我通过代码处理SIGSEGV:如何获得使用_Unwind_Backtrace fullstacktrace上SIGSEGV
int C()
{
int *i = NULL;
*i = 10; // Crash there
}
int B()
{
return C();
}
int A()
{
return B();
}
int main(void)
{
struct sigaction handler;
memset(&handler,0,sizeof(handler));
handler.sa_sigaction = handler_func;
handler.sa_flags = SA_SIGINFO;
sigaction(SIGSEGV,&handler,NULL);
return(C());
}
如果处理代码是:
static int handler_func(int signal, siginfo_t info, void* rserved)
{
const void* stack[MAX_DEPTH];
StackCrowlState state;
state.addr = stack;
state.count = MAX_DEPTH;
_Unwind_Reason_Code code = _Unwind_Backtrace(trace_func,&state);
printf("Stack trace count: %d, code: %d\n",MAX_DEPTH - state.count, code);
kill(getpid(),SIGKILL);
}
static _Unwind_Reason_Code trace_func(void* context, void* arg)
{
StackCrowlState *state = (StackCrowlState *)arg;
if(state->count>0)
{
void *ip = (void *)_Unwind_GetIP(context);
if(ip)
{
state->addr[0] = ip;
state->count--;
state->addr++;
}
}
return(_URC_NO_REASON);
}
但trace_func这里只调用一次,并只显示在_Unwind_Backtrace调用。是否有可能使用_Unwind_Backtrace获取导致SIGSEGV信号的代码堆栈跟踪?
日Thnx
除了在使用GCC,因而有'_Unwind_Backtrace',但不是GNU库,因而没有'backtrace'和'backtrace_symbols_fd'平台。 – 2012-11-22 13:11:39