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

/*
 * Copyright (C) 2008,2009, Steven Rostedt <[email protected]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * 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 "util.h"
#include <dirent.h>
#include <mntent.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 <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdbool.h>
#include <linux/list.h>
#include <linux/kernel.h>

#include "../perf.h"
#include "trace-event.h"
#include <lk/debugfs.h>
#include "evsel.h"

#define VERSION "0.5"

static const char *output_file = "trace.info";
static int output_fd;


static void *malloc_or_die(unsigned int size)
{
	void *data;

	data = malloc(size);
	if (!data)
		die("malloc");
	return data;
}

static const char *find_debugfs(void)
{
	const char *path = perf_debugfs_mount(NULL);

	if (!path)
		die("Your kernel not support debugfs filesystem");

	return path;
}

/*
 * Finds the path to the debugfs/tracing
 * Allocates the string and stores it.
 */
static const char *find_tracing_dir(void)
{
	static char *tracing;
	static int tracing_found;
	const char *debugfs;

	if (tracing_found)
		return tracing;

	debugfs = find_debugfs();

	tracing = malloc_or_die(strlen(debugfs) + 9);

	sprintf(tracing, "%s/tracing", debugfs);

	tracing_found = 1;
	return tracing;
}

static char *get_tracing_file(const char *name)
{
	const char *tracing;
	char *file;

	tracing = find_tracing_dir();
	if (!tracing)
		return NULL;

	file = malloc_or_die(strlen(tracing) + strlen(name) + 2);

	sprintf(file, "%s/%s", tracing, name);
	return file;
}

static void put_tracing_file(char *file)
{
	free(file);
}

static ssize_t write_or_die(const void *buf, size_t len)
{
	int ret;

	ret = write(output_fd, buf, len);
	if (ret < 0)
		die("writing to '%s'", output_file);

	return ret;
}

int bigendian(void)
{
	unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
	unsigned int *ptr;

	ptr = (unsigned int *)(void *)str;
	return *ptr == 0x01020304;
}

/* unfortunately, you can not stat debugfs or proc files for size */
static void record_file(const char *file, size_t hdr_sz)
{
	unsigned long long size = 0;
	char buf[BUFSIZ], *sizep;
	off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
	int r, fd;

	fd = open(file, O_RDONLY);
	if (fd < 0)
		die("Can't read '%s'", file);

	/* put in zeros for file size, then fill true size later */
	if (hdr_sz)
		write_or_die(&size, hdr_sz);

	do {
		r = read(fd, buf, BUFSIZ);
		if (r > 0) {
			size += r;
			write_or_die(buf, r);
		}
	} while (r > 0);
	close(fd);

	/* ugh, handle big-endian hdr_size == 4 */
	sizep = (char*)&size;
	if (bigendian())
		sizep += sizeof(u64) - hdr_sz;

	if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0)
		die("writing to %s", output_file);
}

static void read_header_files(void)
{
	char *path;
	struct stat st;

	path = get_tracing_file("events/header_page");
	if (stat(path, &st) < 0)
		die("can't read '%s'", path);

	write_or_die("header_page", 12);
	record_file(path, 8);
	put_tracing_file(path);

	path = get_tracing_file("events/header_event");
	if (stat(path, &st) < 0)
		die("can't read '%s'", path);

	write_or_die("header_event", 13);
	record_file(path, 8);
	put_tracing_file(path);
}

static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
{
	while (tps) {
		if (!strcmp(sys, tps->name))
			return true;
		tps = tps->next;
	}

	return false;
}

static void copy_event_system(const char *sys, struct tracepoint_path *tps)
{
	struct dirent *dent;
	struct stat st;
	char *format;
	DIR *dir;
	int count = 0;
	int ret;

	dir = opendir(sys);
	if (!dir)
		die("can't read directory '%s'", sys);

	while ((dent = readdir(dir))) {
		if (dent->d_type != DT_DIR ||
		    strcmp(dent->d_name, ".") == 0 ||
		    strcmp(dent->d_name, "..") == 0 ||
		    !name_in_tp_list(dent->d_name, tps))
			continue;
		format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
		sprintf(format, "%s/%s/format", sys, dent->d_name);
		ret = stat(format, &st);
		free(format);
		if (ret < 0)
			continue;
		count++;
	}

	write_or_die(&count, 4);

	rewinddir(dir);
	while ((dent = readdir(dir))) {
		if (dent->d_type != DT_DIR ||
		    strcmp(dent->d_name, ".") == 0 ||
		    strcmp(dent->d_name, "..") == 0 ||
		    !name_in_tp_list(dent->d_name, tps))
			continue;
		format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
		sprintf(format, "%s/%s/format", sys, dent->d_name);
		ret = stat(format, &st);

		if (ret >= 0)
			record_file(format, 8);

		free(format);
	}
	closedir(dir);
}

static void read_ftrace_files(struct tracepoint_path *tps)
{
	char *path;

	path = get_tracing_file("events/ftrace");

	copy_event_system(path, tps);

	put_tracing_file(path);
}

static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
{
	while (tps) {
		if (!strcmp(sys, tps->system))
			return true;
		tps = tps->next;
	}

	return false;
}

static void read_event_files(struct tracepoint_path *tps)
{
	struct dirent *dent;
	struct stat st;
	char *path;
	char *sys;
	DIR *dir;
	int count = 0;
	int ret;

	path = get_tracing_file("events");

	dir = opendir(path);
	if (!dir)
		die("can't read directory '%s'", path);

	while ((dent = readdir(dir))) {
		if (dent->d_type != DT_DIR ||
		    strcmp(dent->d_name, ".") == 0 ||
		    strcmp(dent->d_name, "..") == 0 ||
		    strcmp(dent->d_name, "ftrace") == 0 ||
		    !system_in_tp_list(dent->d_name, tps))
			continue;
		count++;
	}

	write_or_die(&count, 4);

	rewinddir(dir);
	while ((dent = readdir(dir))) {
		if (dent->d_type != DT_DIR ||
		    strcmp(dent->d_name, ".") == 0 ||
		    strcmp(dent->d_name, "..") == 0 ||
		    strcmp(dent->d_name, "ftrace") == 0 ||
		    !system_in_tp_list(dent->d_name, tps))
			continue;
		sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
		sprintf(sys, "%s/%s", path, dent->d_name);
		ret = stat(sys, &st);
		if (ret >= 0) {
			write_or_die(dent->d_name, strlen(dent->d_name) + 1);
			copy_event_system(sys, tps);
		}
		free(sys);
	}

	closedir(dir);
	put_tracing_file(path);
}

static void read_proc_kallsyms(void)
{
	unsigned int size;
	const char *path = "/proc/kallsyms";
	struct stat st;
	int ret;

	ret = stat(path, &st);
	if (ret < 0) {
		/* not found */
		size = 0;
		write_or_die(&size, 4);
		return;
	}
	record_file(path, 4);
}

static void read_ftrace_printk(void)
{
	unsigned int size;
	char *path;
	struct stat st;
	int ret;

	path = get_tracing_file("printk_formats");
	ret = stat(path, &st);
	if (ret < 0) {
		/* not found */
		size = 0;
		write_or_die(&size, 4);
		goto out;
	}
	record_file(path, 4);

out:
	put_tracing_file(path);
}

static struct tracepoint_path *
get_tracepoints_path(struct list_head *pattrs)
{
	struct tracepoint_path path, *ppath = &path;
	struct perf_evsel *pos;
	int nr_tracepoints = 0;

	list_for_each_entry(pos, pattrs, node) {
		if (pos->attr.type != PERF_TYPE_TRACEPOINT)
			continue;
		++nr_tracepoints;
		ppath->next = tracepoint_id_to_path(pos->attr.config);
		if (!ppath->next)
			die("%s\n", "No memory to alloc tracepoints list");
		ppath = ppath->next;
	}

	return nr_tracepoints > 0 ? path.next : NULL;
}

static void
put_tracepoints_path(struct tracepoint_path *tps)
{
	while (tps) {
		struct tracepoint_path *t = tps;

		tps = tps->next;
		free(t->name);
		free(t->system);
		free(t);
	}
}

bool have_tracepoints(struct list_head *pattrs)
{
	struct perf_evsel *pos;

	list_for_each_entry(pos, pattrs, node)
		if (pos->attr.type == PERF_TYPE_TRACEPOINT)
			return true;

	return false;
}

static void tracing_data_header(void)
{
	char buf[20];

	/* just guessing this is someone's birthday.. ;) */
	buf[0] = 23;
	buf[1] = 8;
	buf[2] = 68;
	memcpy(buf + 3, "tracing", 7);

	write_or_die(buf, 10);

	write_or_die(VERSION, strlen(VERSION) + 1);

	/* save endian */
	if (bigendian())
		buf[0] = 1;
	else
		buf[0] = 0;

	read_trace_init(buf[0], buf[0]);

	write_or_die(buf, 1);

	/* save size of long */
	buf[0] = sizeof(long);
	write_or_die(buf, 1);

	/* save page_size */
	write_or_die(&page_size, 4);
}

struct tracing_data *tracing_data_get(struct list_head *pattrs,
				      int fd, bool temp)
{
	struct tracepoint_path *tps;
	struct tracing_data *tdata;

	output_fd = fd;

	tps = get_tracepoints_path(pattrs);
	if (!tps)
		return NULL;

	tdata = malloc_or_die(sizeof(*tdata));
	tdata->temp = temp;
	tdata->size = 0;

	if (temp) {
		int temp_fd;

		snprintf(tdata->temp_file, sizeof(tdata->temp_file),
			 "/tmp/perf-XXXXXX");
		if (!mkstemp(tdata->temp_file))
			die("Can't make temp file");

		temp_fd = open(tdata->temp_file, O_RDWR);
		if (temp_fd < 0)
			die("Can't read '%s'", tdata->temp_file);

		/*
		 * Set the temp file the default output, so all the
		 * tracing data are stored into it.
		 */
		output_fd = temp_fd;
	}

	tracing_data_header();
	read_header_files();
	read_ftrace_files(tps);
	read_event_files(tps);
	read_proc_kallsyms();
	read_ftrace_printk();

	/*
	 * All tracing data are stored by now, we can restore
	 * the default output file in case we used temp file.
	 */
	if (temp) {
		tdata->size = lseek(output_fd, 0, SEEK_CUR);
		close(output_fd);
		output_fd = fd;
	}

	put_tracepoints_path(tps);
	return tdata;
}

void tracing_data_put(struct tracing_data *tdata)
{
	if (tdata->temp) {
		record_file(tdata->temp_file, 0);
		unlink(tdata->temp_file);
	}

	free(tdata);
}

int read_tracing_data(int fd, struct list_head *pattrs)
{
	struct tracing_data *tdata;

	/*
	 * We work over the real file, so we can write data
	 * directly, no temp file is needed.
	 */
	tdata = tracing_data_get(pattrs, fd, false);
	if (!tdata)
		return -ENOMEM;

	tracing_data_put(tdata);
	return 0;
}
Commit	Line	Data
52050943 SR	1	/*
	2	* Copyright (C) 2008,2009, Steven Rostedt <[email protected]>
	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	*/
c168fbfb	21	#include "util.h"
52050943	22	#include <dirent.h>
659d8cfb	23	#include <mntent.h>
52050943 SR	24	#include <stdio.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	27	#include <stdarg.h>
	28	#include <sys/types.h>
	29	#include <sys/stat.h>
	30	#include <sys/wait.h>
	31	#include <pthread.h>
	32	#include <fcntl.h>
	33	#include <unistd.h>
52050943	34	#include <errno.h>
1ef2ed10	35	#include <stdbool.h>
69aad6f1	36	#include <linux/list.h>
e2561368	37	#include <linux/kernel.h>
52050943	38
1ef2ed10	39	#include "../perf.h"
52050943	40	#include "trace-event.h"
85c66be1	41	#include <lk/debugfs.h>
69aad6f1	42	#include "evsel.h"
52050943	43
52050943 SR	44	#define VERSION "0.5"
52050943 SR	45
52050943 SR	46	static const char *output_file = "trace.info";
	47	static int output_fd;
	48
52050943	49
aaf045f7	50	static void *malloc_or_die(unsigned int size)
52050943 SR	51	{
	52	void *data;
	53
	54	data = malloc(size);
	55	if (!data)
	56	die("malloc");
	57	return data;
	58	}
	59
	60	static const char *find_debugfs(void)
	61	{
1355915a	62	const char *path = perf_debugfs_mount(NULL);
52050943	63
61be3e59 XG	64	if (!path)
61be3e59 XG	65	die("Your kernel not support debugfs filesystem");
52050943	66
61be3e59	67	return path;
52050943 SR	68	}
	69
	70	/*
	71	* Finds the path to the debugfs/tracing
	72	* Allocates the string and stores it.
	73	*/
	74	static const char *find_tracing_dir(void)
	75	{
	76	static char *tracing;
	77	static int tracing_found;
	78	const char *debugfs;
	79
	80	if (tracing_found)
	81	return tracing;
	82
	83	debugfs = find_debugfs();
	84
	85	tracing = malloc_or_die(strlen(debugfs) + 9);
	86
	87	sprintf(tracing, "%s/tracing", debugfs);
	88
	89	tracing_found = 1;
	90	return tracing;
	91	}
	92
	93	static char get_tracing_file(const char name)
	94	{
	95	const char *tracing;
	96	char *file;
	97
	98	tracing = find_tracing_dir();
	99	if (!tracing)
	100	return NULL;
	101
	102	file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
	103
	104	sprintf(file, "%s/%s", tracing, name);
	105	return file;
	106	}
	107
	108	static void put_tracing_file(char *file)
	109	{
	110	free(file);
	111	}
	112
	113	static ssize_t write_or_die(const void *buf, size_t len)
	114	{
	115	int ret;
	116
	117	ret = write(output_fd, buf, len);
	118	if (ret < 0)
	119	die("writing to '%s'", output_file);
	120
	121	return ret;
	122	}
	123
	124	int bigendian(void)
	125	{
	126	unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
	127	unsigned int *ptr;
	128
65014ab3	129	ptr = (unsigned int )(void )str;
52050943 SR	130	return *ptr == 0x01020304;
	131	}
	132
259032bf SR	133	/* unfortunately, you can not stat debugfs or proc files for size */
259032bf SR	134	static void record_file(const char *file, size_t hdr_sz)
52050943 SR	135	{
52050943 SR	136	unsigned long long size = 0;
259032bf SR	137	char buf[BUFSIZ], *sizep;
	138	off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
	139	int r, fd;
52050943 SR	140
	141	fd = open(file, O_RDONLY);
	142	if (fd < 0)
	143	die("Can't read '%s'", file);
52050943	144
259032bf	145	/* put in zeros for file size, then fill true size later */
29208e57 JO	146	if (hdr_sz)
29208e57 JO	147	write_or_die(&size, hdr_sz);
52050943 SR	148
	149	do {
	150	r = read(fd, buf, BUFSIZ);
259032bf	151	if (r > 0) {
52050943	152	size += r;
259032bf SR	153	write_or_die(buf, r);
259032bf SR	154	}
52050943	155	} while (r > 0);
52050943 SR	156	close(fd);
52050943 SR	157
259032bf SR	158	/* ugh, handle big-endian hdr_size == 4 */
	159	sizep = (char*)&size;
	160	if (bigendian())
	161	sizep += sizeof(u64) - hdr_sz;
	162
29208e57	163	if (hdr_sz && pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0)
259032bf	164	die("writing to %s", output_file);
52050943 SR	165	}
	166
	167	static void read_header_files(void)
	168	{
52050943	169	char *path;
259032bf	170	struct stat st;
52050943 SR	171
52050943 SR	172	path = get_tracing_file("events/header_page");
259032bf	173	if (stat(path, &st) < 0)
52050943 SR	174	die("can't read '%s'", path);
52050943 SR	175
52050943	176	write_or_die("header_page", 12);
259032bf	177	record_file(path, 8);
52050943 SR	178	put_tracing_file(path);
	179
	180	path = get_tracing_file("events/header_event");
259032bf	181	if (stat(path, &st) < 0)
52050943 SR	182	die("can't read '%s'", path);
52050943 SR	183
52050943	184	write_or_die("header_event", 13);
259032bf	185	record_file(path, 8);
52050943 SR	186	put_tracing_file(path);
	187	}
	188
1ef2ed10 FW	189	static bool name_in_tp_list(char sys, struct tracepoint_path tps)
	190	{
	191	while (tps) {
	192	if (!strcmp(sys, tps->name))
	193	return true;
	194	tps = tps->next;
	195	}
	196
	197	return false;
	198	}
	199
	200	static void copy_event_system(const char sys, struct tracepoint_path tps)
52050943	201	{
52050943 SR	202	struct dirent *dent;
	203	struct stat st;
	204	char *format;
	205	DIR *dir;
	206	int count = 0;
	207	int ret;
	208
	209	dir = opendir(sys);
	210	if (!dir)
	211	die("can't read directory '%s'", sys);
	212
	213	while ((dent = readdir(dir))) {
659d8cfb UD	214	if (dent->d_type != DT_DIR \|\|
659d8cfb UD	215	strcmp(dent->d_name, ".") == 0 \|\|
1ef2ed10 FW	216	strcmp(dent->d_name, "..") == 0 \|\|
1ef2ed10 FW	217	!name_in_tp_list(dent->d_name, tps))
52050943 SR	218	continue;
	219	format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
	220	sprintf(format, "%s/%s/format", sys, dent->d_name);
	221	ret = stat(format, &st);
	222	free(format);
	223	if (ret < 0)
	224	continue;
	225	count++;
	226	}
	227
	228	write_or_die(&count, 4);
	229
	230	rewinddir(dir);
	231	while ((dent = readdir(dir))) {
659d8cfb UD	232	if (dent->d_type != DT_DIR \|\|
659d8cfb UD	233	strcmp(dent->d_name, ".") == 0 \|\|
1ef2ed10 FW	234	strcmp(dent->d_name, "..") == 0 \|\|
1ef2ed10 FW	235	!name_in_tp_list(dent->d_name, tps))
52050943 SR	236	continue;
	237	format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
	238	sprintf(format, "%s/%s/format", sys, dent->d_name);
	239	ret = stat(format, &st);
	240
259032bf SR	241	if (ret >= 0)
259032bf SR	242	record_file(format, 8);
52050943 SR	243
	244	free(format);
	245	}
9967411e	246	closedir(dir);
52050943 SR	247	}
52050943 SR	248
1ef2ed10	249	static void read_ftrace_files(struct tracepoint_path *tps)
52050943 SR	250	{
	251	char *path;
	252
	253	path = get_tracing_file("events/ftrace");
	254
1ef2ed10	255	copy_event_system(path, tps);
52050943 SR	256
	257	put_tracing_file(path);
	258	}
	259
1ef2ed10 FW	260	static bool system_in_tp_list(char sys, struct tracepoint_path tps)
	261	{
	262	while (tps) {
	263	if (!strcmp(sys, tps->system))
	264	return true;
	265	tps = tps->next;
	266	}
	267
	268	return false;
	269	}
	270
	271	static void read_event_files(struct tracepoint_path *tps)
52050943 SR	272	{
	273	struct dirent *dent;
	274	struct stat st;
	275	char *path;
	276	char *sys;
	277	DIR *dir;
	278	int count = 0;
	279	int ret;
	280
	281	path = get_tracing_file("events");
	282
	283	dir = opendir(path);
	284	if (!dir)
	285	die("can't read directory '%s'", path);
	286
	287	while ((dent = readdir(dir))) {
659d8cfb UD	288	if (dent->d_type != DT_DIR \|\|
659d8cfb UD	289	strcmp(dent->d_name, ".") == 0 \|\|
52050943	290	strcmp(dent->d_name, "..") == 0 \|\|
1ef2ed10 FW	291	strcmp(dent->d_name, "ftrace") == 0 \|\|
1ef2ed10 FW	292	!system_in_tp_list(dent->d_name, tps))
52050943	293	continue;
659d8cfb	294	count++;
52050943 SR	295	}
	296
	297	write_or_die(&count, 4);
	298
	299	rewinddir(dir);
	300	while ((dent = readdir(dir))) {
659d8cfb UD	301	if (dent->d_type != DT_DIR \|\|
659d8cfb UD	302	strcmp(dent->d_name, ".") == 0 \|\|
52050943	303	strcmp(dent->d_name, "..") == 0 \|\|
1ef2ed10 FW	304	strcmp(dent->d_name, "ftrace") == 0 \|\|
1ef2ed10 FW	305	!system_in_tp_list(dent->d_name, tps))
52050943 SR	306	continue;
	307	sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
	308	sprintf(sys, "%s/%s", path, dent->d_name);
	309	ret = stat(sys, &st);
	310	if (ret >= 0) {
659d8cfb UD	311	write_or_die(dent->d_name, strlen(dent->d_name) + 1);
659d8cfb UD	312	copy_event_system(sys, tps);
52050943 SR	313	}
	314	free(sys);
	315	}
	316
9967411e	317	closedir(dir);
52050943 SR	318	put_tracing_file(path);
	319	}
	320
	321	static void read_proc_kallsyms(void)
	322	{
259032bf	323	unsigned int size;
52050943 SR	324	const char *path = "/proc/kallsyms";
	325	struct stat st;
	326	int ret;
	327
	328	ret = stat(path, &st);
	329	if (ret < 0) {
	330	/* not found */
	331	size = 0;
	332	write_or_die(&size, 4);
	333	return;
	334	}
259032bf	335	record_file(path, 4);
52050943 SR	336	}
	337
	338	static void read_ftrace_printk(void)
	339	{
259032bf	340	unsigned int size;
6706ccf8	341	char *path;
52050943 SR	342	struct stat st;
	343	int ret;
	344
	345	path = get_tracing_file("printk_formats");
	346	ret = stat(path, &st);
	347	if (ret < 0) {
	348	/* not found */
	349	size = 0;
	350	write_or_die(&size, 4);
6706ccf8	351	goto out;
52050943	352	}
259032bf SR	353	record_file(path, 4);
259032bf SR	354
6706ccf8 LZ	355	out:
6706ccf8 LZ	356	put_tracing_file(path);
52050943 SR	357	}
52050943 SR	358
1ef2ed10	359	static struct tracepoint_path *
69aad6f1	360	get_tracepoints_path(struct list_head *pattrs)
1ef2ed10 FW	361	{
1ef2ed10 FW	362	struct tracepoint_path path, *ppath = &path;
69aad6f1 ACM	363	struct perf_evsel *pos;
69aad6f1 ACM	364	int nr_tracepoints = 0;
1ef2ed10	365
69aad6f1 ACM	366	list_for_each_entry(pos, pattrs, node) {
69aad6f1 ACM	367	if (pos->attr.type != PERF_TYPE_TRACEPOINT)
1ef2ed10	368	continue;
e2561368	369	++nr_tracepoints;
69aad6f1	370	ppath->next = tracepoint_id_to_path(pos->attr.config);
1ef2ed10 FW	371	if (!ppath->next)
	372	die("%s\n", "No memory to alloc tracepoints list");
	373	ppath = ppath->next;
	374	}
	375
e2561368	376	return nr_tracepoints > 0 ? path.next : NULL;
1ef2ed10	377	}
e2561368	378
29208e57 JO	379	static void
	380	put_tracepoints_path(struct tracepoint_path *tps)
	381	{
	382	while (tps) {
	383	struct tracepoint_path *t = tps;
	384
	385	tps = tps->next;
	386	free(t->name);
	387	free(t->system);
	388	free(t);
	389	}
	390	}
	391
69aad6f1	392	bool have_tracepoints(struct list_head *pattrs)
63e0c771	393	{
69aad6f1	394	struct perf_evsel *pos;
db620b1c	395
69aad6f1 ACM	396	list_for_each_entry(pos, pattrs, node)
69aad6f1 ACM	397	if (pos->attr.type == PERF_TYPE_TRACEPOINT)
db620b1c TZ	398	return true;
	399
	400	return false;
63e0c771 TZ	401	}
63e0c771 TZ	402
29208e57	403	static void tracing_data_header(void)
52050943	404	{
29208e57	405	char buf[20];
52050943	406
29208e57	407	/* just guessing this is someone's birthday.. ;) */
52050943 SR	408	buf[0] = 23;
	409	buf[1] = 8;
	410	buf[2] = 68;
	411	memcpy(buf + 3, "tracing", 7);
	412
	413	write_or_die(buf, 10);
	414
	415	write_or_die(VERSION, strlen(VERSION) + 1);
	416
	417	/* save endian */
	418	if (bigendian())
	419	buf[0] = 1;
	420	else
	421	buf[0] = 0;
	422
aaf045f7 SR	423	read_trace_init(buf[0], buf[0]);
aaf045f7 SR	424
52050943 SR	425	write_or_die(buf, 1);
	426
	427	/* save size of long */
	428	buf[0] = sizeof(long);
	429	write_or_die(buf, 1);
	430
	431	/* save page_size */
52050943	432	write_or_die(&page_size, 4);
29208e57 JO	433	}
	434
	435	struct tracing_data tracing_data_get(struct list_head pattrs,
	436	int fd, bool temp)
	437	{
	438	struct tracepoint_path *tps;
	439	struct tracing_data *tdata;
	440
	441	output_fd = fd;
	442
	443	tps = get_tracepoints_path(pattrs);
	444	if (!tps)
	445	return NULL;
52050943	446
29208e57 JO	447	tdata = malloc_or_die(sizeof(*tdata));
	448	tdata->temp = temp;
	449	tdata->size = 0;
	450
	451	if (temp) {
	452	int temp_fd;
	453
	454	snprintf(tdata->temp_file, sizeof(tdata->temp_file),
	455	"/tmp/perf-XXXXXX");
	456	if (!mkstemp(tdata->temp_file))
	457	die("Can't make temp file");
	458
	459	temp_fd = open(tdata->temp_file, O_RDWR);
	460	if (temp_fd < 0)
	461	die("Can't read '%s'", tdata->temp_file);
	462
	463	/*
	464	* Set the temp file the default output, so all the
	465	* tracing data are stored into it.
	466	*/
	467	output_fd = temp_fd;
	468	}
	469
	470	tracing_data_header();
52050943	471	read_header_files();
1ef2ed10 FW	472	read_ftrace_files(tps);
1ef2ed10 FW	473	read_event_files(tps);
52050943 SR	474	read_proc_kallsyms();
52050943 SR	475	read_ftrace_printk();
e2561368	476
29208e57 JO	477	/*
	478	* All tracing data are stored by now, we can restore
	479	* the default output file in case we used temp file.
	480	*/
	481	if (temp) {
	482	tdata->size = lseek(output_fd, 0, SEEK_CUR);
	483	close(output_fd);
	484	output_fd = fd;
	485	}
	486
	487	put_tracepoints_path(tps);
	488	return tdata;
52050943	489	}
9215545e	490
29208e57	491	void tracing_data_put(struct tracing_data *tdata)
9215545e	492	{
29208e57 JO	493	if (tdata->temp) {
	494	record_file(tdata->temp_file, 0);
	495	unlink(tdata->temp_file);
	496	}
9215545e	497
29208e57 JO	498	free(tdata);
29208e57 JO	499	}
9215545e	500
29208e57 JO	501	int read_tracing_data(int fd, struct list_head *pattrs)
	502	{
	503	struct tracing_data *tdata;
9215545e	504
29208e57 JO	505	/*
	506	* We work over the real file, so we can write data
	507	* directly, no temp file is needed.
	508	*/
	509	tdata = tracing_data_get(pattrs, fd, false);
	510	if (!tdata)
	511	return -ENOMEM;
	512
	513	tracing_data_put(tdata);
	514	return 0;
9215545e	515	}