Include/pyport.h

   1 #ifndef Py_PYPORT_H
   2 #define Py_PYPORT_H
   3
   4 #include "pyconfig.h" /* include for defines */
   5
   6 /**************************************************************************
   7 Symbols and macros to supply platform-independent interfaces to basic
   8 C language & library operations whose spellings vary across platforms.
   9
  10 Please try to make documentation here as clear as possible:  by definition,
  11 the stuff here is trying to illuminate C's darkest corners.
  12
  13 Config #defines referenced here:
  14
  15 SIGNED_RIGHT_SHIFT_ZERO_FILLS
  16 Meaning:  To be defined iff i>>j does not extend the sign bit when i is a
  17           signed integral type and i < 0.
  18 Used in:  Py_ARITHMETIC_RIGHT_SHIFT
  19
  20 Py_DEBUG
  21 Meaning:  Extra checks compiled in for debug mode.
  22 Used in:  Py_SAFE_DOWNCAST
  23
  24 HAVE_UINTPTR_T
  25 Meaning:  The C9X type uintptr_t is supported by the compiler
  26 Used in:  Py_uintptr_t
  27
  28 HAVE_LONG_LONG
  29 Meaning:  The compiler supports the C type "long long"
  30 Used in:  PY_LONG_LONG
  31
  32 **************************************************************************/
  33
  34
  35 /* For backward compatibility only. Obsolete, do not use. */
  36 #ifdef HAVE_PROTOTYPES
  37 #define Py_PROTO(x) x
  38 #else
  39 #define Py_PROTO(x) ()
  40 #endif
  41 #ifndef Py_FPROTO
  42 #define Py_FPROTO(x) Py_PROTO(x)
  43 #endif
  44
  45 /* typedefs for some C9X-defined synonyms for integral types.
  46  *
  47  * The names in Python are exactly the same as the C9X names, except with a
  48  * Py_ prefix.  Until C9X is universally implemented, this is the only way
  49  * to ensure that Python gets reliable names that don't conflict with names
  50  * in non-Python code that are playing their own tricks to define the C9X
  51  * names.
  52  *
  53  * NOTE: don't go nuts here!  Python has no use for *most* of the C9X
  54  * integral synonyms.  Only define the ones we actually need.
  55  */
  56
  57 #ifdef HAVE_LONG_LONG
  58 #ifndef PY_LONG_LONG
  59 #define PY_LONG_LONG long long
  60 #endif
  61 #endif /* HAVE_LONG_LONG */
  62
  63 /* uintptr_t is the C9X name for an unsigned integral type such that a
  64  * legitimate void* can be cast to uintptr_t and then back to void* again
  65  * without loss of information.  Similarly for intptr_t, wrt a signed
  66  * integral type.
  67  */
  68 #ifdef HAVE_UINTPTR_T
  69 typedef uintptr_t       Py_uintptr_t;
  70 typedef intptr_t        Py_intptr_t;
  71
  72 #elif SIZEOF_VOID_P <= SIZEOF_INT
  73 typedef unsigned int    Py_uintptr_t;
  74 typedef int             Py_intptr_t;
  75
  76 #elif SIZEOF_VOID_P <= SIZEOF_LONG
  77 typedef unsigned long   Py_uintptr_t;
  78 typedef long            Py_intptr_t;
  79
  80 #elif defined(HAVE_LONG_LONG) && (SIZEOF_VOID_P <= SIZEOF_LONG_LONG)
  81 typedef unsigned PY_LONG_LONG   Py_uintptr_t;
  82 typedef PY_LONG_LONG            Py_intptr_t;
  83
  84 #else
  85 #   error "Python needs a typedef for Py_uintptr_t in pyport.h."
  86 #endif /* HAVE_UINTPTR_T */
  87
  88 /* Py_ssize_t is a signed integral type such that sizeof(Py_ssize_t) ==
  89  * sizeof(size_t).  C99 doesn't define such a thing directly (size_t is an
  90  * unsigned integral type).  See PEP 353 for details.
  91  */
  92 #ifdef HAVE_SSIZE_T
  93 typedef ssize_t         Py_ssize_t;
  94 #elif SIZEOF_VOID_P == SIZEOF_SIZE_T
  95 typedef Py_intptr_t     Py_ssize_t;
  96 #else
  97 #   error "Python needs a typedef for Py_ssize_t in pyport.h."
  98 #endif
  99
 100 /* Largest positive value of type Py_ssize_t. */
 101 #define PY_SSIZE_T_MAX ((Py_ssize_t)(((size_t)-1)>>1))
 102 /* Smallest negative value of type Py_ssize_t. */
 103 #define PY_SSIZE_T_MIN (-PY_SSIZE_T_MAX-1)
 104
 105 /* PY_FORMAT_SIZE_T is a platform-specific modifier for use in a printf
 106  * format to convert an argument with the width of a size_t or Py_ssize_t.
 107  * C99 introduced "z" for this purpose, but not all platforms support that;
 108  * e.g., MS compilers use "I" instead.
 109  *
 110  * These "high level" Python format functions interpret "z" correctly on
 111  * all platforms (Python interprets the format string itself, and does whatever
 112  * the platform C requires to convert a size_t/Py_ssize_t argument):
 113  *
 114  *     PyString_FromFormat
 115  *     PyErr_Format
 116  *     PyString_FromFormatV
 117  *
 118  * Lower-level uses require that you interpolate the correct format modifier
 119  * yourself (e.g., calling printf, fprintf, sprintf, PyOS_snprintf); for
 120  * example,
 121  *
 122  *     Py_ssize_t index;
 123  *     fprintf(stderr, "index %" PY_FORMAT_SIZE_T "d sucks\n", index);
 124  *
 125  * That will expand to %ld, or %Id, or to something else correct for a
 126  * Py_ssize_t on the platform.
 127  */
 128 #ifndef PY_FORMAT_SIZE_T
 129 #   if SIZEOF_SIZE_T == SIZEOF_INT
 130 #       define PY_FORMAT_SIZE_T ""
 131 #   elif SIZEOF_SIZE_T == SIZEOF_LONG
 132 #       define PY_FORMAT_SIZE_T "l"
 133 #   elif defined(MS_WINDOWS)
 134 #       define PY_FORMAT_SIZE_T "I"
 135 #   else
 136 #       error "This platform's pyconfig.h needs to define PY_FORMAT_SIZE_T"
 137 #   endif
 138 #endif
 139
 140 #include <stdlib.h>
 141
 142 #include <math.h> /* Moved here from the math section, before extern "C" */
 143
 144 /********************************************
 145  * WRAPPER FOR <time.h> and/or <sys/time.h> *
 146  ********************************************/
 147
 148 #ifdef TIME_WITH_SYS_TIME
 149 #include <sys/time.h>
 150 #include <time.h>
 151 #else /* !TIME_WITH_SYS_TIME */
 152 #ifdef HAVE_SYS_TIME_H
 153 #include <sys/time.h>
 154 #else /* !HAVE_SYS_TIME_H */
 155 #include <time.h>
 156 #endif /* !HAVE_SYS_TIME_H */
 157 #endif /* !TIME_WITH_SYS_TIME */
 158
 159
 160 /******************************
 161  * WRAPPER FOR <sys/select.h> *
 162  ******************************/
 163
 164 /* NB caller must include <sys/types.h> */
 165
 166 #ifdef HAVE_SYS_SELECT_H
 167
 168 #include <sys/select.h>
 169
 170 #endif /* !HAVE_SYS_SELECT_H */
 171
 172 /*******************************
 173  * stat() and fstat() fiddling *
 174  *******************************/
 175
 176 /* We expect that stat and fstat exist on most systems.
 177  *  It's confirmed on Unix, Mac and Windows.
 178  *  If you don't have them, add
 179  *      #define DONT_HAVE_STAT
 180  * and/or
 181  *      #define DONT_HAVE_FSTAT
 182  * to your pyconfig.h. Python code beyond this should check HAVE_STAT and
 183  * HAVE_FSTAT instead.
 184  * Also
 185  *      #define DONT_HAVE_SYS_STAT_H
 186  * if <sys/stat.h> doesn't exist on your platform, and
 187  *      #define HAVE_STAT_H
 188  * if <stat.h> does (don't look at me -- ths mess is inherited).
 189  */
 190 #ifndef DONT_HAVE_STAT
 191 #define HAVE_STAT
 192 #endif
 193
 194 #ifndef DONT_HAVE_FSTAT
 195 #define HAVE_FSTAT
 196 #endif
 197
 198 #ifdef RISCOS
 199 #include <sys/types.h>
 200 #include "unixstuff.h"
 201 #endif
 202
 203 #ifndef DONT_HAVE_SYS_STAT_H
 204 #if defined(PYOS_OS2) && defined(PYCC_GCC)
 205 #include <sys/types.h>
 206 #endif
 207 #include <sys/stat.h>
 208 #elif defined(HAVE_STAT_H)
 209 #include <stat.h>
 210 #endif
 211
 212 #if defined(PYCC_VACPP)
 213 /* VisualAge C/C++ Failed to Define MountType Field in sys/stat.h */
 214 #define S_IFMT (S_IFDIR|S_IFCHR|S_IFREG)
 215 #endif
 216
 217 #ifndef S_ISREG
 218 #define S_ISREG(x) (((x) & S_IFMT) == S_IFREG)
 219 #endif
 220
 221 #ifndef S_ISDIR
 222 #define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
 223 #endif
 224
 225
 226 #ifdef __cplusplus
 227 /* Move this down here since some C++ #include's don't like to be included
 228    inside an extern "C" */
 229 extern "C" {
 230 #endif
 231
 232
 233 /* Py_ARITHMETIC_RIGHT_SHIFT
 234  * C doesn't define whether a right-shift of a signed integer sign-extends
 235  * or zero-fills.  Here a macro to force sign extension:
 236  * Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J)
 237  *    Return I >> J, forcing sign extension.
 238  * Requirements:
 239  *    I is of basic signed type TYPE (char, short, int, long, or long long).
 240  *    TYPE is one of char, short, int, long, or long long, although long long
 241  *    must not be used except on platforms that support it.
 242  *    J is an integer >= 0 and strictly less than the number of bits in TYPE
 243  *    (because C doesn't define what happens for J outside that range either).
 244  * Caution:
 245  *    I may be evaluated more than once.
 246  */
 247 #ifdef SIGNED_RIGHT_SHIFT_ZERO_FILLS
 248 #define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) \
 249         ((I) < 0 ? ~((~(unsigned TYPE)(I)) >> (J)) : (I) >> (J))
 250 #else
 251 #define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) ((I) >> (J))
 252 #endif
 253
 254 /* Py_FORCE_EXPANSION(X)
 255  * "Simply" returns its argument.  However, macro expansions within the
 256  * argument are evaluated.  This unfortunate trickery is needed to get
 257  * token-pasting to work as desired in some cases.
 258  */
 259 #define Py_FORCE_EXPANSION(X) X
 260
 261 /* Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW)
 262  * Cast VALUE to type NARROW from type WIDE.  In Py_DEBUG mode, this
 263  * assert-fails if any information is lost.
 264  * Caution:
 265  *    VALUE may be evaluated more than once.
 266  */
 267 #ifdef Py_DEBUG
 268 #define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) \
 269         (assert((WIDE)(NARROW)(VALUE) == (VALUE)), (NARROW)(VALUE))
 270 #else
 271 #define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) (NARROW)(VALUE)
 272 #endif
 273
 274 /* Py_IS_NAN(X)
 275  * Return 1 if float or double arg is a NaN, else 0.
 276  * Caution:
 277  *     X is evaluated more than once.
 278  *     This may not work on all platforms.  Each platform has *some*
 279  *     way to spell this, though -- override in pyconfig.h if you have
 280  *     a platform where it doesn't work.
 281  */
 282 #ifndef Py_IS_NAN
 283 #define Py_IS_NAN(X) ((X) != (X))
 284 #endif
 285
 286 /* Py_IS_INFINITY(X)
 287  * Return 1 if float or double arg is an infinity, else 0.
 288  * Caution:
 289  *    X is evaluated more than once.
 290  *    This implementation may set the underflow flag if |X| is very small;
 291  *    it really can't be implemented correctly (& easily) before C99.
 292  *    Override in pyconfig.h if you have a better spelling on your platform.
 293  */
 294 #ifndef Py_IS_INFINITY
 295 #define Py_IS_INFINITY(X) ((X) && (X)*0.5 == (X))
 296 #endif
 297
 298 /* HUGE_VAL is supposed to expand to a positive double infinity.  Python
 299  * uses Py_HUGE_VAL instead because some platforms are broken in this
 300  * respect.  We used to embed code in pyport.h to try to worm around that,
 301  * but different platforms are broken in conflicting ways.  If you're on
 302  * a platform where HUGE_VAL is defined incorrectly, fiddle your Python
 303  * config to #define Py_HUGE_VAL to something that works on your platform.
 304  */
 305 #ifndef Py_HUGE_VAL
 306 #define Py_HUGE_VAL HUGE_VAL
 307 #endif
 308
 309 /* Py_OVERFLOWED(X)
 310  * Return 1 iff a libm function overflowed.  Set errno to 0 before calling
 311  * a libm function, and invoke this macro after, passing the function
 312  * result.
 313  * Caution:
 314  *    This isn't reliable.  C99 no longer requires libm to set errno under
 315  *        any exceptional condition, but does require +- HUGE_VAL return
 316  *        values on overflow.  A 754 box *probably* maps HUGE_VAL to a
 317  *        double infinity, and we're cool if that's so, unless the input
 318  *        was an infinity and an infinity is the expected result.  A C89
 319  *        system sets errno to ERANGE, so we check for that too.  We're
 320  *        out of luck if a C99 754 box doesn't map HUGE_VAL to +Inf, or
 321  *        if the returned result is a NaN, or if a C89 box returns HUGE_VAL
 322  *        in non-overflow cases.
 323  *    X is evaluated more than once.
 324  * Some platforms have better way to spell this, so expect some #ifdef'ery.
 325  *
 326  * OpenBSD uses 'isinf()' because a compiler bug on that platform causes
 327  * the longer macro version to be mis-compiled. This isn't optimal, and
 328  * should be removed once a newer compiler is available on that platform.
 329  * The system that had the failure was running OpenBSD 3.2 on Intel, with
 330  * gcc 2.95.3.
 331  *
 332  * According to Tim's checkin, the FreeBSD systems use isinf() to work
 333  * around a FPE bug on that platform.
 334  */
 335 #if defined(__FreeBSD__) || defined(__OpenBSD__)
 336 #define Py_OVERFLOWED(X) isinf(X)
 337 #else
 338 #define Py_OVERFLOWED(X) ((X) != 0.0 && (errno == ERANGE ||    \
 339                                          (X) == Py_HUGE_VAL || \
 340                                          (X) == -Py_HUGE_VAL))
 341 #endif
 342
 343 /* Py_SET_ERRNO_ON_MATH_ERROR(x)
 344  * If a libm function did not set errno, but it looks like the result
 345  * overflowed or not-a-number, set errno to ERANGE or EDOM.  Set errno
 346  * to 0 before calling a libm function, and invoke this macro after,
 347  * passing the function result.
 348  * Caution:
 349  *    This isn't reliable.  See Py_OVERFLOWED comments.
 350  *    X is evaluated more than once.
 351  */
 352 #if defined(__FreeBSD__) || defined(__OpenBSD__) || (defined(__hpux) && defined(__ia64))
 353 #define _Py_SET_EDOM_FOR_NAN(X) if (isnan(X)) errno = EDOM;
 354 #else
 355 #define _Py_SET_EDOM_FOR_NAN(X) ;
 356 #endif
 357 #define Py_SET_ERRNO_ON_MATH_ERROR(X) \
 358         do { \
 359                 if (errno == 0) { \
 360                         if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL) \
 361                                 errno = ERANGE; \
 362                         else _Py_SET_EDOM_FOR_NAN(X) \
 363                 } \
 364         } while(0)
 365
 366 /* Py_SET_ERANGE_ON_OVERFLOW(x)
 367  * An alias of Py_SET_ERRNO_ON_MATH_ERROR for backward-compatibility.
 368  */
 369 #define Py_SET_ERANGE_IF_OVERFLOW(X) Py_SET_ERRNO_ON_MATH_ERROR(X)
 370
 371 /* Py_ADJUST_ERANGE1(x)
 372  * Py_ADJUST_ERANGE2(x, y)
 373  * Set errno to 0 before calling a libm function, and invoke one of these
 374  * macros after, passing the function result(s) (Py_ADJUST_ERANGE2 is useful
 375  * for functions returning complex results).  This makes two kinds of
 376  * adjustments to errno:  (A) If it looks like the platform libm set
 377  * errno=ERANGE due to underflow, clear errno. (B) If it looks like the
 378  * platform libm overflowed but didn't set errno, force errno to ERANGE.  In
 379  * effect, we're trying to force a useful implementation of C89 errno
 380  * behavior.
 381  * Caution:
 382  *    This isn't reliable.  See Py_OVERFLOWED comments.
 383  *    X and Y may be evaluated more than once.
 384  */
 385 #define Py_ADJUST_ERANGE1(X)                                            \
 386         do {                                                            \
 387                 if (errno == 0) {                                       \
 388                         if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL)  \
 389                                 errno = ERANGE;                         \
 390                 }                                                       \
 391                 else if (errno == ERANGE && (X) == 0.0)                 \
 392                         errno = 0;                                      \
 393         } while(0)
 394
 395 #define Py_ADJUST_ERANGE2(X, Y)                                         \
 396         do {                                                            \
 397                 if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL ||        \
 398                     (Y) == Py_HUGE_VAL || (Y) == -Py_HUGE_VAL) {        \
 399                                 if (errno == 0)                         \
 400                                         errno = ERANGE;                 \
 401                 }                                                       \
 402                 else if (errno == ERANGE)                               \
 403                         errno = 0;                                      \
 404         } while(0)
 405
 406 /* Py_DEPRECATED(version)
 407  * Declare a variable, type, or function deprecated.
 408  * Usage:
 409  *    extern int old_var Py_DEPRECATED(2.3);
 410  *    typedef int T1 Py_DEPRECATED(2.4);
 411  *    extern int x() Py_DEPRECATED(2.5);
 412  */
 413 #if defined(__GNUC__) && ((__GNUC__ >= 4) || \
 414                           (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1))
 415 #define Py_DEPRECATED(VERSION_UNUSED) __attribute__((__deprecated__))
 416 #else
 417 #define Py_DEPRECATED(VERSION_UNUSED)
 418 #endif
 419
 420 /**************************************************************************
 421 Prototypes that are missing from the standard include files on some systems
 422 (and possibly only some versions of such systems.)
 423
 424 Please be conservative with adding new ones, document them and enclose them
 425 in platform-specific #ifdefs.
 426 **************************************************************************/
 427
 428 #ifdef SOLARIS
 429 /* Unchecked */
 430 extern int gethostname(char *, int);
 431 #endif
 432
 433 #ifdef __BEOS__
 434 /* Unchecked */
 435 /* It's in the libs, but not the headers... - [cjh] */
 436 int shutdown( int, int );
 437 #endif
 438
 439 #ifdef HAVE__GETPTY
 440 #include <sys/types.h>          /* we need to import mode_t */
 441 extern char * _getpty(int *, int, mode_t, int);
 442 #endif
 443
 444 #if defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY)
 445 #if !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H)
 446 /* BSDI does not supply a prototype for the 'openpty' and 'forkpty'
 447    functions, even though they are included in libutil. */
 448 #include <termios.h>
 449 extern int openpty(int *, int *, char *, struct termios *, struct winsize *);
 450 extern int forkpty(int *, char *, struct termios *, struct winsize *);
 451 #endif /* !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H) */
 452 #endif /* defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY) */
 453
 454
 455 /* These are pulled from various places. It isn't obvious on what platforms
 456    they are necessary, nor what the exact prototype should look like (which
 457    is likely to vary between platforms!) If you find you need one of these
 458    declarations, please move them to a platform-specific block and include
 459    proper prototypes. */
 460 #if 0
 461
 462 /* From Modules/resource.c */
 463 extern int getrusage();
 464 extern int getpagesize();
 465
 466 /* From Python/sysmodule.c and Modules/posixmodule.c */
 467 extern int fclose(FILE *);
 468
 469 /* From Modules/posixmodule.c */
 470 extern int fdatasync(int);
 471 #endif /* 0 */
 472
 473
 474 /************************
 475  * WRAPPER FOR <math.h> *
 476  ************************/
 477
 478 #ifndef HAVE_HYPOT
 479 extern double hypot(double, double);
 480 #endif
 481
 482
 483 /* On 4.4BSD-descendants, ctype functions serves the whole range of
 484  * wchar_t character set rather than single byte code points only.
 485  * This characteristic can break some operations of string object
 486  * including str.upper() and str.split() on UTF-8 locales.  This
 487  * workaround was provided by Tim Robbins of FreeBSD project.
 488  */
 489
 490 #ifdef __FreeBSD__
 491 #include <osreldate.h>
 492 #if __FreeBSD_version > 500039
 493 #include <ctype.h>
 494 #include <wctype.h>
 495 #undef isalnum
 496 #define isalnum(c) iswalnum(btowc(c))
 497 #undef isalpha
 498 #define isalpha(c) iswalpha(btowc(c))
 499 #undef islower
 500 #define islower(c) iswlower(btowc(c))
 501 #undef isspace
 502 #define isspace(c) iswspace(btowc(c))
 503 #undef isupper
 504 #define isupper(c) iswupper(btowc(c))
 505 #undef tolower
 506 #define tolower(c) towlower(btowc(c))
 507 #undef toupper
 508 #define toupper(c) towupper(btowc(c))
 509 #endif
 510 #endif
 511
 512
 513 /* Declarations for symbol visibility.
 514
 515   PyAPI_FUNC(type): Declares a public Python API function and return type
 516   PyAPI_DATA(type): Declares public Python data and its type
 517   PyMODINIT_FUNC:   A Python module init function.  If these functions are
 518                     inside the Python core, they are private to the core.
 519                     If in an extension module, it may be declared with
 520                     external linkage depending on the platform.
 521
 522   As a number of platforms support/require "__declspec(dllimport/dllexport)",
 523   we support a HAVE_DECLSPEC_DLL macro to save duplication.
 524 */
 525
 526 /*
 527   All windows ports, except cygwin, are handled in PC/pyconfig.h.
 528
 529   BeOS and cygwin are the only other autoconf platform requiring special
 530   linkage handling and both of these use __declspec().
 531 */
 532 #if defined(__CYGWIN__) || defined(__BEOS__)
 533 #       define HAVE_DECLSPEC_DLL
 534 #endif
 535
 536 /* only get special linkage if built as shared or platform is Cygwin */
 537 #if defined(Py_ENABLE_SHARED) || defined(__CYGWIN__)
 538 #       if defined(HAVE_DECLSPEC_DLL)
 539 #               ifdef Py_BUILD_CORE
 540 #                       define PyAPI_FUNC(RTYPE) __declspec(dllexport) RTYPE
 541 #                       define PyAPI_DATA(RTYPE) extern __declspec(dllexport) RTYPE
 542                         /* module init functions inside the core need no external linkage */
 543                         /* except for Cygwin to handle embedding (FIXME: BeOS too?) */
 544 #                       if defined(__CYGWIN__)
 545 #                               define PyMODINIT_FUNC __declspec(dllexport) void
 546 #                       else /* __CYGWIN__ */
 547 #                               define PyMODINIT_FUNC void
 548 #                       endif /* __CYGWIN__ */
 549 #               else /* Py_BUILD_CORE */
 550                         /* Building an extension module, or an embedded situation */
 551                         /* public Python functions and data are imported */
 552                         /* Under Cygwin, auto-import functions to prevent compilation */
 553                         /* failures similar to http://python.org/doc/FAQ.html#3.24 */
 554 #                       if !defined(__CYGWIN__)
 555 #                               define PyAPI_FUNC(RTYPE) __declspec(dllimport) RTYPE
 556 #                       endif /* !__CYGWIN__ */
 557 #                       define PyAPI_DATA(RTYPE) extern __declspec(dllimport) RTYPE
 558                         /* module init functions outside the core must be exported */
 559 #                       if defined(__cplusplus)
 560 #                               define PyMODINIT_FUNC extern "C" __declspec(dllexport) void
 561 #                       else /* __cplusplus */
 562 #                               define PyMODINIT_FUNC __declspec(dllexport) void
 563 #                       endif /* __cplusplus */
 564 #               endif /* Py_BUILD_CORE */
 565 #       endif /* HAVE_DECLSPEC */
 566 #endif /* Py_ENABLE_SHARED */
 567
 568 /* If no external linkage macros defined by now, create defaults */
 569 #ifndef PyAPI_FUNC
 570 #       define PyAPI_FUNC(RTYPE) RTYPE
 571 #endif
 572 #ifndef PyAPI_DATA
 573 #       define PyAPI_DATA(RTYPE) extern RTYPE
 574 #endif
 575 #ifndef PyMODINIT_FUNC
 576 #       if defined(__cplusplus)
 577 #               define PyMODINIT_FUNC extern "C" void
 578 #       else /* __cplusplus */
 579 #               define PyMODINIT_FUNC void
 580 #       endif /* __cplusplus */
 581 #endif
 582
 583 /* Deprecated DL_IMPORT and DL_EXPORT macros */
 584 #if defined(Py_ENABLE_SHARED) && defined (HAVE_DECLSPEC_DLL)
 585 #       if defined(Py_BUILD_CORE)
 586 #               define DL_IMPORT(RTYPE) __declspec(dllexport) RTYPE
 587 #               define DL_EXPORT(RTYPE) __declspec(dllexport) RTYPE
 588 #       else
 589 #               define DL_IMPORT(RTYPE) __declspec(dllimport) RTYPE
 590 #               define DL_EXPORT(RTYPE) __declspec(dllexport) RTYPE
 591 #       endif
 592 #endif
 593 #ifndef DL_EXPORT
 594 #       define DL_EXPORT(RTYPE) RTYPE
 595 #endif
 596 #ifndef DL_IMPORT
 597 #       define DL_IMPORT(RTYPE) RTYPE
 598 #endif
 599 /* End of deprecated DL_* macros */
 600
 601 /* If the fd manipulation macros aren't defined,
 602    here is a set that should do the job */
 603
 604 #if 0 /* disabled and probably obsolete */
 605
 606 #ifndef FD_SETSIZE
 607 #define FD_SETSIZE      256
 608 #endif
 609
 610 #ifndef FD_SET
 611
 612 typedef long fd_mask;
 613
 614 #define NFDBITS (sizeof(fd_mask) * NBBY)        /* bits per mask */
 615 #ifndef howmany
 616 #define howmany(x, y)   (((x)+((y)-1))/(y))
 617 #endif /* howmany */
 618
 619 typedef struct fd_set {
 620         fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
 621 } fd_set;
 622
 623 #define FD_SET(n, p)    ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
 624 #define FD_CLR(n, p)    ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
 625 #define FD_ISSET(n, p)  ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
 626 #define FD_ZERO(p)      memset((char *)(p), '\0', sizeof(*(p)))
 627
 628 #endif /* FD_SET */
 629
 630 #endif /* fd manipulation macros */
 631
 632
 633 /* limits.h constants that may be missing */
 634
 635 #ifndef INT_MAX
 636 #define INT_MAX 2147483647
 637 #endif
 638
 639 #ifndef LONG_MAX
 640 #if SIZEOF_LONG == 4
 641 #define LONG_MAX 0X7FFFFFFFL
 642 #elif SIZEOF_LONG == 8
 643 #define LONG_MAX 0X7FFFFFFFFFFFFFFFL
 644 #else
 645 #error "could not set LONG_MAX in pyport.h"
 646 #endif
 647 #endif
 648
 649 #ifndef LONG_MIN
 650 #define LONG_MIN (-LONG_MAX-1)
 651 #endif
 652
 653 #ifndef LONG_BIT
 654 #define LONG_BIT (8 * SIZEOF_LONG)
 655 #endif
 656
 657 #if LONG_BIT != 8 * SIZEOF_LONG
 658 /* 04-Oct-2000 LONG_BIT is apparently (mis)defined as 64 on some recent
 659  * 32-bit platforms using gcc.  We try to catch that here at compile-time
 660  * rather than waiting for integer multiplication to trigger bogus
 661  * overflows.
 662  */
 663 #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
 664 #endif
 665
 666 #ifdef __cplusplus
 667 }
 668 #endif
 669
 670 /*
 671  * Hide GCC attributes from compilers that don't support them.
 672  */
 673 #if (!defined(__GNUC__) || __GNUC__ < 2 || \
 674      (__GNUC__ == 2 && __GNUC_MINOR__ < 7) ) && \
 675     !defined(RISCOS)
 676 #define Py_GCC_ATTRIBUTE(x)
 677 #else
 678 #define Py_GCC_ATTRIBUTE(x) __attribute__(x)
 679 #endif
 680
 681 /* Eliminate end-of-loop code not reached warnings from SunPro C
 682  * when using do{...}while(0) macros
 683  */
 684 #ifdef __SUNPRO_C
 685 #pragma error_messages (off,E_END_OF_LOOP_CODE_NOT_REACHED)
 686 #endif
 687
 688 #endif /* Py_PYPORT_H */