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76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/* Test of controlling the floating-point environment.
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Copyright (C) 2023-2026 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2023. */
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#include <config.h>
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/* Specification. */
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#include <fenv.h>
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#include "fpe-trapping.h"
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#include "macros.h"
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/* musl libc does not support floating-point exception trapping, even where
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the hardware supports it. See
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<https://wiki.musl-libc.org/functional-differences-from-glibc.html> */
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#if HAVE_FPE_TRAPPING && (!MUSL_LIBC || GNULIB_FEENABLEEXCEPT)
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/* Test that feupdateenv(), unlike fesetenv(), can trigger traps. */
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int
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main ()
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{
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fenv_t env1;
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/* Get to a known initial state. */
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ASSERT (feclearexcept (FE_ALL_EXCEPT) == 0);
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/* Enable trapping on FE_INVALID. */
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if (sigfpe_on_invalid () < 0)
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{
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fputs ("Skipping test: trapping floating-point exceptions are not supported on this machine.\n", stderr);
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return 77;
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}
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/* Save the current environment in env1. */
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ASSERT (fegetenv (&env1) == 0);
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/* Go back to the default environment. */
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ASSERT (fesetenv (FE_DFL_ENV) == 0);
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/* Modify the current environment. */
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ASSERT (feraiseexcept (FE_INVALID) == 0);
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/* Go back to env1.
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Since the exceptions flag FE_INVALID is currently set, and since
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env1 has trapping on FE_INVALID enabled, this should trap. */
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ASSERT (feupdateenv (&env1) == 0);
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return test_exit_status;
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}
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#else
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int
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main ()
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{
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fputs ("Skipping test: feenableexcept not available\n", stderr);
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return 77;
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}
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#endif
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