errno.c

/* gmp_errno, __gmp_exception -- exception handling and reporting.

   THE FUNCTIONS IN THIS FILE, APART FROM gmp_errno, ARE FOR INTERNAL USE
   ONLY.  THEY'RE ALMOST CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR
   DISAPPEAR COMPLETELY IN FUTURE GNU MP RELEASES.

Copyright 2000, 2001, 2003 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of either:

  * the GNU Lesser General Public License as published by the Free
    Software Foundation; either version 3 of the License, or (at your
    option) any later version.

or

  * the GNU General Public License as published by the Free Software
    Foundation; either version 2 of the License, or (at your option) any
    later version.

or both in parallel, as here.

The GNU MP Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received copies of the GNU General Public License and the
GNU Lesser General Public License along with the GNU MP Library.  If not,
see https://www.gnu.org/licenses/.  */

#include <stdlib.h>

#include <signal.h>

#include "gmp-impl.h"

int gmp_errno = 0;


/* Use SIGFPE on systems which have it. Otherwise, deliberate divide
   by zero, which triggers an exception on most systems. On those
   where it doesn't, for example power and powerpc, use abort instead. */
void
__gmp_exception (int error_bit)
{
  gmp_errno |= error_bit;
#ifdef SIGFPE
  raise (SIGFPE);
#else
  __gmp_junk = 10 / __gmp_0;
#endif
  abort ();
}


/* These functions minimize the amount of code required in functions raising
   exceptions.  Since they're "noreturn" and don't take any parameters, a
   test and call might even come out as a simple conditional jump.  */
void
__gmp_sqrt_of_negative (void)
{
  __gmp_exception (GMP_ERROR_SQRT_OF_NEGATIVE);
}
void
__gmp_divide_by_zero (void)
{
  __gmp_exception (GMP_ERROR_DIVISION_BY_ZERO);
}