mirror of https://github.com/python/cpython
317 lines
8.5 KiB
C
317 lines
8.5 KiB
C
/***********************************************************
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Copyright (c) 2000, BeOpen.com.
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All rights reserved.
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See the file "Misc/COPYRIGHT" for information on usage and
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redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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******************************************************************/
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#ifndef Py_PYPORT_H
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#define Py_PYPORT_H
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#include "config.h" /* include for defines */
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/**************************************************************************
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Symbols and macros to supply platform-independent interfaces to basic
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C language & library operations whose spellings vary across platforms.
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Please try to make documentation here as clear as possible: by definition,
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the stuff here is trying to illuminate C's darkest corners.
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Config #defines referenced here:
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SIGNED_RIGHT_SHIFT_ZERO_FILLS
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Meaning: To be defined iff i>>j does not extend the sign bit when i is a
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signed integral type and i < 0.
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Used in: Py_ARITHMETIC_RIGHT_SHIFT
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Py_DEBUG
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Meaning: Extra checks compiled in for debug mode.
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Used in: Py_SAFE_DOWNCAST
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**************************************************************************/
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#define ANY void /* For API compatibility only. Obsolete, do not use. */
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef __cplusplus
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/* Move this down here since some C++ #include's don't like to be included
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inside an extern "C" */
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extern "C" {
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#endif
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/* Py_ARITHMETIC_RIGHT_SHIFT
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* C doesn't define whether a right-shift of a signed integer sign-extends
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* or zero-fills. Here a macro to force sign extension:
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* Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J)
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* Return I >> J, forcing sign extension.
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* Requirements:
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* I is of basic signed type TYPE (char, short, int, long, or long long).
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* TYPE is one of char, short, int, long, or long long, although long long
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* must not be used except on platforms that support it.
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* J is an integer >= 0 and strictly less than the number of bits in TYPE
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* (because C doesn't define what happens for J outside that range either).
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* Caution:
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* I may be evaluated more than once.
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*/
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#ifdef SIGNED_RIGHT_SHIFT_ZERO_FILLS
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#define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) \
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((I) < 0 ? ~((~(unsigned TYPE)(I)) >> (J)) : (I) >> (J))
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#else
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#define Py_ARITHMETIC_RIGHT_SHIFT(TYPE, I, J) ((I) >> (J))
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#endif
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/* Py_FORCE_EXPANSION
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* "Simply" returns its argument. However, macro expansions within the
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* argument are evaluated. This unfortunate trickery is needed to get
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* token-pasting to work as desired in some cases.
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*/
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#define Py_FORCE_EXPANSION(X) X
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/* Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW)
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* Cast VALUE to type NARROW from type WIDE. In Py_DEBUG mode, this
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* assert-fails if any information is lost.
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* Caution:
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* VALUE may be evaluated more than once.
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*/
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#ifdef Py_DEBUG
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#define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) \
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(assert((WIDE)(NARROW)(VALUE) == (VALUE)), (NARROW)(VALUE))
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#else
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#define Py_SAFE_DOWNCAST(VALUE, WIDE, NARROW) (NARROW)(VALUE)
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#endif
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/**************************************************************************
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Prototypes that are missing from the standard include files on some systems
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(and possibly only some versions of such systems.)
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Please be conservative with adding new ones, document them and enclose them
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in platform-specific #ifdefs.
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**************************************************************************/
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#ifdef SOLARIS
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/* Unchecked */
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extern int gethostname(char *, int);
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#endif
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#ifdef __BEOS__
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/* Unchecked */
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/* It's in the libs, but not the headers... - [cjh] */
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int shutdown( int, int );
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#endif
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#ifdef HAVE__GETPTY
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#include <sys/types.h> /* we need to import mode_t */
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extern char * _getpty(int *, int, mode_t, int);
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#endif
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#if defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY)
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#if !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H)
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/* BSDI does not supply a prototype for the 'openpty' and 'forkpty'
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functions, even though they are included in libutil. */
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#include <termios.h>
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extern int openpty(int *, int *, char *, struct termios *, struct winsize *);
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extern int forkpty(int *, char *, struct termios *, struct winsize *);
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#endif /* !defined(HAVE_PTY_H) && !defined(HAVE_LIBUTIL_H) */
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#endif /* defined(HAVE_OPENPTY) || defined(HAVE_FORKPTY) */
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/* These are pulled from various places. It isn't obvious on what platforms
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they are necessary, nor what the exact prototype should look like (which
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is likely to vary between platforms!) If you find you need one of these
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declarations, please move them to a platform-specific block and include
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proper prototypes. */
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#if 0
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/* From Modules/resource.c */
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extern int getrusage();
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extern int getpagesize();
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/* From Python/sysmodule.c and Modules/posixmodule.c */
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extern int fclose(FILE *);
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/* From Modules/posixmodule.c */
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extern int fdatasync(int);
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/* XXX These are supposedly for SunOS4.1.3 but "shouldn't hurt elsewhere" */
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extern int rename(const char *, const char *);
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extern int pclose(FILE *);
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extern int lstat(const char *, struct stat *);
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extern int symlink(const char *, const char *);
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extern int fsync(int fd);
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#endif /* 0 */
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/************************
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* WRAPPER FOR <math.h> *
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************************/
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/* On the 68K Mac, when using CFM (Code Fragment Manager),
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<math.h> requires special treatment -- we need to surround it with
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#pragma lib_export off / on...
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This is because MathLib.o is a static library, and exporting its
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symbols doesn't quite work...
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XXX Not sure now... Seems to be something else going on as well... */
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#ifndef HAVE_HYPOT
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extern double hypot(double, double);
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#ifdef MWERKS_BEFORE_PRO4
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#define hypot we_dont_want_faulty_hypot_decl
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#endif
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#endif
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#include <math.h>
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#ifndef HAVE_HYPOT
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#ifdef __MWERKS__
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#undef hypot
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#endif
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#endif
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#if defined(USE_MSL) && defined(__MC68K__)
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/* CodeWarrior MSL 2.1.1 has weird define overrides that don't work
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** when you take the address of math functions. If I interpret the
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** ANSI C standard correctly this is illegal, but I haven't been able
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** to convince the MetroWerks folks of this...
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*/
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#undef acos
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#undef asin
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#undef atan
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#undef atan2
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#undef ceil
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#undef cos
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#undef cosh
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#undef exp
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#undef fabs
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#undef floor
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#undef fmod
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#undef log
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#undef log10
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#undef pow
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#undef rint
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#undef sin
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#undef sinh
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#undef sqrt
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#undef tan
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#undef tanh
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#define acos acosd
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#define asin asind
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#define atan atand
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#define atan2 atan2d
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#define ceil ceild
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#define cos cosd
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#define cosh coshd
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#define exp expd
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#define fabs fabsd
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#define floor floord
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#define fmod fmodd
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#define log logd
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#define log10 log10d
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#define pow powd
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#define rint rintd
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#define sin sind
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#define sinh sinhd
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#define sqrt sqrtd
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#define tan tand
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#define tanh tanhd
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#endif
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/************************************
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* MALLOC COMPATIBILITY FOR pymem.h *
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************************************/
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#ifndef DL_IMPORT /* declarations for DLL import */
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#define DL_IMPORT(RTYPE) RTYPE
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#endif
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#ifndef NULL
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#define NULL ((void *)0)
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#endif
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#ifdef MALLOC_ZERO_RETURNS_NULL
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/* XXX Always allocate one extra byte, since some malloc's return NULL
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XXX for malloc(0) or realloc(p, 0). */
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#define _PyMem_EXTRA 1
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#else
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#define _PyMem_EXTRA 0
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#endif
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/********************************************
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* WRAPPER FOR <time.h> and/or <sys/time.h> *
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********************************************/
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#ifdef TIME_WITH_SYS_TIME
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#include <sys/time.h>
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#include <time.h>
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#else /* !TIME_WITH_SYS_TIME */
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#else /* !HAVE_SYS_TIME_H */
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#include <time.h>
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#endif /* !HAVE_SYS_TIME_H */
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#endif /* !TIME_WITH_SYS_TIME */
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/******************************
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* WRAPPER FOR <sys/select.h> *
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******************************/
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/* NB caller must include <sys/types.h> */
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#else /* !HAVE_SYS_SELECT_H */
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#ifdef USE_GUSI1
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/* If we don't have sys/select the definition may be in unistd.h */
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#include <GUSI.h>
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#endif
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#endif /* !HAVE_SYS_SELECT_H */
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/* If the fd manipulation macros aren't defined,
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here is a set that should do the job */
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#if 0 /* disabled and probably obsolete */
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#ifndef FD_SETSIZE
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#define FD_SETSIZE 256
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#endif
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#ifndef FD_SET
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typedef long fd_mask;
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#define NFDBITS (sizeof(fd_mask) * NBBY) /* bits per mask */
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#ifndef howmany
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#define howmany(x, y) (((x)+((y)-1))/(y))
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#endif /* howmany */
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typedef struct fd_set {
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fd_mask fds_bits[howmany(FD_SETSIZE, NFDBITS)];
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} fd_set;
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#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
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#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
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#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
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#define FD_ZERO(p) memset((char *)(p), '\0', sizeof(*(p)))
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#endif /* FD_SET */
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#endif /* fd manipulation macros */
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#ifdef __cplusplus
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}
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#endif
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#endif /* Py_PYPORT_H */
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