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/* This is part of um-ViewOS
* The user-mode implementation of OSVIEW -- A Process with a View
*
* gdebug.c: debugging functions
*
* Copyright 2005 Ludovico Gardenghi
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* 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.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* $Id: gdebug.c 415 2007-11-29 18:16:54Z garden $
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <execinfo.h>
#include <stdarg.h>
#include <sys/types.h>
#include <unistd.h>
#include <dlfcn.h>
#include <errno.h>
#include <config.h>
//#include "defs.h"
#include "gdebug.h"
#ifdef MULTI_THREAD
#include <pthread.h>
#endif
FILE *gdebug_ofile = NULL;
#define BACKTRACE_INITIAL_SIZE 10
static void *libc_handle;
static int (*libc_fprintf)(FILE *stream, const char *format, ...);
static int (*libc_vfprintf)(FILE *stream, const char *format, va_list ap);
static FILE *(*libc_fopen)(const char *path, const char *mode);
static int (*libc_getpid)(void);
static void **backtrace_array = NULL;
static int backtrace_array_size = 0;
void gdebug_set_ofile(char* new_ofile)
{
gdebug_ofile = libc_fopen(new_ofile, "w");
if (!gdebug_ofile)
libc_fprintf(stderr, "gdebug: can't open log file %s: %s. Using stderr.\n",
new_ofile, strerror(errno));
else
setlinebuf(gdebug_ofile);
}
void fgdebug(FILE *ofile, int gdebug_level, int level, const char *file, const int line, const char *func, const char *fmt, ...)
{
va_list ap;
if (gdebug_level >= level)
{
va_start(ap, fmt);
#ifdef _PTHREAD_H
libc_fprintf(ofile, "[%d:%lu] %s:%d %s(): ", libc_getpid(), pthread_self(), file, line, func);
#else
libc_fprintf(ofile, "[%d] %s:%d %s(): ", libc_getpid(), file, line, func);
#endif
libc_vfprintf(ofile, fmt, ap);
libc_fprintf(ofile, "\n");
va_end(ap);
}
}
void fgmsg(FILE *ofile, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
libc_vfprintf(ofile, fmt, ap);
libc_fprintf(ofile, "\n");
va_end(ap);
}
void fghexdump(FILE *ofile, int gdebug_level, int level, const char *file, const int line, const char *func, char* text, int len)
{
int i;
if (gdebug_level >= level)
{
#ifdef _PTHREAD_H
libc_fprintf(ofile, "[%d:%lu] %s:%d %s(): [%d] ", libc_getpid(), pthread_self(), file, line, func, len);
#else
libc_fprintf(ofile, "[%d] %s:%d %s(): [%d] ", libc_getpid(), file, line, func, len);
#endif
for (i = 0; i < len; i++)
{
if ((i != 0) && ((i % 4) == 0))
libc_fprintf(ofile, " ");
libc_fprintf(ofile, "%02x", (unsigned char)text[i]);
}
libc_fprintf(ofile, "\n");
}
}
void fgbacktrace(FILE *ofile, int gdebug_level, int level, const char *file, const int line, const char *func, int maxdepth)
{
int i;
int btdepth;
char **btstrings;
/* The first entry is always ignored (it's the call to fgbacktrace), the
* user wants maxdepth entries so we must add 1 */
maxdepth++;
if (gdebug_level >= level)
{
if (maxdepth > backtrace_array_size)
{
backtrace_array_size = maxdepth;
backtrace_array = realloc(backtrace_array, sizeof(void*) * backtrace_array_size);
}
btdepth = backtrace(backtrace_array, maxdepth);
btstrings = backtrace_symbols(backtrace_array, btdepth);
if (!btstrings)
{
fgdebug(ofile, gdebug_level, level, file, line, func, "can't obtain backtrace");
return;
}
/* 1 and not 0 (0 is fgbacktrace and it's not interesting) */
for (i = 1; i < btdepth; i++)
fgdebug(ofile, gdebug_level, level, file, line, func, "BT: #%d %s", i-1, btstrings[i]);
}
}
static void __attribute__ ((constructor)) init()
{
libc_handle = dlopen("libc.so.6", RTLD_LAZY);
if (!libc_handle)
{
fprintf(stderr, "dlopen: %s", dlerror());
fprintf(stderr, "dlopen in gdebug failed, reverting to original fprintf/vfprintf/fopen\n");
libc_fprintf = fprintf;
libc_vfprintf = vfprintf;
libc_fopen = fopen;
libc_getpid = getpid;
}
else
{
libc_fprintf = dlsym(libc_handle, "fprintf");
libc_vfprintf = dlsym(libc_handle, "vfprintf");
libc_fopen = dlsym(libc_handle, "fopen");
libc_getpid = dlsym(libc_handle,"getpid");
if (!libc_fprintf || !libc_vfprintf || !libc_fopen || !libc_getpid)
{
fprintf(stderr, "dlsym: %s", dlerror());
fprintf(stderr, "dlsym in gdebug failed, reverting to original fprintf/vfprintf/fopen\n");
libc_fprintf = fprintf;
libc_vfprintf = vfprintf;
libc_fopen = fopen;
libc_getpid = getpid;
}
}
backtrace_array = malloc(sizeof(void*) * BACKTRACE_INITIAL_SIZE);
backtrace_array_size = BACKTRACE_INITIAL_SIZE;
}
static void __attribute__ ((destructor)) fini()
{
dlclose(libc_handle);
if (backtrace_array)
free(backtrace_array);
backtrace_array = NULL;
backtrace_array_size = 0;
}
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