glibc/stdlib/bug-getcontext.c

/* BZ 12420 */

#include <errno.h>
#include <fenv.h>
#include <stdio.h>
#include <stdlib.h>
#include <ucontext.h>
#include <libc-diag.h>

static int
do_test (void)
{
  if (FE_ALL_EXCEPT == 0)
    {
      printf("Skipping test; no support for FP exceptions.\n");
      return 0;
    }

  int except_mask = 0;
#ifdef FE_DIVBYZERO
  except_mask |= FE_DIVBYZERO;
#endif
#ifdef FE_INVALID
  except_mask |= FE_INVALID;
#endif
#ifdef FE_OVERFLOW
  except_mask |= FE_OVERFLOW;
#endif
#ifdef FE_UNDERFLOW
  except_mask |= FE_UNDERFLOW;
#endif
  int status = feenableexcept (except_mask);

  except_mask = fegetexcept ();
  if (except_mask == -1)
    {
      printf("\nBefore getcontext(): fegetexcept returned: %d\n",
	     except_mask);
      return 1;
    }

  ucontext_t ctx;
  status = getcontext(&ctx);
  if (status)
    {
      printf("\ngetcontext failed, errno: %d.\n", errno);
      return 1;
    }

  printf ("\nDone with getcontext()!\n");
  fflush (NULL);

  /* On nios2 and tilepro, GCC 5 warns that except_mask may be used
     uninitialized.  Because it is always initialized and nothing in
     this test ever calls setcontext (a setcontext call could result
     in local variables being clobbered on the second return from
     getcontext), in fact an uninitialized use is not possible.  */
  DIAG_PUSH_NEEDS_COMMENT;
  DIAG_IGNORE_NEEDS_COMMENT (5, "-Wmaybe-uninitialized");
  int mask = fegetexcept ();
  if (mask != except_mask)
    {
      printf("\nAfter getcontext(): fegetexcept returned: %d, expected: %d.\n",
	     mask, except_mask);
      return 1;
    }

  printf("\nAt end fegetexcept() returned %d, expected: %d.\n",
	 mask, except_mask);
  DIAG_POP_NEEDS_COMMENT;

  return 0;
}

#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"