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glibc/math/test-fenv.c

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/* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@arthur.rhein-neckar.de> and
Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Tests for ISO C99 7.6: Floating-point environment */
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <complex.h>
#include <math.h>
#include <float.h>
#include <fenv.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/resource.h>
/*
Since not all architectures might define all exceptions, we define
a private set and map accordingly.
*/
#define NO_EXC 0
#define INEXACT_EXC 0x1
#define DIVBYZERO_EXC 0x2
#define UNDERFLOW_EXC 0x04
#define OVERFLOW_EXC 0x08
#define INVALID_EXC 0x10
#define ALL_EXC \
(INEXACT_EXC | DIVBYZERO_EXC | UNDERFLOW_EXC | OVERFLOW_EXC | \
INVALID_EXC)
static int count_errors;
/* Test whether a given exception was raised. */
static void
test_single_exception (short int exception,
short int exc_flag,
fexcept_t fe_flag,
const char *flag_name)
{
if (exception & exc_flag)
{
if (fetestexcept (fe_flag))
printf (" Pass: Exception \"%s\" is set\n", flag_name);
else
{
printf (" Fail: Exception \"%s\" is not set\n", flag_name);
++count_errors;
}
}
else
{
if (fetestexcept (fe_flag))
{
printf (" Fail: Exception \"%s\" is set\n", flag_name);
++count_errors;
}
else
{
printf (" Pass: Exception \"%s\" is not set\n", flag_name);
}
}
}
static void
test_exceptions (const char *test_name, short int exception,
int ignore_inexact)
{
printf ("Test: %s\n", test_name);
#ifdef FE_DIVBYZERO
test_single_exception (exception, DIVBYZERO_EXC, FE_DIVBYZERO,
"DIVBYZERO");
#endif
#ifdef FE_INVALID
test_single_exception (exception, INVALID_EXC, FE_INVALID,
"INVALID");
#endif
#ifdef FE_INEXACT
if (!ignore_inexact)
test_single_exception (exception, INEXACT_EXC, FE_INEXACT,
"INEXACT");
#endif
#ifdef FE_UNDERFLOW
test_single_exception (exception, UNDERFLOW_EXC, FE_UNDERFLOW,
"UNDERFLOW");
#endif
#ifdef FE_OVERFLOW
test_single_exception (exception, OVERFLOW_EXC, FE_OVERFLOW,
"OVERFLOW");
#endif
}
static void
print_rounding (int rounding)
{
switch (rounding)
{
#ifdef FE_TONEAREST
case FE_TONEAREST:
printf ("TONEAREST");
break;
#endif
#ifdef FE_UPWARD
case FE_UPWARD:
printf ("UPWARD");
break;
#endif
#ifdef FE_DOWNWARD
case FE_DOWNWARD:
printf ("DOWNWARD");
break;
#endif
#ifdef FE_TOWARDZERO
case FE_TOWARDZERO:
printf ("TOWARDZERO");
break;
#endif
}
printf (".\n");
}
static void
test_rounding (const char *test_name, int rounding_mode)
{
int curr_rounding = fegetround ();
printf ("Test: %s\n", test_name);
if (curr_rounding == rounding_mode)
{
printf (" Pass: Rounding mode is ");
print_rounding (curr_rounding);
}
else
{
++count_errors;
printf (" Fail: Rounding mode is ");
print_rounding (curr_rounding);
}
}
static void
set_single_exc (const char *test_name, int fe_exc, fexcept_t exception)
{
char str[200];
/* The standard allows the inexact exception to be set together with the
underflow and overflow exceptions. So ignore the inexact flag if the
others are raised. */
int ignore_inexact = (fe_exc & (UNDERFLOW_EXC | OVERFLOW_EXC)) != 0;
strcpy (str, test_name);
strcat (str, ": set flag, with rest not set");
feclearexcept (FE_ALL_EXCEPT);
feraiseexcept (exception);
test_exceptions (str, fe_exc, ignore_inexact);
strcpy (str, test_name);
strcat (str, ": clear flag, rest also unset");
feclearexcept (exception);
test_exceptions (str, NO_EXC, ignore_inexact);
strcpy (str, test_name);
strcat (str, ": set flag, with rest set");
feraiseexcept (FE_ALL_EXCEPT ^ exception);
feraiseexcept (exception);
test_exceptions (str, ALL_EXC, 0);
strcpy (str, test_name);
strcat (str, ": clear flag, leave rest set");
feclearexcept (exception);
test_exceptions (str, ALL_EXC ^ fe_exc, 0);
}
static void
fe_tests (void)
{
/* clear all exceptions and test if all are cleared */
feclearexcept (FE_ALL_EXCEPT);
test_exceptions ("feclearexcept (FE_ALL_EXCEPT) clears all exceptions",
NO_EXC, 0);
/* raise all exceptions and test if all are raised */
feraiseexcept (FE_ALL_EXCEPT);
test_exceptions ("feraiseexcept (FE_ALL_EXCEPT) raises all exceptions",
ALL_EXC, 0);
feclearexcept (FE_ALL_EXCEPT);
#ifdef FE_DIVBYZERO
set_single_exc ("Set/Clear FE_DIVBYZERO", DIVBYZERO_EXC, FE_DIVBYZERO);
#endif
#ifdef FE_INVALID
set_single_exc ("Set/Clear FE_INVALID", INVALID_EXC, FE_INVALID);
#endif
#ifdef FE_INEXACT
set_single_exc ("Set/Clear FE_INEXACT", INEXACT_EXC, FE_INEXACT);
#endif
#ifdef FE_UNDERFLOW
set_single_exc ("Set/Clear FE_UNDERFLOW", UNDERFLOW_EXC, FE_UNDERFLOW);
#endif
#ifdef FE_OVERFLOW
set_single_exc ("Set/Clear FE_OVERFLOW", OVERFLOW_EXC, FE_OVERFLOW);
#endif
}
/* Test that program aborts with no masked interrupts */
static void
feenv_nomask_test (const char *flag_name, int fe_exc)
{
#if defined FE_NOMASK_ENV
int status;
pid_t pid;
fenv_t saved;
fegetenv (&saved);
errno = 0;
fesetenv (FE_NOMASK_ENV);
status = errno;
fesetenv (&saved);
if (status == ENOSYS)
{
printf ("Test: not testing FE_NOMASK_ENV, it isn't implemented.\n");
return;
}
printf ("Test: after fesetenv (FE_NOMASK_ENV) processes will abort\n");
printf (" when feraiseexcept (%s) is called.\n", flag_name);
pid = fork ();
if (pid == 0)
{
#ifdef RLIMIT_CORE
/* Try to avoid dumping core. */
struct rlimit core_limit;
core_limit.rlim_cur = 0;
core_limit.rlim_max = 0;
setrlimit (RLIMIT_CORE, &core_limit);
#endif
fesetenv (FE_NOMASK_ENV);
feraiseexcept (fe_exc);
exit (2);
}
else if (pid < 0)
{
if (errno != ENOSYS)
{
printf (" Fail: Could not fork.\n");
++count_errors;
}
else
printf (" `fork' not implemented, test ignored.\n");
}
else {
if (waitpid (pid, &status, 0) != pid)
{
printf (" Fail: waitpid call failed.\n");
++count_errors;
}
else if (WIFSIGNALED (status) && WTERMSIG (status) == SIGFPE)
printf (" Pass: Process received SIGFPE.\n");
else
{
printf (" Fail: Process didn't receive signal and exited with status %d.\n",
status);
++count_errors;
}
}
#endif
}
/* Test that program doesn't abort with default environment */
static void
feenv_mask_test (const char *flag_name, int fe_exc)
{
int status;
pid_t pid;
printf ("Test: after fesetenv (FE_DFL_ENV) processes will not abort\n");
printf (" when feraiseexcept (%s) is called.\n", flag_name);
pid = fork ();
if (pid == 0)
{
#ifdef RLIMIT_CORE
/* Try to avoid dumping core. */
struct rlimit core_limit;
core_limit.rlim_cur = 0;
core_limit.rlim_max = 0;
setrlimit (RLIMIT_CORE, &core_limit);
#endif
fesetenv (FE_DFL_ENV);
feraiseexcept (fe_exc);
exit (2);
}
else if (pid < 0)
{
if (errno != ENOSYS)
{
printf (" Fail: Could not fork.\n");
++count_errors;
}
else
printf (" `fork' not implemented, test ignored.\n");
}
else {
if (waitpid (pid, &status, 0) != pid)
{
printf (" Fail: waitpid call failed.\n");
++count_errors;
}
else if (WIFEXITED (status) && WEXITSTATUS (status) == 2)
printf (" Pass: Process exited normally.\n");
else
{
printf (" Fail: Process exited abnormally with status %d.\n",
status);
++count_errors;
}
}
}
static void
feenv_tests (void)
{
#ifdef FE_DIVBYZERO
feenv_nomask_test ("FE_DIVBYZERO", FE_DIVBYZERO);
feenv_mask_test ("FE_DIVBYZERO", FE_DIVBYZERO);
#endif
#ifdef FE_INVALID
feenv_nomask_test ("FE_INVALID", FE_INVALID);
feenv_mask_test ("FE_INVALID", FE_INVALID);
#endif
#ifdef FE_INEXACT
feenv_nomask_test ("FE_INEXACT", FE_INEXACT);
feenv_mask_test ("FE_INEXACT", FE_INEXACT);
#endif
#ifdef FE_UNDERFLOW
feenv_nomask_test ("FE_UNDERFLOW", FE_UNDERFLOW);
feenv_mask_test ("FE_UNDERFLOW", FE_UNDERFLOW);
#endif
#ifdef FE_OVERFLOW
feenv_nomask_test ("FE_OVERFLOW", FE_OVERFLOW);
feenv_mask_test ("FE_OVERFLOW", FE_OVERFLOW);
#endif
fesetenv (FE_DFL_ENV);
}
/* IEC 559 and ISO C99 define a default startup environment */
static void
initial_tests (void)
{
test_exceptions ("Initially all exceptions should be cleared",
NO_EXC, 0);
test_rounding ("Rounding direction should be initalized to nearest",
FE_TONEAREST);
}
int
main (void)
{
initial_tests ();
fe_tests ();
feenv_tests ();
if (count_errors)
{
printf ("\n%d errors occurred.\n", count_errors);
exit (1);
}
printf ("\n All tests passed successfully.\n");
exit (0);
}
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