mirror of
https://github.com/python/cpython.git
synced 2024-11-30 01:16:51 +01:00
144 lines
4.7 KiB
C
144 lines
4.7 KiB
C
/***********************************************************
|
|
Copyright (c) 2000, BeOpen.com.
|
|
All rights reserved.
|
|
|
|
See the file "Misc/COPYRIGHT" for information on usage and
|
|
redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
|
******************************************************************/
|
|
|
|
#ifndef Py_PYPORT_H
|
|
#define Py_PYPORT_H
|
|
|
|
/**************************************************************************
|
|
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
|
|
**************************************************************************/
|
|
|
|
|
|
#ifdef __cplusplus
|
|
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
|
|
* "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
|
|
|
|
|
|
|
|
/**************************************************************************
|
|
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 */
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* Py_PYPORT_H */
|