164 lines
3.9 KiB
C
164 lines
3.9 KiB
C
/**
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* This source file is used to print out a stack-trace when your program
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* segfaults. It is relatively reliable and spot-on accurate.
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*
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* This code is in the public domain. Use it as you see fit, some credit
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* would be appreciated, but is not a prerequisite for usage. Feedback
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* on it's use would encourage further development and maintenance.
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*
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* Due to a bug in gcc-4.x.x you currently have to compile as C++ if you want
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* demangling to work.
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*
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* Please note that it's been ported into my ULS library, thus the check for
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*
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* Author: Jaco Kroon <jaco@kroon.co.za>
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*
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* Copyright (C) 2005 - 2009 Jaco Kroon
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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/* Bug in gcc prevents from using CPP_DEMANGLE in pure "C" */
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#if !defined(__cplusplus) && !defined(NO_CPP_DEMANGLE)
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#define NO_CPP_DEMANGLE
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#endif
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#include <memory.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <signal.h>
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#include <errno.h>
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#include <ucontext.h>
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#include <dlfcn.h>
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#include "logger.h"
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#include "shared_func.h"
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#ifndef NO_CPP_DEMANGLE
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#include <cxxabi.h>
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#ifdef __cplusplus
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using __cxxabiv1::__cxa_demangle;
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#endif
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#endif
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#if defined(REG_RIP)
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# define SIGSEGV_STACK_IA64
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# define REGFORMAT "%016lx"
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#elif defined(REG_EIP)
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# define SIGSEGV_STACK_X86
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# define REGFORMAT "%08x"
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#else
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# define SIGSEGV_STACK_GENERIC
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# define REGFORMAT "%x"
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#endif
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extern char g_exe_name[256];
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void signal_stack_trace_print(int signum, siginfo_t *info, void *ptr)
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{
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static const char *si_codes[3] = {"", "SEGV_MAPERR", "SEGV_ACCERR"};
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int i, f = 0;
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ucontext_t *ucontext;
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Dl_info dlinfo;
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void **bp = NULL;
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void *ip = NULL;
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char cmd[256];
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char buff[256];
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char output[8 * 1024];
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char *pCurrent;
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pCurrent = output;
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ucontext = (ucontext_t*)ptr;
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pCurrent += sprintf(pCurrent, "Segmentation Fault!\n");
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pCurrent += sprintf(pCurrent, "\tinfo.si_signo = %d\n", signum);
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pCurrent += sprintf(pCurrent, "\tinfo.si_errno = %d\n", info->si_errno);
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pCurrent += sprintf(pCurrent, "\tinfo.si_code = %d (%s)\n", \
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info->si_code, si_codes[info->si_code]);
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pCurrent += sprintf(pCurrent, "\tinfo.si_addr = %p\n", info->si_addr);
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for(i = 0; i < NGREG; i++)
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{
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pCurrent += sprintf(pCurrent, "\treg[%02d] = 0x"REGFORMAT"\n",
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i, ucontext->uc_mcontext.gregs[i]);
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}
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#ifndef SIGSEGV_NOSTACK
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#if defined(SIGSEGV_STACK_IA64) || defined(SIGSEGV_STACK_X86)
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#if defined(SIGSEGV_STACK_IA64)
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ip = (void*)ucontext->uc_mcontext.gregs[REG_RIP];
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bp = (void**)ucontext->uc_mcontext.gregs[REG_RBP];
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#elif defined(SIGSEGV_STACK_X86)
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ip = (void*)ucontext->uc_mcontext.gregs[REG_EIP];
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bp = (void**)ucontext->uc_mcontext.gregs[REG_EBP];
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#endif
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pCurrent += sprintf(pCurrent, "\tStack trace:\n");
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while(bp && ip)
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{
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const char *symname;
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#ifndef NO_CPP_DEMANGLE
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int status;
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char * tmp;
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#endif
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if(!dladdr(ip, &dlinfo))
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{
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break;
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}
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symname = dlinfo.dli_sname;
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#ifndef NO_CPP_DEMANGLE
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tmp = __cxa_demangle(symname, NULL, 0, &status);
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if (status == 0 && tmp)
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{
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symname = tmp;
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}
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#endif
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sprintf(cmd, "addr2line -e %s %p", g_exe_name, ip);
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if (getExecResult(cmd, buff, sizeof(buff)) != 0)
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{
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*buff = '0';
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}
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pCurrent += sprintf(pCurrent, "\t\t% 2d: %p <%s+%lu> (%s in %s)\n",
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++f, ip, symname,
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(unsigned long)ip-(unsigned long)dlinfo.dli_saddr,
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trim_right(buff), dlinfo.dli_fname);
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#ifndef NO_CPP_DEMANGLE
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if (tmp)
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{
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free(tmp);
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}
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#endif
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if(dlinfo.dli_sname && !strcmp(dlinfo.dli_sname, "main"))
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{
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break;
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}
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ip = bp[1];
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bp = (void**)bp[0];
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}
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#else
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pCurrent += sprintf(pCurrent, "\tStack trace (non-dedicated):\n");
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sz = backtrace(bt, 20);
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strings = backtrace_symbols(bt, sz);
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for(i = 0; i < sz; ++i)
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{
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pCurrent += sprintf(pCurrent, "\t\t%s\n", strings[i]);
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}
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#endif
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pCurrent += sprintf(pCurrent, "\tEnd of stack trace.\n");
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#else
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pCurrent += sprintf(pCurrent, "\tNot printing stack strace.\n");
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#endif
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log_it_ex(&g_log_context, LOG_CRIT, output, pCurrent - output);
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}
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