Linux catch hardware exception

#include <signal.h>
#include <setjmp.h>

jmp_buf env;
void (*prev_handler)(int);

void segv_handler(int signal)
{
    longjmp(env, 1);
}

/*
Macros to temporarily catch a segmentation fault.

Usage:

SEGV_TRY()
    // Risky code...
SEGV_CATCH()
    // Error handling...
SEGV_END()

// Other code...
*/
#define SEGV_TRY() \
    prev_handler = signal(SIGSEGV, segv_handler); \
    if (setjmp(env) == 0) {

// The previous signal handler should be restored as soon as possible.
// That's why it gets restored either at the end of the try block
// (successful execution) or at the beginning of the catch block
// (erroneous execution).
#define SEGV_CATCH() \
        signal(SIGSEGV, prev_handler); \
    } else { \
        signal(SIGSEGV, prev_handler);

#define SEGV_END() \
    }

/*
Macro to replace SEGV_CATCH() and SEGV_END(). A RuntimeError will be raised
in the error handling code.

Usage:

SEGV_TRY()
    // Risky code...
BOOST_SEGV_CATCH()

// Other code...
*/
#define BOOST_SEGV_CATCH() \
    SEGV_CATCH() \
        BOOST_RAISE_EXCEPTION(PyExc_RuntimeError, "Segmentation fault.") \
    SEGV_END()