461 lines
13 KiB
C
461 lines
13 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
|
|
**************************************************************************/
|
|
|
|
|
|
#define ANY void /* For API compatibility only. Obsolete, do not use. */
|
|
|
|
#ifdef HAVE_STDLIB_H
|
|
#include <stdlib.h>
|
|
#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
|
|
* "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 */
|
|
|
|
|
|
/************************
|
|
* WRAPPER FOR <math.h> *
|
|
************************/
|
|
|
|
/* On the 68K Mac, when using CFM (Code Fragment Manager),
|
|
<math.h> requires special treatment -- we need to surround it with
|
|
#pragma lib_export off / on...
|
|
This is because MathLib.o is a static library, and exporting its
|
|
symbols doesn't quite work...
|
|
XXX Not sure now... Seems to be something else going on as well... */
|
|
|
|
#ifndef HAVE_HYPOT
|
|
extern double hypot(double, double);
|
|
#ifdef MWERKS_BEFORE_PRO4
|
|
#define hypot we_dont_want_faulty_hypot_decl
|
|
#endif
|
|
#endif
|
|
|
|
#include <math.h>
|
|
|
|
#ifndef HAVE_HYPOT
|
|
#ifdef __MWERKS__
|
|
#undef hypot
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(USE_MSL) && defined(__MC68K__)
|
|
/* CodeWarrior MSL 2.1.1 has weird define overrides that don't work
|
|
** when you take the address of math functions. If I interpret the
|
|
** ANSI C standard correctly this is illegal, but I haven't been able
|
|
** to convince the MetroWerks folks of this...
|
|
*/
|
|
#undef acos
|
|
#undef asin
|
|
#undef atan
|
|
#undef atan2
|
|
#undef ceil
|
|
#undef cos
|
|
#undef cosh
|
|
#undef exp
|
|
#undef fabs
|
|
#undef floor
|
|
#undef fmod
|
|
#undef log
|
|
#undef log10
|
|
#undef pow
|
|
#undef rint
|
|
#undef sin
|
|
#undef sinh
|
|
#undef sqrt
|
|
#undef tan
|
|
#undef tanh
|
|
#define acos acosd
|
|
#define asin asind
|
|
#define atan atand
|
|
#define atan2 atan2d
|
|
#define ceil ceild
|
|
#define cos cosd
|
|
#define cosh coshd
|
|
#define exp expd
|
|
#define fabs fabsd
|
|
#define floor floord
|
|
#define fmod fmodd
|
|
#define log logd
|
|
#define log10 log10d
|
|
#define pow powd
|
|
#define rint rintd
|
|
#define sin sind
|
|
#define sinh sinhd
|
|
#define sqrt sqrtd
|
|
#define tan tand
|
|
#define tanh tanhd
|
|
#endif
|
|
|
|
|
|
/***********************************
|
|
* WRAPPER FOR malloc/realloc/free *
|
|
***********************************/
|
|
|
|
#ifndef DL_IMPORT /* declarations for DLL import */
|
|
#define DL_IMPORT(RTYPE) RTYPE
|
|
#endif
|
|
|
|
#ifndef NULL
|
|
#define NULL ((void *)0)
|
|
#endif
|
|
|
|
#ifdef MALLOC_ZERO_RETURNS_NULL
|
|
/* XXX Always allocate one extra byte, since some malloc's return NULL
|
|
XXX for malloc(0) or realloc(p, 0). */
|
|
#define _PyMem_EXTRA 1
|
|
#else
|
|
#define _PyMem_EXTRA 0
|
|
#endif
|
|
|
|
/*
|
|
* Core memory allocator
|
|
* =====================
|
|
*/
|
|
|
|
/* To make sure the interpreter is user-malloc friendly, all memory
|
|
APIs are implemented on top of this one.
|
|
|
|
The PyCore_* macros can be defined to make the interpreter use a
|
|
custom allocator. Note that they are for internal use only. Both
|
|
the core and extension modules should use the PyMem_* API.
|
|
|
|
See the comment block at the end of this file for two scenarios
|
|
showing how to use this to use a different allocator. */
|
|
|
|
#ifndef PyCore_MALLOC_FUNC
|
|
#undef PyCore_REALLOC_FUNC
|
|
#undef PyCore_FREE_FUNC
|
|
#define PyCore_MALLOC_FUNC malloc
|
|
#define PyCore_REALLOC_FUNC realloc
|
|
#define PyCore_FREE_FUNC free
|
|
#endif
|
|
|
|
#ifndef PyCore_MALLOC_PROTO
|
|
#undef PyCore_REALLOC_PROTO
|
|
#undef PyCore_FREE_PROTO
|
|
#define PyCore_MALLOC_PROTO (size_t)
|
|
#define PyCore_REALLOC_PROTO (void *, size_t)
|
|
#define PyCore_FREE_PROTO (void *)
|
|
#endif
|
|
|
|
#ifdef NEED_TO_DECLARE_MALLOC_AND_FRIEND
|
|
extern void *PyCore_MALLOC_FUNC PyCore_MALLOC_PROTO;
|
|
extern void *PyCore_REALLOC_FUNC PyCore_REALLOC_PROTO;
|
|
extern void PyCore_FREE_FUNC PyCore_FREE_PROTO;
|
|
#endif
|
|
|
|
#ifndef PyCore_MALLOC
|
|
#undef PyCore_REALLOC
|
|
#undef PyCore_FREE
|
|
#define PyCore_MALLOC(n) PyCore_MALLOC_FUNC(n)
|
|
#define PyCore_REALLOC(p, n) PyCore_REALLOC_FUNC((p), (n))
|
|
#define PyCore_FREE(p) PyCore_FREE_FUNC(p)
|
|
#endif
|
|
|
|
/* BEWARE:
|
|
|
|
Each interface exports both functions and macros. Extension modules
|
|
should normally use the functions for ensuring binary compatibility
|
|
of the user's code across Python versions. Subsequently, if the
|
|
Python runtime switches to its own malloc (different from standard
|
|
malloc), no recompilation is required for the extensions.
|
|
|
|
The macro versions trade compatibility for speed. They can be used
|
|
whenever there is a performance problem, but their use implies
|
|
recompilation of the code for each new Python release. The Python
|
|
core uses the macros because it *is* compiled on every upgrade.
|
|
This might not be the case with 3rd party extensions in a custom
|
|
setup (for example, a customer does not always have access to the
|
|
source of 3rd party deliverables). You have been warned! */
|
|
|
|
/*
|
|
* Raw memory interface
|
|
* ====================
|
|
*/
|
|
|
|
/* Functions */
|
|
|
|
/* Function wrappers around PyCore_MALLOC and friends; useful if you
|
|
need to be sure that you are using the same memory allocator as
|
|
Python. Note that the wrappers make sure that allocating 0 bytes
|
|
returns a non-NULL pointer, even if the underlying malloc
|
|
doesn't. Returned pointers must be checked for NULL explicitly.
|
|
No action is performed on failure. */
|
|
extern DL_IMPORT(void *) PyMem_Malloc(size_t);
|
|
extern DL_IMPORT(void *) PyMem_Realloc(void *, size_t);
|
|
extern DL_IMPORT(void) PyMem_Free(void *);
|
|
|
|
/* Starting from Python 1.6, the wrappers Py_{Malloc,Realloc,Free} are
|
|
no longer supported. They used to call PyErr_NoMemory() on failure. */
|
|
|
|
/* Macros */
|
|
#define PyMem_MALLOC(n) PyCore_MALLOC(n)
|
|
#define PyMem_REALLOC(p, n) PyCore_REALLOC((void *)(p), (n))
|
|
#define PyMem_FREE(p) PyCore_FREE((void *)(p))
|
|
|
|
/*
|
|
* Type-oriented memory interface
|
|
* ==============================
|
|
*/
|
|
|
|
/* Functions */
|
|
#define PyMem_New(type, n) \
|
|
( (type *) PyMem_Malloc((n) * sizeof(type)) )
|
|
#define PyMem_Resize(p, type, n) \
|
|
( (p) = (type *) PyMem_Realloc((n) * sizeof(type)) )
|
|
#define PyMem_Del(p) PyMem_Free(p)
|
|
|
|
/* Macros */
|
|
#define PyMem_NEW(type, n) \
|
|
( (type *) PyMem_MALLOC(_PyMem_EXTRA + (n) * sizeof(type)) )
|
|
#define PyMem_RESIZE(p, type, n) \
|
|
if ((p) == NULL) \
|
|
(p) = (type *)(PyMem_MALLOC( \
|
|
_PyMem_EXTRA + (n) * sizeof(type))); \
|
|
else \
|
|
(p) = (type *)(PyMem_REALLOC((p), \
|
|
_PyMem_EXTRA + (n) * sizeof(type)))
|
|
#define PyMem_DEL(p) PyMem_FREE(p)
|
|
|
|
/* PyMem_XDEL is deprecated. To avoid the call when p is NULL,
|
|
it is recommended to write the test explicitly in the code.
|
|
Note that according to ANSI C, free(NULL) has no effect. */
|
|
|
|
/* SCENARIOS
|
|
|
|
Here are two scenarios by Vladimir Marangozov (the author of the
|
|
memory allocation redesign).
|
|
|
|
1) Scenario A
|
|
|
|
Suppose you want to use a debugging malloc library that collects info on
|
|
where the malloc calls originate from. Assume the interface is:
|
|
|
|
d_malloc(size_t n, char* src_file, unsigned long src_line) c.s.
|
|
|
|
In this case, you would define (for example in config.h) :
|
|
|
|
#define PyCore_MALLOC_FUNC d_malloc
|
|
...
|
|
#define PyCore_MALLOC_PROTO (size_t, char *, unsigned long)
|
|
...
|
|
#define NEED_TO_DECLARE_MALLOC_AND_FRIEND
|
|
|
|
#define PyCore_MALLOC(n) PyCore_MALLOC_FUNC((n), __FILE__, __LINE__)
|
|
...
|
|
|
|
2) Scenario B
|
|
|
|
Suppose you want to use malloc hooks (defined & initialized in a 3rd party
|
|
malloc library) instead of malloc functions. In this case, you would
|
|
define:
|
|
|
|
#define PyCore_MALLOC_FUNC (*malloc_hook)
|
|
...
|
|
#define NEED_TO_DECLARE_MALLOC_AND_FRIEND
|
|
|
|
and ignore the previous definitions about PyCore_MALLOC_FUNC, etc.
|
|
|
|
|
|
*/
|
|
|
|
/********************************************
|
|
* 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 */
|
|
|
|
/* If the fd manipulation macros aren't defined,
|
|
here is a set that should do the job */
|
|
|
|
#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 */
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* Py_PYPORT_H */
|