181 lines
4.9 KiB
C
181 lines
4.9 KiB
C
/*
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* wee-backtrace.c - backtrace after a segfault
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*
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* Copyright (C) 2003-2020 Sébastien Helleu <flashcode@flashtux.org>
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*
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* This file is part of WeeChat, the extensible chat client.
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*
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* WeeChat is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* WeeChat is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with WeeChat. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#ifndef __USE_GNU
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#define __USE_GNU
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#endif
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#include <dlfcn.h>
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#ifdef HAVE_BACKTRACE
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#include <execinfo.h>
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#endif
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#include "weechat.h"
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#include "wee-backtrace.h"
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#include "wee-log.h"
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#include "wee-string.h"
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#include "wee-version.h"
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#include "../plugins/plugin.h"
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/*
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* Displays a backtrace line on standard error output and in WeeChat log.
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*/
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void
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weechat_backtrace_printf (const char *message, ...)
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{
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weechat_va_format (message);
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if (vbuffer)
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{
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string_fprintf (stderr, "%s\n", vbuffer);
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log_printf ("%s", vbuffer);
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free (vbuffer);
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}
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}
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/*
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* Displays function name and line with a backtrace address.
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*/
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void
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weechat_backtrace_addr2line (int number, void *address, const char *symbol)
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{
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#ifdef HAVE_BACKTRACE
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int rc;
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Dl_info info;
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const void *addr;
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FILE *output;
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char cmd_line[1024];
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char line[1024], *ptr_line, *pos;
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char function_name[1024];
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rc = dladdr (address, &info);
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if ((rc == 0) || !info.dli_fname || !info.dli_fname[0])
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{
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weechat_backtrace_printf ("%03d %s", number, symbol);
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return;
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}
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addr = address;
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if (info.dli_fbase >= (const void *) 0x40000000)
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addr = (void *)((unsigned long)((const char *) addr) -
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(unsigned long) info.dli_fbase);
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/* use addr2line to find symbols names */
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snprintf (cmd_line, sizeof (cmd_line),
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"addr2line --functions --demangle -e $(which %s) %p",
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info.dli_fname, addr);
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output = popen (cmd_line, "r");
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if (!output)
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{
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weechat_backtrace_printf ("%03d %s", number, symbol);
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return;
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}
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function_name[0] = '\0';
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while (!feof (output))
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{
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ptr_line = fgets (line, sizeof (line) - 1, output);
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if (ptr_line && ptr_line[0])
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{
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pos = strchr (ptr_line, '\n');
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if (pos)
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pos[0] = '\0';
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if (strchr (ptr_line, ':'))
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{
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weechat_backtrace_printf (
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"%03d %s%s%s%s",
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number,
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ptr_line,
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(function_name[0]) ? " [function " : "",
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function_name,
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(function_name[0]) ? "]" : "");
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function_name[0] = '\0';
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}
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else
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{
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if (function_name[0])
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weechat_backtrace_printf ("%03d %s",
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number, function_name);
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snprintf (function_name, sizeof (function_name),
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"%s", ptr_line);
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}
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}
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}
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if (function_name[0])
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weechat_backtrace_printf ("%03d %s",
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number, function_name);
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pclose (output);
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#else
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/* make C compiler happy */
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(void) number;
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(void) address;
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(void) symbol;
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/* no backtrace possible, we display nothing */
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#endif /* HAVE_BACKTRACE */
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}
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/*
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* Displays backtrace (function called when a SIGSEGV is received).
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*/
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void
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weechat_backtrace ()
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{
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#ifdef HAVE_BACKTRACE
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void *trace[BACKTRACE_MAX];
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int trace_size, i;
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char **symbols;
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#endif /* HAVE_BACKTRACE */
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weechat_backtrace_printf ("======= WeeChat backtrace =======");
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weechat_backtrace_printf ("(written by WeeChat %s, compiled on %s %s)",
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version_get_version_with_git (),
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version_get_compilation_date (),
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version_get_compilation_time ());
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#ifdef HAVE_BACKTRACE
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trace_size = backtrace (trace, BACKTRACE_MAX);
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symbols = backtrace_symbols (trace, trace_size);
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for (i = 0; i < trace_size; i++)
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{
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weechat_backtrace_addr2line (i + 1, trace[i], symbols[i]);
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}
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#else
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weechat_backtrace_printf (" No backtrace info (no debug info available "
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"or no backtrace possible on your system).");
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#endif /* HAVE_BACKTRACE */
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weechat_backtrace_printf ("======= End of backtrace =======");
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}
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