signals.c

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/* signal handlers */

#include "fb.h"
#include <signal.h>

#if defined( HOST_WIN32 )
#include <windows.h>

static LPTOP_LEVEL_EXCEPTION_FILTER old_excpfilter;

/* low-level signal handler for Windows */
static __stdcall LONG exception_filter( LPEXCEPTION_POINTERS info )
{

        switch( info->ExceptionRecord->ExceptionCode )
        {
        case EXCEPTION_ACCESS_VIOLATION:
        case EXCEPTION_STACK_OVERFLOW:
                raise( SIGSEGV );
            break;

        case EXCEPTION_FLT_DIVIDE_BY_ZERO:
        case EXCEPTION_FLT_OVERFLOW:
        case EXCEPTION_INT_DIVIDE_BY_ZERO:
        case EXCEPTION_INT_OVERFLOW:
                raise( SIGFPE );
                break;
        }

        return old_excpfilter( info );
}
#endif

typedef struct _FB_SIGHANDLER {
        int             errnum;
        void    (*oldhnd)(int);
} FB_SIGHANDLER;

static FB_SIGHANDLER sigTb[NSIG];

#define FB_SETUPSIGNAL(n,h)                             \
    sigTb[n].oldhnd = signal( n, h );           \
    sigTb[n].errnum = FB_RTERROR_##n;

static void gen_handler( int sig )
{
        FB_ERRHANDLER handler;

        /* don't cause another exception */
        if( (sig < 0) || (sig >= NSIG) || (sigTb[sig].errnum == FB_RTERROR_OK) )
        {
                raise( sig );
                return;
        }

        /* call user handler if any defined */
        handler = fb_ErrorThrowEx( sigTb[sig].errnum, -1, NULL, NULL, NULL );
        if( handler != NULL )
                handler( );

        /* if the user handler returned, exit */
        fb_End( sigTb[sig].errnum );
}

FBCALL void fb_InitSignals( void )
{
        memset( sigTb, 0, sizeof(sigTb) );

        FB_SETUPSIGNAL(SIGABRT, gen_handler)
        FB_SETUPSIGNAL(SIGFPE, gen_handler)
        FB_SETUPSIGNAL(SIGILL, gen_handler)
        FB_SETUPSIGNAL(SIGSEGV, gen_handler)
        FB_SETUPSIGNAL(SIGTERM, gen_handler)
        FB_SETUPSIGNAL(SIGINT, gen_handler)
#ifdef SIGQUIT
        FB_SETUPSIGNAL(SIGQUIT, gen_handler)
#endif

#if defined( HOST_WIN32 )
        old_excpfilter = SetUnhandledExceptionFilter( exception_filter );
#endif
}