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/*
* wee-backtrace.c - backtrace after a segfault
*
* Copyright (C) 2003-2017 Sébastien Helleu <flashcode@flashtux.org>
*
* This file is part of WeeChat, the extensible chat client.
*
* WeeChat 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; either version 3 of the License, or
* (at your option) any later version.
*
* WeeChat 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 WeeChat. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#ifndef __USE_GNU
#define __USE_GNU
#endif
#include <dlfcn.h>
#ifdef HAVE_BACKTRACE
#include <execinfo.h>
#endif
#include "weechat.h"
#include "wee-backtrace.h"
#include "wee-log.h"
#include "wee-string.h"
#include "wee-version.h"
#include "../plugins/plugin.h"
/*
* Displays a backtrace line on standard error output and in WeeChat log.
*/
void
weechat_backtrace_printf (const char *message, ...)
{
weechat_va_format (message);
if (vbuffer)
{
string_fprintf (stderr, "%s\n", vbuffer);
log_printf ("%s", vbuffer);
free (vbuffer);
}
}
/*
* Displays function name and line with a backtrace address.
*/
void
weechat_backtrace_addr2line (int number, void *address, const char *symbol)
{
#ifdef HAVE_BACKTRACE
int rc;
Dl_info info;
const void *addr;
FILE *output;
char cmd_line[1024];
char line[1024], *ptr_line, *pos;
char function_name[1024];
rc = dladdr (address, &info);
if ((rc == 0) || !info.dli_fname || !info.dli_fname[0])
{
weechat_backtrace_printf ("%03d %s", number, symbol);
return;
}
addr = address;
if (info.dli_fbase >= (const void *) 0x40000000)
addr = (void *)((unsigned long)((const char *) addr) -
(unsigned long) info.dli_fbase);
/* use addr2line to find symbols names */
snprintf (cmd_line, sizeof (cmd_line),
"addr2line --functions --demangle -e $(which %s) %p",
info.dli_fname, addr);
output = popen (cmd_line, "r");
if (!output)
{
weechat_backtrace_printf ("%03d %s", number, symbol);
return;
}
function_name[0] = '\0';
while (!feof (output))
{
ptr_line = fgets (line, sizeof (line) - 1, output);
if (ptr_line && ptr_line[0])
{
pos = strchr (ptr_line, '\n');
if (pos)
pos[0] = '\0';
if (strchr (ptr_line, ':'))
{
weechat_backtrace_printf (
"%03d %s%s%s%s",
number,
ptr_line,
(function_name[0]) ? " [function " : "",
function_name,
(function_name[0]) ? "]" : "");
function_name[0] = '\0';
}
else
{
if (function_name[0])
weechat_backtrace_printf ("%03d %s",
number, function_name);
snprintf (function_name, sizeof (function_name),
"%s", ptr_line);
}
}
}
if (function_name[0])
weechat_backtrace_printf ("%03d %s",
number, function_name);
pclose (output);
#else
/* make C compiler happy */
(void) number;
(void) address;
(void) symbol;
/* no backtrace possible, we display nothing */
#endif /* HAVE_BACKTRACE */
}
/*
* Displays backtrace (function called when a SIGSEGV is received).
*/
void
weechat_backtrace ()
{
#ifdef HAVE_BACKTRACE
void *trace[BACKTRACE_MAX];
int trace_size, i;
char **symbols;
#endif /* HAVE_BACKTRACE */
weechat_backtrace_printf ("======= WeeChat backtrace =======");
weechat_backtrace_printf ("(written by WeeChat %s, compiled on %s %s)",
version_get_version_with_git (),
version_get_compilation_date (),
version_get_compilation_time ());
#ifdef HAVE_BACKTRACE
trace_size = backtrace (trace, BACKTRACE_MAX);
symbols = backtrace_symbols (trace, trace_size);
for (i = 0; i < trace_size; i++)
{
weechat_backtrace_addr2line (i + 1, trace[i], symbols[i]);
}
#else
weechat_backtrace_printf (" No backtrace info (no debug info available "
"or no backtrace possible on your system).");
#endif /* HAVE_BACKTRACE */
weechat_backtrace_printf ("======= End of backtrace =======");
}
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