diff options
Diffstat (limited to 'src/H5detect.c')
| -rw-r--r-- | src/H5detect.c | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/src/H5detect.c b/src/H5detect.c index 5736846..0af2e9d 100644 --- a/src/H5detect.c +++ b/src/H5detect.c @@ -60,6 +60,7 @@ static unsigned long find_bias(int, int, int *, void *); static void precision (detected_t*); static void print_header(void); static size_t align_g[] = {1, 2, 4, 8, 16}; +static jmp_buf jbuf_g; /*------------------------------------------------------------------------- @@ -241,6 +242,31 @@ precision (detected_t *d) precision (&(INFO)); \ } +#if defined(HAVE_LONGJMP) && defined(HAVE_SIGNAL) +#define ALIGNMENT(TYPE,ALIGN) { \ + char *_buf=NULL; \ + volatile TYPE _val=0; \ + volatile size_t _ano=0; \ + void (*_handler)(int) = signal(SIGBUS, sigbus_handler); \ + \ + _buf = malloc(sizeof(TYPE)+align_g[NELMTS(align_g)-1]); \ + if (setjmp(jbuf_g)) _ano++; \ + if (_ano<NELMTS(align_g)) { \ + *((TYPE*)(_buf+align_g[_ano])) = _val; /*possible SIGBUS*/ \ + _val = *((TYPE*)(_buf+align_g[_ano])); /*possible SIGBUS*/ \ + (ALIGN)=align_g[_ano]; \ + } else { \ + (ALIGN)=0; \ + fprintf(stderr, "unable to calculate alignment for %s\n", #TYPE); \ + } \ + free(_buf); \ + signal(SIGBUS, _handler); /*restore original handler*/ \ +} +#else +#define ALIGNMENT(TYPE,ALIGN) (ALIGN)=0 +#endif + +#if 0 #if defined(HAVE_FORK) && defined(HAVE_WAITPID) #define ALIGNMENT(TYPE,ALIGN) { \ char *_buf; \ @@ -285,8 +311,33 @@ precision (detected_t *d) #else #define ALIGNMENT(TYPE,ALIGN) (ALIGN)=0 #endif +#endif - + +/*------------------------------------------------------------------------- + * Function: sigbus_handler + * + * Purpose: Handler for SIGBUS. We use signal() instead of sigaction() + * because it's more portable to non-Posix systems. Although + * it's not nearly as nice to work with, it does the job for + * this simple stuff. + * + * Return: Returns via longjmp to jbuf_g. + * + * Programmer: Robb Matzke + * Thursday, March 18, 1999 + * + * Modifications: + * + *------------------------------------------------------------------------- + */ +static void +sigbus_handler(int __unused__ signo) +{ + longjmp(jbuf_g, 1); + signal(SIGBUS, sigbus_handler); +} + /*------------------------------------------------------------------------- * Function: print_results |