最终解决分段错误（C ++）

Question

I'm using ncurses and whenever I get a segfault, ncurses doesn't properly release control of the terminal (because endwin() was never called). I set up a signal handler:

void handler(int signum) {
    endwin();
    exit(EXIT_FAILURE);
}

but the problem with this is that the segfault is ignored, as opposed to delayed until after endwin(). I'm fairly new to C++; can segfaults be caught like exceptions, so that I could have a finally block? Or is there someway to resend the segfault from inside the handler?

Answer 1

Segfault is undefined behavior. You must find it and fix it. Don't worry about ncurses not releasing the terminal, and find and fix the bug.

Answer 2

From the signal man page:

According to POSIX, the behavior of a process is undefined after it ignores a SIGFPE, SIGILL, or SIGSEGV signal that was not generated by kill(2) or raise(3).

Trying to do anything after a seg fault is crazy. It's like the air-bag in your activating after a crash and you keep on driving, because, well, you have an air bag and it will keep you safe in a crash. Papering over this with a handler is not the way.

One way would be to make your program take input from a file or stub out the output. You could also try remotely attaching to a process with gdb . Never done it but it might be worth a try.