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 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"