math/test-fenv.c

   1 /* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Andreas Jaeger <aj@arthur.rhein-neckar.de> and
   4    Ulrich Drepper <drepper@cygnus.com>, 1997.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 /* Tests for ISO C 9X 7.6: Floating-point environment  */
  22
  23 #ifndef _GNU_SOURCE
  24 # define _GNU_SOURCE
  25 #endif
  26
  27 #include <complex.h>
  28 #include <math.h>
  29 #include <float.h>
  30 #include <fenv.h>
  31
  32 #include <errno.h>
  33 #include <signal.h>
  34 #include <stdlib.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38 #include <sys/wait.h>
  39 #include <sys/resource.h>
  40
  41 /*
  42   Since not all architectures might define all exceptions, we define
  43   a private set and map accordingly.
  44 */
  45 #define NO_EXC 0
  46 #define INEXACT_EXC 0x1
  47 #define DIVBYZERO_EXC 0x2
  48 #define UNDERFLOW_EXC 0x04
  49 #define OVERFLOW_EXC 0x08
  50 #define INVALID_EXC 0x10
  51 #define ALL_EXC \
  52         (INEXACT_EXC | DIVBYZERO_EXC | UNDERFLOW_EXC | OVERFLOW_EXC | \
  53          INVALID_EXC)
  54
  55 static int count_errors;
  56
  57 /* Test whether a given exception was raised.  */
  58 static void
  59 test_single_exception (short int exception,
  60                        short int exc_flag,
  61                        fexcept_t fe_flag,
  62                        const char *flag_name)
  63 {
  64   if (exception & exc_flag)
  65     {
  66       if (fetestexcept (fe_flag))
  67         printf ("  Pass: Exception \"%s\" is set\n", flag_name);
  68       else
  69         {
  70           printf ("  Fail: Exception \"%s\" is not set\n", flag_name);
  71           ++count_errors;
  72         }
  73     }
  74   else
  75     {
  76       if (fetestexcept (fe_flag))
  77         {
  78           printf ("  Fail: Exception \"%s\" is set\n", flag_name);
  79           ++count_errors;
  80         }
  81       else
  82         {
  83           printf ("  Pass: Exception \"%s\" is not set\n", flag_name);
  84         }
  85     }
  86 }
  87
  88 static void
  89 test_exceptions (const char *test_name, short int exception,
  90                  int ignore_inexact)
  91 {
  92   printf ("Test: %s\n", test_name);
  93 #ifdef FE_DIVBYZERO
  94   test_single_exception (exception, DIVBYZERO_EXC, FE_DIVBYZERO,
  95                          "DIVBYZERO");
  96 #endif
  97 #ifdef FE_INVALID
  98   test_single_exception (exception, INVALID_EXC, FE_INVALID,
  99                          "INVALID");
 100 #endif
 101 #ifdef FE_INEXACT
 102   if (!ignore_inexact)
 103     test_single_exception (exception, INEXACT_EXC, FE_INEXACT,
 104                            "INEXACT");
 105 #endif
 106 #ifdef FE_UNDERFLOW
 107   test_single_exception (exception, UNDERFLOW_EXC, FE_UNDERFLOW,
 108                          "UNDERFLOW");
 109 #endif
 110 #ifdef FE_OVERFLOW
 111   test_single_exception (exception, OVERFLOW_EXC, FE_OVERFLOW,
 112                          "OVERFLOW");
 113 #endif
 114 }
 115
 116 static void
 117 print_rounding (int rounding)
 118 {
 119
 120   switch (rounding)
 121     {
 122 #ifdef FE_TONEAREST
 123     case FE_TONEAREST:
 124       printf ("TONEAREST");
 125       break;
 126 #endif
 127 #ifdef FE_UPWARD
 128     case FE_UPWARD:
 129       printf ("UPWARD");
 130       break;
 131 #endif
 132 #ifdef FE_DOWNWARD
 133     case FE_DOWNWARD:
 134       printf ("DOWNWARD");
 135       break;
 136 #endif
 137 #ifdef FE_TOWARDZERO
 138     case FE_TOWARDZERO:
 139       printf ("TOWARDZERO");
 140       break;
 141 #endif
 142     }
 143   printf (".\n");
 144 }
 145
 146
 147 static void
 148 test_rounding (const char *test_name, int rounding_mode)
 149 {
 150   int curr_rounding = fegetround ();
 151
 152   printf ("Test: %s\n", test_name);
 153   if (curr_rounding == rounding_mode)
 154     {
 155       printf ("  Pass: Rounding mode is ");
 156       print_rounding (curr_rounding);
 157     }
 158   else
 159     {
 160       ++count_errors;
 161       printf ("  Fail: Rounding mode is ");
 162       print_rounding (curr_rounding);
 163     }
 164 }
 165
 166
 167 static void
 168 set_single_exc (const char *test_name, int fe_exc, fexcept_t exception)
 169 {
 170   char str[200];
 171   /* The standard allows the inexact exception to be set together with the
 172      underflow and overflow exceptions.  So ignore the inexact flag if the
 173      others are raised.  */
 174   int ignore_inexact = (fe_exc & (UNDERFLOW_EXC | OVERFLOW_EXC)) != 0;
 175
 176   strcpy (str, test_name);
 177   strcat (str, ": set flag, with rest not set");
 178   feclearexcept (FE_ALL_EXCEPT);
 179   feraiseexcept (exception);
 180   test_exceptions (str, fe_exc, ignore_inexact);
 181
 182   strcpy (str, test_name);
 183   strcat (str, ": clear flag, rest also unset");
 184   feclearexcept (exception);
 185   test_exceptions (str, NO_EXC, ignore_inexact);
 186
 187   strcpy (str, test_name);
 188   strcat (str, ": set flag, with rest set");
 189   feraiseexcept (FE_ALL_EXCEPT ^ exception);
 190   feraiseexcept (exception);
 191   test_exceptions (str, ALL_EXC, 0);
 192
 193   strcpy (str, test_name);
 194   strcat (str, ": clear flag, leave rest set");
 195   feclearexcept (exception);
 196   test_exceptions (str, ALL_EXC ^ fe_exc, 0);
 197 }
 198
 199 static void
 200 fe_tests (void)
 201 {
 202   /* clear all exceptions and test if all are cleared */
 203   feclearexcept (FE_ALL_EXCEPT);
 204   test_exceptions ("feclearexcept (FE_ALL_EXCEPT) clears all exceptions",
 205                    NO_EXC, 0);
 206
 207   /* raise all exceptions and test if all are raised */
 208   feraiseexcept (FE_ALL_EXCEPT);
 209   test_exceptions ("feraiseexcept (FE_ALL_EXCEPT) raises all exceptions",
 210                    ALL_EXC, 0);
 211   feclearexcept (FE_ALL_EXCEPT);
 212
 213 #ifdef FE_DIVBYZERO
 214   set_single_exc ("Set/Clear FE_DIVBYZERO", DIVBYZERO_EXC, FE_DIVBYZERO);
 215 #endif
 216 #ifdef FE_INVALID
 217   set_single_exc ("Set/Clear FE_INVALID", INVALID_EXC, FE_INVALID);
 218 #endif
 219 #ifdef FE_INEXACT
 220   set_single_exc ("Set/Clear FE_INEXACT", INEXACT_EXC, FE_INEXACT);
 221 #endif
 222 #ifdef FE_UNDERFLOW
 223   set_single_exc ("Set/Clear FE_UNDERFLOW", UNDERFLOW_EXC, FE_UNDERFLOW);
 224 #endif
 225 #ifdef FE_OVERFLOW
 226   set_single_exc ("Set/Clear FE_OVERFLOW", OVERFLOW_EXC, FE_OVERFLOW);
 227 #endif
 228 }
 229
 230 /* Test that program aborts with no masked interrupts */
 231 static void
 232 feenv_nomask_test (const char *flag_name, int fe_exc)
 233 {
 234 #if defined FE_NOMASK_ENV
 235   int status;
 236   pid_t pid;
 237   fenv_t saved;
 238
 239   fegetenv (&saved);
 240   errno = 0;
 241   fesetenv (FE_NOMASK_ENV);
 242   status = errno;
 243   fesetenv (&saved);
 244   if (status == ENOSYS)
 245     {
 246       printf ("Test: not testing FE_NOMASK_ENV, it isn't implemented.\n");
 247       return;
 248     }
 249
 250   printf ("Test: after fesetenv (FE_NOMASK_ENV) processes will abort\n");
 251   printf ("      when feraiseexcept (%s) is called.\n", flag_name);
 252   pid = fork ();
 253   if (pid == 0)
 254     {
 255 #ifdef RLIMIT_CORE
 256       /* Try to avoid dumping core.  */
 257       struct rlimit core_limit;
 258       core_limit.rlim_cur = 0;
 259       core_limit.rlim_max = 0;
 260       setrlimit (RLIMIT_CORE, &core_limit);
 261 #endif
 262
 263       fesetenv (FE_NOMASK_ENV);
 264       feraiseexcept (fe_exc);
 265       exit (2);
 266     }
 267   else if (pid < 0)
 268     {
 269       if (errno != ENOSYS)
 270         {
 271           printf ("  Fail: Could not fork.\n");
 272           ++count_errors;
 273         }
 274       else
 275         printf ("  `fork' not implemented, test ignored.\n");
 276     }
 277   else {
 278     if (waitpid (pid, &status, 0) != pid)
 279       {
 280         printf ("  Fail: waitpid call failed.\n");
 281         ++count_errors;
 282       }
 283     else if (WIFSIGNALED (status) && WTERMSIG (status) == SIGFPE)
 284       printf ("  Pass: Process received SIGFPE.\n");
 285     else
 286       {
 287         printf ("  Fail: Process didn't receive signal and exited with status %d.\n",
 288                 status);
 289         ++count_errors;
 290       }
 291   }
 292 #endif
 293 }
 294
 295 /* Test that program doesn't abort with default environment */
 296 static void
 297 feenv_mask_test (const char *flag_name, int fe_exc)
 298 {
 299   int status;
 300   pid_t pid;
 301
 302   printf ("Test: after fesetenv (FE_DFL_ENV) processes will not abort\n");
 303   printf ("      when feraiseexcept (%s) is called.\n", flag_name);
 304   pid = fork ();
 305   if (pid == 0)
 306     {
 307 #ifdef RLIMIT_CORE
 308       /* Try to avoid dumping core.  */
 309       struct rlimit core_limit;
 310       core_limit.rlim_cur = 0;
 311       core_limit.rlim_max = 0;
 312       setrlimit (RLIMIT_CORE, &core_limit);
 313 #endif
 314
 315       fesetenv (FE_DFL_ENV);
 316       feraiseexcept (fe_exc);
 317       exit (2);
 318     }
 319   else if (pid < 0)
 320     {
 321       if (errno != ENOSYS)
 322         {
 323           printf ("  Fail: Could not fork.\n");
 324           ++count_errors;
 325         }
 326       else
 327         printf ("  `fork' not implemented, test ignored.\n");
 328     }
 329   else {
 330     if (waitpid (pid, &status, 0) != pid)
 331       {
 332         printf ("  Fail: waitpid call failed.\n");
 333         ++count_errors;
 334       }
 335     else if (WIFEXITED (status) && WEXITSTATUS (status) == 2)
 336       printf ("  Pass: Process exited normally.\n");
 337     else
 338       {
 339         printf ("  Fail: Process exited abnormally with status %d.\n",
 340                 status);
 341         ++count_errors;
 342       }
 343   }
 344 }
 345
 346
 347
 348 static void
 349 feenv_tests (void)
 350 {
 351
 352 #ifdef FE_DIVBYZERO
 353   feenv_nomask_test ("FE_DIVBYZERO", FE_DIVBYZERO);
 354   feenv_mask_test ("FE_DIVBYZERO", FE_DIVBYZERO);
 355 #endif
 356 #ifdef FE_INVALID
 357   feenv_nomask_test ("FE_INVALID", FE_INVALID);
 358   feenv_mask_test ("FE_INVALID", FE_INVALID);
 359 #endif
 360 #ifdef FE_INEXACT
 361   feenv_nomask_test ("FE_INEXACT", FE_INEXACT);
 362   feenv_mask_test ("FE_INEXACT", FE_INEXACT);
 363 #endif
 364 #ifdef FE_UNDERFLOW
 365   feenv_nomask_test ("FE_UNDERFLOW", FE_UNDERFLOW);
 366   feenv_mask_test ("FE_UNDERFLOW", FE_UNDERFLOW);
 367 #endif
 368 #ifdef FE_OVERFLOW
 369   feenv_nomask_test ("FE_OVERFLOW", FE_OVERFLOW);
 370   feenv_mask_test ("FE_OVERFLOW", FE_OVERFLOW);
 371 #endif
 372   fesetenv (FE_DFL_ENV);
 373 }
 374
 375
 376 /* IEC 559 and ISO C 9X define a default startup environment */
 377 static void
 378 initial_tests (void)
 379 {
 380   test_exceptions ("Initially all exceptions should be cleared",
 381                    NO_EXC, 0);
 382   test_rounding ("Rounding direction should be initalized to nearest",
 383                  FE_TONEAREST);
 384 }
 385
 386 int
 387 main (void)
 388 {
 389   initial_tests ();
 390   fe_tests ();
 391   feenv_tests ();
 392
 393   if (count_errors)
 394     {
 395       printf ("\n%d errors occured.\n", count_errors);
 396       exit (1);
 397     }
 398   printf ("\n All tests passed successfully.\n");
 399   exit (0);
 400 }