2 * Copyright (C) 2009, Steven Rostedt <srostedt@redhat.com>
4 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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!)
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.
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
19 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
26 #include <sys/types.h>
37 #include "trace-event.h"
42 static ssize_t trace_data_size;
45 static int __do_read(int fd, void *buf, int size)
50 int ret = read(fd, buf, size);
56 int retw = write(STDOUT_FILENO, buf, ret);
58 if (retw <= 0 || retw != ret) {
59 pr_debug("repiping input file");
71 static int do_read(void *data, int size)
75 r = __do_read(input_fd, data, size);
77 pr_debug("reading input file (size expected=%d received=%d)",
87 /* If it fails, the next read will report it */
88 static void skip(int size)
94 r = size > BUFSIZ ? BUFSIZ : size;
100 static unsigned int read4(struct pevent *pevent)
104 if (do_read(&data, 4) < 0)
106 return __data2host4(pevent, data);
109 static unsigned long long read8(struct pevent *pevent)
111 unsigned long long data;
113 if (do_read(&data, 8) < 0)
115 return __data2host8(pevent, data);
118 static char *read_string(void)
127 r = read(input_fd, &c, 1);
129 pr_debug("reading input file");
139 int retw = write(STDOUT_FILENO, &c, 1);
141 if (retw <= 0 || retw != r) {
142 pr_debug("repiping input file string");
153 trace_data_size += size;
157 memcpy(str, buf, size);
162 static int read_proc_kallsyms(struct pevent *pevent)
166 size = read4(pevent);
170 * Just skip it, now that we configure libtraceevent to use the
171 * tools/perf/ symbol resolver.
173 * We need to skip it so that we can continue parsing old perf.data
174 * files, that contains this /proc/kallsyms payload.
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".
180 lseek(input_fd, size, SEEK_CUR);
181 trace_data_size += size;
185 static int read_ftrace_printk(struct pevent *pevent)
190 /* it can have 0 size */
191 size = read4(pevent);
199 if (do_read(buf, size) < 0) {
204 parse_ftrace_printk(pevent, buf, size);
210 static int read_header_files(struct pevent *pevent)
212 unsigned long long size;
217 if (do_read(buf, 12) < 0)
220 if (memcmp(buf, "header_page", 12) != 0) {
221 pr_debug("did not read header page");
225 size = read8(pevent);
227 header_page = malloc(size);
228 if (header_page == NULL)
231 if (do_read(header_page, size) < 0) {
232 pr_debug("did not read header page");
237 if (!pevent_parse_header_page(pevent, header_page, size,
238 pevent_get_long_size(pevent))) {
240 * The commit field in the page is of type long,
241 * use that instead, since it represents the kernel.
243 pevent_set_long_size(pevent, pevent->header_page_size_size);
247 if (do_read(buf, 13) < 0)
250 if (memcmp(buf, "header_event", 13) != 0) {
251 pr_debug("did not read header event");
255 size = read8(pevent);
261 static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
269 if (do_read(buf, size) < 0) {
274 parse_ftrace_file(pevent, buf, size);
279 static int read_event_file(struct pevent *pevent, char *sys,
280 unsigned long long size)
288 if (do_read(buf, size) < 0) {
293 parse_event_file(pevent, buf, size, sys);
298 static int read_ftrace_files(struct pevent *pevent)
300 unsigned long long size;
305 count = read4(pevent);
307 for (i = 0; i < count; i++) {
308 size = read8(pevent);
309 ret = read_ftrace_file(pevent, size);
316 static int read_event_files(struct pevent *pevent)
318 unsigned long long size;
325 systems = read4(pevent);
327 for (i = 0; i < systems; i++) {
332 count = read4(pevent);
334 for (x=0; x < count; x++) {
335 size = read8(pevent);
336 ret = read_event_file(pevent, sys, size);
344 ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
347 char test[] = { 23, 8, 68 };
349 int show_version = 0;
357 struct pevent *pevent = NULL;
363 if (do_read(buf, 3) < 0)
365 if (memcmp(buf, test, 3) != 0) {
366 pr_debug("no trace data in the file");
370 if (do_read(buf, 7) < 0)
372 if (memcmp(buf, "tracing", 7) != 0) {
373 pr_debug("not a trace file (missing 'tracing' tag)");
377 version = read_string();
381 printf("version = %s\n", version);
384 if (do_read(buf, 1) < 0)
386 file_bigendian = buf[0];
387 host_bigendian = bigendian();
389 if (trace_event__init(tevent)) {
390 pr_debug("trace_event__init failed");
394 pevent = tevent->pevent;
396 pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
397 pevent_set_file_bigendian(pevent, file_bigendian);
398 pevent_set_host_bigendian(pevent, host_bigendian);
400 if (do_read(buf, 1) < 0)
402 file_long_size = buf[0];
404 file_page_size = read4(pevent);
408 pevent_set_long_size(pevent, file_long_size);
409 pevent_set_page_size(pevent, file_page_size);
411 err = read_header_files(pevent);
414 err = read_ftrace_files(pevent);
417 err = read_event_files(pevent);
420 err = read_proc_kallsyms(pevent);
423 err = read_ftrace_printk(pevent);
427 size = trace_data_size;
431 pevent_print_funcs(pevent);
432 } else if (show_printk) {
433 pevent_print_printk(pevent);
440 trace_event__cleanup(tevent);