stdlib/bug-getcontext.c

   1 /* BZ 12420 */
   2
   3 #include <errno.h>
   4 #include <fenv.h>
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <ucontext.h>
   8 #include <libc-diag.h>
   9
  10 static int
  11 do_test (void)
  12 {
  13   if (FE_ALL_EXCEPT == 0)
  14     {
  15       printf("Skipping test; no support for FP exceptions.\n");
  16       return 0;
  17     }
  18
  19   int except_mask = 0;
  20 #ifdef FE_DIVBYZERO
  21   except_mask |= FE_DIVBYZERO;
  22 #endif
  23 #ifdef FE_INVALID
  24   except_mask |= FE_INVALID;
  25 #endif
  26 #ifdef FE_OVERFLOW
  27   except_mask |= FE_OVERFLOW;
  28 #endif
  29 #ifdef FE_UNDERFLOW
  30   except_mask |= FE_UNDERFLOW;
  31 #endif
  32   int status = feenableexcept (except_mask);
  33
  34   except_mask = fegetexcept ();
  35   if (except_mask == -1)
  36     {
  37       printf("\nBefore getcontext(): fegetexcept returned: %d\n",
  38              except_mask);
  39       return 1;
  40     }
  41
  42   ucontext_t ctx;
  43   status = getcontext(&ctx);
  44   if (status)
  45     {
  46       printf("\ngetcontext failed, errno: %d.\n", errno);
  47       return 1;
  48     }
  49
  50   printf ("\nDone with getcontext()!\n");
  51   fflush (NULL);
  52
  53   /* On nios2 and tilepro, GCC 5 warns that except_mask may be used
  54      uninitialized.  Because it is always initialized and nothing in
  55      this test ever calls setcontext (a setcontext call could result
  56      in local variables being clobbered on the second return from
  57      getcontext), in fact an uninitialized use is not possible.  */
  58   DIAG_PUSH_NEEDS_COMMENT;
  59   DIAG_IGNORE_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
  60   int mask = fegetexcept ();
  61   if (mask != except_mask)
  62     {
  63       printf("\nAfter getcontext(): fegetexcept returned: %d, expected: %d.\n",
  64              mask, except_mask);
  65       return 1;
  66     }
  67
  68   printf("\nAt end fegetexcept() returned %d, expected: %d.\n",
  69          mask, except_mask);
  70   DIAG_POP_NEEDS_COMMENT;
  71
  72   return 0;
  73 }
  74
  75 #define TEST_FUNCTION do_test ()
  76 #include "../test-skeleton.c"