492 lines
9.4 KiB
C
492 lines
9.4 KiB
C
|
/*
|
||
|
* Copyright (C) 2008,2009, 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
|
||
|
*
|
||
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
||
|
*/
|
||
|
#define _GNU_SOURCE
|
||
|
#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 <pthread.h>
|
||
|
#include <fcntl.h>
|
||
|
#include <unistd.h>
|
||
|
#include <ctype.h>
|
||
|
#include <errno.h>
|
||
|
|
||
|
#include "trace-event.h"
|
||
|
|
||
|
|
||
|
#define VERSION "0.5"
|
||
|
|
||
|
#define _STR(x) #x
|
||
|
#define STR(x) _STR(x)
|
||
|
#define MAX_PATH 256
|
||
|
|
||
|
#define TRACE_CTRL "tracing_on"
|
||
|
#define TRACE "trace"
|
||
|
#define AVAILABLE "available_tracers"
|
||
|
#define CURRENT "current_tracer"
|
||
|
#define ITER_CTRL "trace_options"
|
||
|
#define MAX_LATENCY "tracing_max_latency"
|
||
|
|
||
|
unsigned int page_size;
|
||
|
|
||
|
static const char *output_file = "trace.info";
|
||
|
static int output_fd;
|
||
|
|
||
|
struct event_list {
|
||
|
struct event_list *next;
|
||
|
const char *event;
|
||
|
};
|
||
|
|
||
|
struct events {
|
||
|
struct events *sibling;
|
||
|
struct events *children;
|
||
|
struct events *next;
|
||
|
char *name;
|
||
|
};
|
||
|
|
||
|
|
||
|
|
||
|
static void die(const char *fmt, ...)
|
||
|
{
|
||
|
va_list ap;
|
||
|
int ret = errno;
|
||
|
|
||
|
if (errno)
|
||
|
perror("trace-cmd");
|
||
|
else
|
||
|
ret = -1;
|
||
|
|
||
|
va_start(ap, fmt);
|
||
|
fprintf(stderr, " ");
|
||
|
vfprintf(stderr, fmt, ap);
|
||
|
va_end(ap);
|
||
|
|
||
|
fprintf(stderr, "\n");
|
||
|
exit(ret);
|
||
|
}
|
||
|
|
||
|
void *malloc_or_die(unsigned int size)
|
||
|
{
|
||
|
void *data;
|
||
|
|
||
|
data = malloc(size);
|
||
|
if (!data)
|
||
|
die("malloc");
|
||
|
return data;
|
||
|
}
|
||
|
|
||
|
static const char *find_debugfs(void)
|
||
|
{
|
||
|
static char debugfs[MAX_PATH+1];
|
||
|
static int debugfs_found;
|
||
|
char type[100];
|
||
|
FILE *fp;
|
||
|
|
||
|
if (debugfs_found)
|
||
|
return debugfs;
|
||
|
|
||
|
if ((fp = fopen("/proc/mounts","r")) == NULL)
|
||
|
die("Can't open /proc/mounts for read");
|
||
|
|
||
|
while (fscanf(fp, "%*s %"
|
||
|
STR(MAX_PATH)
|
||
|
"s %99s %*s %*d %*d\n",
|
||
|
debugfs, type) == 2) {
|
||
|
if (strcmp(type, "debugfs") == 0)
|
||
|
break;
|
||
|
}
|
||
|
fclose(fp);
|
||
|
|
||
|
if (strcmp(type, "debugfs") != 0)
|
||
|
die("debugfs not mounted, please mount");
|
||
|
|
||
|
debugfs_found = 1;
|
||
|
|
||
|
return debugfs;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* 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 *)str;
|
||
|
return *ptr == 0x01020304;
|
||
|
}
|
||
|
|
||
|
static unsigned long long copy_file_fd(int fd)
|
||
|
{
|
||
|
unsigned long long size = 0;
|
||
|
char buf[BUFSIZ];
|
||
|
int r;
|
||
|
|
||
|
do {
|
||
|
r = read(fd, buf, BUFSIZ);
|
||
|
if (r > 0) {
|
||
|
size += r;
|
||
|
write_or_die(buf, r);
|
||
|
}
|
||
|
} while (r > 0);
|
||
|
|
||
|
return size;
|
||
|
}
|
||
|
|
||
|
static unsigned long long copy_file(const char *file)
|
||
|
{
|
||
|
unsigned long long size = 0;
|
||
|
int fd;
|
||
|
|
||
|
fd = open(file, O_RDONLY);
|
||
|
if (fd < 0)
|
||
|
die("Can't read '%s'", file);
|
||
|
size = copy_file_fd(fd);
|
||
|
close(fd);
|
||
|
|
||
|
return size;
|
||
|
}
|
||
|
|
||
|
static unsigned long get_size_fd(int fd)
|
||
|
{
|
||
|
unsigned long long size = 0;
|
||
|
char buf[BUFSIZ];
|
||
|
int r;
|
||
|
|
||
|
do {
|
||
|
r = read(fd, buf, BUFSIZ);
|
||
|
if (r > 0)
|
||
|
size += r;
|
||
|
} while (r > 0);
|
||
|
|
||
|
lseek(fd, 0, SEEK_SET);
|
||
|
|
||
|
return size;
|
||
|
}
|
||
|
|
||
|
static unsigned long get_size(const char *file)
|
||
|
{
|
||
|
unsigned long long size = 0;
|
||
|
int fd;
|
||
|
|
||
|
fd = open(file, O_RDONLY);
|
||
|
if (fd < 0)
|
||
|
die("Can't read '%s'", file);
|
||
|
size = get_size_fd(fd);
|
||
|
close(fd);
|
||
|
|
||
|
return size;
|
||
|
}
|
||
|
|
||
|
static void read_header_files(void)
|
||
|
{
|
||
|
unsigned long long size, check_size;
|
||
|
char *path;
|
||
|
int fd;
|
||
|
|
||
|
path = get_tracing_file("events/header_page");
|
||
|
fd = open(path, O_RDONLY);
|
||
|
if (fd < 0)
|
||
|
die("can't read '%s'", path);
|
||
|
|
||
|
/* unfortunately, you can not stat debugfs files for size */
|
||
|
size = get_size_fd(fd);
|
||
|
|
||
|
write_or_die("header_page", 12);
|
||
|
write_or_die(&size, 8);
|
||
|
check_size = copy_file_fd(fd);
|
||
|
if (size != check_size)
|
||
|
die("wrong size for '%s' size=%lld read=%lld",
|
||
|
path, size, check_size);
|
||
|
put_tracing_file(path);
|
||
|
|
||
|
path = get_tracing_file("events/header_event");
|
||
|
fd = open(path, O_RDONLY);
|
||
|
if (fd < 0)
|
||
|
die("can't read '%s'", path);
|
||
|
|
||
|
size = get_size_fd(fd);
|
||
|
|
||
|
write_or_die("header_event", 13);
|
||
|
write_or_die(&size, 8);
|
||
|
check_size = copy_file_fd(fd);
|
||
|
if (size != check_size)
|
||
|
die("wrong size for '%s'", path);
|
||
|
put_tracing_file(path);
|
||
|
}
|
||
|
|
||
|
static void copy_event_system(const char *sys)
|
||
|
{
|
||
|
unsigned long long size, check_size;
|
||
|
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 (strcmp(dent->d_name, ".") == 0 ||
|
||
|
strcmp(dent->d_name, "..") == 0)
|
||
|
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 (strcmp(dent->d_name, ".") == 0 ||
|
||
|
strcmp(dent->d_name, "..") == 0)
|
||
|
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) {
|
||
|
/* unfortunately, you can not stat debugfs files for size */
|
||
|
size = get_size(format);
|
||
|
write_or_die(&size, 8);
|
||
|
check_size = copy_file(format);
|
||
|
if (size != check_size)
|
||
|
die("error in size of file '%s'", format);
|
||
|
}
|
||
|
|
||
|
free(format);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void read_ftrace_files(void)
|
||
|
{
|
||
|
char *path;
|
||
|
|
||
|
path = get_tracing_file("events/ftrace");
|
||
|
|
||
|
copy_event_system(path);
|
||
|
|
||
|
put_tracing_file(path);
|
||
|
}
|
||
|
|
||
|
static void read_event_files(void)
|
||
|
{
|
||
|
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 (strcmp(dent->d_name, ".") == 0 ||
|
||
|
strcmp(dent->d_name, "..") == 0 ||
|
||
|
strcmp(dent->d_name, "ftrace") == 0)
|
||
|
continue;
|
||
|
sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
|
||
|
sprintf(sys, "%s/%s", path, dent->d_name);
|
||
|
ret = stat(sys, &st);
|
||
|
free(sys);
|
||
|
if (ret < 0)
|
||
|
continue;
|
||
|
if (S_ISDIR(st.st_mode))
|
||
|
count++;
|
||
|
}
|
||
|
|
||
|
write_or_die(&count, 4);
|
||
|
|
||
|
rewinddir(dir);
|
||
|
while ((dent = readdir(dir))) {
|
||
|
if (strcmp(dent->d_name, ".") == 0 ||
|
||
|
strcmp(dent->d_name, "..") == 0 ||
|
||
|
strcmp(dent->d_name, "ftrace") == 0)
|
||
|
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) {
|
||
|
if (S_ISDIR(st.st_mode)) {
|
||
|
write_or_die(dent->d_name, strlen(dent->d_name) + 1);
|
||
|
copy_event_system(sys);
|
||
|
}
|
||
|
}
|
||
|
free(sys);
|
||
|
}
|
||
|
|
||
|
put_tracing_file(path);
|
||
|
}
|
||
|
|
||
|
static void read_proc_kallsyms(void)
|
||
|
{
|
||
|
unsigned int size, check_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;
|
||
|
}
|
||
|
size = get_size(path);
|
||
|
write_or_die(&size, 4);
|
||
|
check_size = copy_file(path);
|
||
|
if (size != check_size)
|
||
|
die("error in size of file '%s'", path);
|
||
|
|
||
|
}
|
||
|
|
||
|
static void read_ftrace_printk(void)
|
||
|
{
|
||
|
unsigned int size, check_size;
|
||
|
const 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);
|
||
|
return;
|
||
|
}
|
||
|
size = get_size(path);
|
||
|
write_or_die(&size, 4);
|
||
|
check_size = copy_file(path);
|
||
|
if (size != check_size)
|
||
|
die("error in size of file '%s'", path);
|
||
|
|
||
|
}
|
||
|
|
||
|
void read_tracing_data(void)
|
||
|
{
|
||
|
char buf[BUFSIZ];
|
||
|
|
||
|
output_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, 0644);
|
||
|
if (output_fd < 0)
|
||
|
die("creating file '%s'", output_file);
|
||
|
|
||
|
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;
|
||
|
|
||
|
write_or_die(buf, 1);
|
||
|
|
||
|
/* save size of long */
|
||
|
buf[0] = sizeof(long);
|
||
|
write_or_die(buf, 1);
|
||
|
|
||
|
/* save page_size */
|
||
|
page_size = getpagesize();
|
||
|
write_or_die(&page_size, 4);
|
||
|
|
||
|
read_header_files();
|
||
|
read_ftrace_files();
|
||
|
read_event_files();
|
||
|
read_proc_kallsyms();
|
||
|
read_ftrace_printk();
|
||
|
}
|