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+/* __gmp_invalid_operation -- invalid floating point operation.
+
+ THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY. THEY'RE ALMOST
+ CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
+ FUTURE GNU MP RELEASES.
+
+Copyright 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 "config.h"
+
+#include <signal.h>
+#include <stdlib.h>
+
+#if HAVE_UNISTD_H
+#include <unistd.h> /* for getpid */
+#endif
+
+#include "gmp-impl.h"
+
+
+/* Incidentally, kill is not available on mingw, but that's ok, it has raise
+ and we'll be using that. */
+#if ! HAVE_RAISE
+#define raise(sig) kill (getpid(), sig)
+#endif
+
+
+/* __gmp_invalid_operation is for an invalid floating point operation, like
+ mpz_set_d on a NaN or Inf. It's done as a subroutine to minimize code in
+ places raising an exception.
+
+ feraiseexcept(FE_INVALID) is not used here, since unfortunately on most
+ systems it would require libm.
+
+ Alternatives:
+
+ It might be possible to check whether a hardware "invalid operation" trap
+ is enabled or not before raising a signal. This would require all
+ callers to be prepared to continue with some bogus result. Bogus returns
+ are bad, but presumably an application disabling the trap is prepared for
+ that.
+
+ On some systems (eg. BSD) the signal handler can find out the reason for
+ a SIGFPE (overflow, invalid, div-by-zero, etc). Perhaps we could get
+ that into our raise too.
+
+ i386 GLIBC implements feraiseexcept(FE_INVALID) with an asm fdiv 0/0.
+ That would both respect the exceptions mask and give a reason code in a
+ BSD signal. */
+
+void
+__gmp_invalid_operation (void)
+{
+ raise (SIGFPE);
+ abort ();
+}