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>
36 #include "trace-event.h"
41 static ssize_t trace_data_size;
44 static int __do_read(int fd, void *buf, int size)
49 int ret = read(fd, buf, size);
55 int retw = write(STDOUT_FILENO, buf, ret);
57 if (retw <= 0 || retw != ret) {
58 pr_debug("repiping input file");
70 static int do_read(void *data, int size)
74 r = __do_read(input_fd, data, size);
76 pr_debug("reading input file (size expected=%d received=%d)",
86 /* If it fails, the next read will report it */
87 static void skip(int size)
93 r = size > BUFSIZ ? BUFSIZ : size;
99 static unsigned int read4(struct pevent *pevent)
103 if (do_read(&data, 4) < 0)
105 return __data2host4(pevent, data);
108 static unsigned long long read8(struct pevent *pevent)
110 unsigned long long data;
112 if (do_read(&data, 8) < 0)
114 return __data2host8(pevent, data);
117 static char *read_string(void)
126 r = read(input_fd, &c, 1);
128 pr_debug("reading input file");
138 int retw = write(STDOUT_FILENO, &c, 1);
140 if (retw <= 0 || retw != r) {
141 pr_debug("repiping input file string");
152 trace_data_size += size;
156 memcpy(str, buf, size);
161 static int read_proc_kallsyms(struct pevent *pevent)
165 size = read4(pevent);
169 * Just skip it, now that we configure libtraceevent to use the
170 * tools/perf/ symbol resolver.
172 * We need to skip it so that we can continue parsing old perf.data
173 * files, that contains this /proc/kallsyms payload.
175 * Newer perf.data files will have just the 4-bytes zeros "kallsyms
176 * payload", so that older tools can continue reading it and interpret
177 * it as "no kallsyms payload is present".
179 lseek(input_fd, size, SEEK_CUR);
180 trace_data_size += size;
184 static int read_ftrace_printk(struct pevent *pevent)
189 /* it can have 0 size */
190 size = read4(pevent);
194 buf = malloc(size + 1);
198 if (do_read(buf, size) < 0) {
205 parse_ftrace_printk(pevent, buf, size);
211 static int read_header_files(struct pevent *pevent)
213 unsigned long long size;
218 if (do_read(buf, 12) < 0)
221 if (memcmp(buf, "header_page", 12) != 0) {
222 pr_debug("did not read header page");
226 size = read8(pevent);
228 header_page = malloc(size);
229 if (header_page == NULL)
232 if (do_read(header_page, size) < 0) {
233 pr_debug("did not read header page");
238 if (!pevent_parse_header_page(pevent, header_page, size,
239 pevent_get_long_size(pevent))) {
241 * The commit field in the page is of type long,
242 * use that instead, since it represents the kernel.
244 pevent_set_long_size(pevent, pevent->header_page_size_size);
248 if (do_read(buf, 13) < 0)
251 if (memcmp(buf, "header_event", 13) != 0) {
252 pr_debug("did not read header event");
256 size = read8(pevent);
262 static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
269 pr_debug("memory allocation failure\n");
273 ret = do_read(buf, size);
275 pr_debug("error reading ftrace file.\n");
279 ret = parse_ftrace_file(pevent, buf, size);
281 pr_debug("error parsing ftrace file.\n");
287 static int read_event_file(struct pevent *pevent, char *sys,
288 unsigned long long size)
295 pr_debug("memory allocation failure\n");
299 ret = do_read(buf, size);
305 ret = parse_event_file(pevent, buf, size, sys);
307 pr_debug("error parsing event file.\n");
313 static int read_ftrace_files(struct pevent *pevent)
315 unsigned long long size;
320 count = read4(pevent);
322 for (i = 0; i < count; i++) {
323 size = read8(pevent);
324 ret = read_ftrace_file(pevent, size);
331 static int read_event_files(struct pevent *pevent)
333 unsigned long long size;
340 systems = read4(pevent);
342 for (i = 0; i < systems; i++) {
347 count = read4(pevent);
349 for (x=0; x < count; x++) {
350 size = read8(pevent);
351 ret = read_event_file(pevent, sys, size);
359 static int read_saved_cmdline(struct pevent *pevent)
361 unsigned long long size;
365 /* it can have 0 size */
366 size = read8(pevent);
370 buf = malloc(size + 1);
372 pr_debug("memory allocation failure\n");
376 ret = do_read(buf, size);
378 pr_debug("error reading saved cmdlines\n");
382 parse_saved_cmdline(pevent, buf, size);
389 ssize_t trace_report(int fd, struct trace_event *tevent, bool __repipe)
392 char test[] = { 23, 8, 68 };
394 int show_version = 0;
402 struct pevent *pevent = NULL;
408 if (do_read(buf, 3) < 0)
410 if (memcmp(buf, test, 3) != 0) {
411 pr_debug("no trace data in the file");
415 if (do_read(buf, 7) < 0)
417 if (memcmp(buf, "tracing", 7) != 0) {
418 pr_debug("not a trace file (missing 'tracing' tag)");
422 version = read_string();
426 printf("version = %s\n", version);
428 if (do_read(buf, 1) < 0) {
432 file_bigendian = buf[0];
433 host_bigendian = bigendian();
435 if (trace_event__init(tevent)) {
436 pr_debug("trace_event__init failed");
440 pevent = tevent->pevent;
442 pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
443 pevent_set_file_bigendian(pevent, file_bigendian);
444 pevent_set_host_bigendian(pevent, host_bigendian);
446 if (do_read(buf, 1) < 0)
448 file_long_size = buf[0];
450 file_page_size = read4(pevent);
454 pevent_set_long_size(pevent, file_long_size);
455 pevent_set_page_size(pevent, file_page_size);
457 err = read_header_files(pevent);
460 err = read_ftrace_files(pevent);
463 err = read_event_files(pevent);
466 err = read_proc_kallsyms(pevent);
469 err = read_ftrace_printk(pevent);
472 if (atof(version) >= 0.6) {
473 err = read_saved_cmdline(pevent);
478 size = trace_data_size;
482 pevent_print_funcs(pevent);
483 } else if (show_printk) {
484 pevent_print_printk(pevent);
491 trace_event__cleanup(tevent);