpret
	178	* it as "no kallsyms payload is present".
	179	*/
	180	lseek(input_fd, size, SEEK_CUR);
	181	trace_data_size += size;
a4c98367	182	return 0;
538bafb5 SR	183	}
538bafb5 SR	184
a4c98367	185	static int read_ftrace_printk(struct pevent *pevent)
538bafb5 SR	186	{
	187	unsigned int size;
	188	char *buf;
	189
4a31e565	190	/* it can have 0 size */
da378962	191	size = read4(pevent);
538bafb5	192	if (!size)
a4c98367 NK	193	return 0;
	194
	195	buf = malloc(size);
	196	if (buf == NULL)
	197	return -1;
538bafb5	198
4a31e565 NK	199	if (do_read(buf, size) < 0) {
	200	free(buf);
	201	return -1;
	202	}
538bafb5	203
da378962	204	parse_ftrace_printk(pevent, buf, size);
538bafb5 SR	205
538bafb5 SR	206	free(buf);
a4c98367	207	return 0;
538bafb5 SR	208	}
538bafb5 SR	209
a4c98367	210	static int read_header_files(struct pevent *pevent)
538bafb5 SR	211	{
538bafb5 SR	212	unsigned long long size;
94b4d89e	213	char *header_page;
538bafb5	214	char buf[BUFSIZ];
4a31e565	215	int ret = 0;
538bafb5	216
4a31e565 NK	217	if (do_read(buf, 12) < 0)
4a31e565 NK	218	return -1;
538bafb5	219
452958fd NK	220	if (memcmp(buf, "header_page", 12) != 0) {
	221	pr_debug("did not read header page");
	222	return -1;
	223	}
538bafb5	224
da378962	225	size = read8(pevent);
94b4d89e NK	226
	227	header_page = malloc(size);
	228	if (header_page == NULL)
	229	return -1;
	230
	231	if (do_read(header_page, size) < 0) {
	232	pr_debug("did not read header page");
	233	free(header_page);
	234	return -1;
	235	}
	236
	237	if (!pevent_parse_header_page(pevent, header_page, size,
	238	pevent_get_long_size(pevent))) {
	239	/*
	240	* The commit field in the page is of type long,
	241	* use that instead, since it represents the kernel.
	242	*/
	243	pevent_set_long_size(pevent, pevent->header_page_size_size);
	244	}
	245	free(header_page);
538bafb5	246
4a31e565 NK	247	if (do_read(buf, 13) < 0)
	248	return -1;
	249
452958fd NK	250	if (memcmp(buf, "header_event", 13) != 0) {
	251	pr_debug("did not read header event");
	252	return -1;
	253	}
538bafb5	254
da378962	255	size = read8(pevent);
2b2efc7f	256	skip(size);
4a31e565	257
4a31e565	258	return ret;
538bafb5 SR	259	}
538bafb5 SR	260
a4c98367	261	static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
538bafb5 SR	262	{
	263	char *buf;
	264
a4c98367 NK	265	buf = malloc(size);
	266	if (buf == NULL)
	267	return -1;
	268
4a31e565 NK	269	if (do_read(buf, size) < 0) {
	270	free(buf);
	271	return -1;
	272	}
	273
da378962	274	parse_ftrace_file(pevent, buf, size);
538bafb5	275	free(buf);
a4c98367	276	return 0;
538bafb5 SR	277	}
538bafb5 SR	278
a4c98367	279	static int read_event_file(struct pevent pevent, char sys,
da378962	280	unsigned long long size)
538bafb5 SR	281	{
	282	char *buf;
	283
a4c98367 NK	284	buf = malloc(size);
	285	if (buf == NULL)
	286	return -1;
	287
4a31e565 NK	288	if (do_read(buf, size) < 0) {
	289	free(buf);
	290	return -1;
	291	}
	292
da378962	293	parse_event_file(pevent, buf, size, sys);
538bafb5	294	free(buf);
a4c98367	295	return 0;
538bafb5 SR	296	}
538bafb5 SR	297
a4c98367	298	static int read_ftrace_files(struct pevent *pevent)
538bafb5 SR	299	{
	300	unsigned long long size;
	301	int count;
	302	int i;
a4c98367	303	int ret;
538bafb5	304
da378962	305	count = read4(pevent);
538bafb5 SR	306
538bafb5 SR	307	for (i = 0; i < count; i++) {
da378962	308	size = read8(pevent);
a4c98367 NK	309	ret = read_ftrace_file(pevent, size);
	310	if (ret)
	311	return ret;
538bafb5	312	}
a4c98367	313	return 0;
538bafb5 SR	314	}
538bafb5 SR	315
a4c98367	316	static int read_event_files(struct pevent *pevent)
538bafb5 SR	317	{
	318	unsigned long long size;
	319	char *sys;
	320	int systems;
	321	int count;
	322	int i,x;
a4c98367	323	int ret;
538bafb5	324
da378962	325	systems = read4(pevent);
538bafb5 SR	326
	327	for (i = 0; i < systems; i++) {
	328	sys = read_string();
a4c98367 NK	329	if (sys == NULL)
a4c98367 NK	330	return -1;
538bafb5	331
da378962	332	count = read4(pevent);
4a31e565	333
538bafb5	334	for (x=0; x < count; x++) {
da378962	335	size = read8(pevent);
a4c98367 NK	336	ret = read_event_file(pevent, sys, size);
	337	if (ret)
	338	return ret;
538bafb5 SR	339	}
538bafb5 SR	340	}
a4c98367	341	return 0;
538bafb5 SR	342	}
538bafb5 SR	343
29f5ffd3	344	ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
538bafb5	345	{
538bafb5 SR	346	char buf[BUFSIZ];
	347	char test[] = { 23, 8, 68 };
	348	char *version;
d9340c1d	349	int show_version = 0;
538bafb5 SR	350	int show_funcs = 0;
538bafb5 SR	351	int show_printk = 0;
3dce2ce3	352	ssize_t size = -1;
63af28fa NK	353	int file_bigendian;
63af28fa NK	354	int host_bigendian;
59657f9c	355	int file_long_size;
30f36762	356	int file_page_size;
29f5ffd3	357	struct pevent *pevent = NULL;
a4c98367	358	int err;
3dce2ce3	359
454c407e	360	repipe = __repipe;
03456a15	361	input_fd = fd;
538bafb5	362
4a31e565 NK	363	if (do_read(buf, 3) < 0)
4a31e565 NK	364	return -1;
452958fd NK	365	if (memcmp(buf, test, 3) != 0) {
	366	pr_debug("no trace data in the file");
	367	return -1;
	368	}
538bafb5	369
4a31e565 NK	370	if (do_read(buf, 7) < 0)
4a31e565 NK	371	return -1;
452958fd NK	372	if (memcmp(buf, "tracing", 7) != 0) {
	373	pr_debug("not a trace file (missing 'tracing' tag)");
	374	return -1;
	375	}
538bafb5 SR	376
538bafb5 SR	377	version = read_string();
a4c98367 NK	378	if (version == NULL)
a4c98367 NK	379	return -1;
d9340c1d IM	380	if (show_version)
d9340c1d IM	381	printf("version = %s\n", version);
538bafb5 SR	382	free(version);
538bafb5 SR	383
4a31e565 NK	384	if (do_read(buf, 1) < 0)
4a31e565 NK	385	return -1;
538bafb5 SR	386	file_bigendian = buf[0];
	387	host_bigendian = bigendian();
	388
29f5ffd3 JO	389	if (trace_event__init(tevent)) {
29f5ffd3 JO	390	pr_debug("trace_event__init failed");
3dce2ce3 NK	391	goto out;
3dce2ce3 NK	392	}
aaf045f7	393
29f5ffd3 JO	394	pevent = tevent->pevent;
	395
	396	pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
	397	pevent_set_file_bigendian(pevent, file_bigendian);
	398	pevent_set_host_bigendian(pevent, host_bigendian);
	399
4a31e565 NK	400	if (do_read(buf, 1) < 0)
4a31e565 NK	401	goto out;
59657f9c	402	file_long_size = buf[0];
538bafb5	403
30f36762 NK	404	file_page_size = read4(pevent);
30f36762 NK	405	if (!file_page_size)
4a31e565	406	goto out;
538bafb5	407
59657f9c	408	pevent_set_long_size(pevent, file_long_size);
30f36762 NK	409	pevent_set_page_size(pevent, file_page_size);
30f36762 NK	410
a4c98367 NK	411	err = read_header_files(pevent);
	412	if (err)
	413	goto out;
	414	err = read_ftrace_files(pevent);
	415	if (err)
	416	goto out;
	417	err = read_event_files(pevent);
	418	if (err)
	419	goto out;
	420	err = read_proc_kallsyms(pevent);
	421	if (err)
	422	goto out;
	423	err = read_ftrace_printk(pevent);
	424	if (err)
	425	goto out;
538bafb5	426
ebf3c675	427	size = trace_data_size;
454c407e	428	repipe = false;
9215545e	429
538bafb5	430	if (show_funcs) {
3dce2ce3 NK	431	pevent_print_funcs(pevent);
	432	} else if (show_printk) {
	433	pevent_print_printk(pevent);
538bafb5 SR	434	}
538bafb5 SR	435
3dce2ce3 NK	436	pevent = NULL;
	437
	438	out:
	439	if (pevent)
29f5ffd3	440	trace_event__cleanup(tevent);
9215545e	441	return size;
538bafb5	442	}