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- #ifndef Py_PYPORT_H
- #define Py_PYPORT_H
-
- #include "pyconfig.h" /* include for defines */
-
- /**************************************************************************
- Symbols and macros to supply platform-independent interfaces to basic
- C language & library operations whose spellings vary across platforms.
-
- Please try to make documentation here as clear as possible: by definition,
- the stuff here is trying to illuminate C's darkest corners.
-
- Config #defines referenced here:
-
- SIGNED_RIGHT_SHIFT_ZERO_FILLS
- Meaning: To be defined iff i>>j does not extend the sign bit when i is a
- signed integral type and i < 0.
- Used in: Py_ARITHMETIC_RIGHT_SHIFT
-
- Py_DEBUG
- Meaning: Extra checks compiled in for debug mode.
- Used in: Py_SAFE_DOWNCAST
-
- HAVE_UINTPTR_T
- Meaning: The C9X type uintptr_t is supported by the compiler
- Used in: Py_uintptr_t
-
- HAVE_LONG_LONG
- Meaning: The compiler supports the C type "long long"
- Used in: LONG_LONG
-
- **************************************************************************/
-
-
- /* For backward compatibility only. Obsolete, do not use. */
- #define ANY void
- #ifdef HAVE_PROTOTYPES
- #define Py_PROTO(x) x
- #else
- #define Py_PROTO(x) ()
- #endif
- #ifndef Py_FPROTO
- #define Py_FPROTO(x) Py_PROTO(x)
- #endif
-
- /* typedefs for some C9X-defined synonyms for integral types.
- *
- * The names in Python are exactly the same as the C9X names, except with a
- * Py_ prefix. Until C9X is universally implemented, this is the only way
- * to ensure that Python gets reliable names that don't conflict with names
- * in non-Python code that are playing their own tricks to define the C9X
- * names.
- *
- * NOTE: don't go nuts here! Python has no use for *most* of the C9X
- * integral synonyms. Only define the ones we actually need.
- */
-
- #ifdef HAVE_LONG_LONG
- #ifndef LONG_LONG
- #define LONG_LONG long long
- #endif
- #endif /* HAVE_LONG_LONG */
-
- /* uintptr_t is the C9X name for an unsigned integral type such that a
- * legitimate void* can be cast to uintptr_t and then back to void* again
- * without loss of information. Similarly for intptr_t, wrt a signed
- * integral type.
- */
- #ifdef HAVE_UINTPTR_T
- typedef uintptr_t Py_uintptr_t;
- typedef intptr_t Py_intptr_t;
-
- #elif SIZEOF_VOID_P <= SIZEOF_INT
- typedef unsigned int Py_uintptr_t;
- typedef int Py_intptr_t;
-
- #elif SIZEOF_VOID_P <= SIZEOF_LONG
- typedef unsigned long Py_uintptr_t;
- typedef long Py_intptr_t;
-
- #elif defined(HAVE_LONG_LONG) && (SIZEOF_VOID_P <= SIZEOF_LONG_LONG)
- typedef unsigned LONG_LONG Py_uintptr_t;
- typedef LONG_LONG Py_intptr_t;
-
- #else
- # error "Python needs a typedef for Py_uintptr_t in pyport.h."
- #endif /* HAVE_UINTPTR_T */
-
- #ifdef HAVE_STDLIB_H
- #include <stdlib.h>
- #endif
-
- #include <math.h> /* Moved here from the math section, before extern "C" */
-
- /********************************************
- * WRAPPER FOR <time.h> and/or <sys/time.h> *
- ********************************************/
-
- #ifdef TIME_WITH_SYS_TIME
- #include <sys/time.h>
- #include <time.h>
- #else /* !TIME_WITH_SYS_TIME */
- #ifdef HAVE_SYS_TIME_H
- #include <sys/time.h>
- #else /* !HAVE_SYS_TIME_H */
- #include <time.h>
- #endif /* !HAVE_SYS_TIME_H */
- #endif /* !TIME_WITH_SYS_TIME */
-
-
- /******************************
- * WRAPPER FOR <sys/select.h> *
- ******************************/
-
- /* NB caller must include <sys/types.h> */
-
- #ifdef HAVE_SYS_SELECT_H
-
- #include <sys/select.h>
-
- #else /* !HAVE_SYS_SELECT_H */
-
- #ifdef USE_GUSI1
- /* If we don't have sys/select the definition may be in unistd.h */
- #include <GUSI.h>
- #endif
-
- #endif /* !HAVE_SYS_SELECT_H */
-
- /*******************************
- * stat() and fstat() fiddling *
- *******************************/
-
- /* We expect that stat and fstat exist on most systems.
- * It's confirmed on Unix, Mac and Windows.
- * If you don't have them, add
- * #define DONT_HAVE_STAT
- * and/or
- * #define DONT_HAVE_FSTAT
- * to your pyconfig.h. Python code beyond this should check HAVE_STAT and
- * HAVE_FSTAT instead.
- * Also
- * #define DONT_HAVE_SYS_STAT_H
- * if <sys/stat.h> doesn't exist on your platform, and
- * #define HAVE_STAT_H
- * if <stat.h> does (don't look at me -- ths mess is inherited).
- */
- #ifndef DONT_HAVE_STAT
- #define HAVE_STAT
- #endif
-
- #ifndef DONT_HAVE_FSTAT
- #define HAVE_FSTAT
- #endif
-
- #ifdef RISCOS
- #include <sys/types.h>
- #endif
-
- #ifndef DONT_HAVE_SYS_STAT_H
- #include <sys/stat.h>
- #elif defined(HAVE_STAT_H)
- #include <stat.h>
- #endif
-
- #if defined(PYCC_VACPP)
- /* VisualAge C/C++ Failed to Define MountType Field in sys/stat.h */
- #define S_IFMT (S_IFDIR|S_IFCHR|S_IFREG)
- #endif
-
- #ifndef S_ISREG
- #define S_ISREG(x) (((x) & S_IFMT) == S_IFREG)
- #endif
-
- #ifndef S_ISDIR
- #define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
- #endif
-
-
- #ifdef __cplusplus
- /* Move this down here since some C++ #include's don't like to be included
- inside an extern "C" */
- extern "C" {
- #endif
-
-
- /* Py_ARITHMETIC_RIGHT_SHIFT
- * C doesn't define whether a right-shift of a signed integer sign-extends
- * or zero-fills. Here a macro to force sign extension:
- * Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J)
- * Return I >> J, forcing sign extension.
- * Requirements:
- * I is of basic signed type TYPE (char, short, int, long, or long long).
- * TYPE is one of char, short, int, long, or long long, although long long
- * must not be used except on platforms that support it.
- * J is an integer >= 0 and strictly less than the number of bits in TYPE
- * (because C doesn't define what happens for J outside that range either).
- * Caution:
- * I may be evaluated more than once.
- */
- #ifdef SIGNED_RIGHT_SHIFT_ZERO_FILLS
- #define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) \
- ((I) < 0 ? ~((~(unsigned TYPE)(I)) >> (J)) : (I) >> (J))
- #else
- #define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) ((I) >> (J))
- #endif
-
- /* Py_FORCE_EXPANSION(X)
- * "Simply" returns its argument. However, macro expansions within the
- * argument are evaluated. This unfortunate trickery is needed to get
- * token-pasting to work as desired in some cases.
- */
- #define Py_FORCE_EXPANSION(X) X
-
- /* Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW)
- * Cast VALUE to type NARROW from type WIDE. In Py_DEBUG mode, this
- * assert-fails if any information is lost.
- * Caution:
- * VALUE may be evaluated more than once.
- */
- #ifdef Py_DEBUG
- #define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) \
- (assert((WIDE)(NARROW)(VALUE) == (VALUE)), (NARROW)(VALUE))
- #else
- #define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) (NARROW)(VALUE)
- #endif
-
- /* Py_IS_INFINITY(X)
- * Return 1 if float or double arg is an infinity, else 0.
- * Caution:
- * X is evaluated more than once.
- * This implementation may set the underflow flag if |X| is very small;
- * it really can't be implemented correctly (& easily) before C99.
- */
- #define Py_IS_INFINITY(X) ((X) && (X)*0.5 == (X))
-
- /* According to
- * http://www.cray.com/swpubs/manuals/SN-2194_2.0/html-SN-2194_2.0/x3138.htm
- * on some Cray systems HUGE_VAL is incorrectly (according to the C std)
- * defined to be the largest positive finite rather than infinity. We need
- * the std-conforming infinity meaning (provided the platform has one!).
- *
- * Then, according to a bug report on SourceForge, defining Py_HUGE_VAL as
- * INFINITY caused internal compiler errors under BeOS using some version
- * of gcc. Explicitly casting INFINITY to double made that problem go away.
- */
- #ifdef INFINITY
- #define Py_HUGE_VAL ((double)INFINITY)
- #else
- #define Py_HUGE_VAL HUGE_VAL
- #endif
-
- /* Py_OVERFLOWED(X)
- * Return 1 iff a libm function overflowed. Set errno to 0 before calling
- * a libm function, and invoke this macro after, passing the function
- * result.
- * Caution:
- * This isn't reliable. C99 no longer requires libm to set errno under
- * any exceptional condition, but does require +- HUGE_VAL return
- * values on overflow. A 754 box *probably* maps HUGE_VAL to a
- * double infinity, and we're cool if that's so, unless the input
- * was an infinity and an infinity is the expected result. A C89
- * system sets errno to ERANGE, so we check for that too. We're
- * out of luck if a C99 754 box doesn't map HUGE_VAL to +Inf, or
- * if the returned result is a NaN, or if a C89 box returns HUGE_VAL
- * in non-overflow cases.
- * X is evaluated more than once.
- */
- #define Py_OVERFLOWED(X) ((X) != 0.0 && (errno == ERANGE || \
- (X) == Py_HUGE_VAL || \
- (X) == -Py_HUGE_VAL))
-
- /* Py_SET_ERANGE_ON_OVERFLOW(x)
- * If a libm function did not set errno, but it looks like the result
- * overflowed, set errno to ERANGE. Set errno to 0 before calling a libm
- * function, and invoke this macro after, passing the function result.
- * Caution:
- * This isn't reliable. See Py_OVERFLOWED comments.
- * X is evaluated more than once.
- */
- #define Py_SET_ERANGE_IF_OVERFLOW(X) \
- do { \
- if (errno == 0 && ((X) == Py_HUGE_VAL || \
- (X) == -Py_HUGE_VAL)) \
- errno = ERANGE; \
- } while(0)
-
- /* Py_ADJUST_ERANGE1(x)
- * Py_ADJUST_ERANGE2(x, y)
- * Set errno to 0 before calling a libm function, and invoke one of these
- * macros after, passing the function result(s) (Py_ADJUST_ERANGE2 is useful
- * for functions returning complex results). This makes two kinds of
- * adjustments to errno: (A) If it looks like the platform libm set
- * errno=ERANGE due to underflow, clear errno. (B) If it looks like the
- * platform libm overflowed but didn't set errno, force errno to ERANGE. In
- * effect, we're trying to force a useful implementation of C89 errno
- * behavior.
- * Caution:
- * This isn't reliable. See Py_OVERFLOWED comments.
- * X and Y may be evaluated more than once.
- */
- #define Py_ADJUST_ERANGE1(X) \
- do { \
- if (errno == 0) { \
- if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL) \
- errno = ERANGE; \
- } \
- else if (errno == ERANGE && (X) == 0.0) \
- errno = 0; \
- } while(0)
-
- #define Py_ADJUST_ERANGE2(X, Y) \
- do { \
- if ((X) == Py_HUGE_VAL || (X) == -Py_HUGE_VAL || \
- (Y) == Py_HUGE_VAL || (Y) == -Py_HUGE_VAL) { \
- if (errno == 0) \
- errno = ERANGE; \
- } \
- else if (errno == ERANGE) \
- errno = 0; \
- } while(0)
-
- /**************************************************************************
- Prototypes that are missing from the standard include files on some systems
- (and possibly only some versions of such systems.)
-
- Please be conservative with adding new ones, document them and enclose them
- in platform-specific #ifdefs.
- **************************************************************************/
-
- #ifdef SOLARIS
- /* Unchecked */
- extern int gethostname(char *, int);
- #endif
-
- #ifdef __BEOS__
- /* Unchecked */
- /* It's in the libs, but not the headers... - [cjh] */
- int shutdown( int, int );
- #endif
-
- #ifdef HAVE__GETPTY
- #include <sys/types.h> /* we need to import mode_t */
- extern char * _getpty(int *, int, mode_t, int);
- #endif
-
- #if defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY)
- #if !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H)
- /* BSDI does not supply a prototype for the 'openpty' and 'forkpty'
- functions, even though they are included in libutil. */
- #include <termios.h>
- extern int openpty(int *, int *, char *, struct termios *, struct winsize *);
- extern int forkpty(int *, char *, struct termios *, struct winsize *);
- #endif /* !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H) */
- #endif /* defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY) */
-
-
- /* These are pulled from various places. It isn't obvious on what platforms
- they are necessary, nor what the exact prototype should look like (which
- is likely to vary between platforms!) If you find you need one of these
- declarations, please move them to a platform-specific block and include
- proper prototypes. */
- #if 0
-
- /* From Modules/resource.c */
- extern int getrusage();
- extern int getpagesize();
-
- /* From Python/sysmodule.c and Modules/posixmodule.c */
- extern int fclose(FILE *);
-
- /* From Modules/posixmodule.c */
- extern int fdatasync(int);
- /* XXX These are supposedly for SunOS4.1.3 but "shouldn't hurt elsewhere" */
- extern int rename(const char *, const char *);
- extern int pclose(FILE *);
- extern int lstat(const char *, struct stat *);
- extern int symlink(const char *, const char *);
- extern int fsync(int fd);
-
- #endif /* 0 */
-
-
- /************************
- * WRAPPER FOR <math.h> *
- ************************/
-
- #ifndef HAVE_HYPOT
- extern double hypot(double, double);
- #endif
-
-
- /************************************
- * MALLOC COMPATIBILITY FOR pymem.h *
- ************************************/
-
- #ifndef DL_IMPORT /* declarations for DLL import */
- #define DL_IMPORT(RTYPE) RTYPE
- #endif
-
- #ifdef MALLOC_ZERO_RETURNS_NULL
- /* Allocate an extra byte if the platform malloc(0) returns NULL.
- Caution: this bears no relation to whether realloc(p, 0) returns NULL
- when p != NULL. Even on platforms where malloc(0) does not return NULL,
- realloc(p, 0) may act like free(p) and return NULL. Examples include
- Windows, and Python's own obmalloc.c (as of 2-Mar-2002). For whatever
- reason, our docs promise that PyMem_Realloc(p, 0) won't act like
- free(p) or return NULL, so realloc() calls may have to be hacked
- too, but MALLOC_ZERO_RETURNS_NULL's state is irrelevant to realloc (it
- needs a different hack).
- */
- #define _PyMem_EXTRA 1
- #else
- #define _PyMem_EXTRA 0
- #endif
-
-
- /* If the fd manipulation macros aren't defined,
- here is a set that should do the job */
-
- #if 0 /* disabled and probably obsolete */
-
- #ifndef FD_SETSIZE
- #define FD_SETSIZE 256
- #endif
-
- #ifndef FD_SET
-
- typedef long fd_mask;
-
- #define NFDBITS (sizeof(fd_mask) * NBBY) /* bits per mask */
- #ifndef howmany
- #define howmany(x, y) (((x)+((y)-1))/(y))
- #endif /* howmany */
-
- typedef struct fd_set {
- fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
- } fd_set;
-
- #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
- #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
- #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
- #define FD_ZERO(p) memset((char *)(p), '\0', sizeof(*(p)))
-
- #endif /* FD_SET */
-
- #endif /* fd manipulation macros */
-
-
- /* limits.h constants that may be missing */
-
- #ifndef INT_MAX
- #define INT_MAX 2147483647
- #endif
-
- #ifndef LONG_MAX
- #if SIZEOF_LONG == 4
- #define LONG_MAX 0X7FFFFFFFL
- #elif SIZEOF_LONG == 8
- #define LONG_MAX 0X7FFFFFFFFFFFFFFFL
- #else
- #error "could not set LONG_MAX in pyport.h"
- #endif
- #endif
-
- #ifndef LONG_MIN
- #define LONG_MIN (-LONG_MAX-1)
- #endif
-
- #ifndef LONG_BIT
- #define LONG_BIT (8 * SIZEOF_LONG)
- #endif
-
- #if LONG_BIT != 8 * SIZEOF_LONG
- /* 04-Oct-2000 LONG_BIT is apparently (mis)defined as 64 on some recent
- * 32-bit platforms using gcc. We try to catch that here at compile-time
- * rather than waiting for integer multiplication to trigger bogus
- * overflows.
- */
- #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
- #endif
-
- /*
- * Rename some functions for the Borland compiler
- */
- #ifdef __BORLANDC__
- # include <io.h>
- # define _chsize chsize
- # define _setmode setmode
- #endif
-
- #ifdef __cplusplus
- }
- #endif
-
- /*
- * Hide GCC attributes from compilers that don't support them.
- */
- #if (!defined(__GNUC__) || __GNUC__ < 2 || \
- (__GNUC__ == 2 && __GNUC_MINOR__ < 7) || \
- defined(NEXT) ) && \
- !defined(RISCOS)
- #define __attribute__(__x)
- #endif
-
- #endif /* Py_PYPORT_H */
-