gnu/dist/gcc4/gcc/testsuite/gcc.c-torture/execute/20001229-1.c

   1 /* This testcase originally provoked an unaligned access fault on Alpha.
   2
   3    Since Digital Unix and Linux (and probably others) by default fix
   4    these up in the kernel, the failure was not visible unless one
   5    is sitting at the console examining logs.
   6
   7    So: If we know how, ask the kernel to deliver SIGBUS instead so
   8    that the test case visibly fails.  */
   9
  10 #if defined(__alpha__) && (defined(__linux__) || defined(__osf__))
  11 #ifdef __linux__
  12 #include <asm/sysinfo.h>
  13 #include <asm/unistd.h>
  14
  15 static inline int
  16 setsysinfo(unsigned long op, void *buffer, unsigned long size,
  17            int *start, void *arg, unsigned long flag)
  18 {
  19   syscall(__NR_osf_setsysinfo, op, buffer, size, start, arg, flag);
  20 }
  21
  22 #else
  23 #include <sys/sysinfo.h>
  24 #include <sys/proc.h>
  25 #endif
  26
  27 static void __attribute__((constructor))
  28 trap_unaligned(void)
  29 {
  30   unsigned int buf[2];
  31   buf[0] = SSIN_UACPROC;
  32   buf[1] = UAC_SIGBUS | UAC_NOPRINT;
  33   setsysinfo(SSI_NVPAIRS, buf, 1, 0, 0, 0);
  34 }
  35 #endif /* alpha */
  36
  37 void foo(char *a, char *b) { }
  38
  39 void showinfo()
  40 {
  41     char uname[33] = "", tty[38] = "/dev/";
  42     foo(uname, tty);
  43 }
  44
  45 int main()
  46 {
  47   showinfo ();
  48   exit (0);
  49 }