PostgreSQL Source Code  git master
c.h
Go to the documentation of this file.
1 /*-------------------------------------------------------------------------
2  *
3  * c.h
4  * Fundamental C definitions. This is included by every .c file in
5  * PostgreSQL (via either postgres.h or postgres_fe.h, as appropriate).
6  *
7  * Note that the definitions here are not intended to be exposed to clients
8  * of the frontend interface libraries --- so we don't worry much about
9  * polluting the namespace with lots of stuff...
10  *
11  *
12  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
13  * Portions Copyright (c) 1994, Regents of the University of California
14  *
15  * src/include/c.h
16  *
17  *-------------------------------------------------------------------------
18  */
19 /*
20  *----------------------------------------------------------------
21  * TABLE OF CONTENTS
22  *
23  * When adding stuff to this file, please try to put stuff
24  * into the relevant section, or add new sections as appropriate.
25  *
26  * section description
27  * ------- ------------------------------------------------
28  * 0) pg_config.h and standard system headers
29  * 1) compiler characteristics
30  * 2) bool, true, false
31  * 3) standard system types
32  * 4) IsValid macros for system types
33  * 5) offsetof, lengthof, alignment
34  * 6) assertions
35  * 7) widely useful macros
36  * 8) random stuff
37  * 9) system-specific hacks
38  *
39  * NOTE: since this file is included by both frontend and backend modules,
40  * it's usually wrong to put an "extern" declaration here, unless it's
41  * ifdef'd so that it's seen in only one case or the other.
42  * typedefs and macros are the kind of thing that might go here.
43  *
44  *----------------------------------------------------------------
45  */
46 #ifndef C_H
47 #define C_H
48 
49 #include "postgres_ext.h"
50 
51 /* Must undef pg_config_ext.h symbols before including pg_config.h */
52 #undef PG_INT64_TYPE
53 
54 #include "pg_config.h"
55 #include "pg_config_manual.h" /* must be after pg_config.h */
56 #include "pg_config_os.h" /* must be before any system header files */
57 
58 /* System header files that should be available everywhere in Postgres */
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <stddef.h>
63 #include <stdarg.h>
64 #ifdef HAVE_STRINGS_H
65 #include <strings.h>
66 #endif
67 #include <stdint.h>
68 #include <sys/types.h>
69 #include <errno.h>
70 #if defined(WIN32) || defined(__CYGWIN__)
71 #include <fcntl.h> /* ensure O_BINARY is available */
72 #endif
73 #include <locale.h>
74 #ifdef ENABLE_NLS
75 #include <libintl.h>
76 #endif
77 
78 
79 /* ----------------------------------------------------------------
80  * Section 1: compiler characteristics
81  *
82  * type prefixes (const, signed, volatile, inline) are handled in pg_config.h.
83  * ----------------------------------------------------------------
84  */
85 
86 /*
87  * Disable "inline" if PG_FORCE_DISABLE_INLINE is defined.
88  * This is used to work around compiler bugs and might also be useful for
89  * investigatory purposes.
90  */
91 #ifdef PG_FORCE_DISABLE_INLINE
92 #undef inline
93 #define inline
94 #endif
95 
96 /*
97  * Attribute macros
98  *
99  * GCC: https://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html
100  * GCC: https://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html
101  * Sunpro: https://docs.oracle.com/cd/E18659_01/html/821-1384/gjzke.html
102  * XLC: https://www.ibm.com/support/knowledgecenter/SSGH2K_13.1.2/com.ibm.xlc131.aix.doc/language_ref/function_attributes.html
103  * XLC: https://www.ibm.com/support/knowledgecenter/SSGH2K_13.1.2/com.ibm.xlc131.aix.doc/language_ref/type_attrib.html
104  */
105 
106 /* only GCC supports the unused attribute */
107 #ifdef __GNUC__
108 #define pg_attribute_unused() __attribute__((unused))
109 #else
110 #define pg_attribute_unused()
111 #endif
112 
113 /*
114  * Append PG_USED_FOR_ASSERTS_ONLY to definitions of variables that are only
115  * used in assert-enabled builds, to avoid compiler warnings about unused
116  * variables in assert-disabled builds.
117  */
118 #ifdef USE_ASSERT_CHECKING
119 #define PG_USED_FOR_ASSERTS_ONLY
120 #else
121 #define PG_USED_FOR_ASSERTS_ONLY pg_attribute_unused()
122 #endif
123 
124 /* GCC and XLC support format attributes */
125 #if defined(__GNUC__) || defined(__IBMC__)
126 #define pg_attribute_format_arg(a) __attribute__((format_arg(a)))
127 #define pg_attribute_printf(f,a) __attribute__((format(PG_PRINTF_ATTRIBUTE, f, a)))
128 #else
129 #define pg_attribute_format_arg(a)
130 #define pg_attribute_printf(f,a)
131 #endif
132 
133 /* GCC, Sunpro and XLC support aligned, packed and noreturn */
134 #if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__)
135 #define pg_attribute_aligned(a) __attribute__((aligned(a)))
136 #define pg_attribute_noreturn() __attribute__((noreturn))
137 #define pg_attribute_packed() __attribute__((packed))
138 #define HAVE_PG_ATTRIBUTE_NORETURN 1
139 #else
140 /*
141  * NB: aligned and packed are not given default definitions because they
142  * affect code functionality; they *must* be implemented by the compiler
143  * if they are to be used.
144  */
145 #define pg_attribute_noreturn()
146 #endif
147 
148 /*
149  * Use "pg_attribute_always_inline" in place of "inline" for functions that
150  * we wish to force inlining of, even when the compiler's heuristics would
151  * choose not to. But, if possible, don't force inlining in unoptimized
152  * debug builds.
153  */
154 #if (defined(__GNUC__) && __GNUC__ > 3 && defined(__OPTIMIZE__)) || defined(__SUNPRO_C) || defined(__IBMC__)
155 /* GCC > 3, Sunpro and XLC support always_inline via __attribute__ */
156 #define pg_attribute_always_inline __attribute__((always_inline)) inline
157 #elif defined(_MSC_VER)
158 /* MSVC has a special keyword for this */
159 #define pg_attribute_always_inline __forceinline
160 #else
161 /* Otherwise, the best we can do is to say "inline" */
162 #define pg_attribute_always_inline inline
163 #endif
164 
165 /*
166  * Forcing a function not to be inlined can be useful if it's the slow path of
167  * a performance-critical function, or should be visible in profiles to allow
168  * for proper cost attribution. Note that unlike the pg_attribute_XXX macros
169  * above, this should be placed before the function's return type and name.
170  */
171 /* GCC, Sunpro and XLC support noinline via __attribute__ */
172 #if (defined(__GNUC__) && __GNUC__ > 2) || defined(__SUNPRO_C) || defined(__IBMC__)
173 #define pg_noinline __attribute__((noinline))
174 /* msvc via declspec */
175 #elif defined(_MSC_VER)
176 #define pg_noinline __declspec(noinline)
177 #else
178 #define pg_noinline
179 #endif
180 
181 /*
182  * Mark a point as unreachable in a portable fashion. This should preferably
183  * be something that the compiler understands, to aid code generation.
184  * In assert-enabled builds, we prefer abort() for debugging reasons.
185  */
186 #if defined(HAVE__BUILTIN_UNREACHABLE) && !defined(USE_ASSERT_CHECKING)
187 #define pg_unreachable() __builtin_unreachable()
188 #elif defined(_MSC_VER) && !defined(USE_ASSERT_CHECKING)
189 #define pg_unreachable() __assume(0)
190 #else
191 #define pg_unreachable() abort()
192 #endif
193 
194 /*
195  * Hints to the compiler about the likelihood of a branch. Both likely() and
196  * unlikely() return the boolean value of the contained expression.
197  *
198  * These should only be used sparingly, in very hot code paths. It's very easy
199  * to mis-estimate likelihoods.
200  */
201 #if __GNUC__ >= 3
202 #define likely(x) __builtin_expect((x) != 0, 1)
203 #define unlikely(x) __builtin_expect((x) != 0, 0)
204 #else
205 #define likely(x) ((x) != 0)
206 #define unlikely(x) ((x) != 0)
207 #endif
208 
209 /*
210  * CppAsString
211  * Convert the argument to a string, using the C preprocessor.
212  * CppAsString2
213  * Convert the argument to a string, after one round of macro expansion.
214  * CppConcat
215  * Concatenate two arguments together, using the C preprocessor.
216  *
217  * Note: There used to be support here for pre-ANSI C compilers that didn't
218  * support # and ##. Nowadays, these macros are just for clarity and/or
219  * backward compatibility with existing PostgreSQL code.
220  */
221 #define CppAsString(identifier) #identifier
222 #define CppAsString2(x) CppAsString(x)
223 #define CppConcat(x, y) x##y
224 
225 /*
226  * VA_ARGS_NARGS
227  * Returns the number of macro arguments it is passed.
228  *
229  * An empty argument still counts as an argument, so effectively, this is
230  * "one more than the number of commas in the argument list".
231  *
232  * This works for up to 63 arguments. Internally, VA_ARGS_NARGS_() is passed
233  * 64+N arguments, and the C99 standard only requires macros to allow up to
234  * 127 arguments, so we can't portably go higher. The implementation is
235  * pretty trivial: VA_ARGS_NARGS_() returns its 64th argument, and we set up
236  * the call so that that is the appropriate one of the list of constants.
237  * This idea is due to Laurent Deniau.
238  */
239 #define VA_ARGS_NARGS(...) \
240  VA_ARGS_NARGS_(__VA_ARGS__, \
241  63,62,61,60, \
242  59,58,57,56,55,54,53,52,51,50, \
243  49,48,47,46,45,44,43,42,41,40, \
244  39,38,37,36,35,34,33,32,31,30, \
245  29,28,27,26,25,24,23,22,21,20, \
246  19,18,17,16,15,14,13,12,11,10, \
247  9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
248 #define VA_ARGS_NARGS_( \
249  _01,_02,_03,_04,_05,_06,_07,_08,_09,_10, \
250  _11,_12,_13,_14,_15,_16,_17,_18,_19,_20, \
251  _21,_22,_23,_24,_25,_26,_27,_28,_29,_30, \
252  _31,_32,_33,_34,_35,_36,_37,_38,_39,_40, \
253  _41,_42,_43,_44,_45,_46,_47,_48,_49,_50, \
254  _51,_52,_53,_54,_55,_56,_57,_58,_59,_60, \
255  _61,_62,_63, N, ...) \
256  (N)
257 
258 /*
259  * dummyret is used to set return values in macros that use ?: to make
260  * assignments. gcc wants these to be void, other compilers like char
261  */
262 #ifdef __GNUC__ /* GNU cc */
263 #define dummyret void
264 #else
265 #define dummyret char
266 #endif
267 
268 /*
269  * We require C99, hence the compiler should understand flexible array
270  * members. However, for documentation purposes we still consider it to be
271  * project style to write "field[FLEXIBLE_ARRAY_MEMBER]" not just "field[]".
272  * When computing the size of such an object, use "offsetof(struct s, f)"
273  * for portability. Don't use "offsetof(struct s, f[0])", as this doesn't
274  * work with MSVC and with C++ compilers.
275  */
276 #define FLEXIBLE_ARRAY_MEMBER /* empty */
277 
278 /* Which __func__ symbol do we have, if any? */
279 #ifdef HAVE_FUNCNAME__FUNC
280 #define PG_FUNCNAME_MACRO __func__
281 #else
282 #ifdef HAVE_FUNCNAME__FUNCTION
283 #define PG_FUNCNAME_MACRO __FUNCTION__
284 #else
285 #define PG_FUNCNAME_MACRO NULL
286 #endif
287 #endif
288 
289 
290 /* ----------------------------------------------------------------
291  * Section 2: bool, true, false
292  * ----------------------------------------------------------------
293  */
294 
295 /*
296  * bool
297  * Boolean value, either true or false.
298  *
299  * We use stdbool.h if available and its bool has size 1. That's useful for
300  * better compiler and debugger output and for compatibility with third-party
301  * libraries. But PostgreSQL currently cannot deal with bool of other sizes;
302  * there are static assertions around the code to prevent that.
303  *
304  * For C++ compilers, we assume the compiler has a compatible built-in
305  * definition of bool.
306  *
307  * See also the version of this code in src/interfaces/ecpg/include/ecpglib.h.
308  */
309 
310 #ifndef __cplusplus
311 
312 #ifdef PG_USE_STDBOOL
313 #include <stdbool.h>
314 #else
315 
316 #ifndef bool
317 typedef unsigned char bool;
318 #endif
319 
320 #ifndef true
321 #define true ((bool) 1)
322 #endif
323 
324 #ifndef false
325 #define false ((bool) 0)
326 #endif
327 
328 #endif /* not PG_USE_STDBOOL */
329 #endif /* not C++ */
330 
331 
332 /* ----------------------------------------------------------------
333  * Section 3: standard system types
334  * ----------------------------------------------------------------
335  */
336 
337 /*
338  * Pointer
339  * Variable holding address of any memory resident object.
340  *
341  * XXX Pointer arithmetic is done with this, so it can't be void *
342  * under "true" ANSI compilers.
343  */
344 typedef char *Pointer;
345 
346 /*
347  * intN
348  * Signed integer, EXACTLY N BITS IN SIZE,
349  * used for numerical computations and the
350  * frontend/backend protocol.
351  */
352 #ifndef HAVE_INT8
353 typedef signed char int8; /* == 8 bits */
354 typedef signed short int16; /* == 16 bits */
355 typedef signed int int32; /* == 32 bits */
356 #endif /* not HAVE_INT8 */
357 
358 /*
359  * uintN
360  * Unsigned integer, EXACTLY N BITS IN SIZE,
361  * used for numerical computations and the
362  * frontend/backend protocol.
363  */
364 #ifndef HAVE_UINT8
365 typedef unsigned char uint8; /* == 8 bits */
366 typedef unsigned short uint16; /* == 16 bits */
367 typedef unsigned int uint32; /* == 32 bits */
368 #endif /* not HAVE_UINT8 */
369 
370 /*
371  * bitsN
372  * Unit of bitwise operation, AT LEAST N BITS IN SIZE.
373  */
374 typedef uint8 bits8; /* >= 8 bits */
375 typedef uint16 bits16; /* >= 16 bits */
376 typedef uint32 bits32; /* >= 32 bits */
377 
378 /*
379  * 64-bit integers
380  */
381 #ifdef HAVE_LONG_INT_64
382 /* Plain "long int" fits, use it */
383 
384 #ifndef HAVE_INT64
385 typedef long int int64;
386 #endif
387 #ifndef HAVE_UINT64
388 typedef unsigned long int uint64;
389 #endif
390 #define INT64CONST(x) (x##L)
391 #define UINT64CONST(x) (x##UL)
392 #elif defined(HAVE_LONG_LONG_INT_64)
393 /* We have working support for "long long int", use that */
394 
395 #ifndef HAVE_INT64
396 typedef long long int int64;
397 #endif
398 #ifndef HAVE_UINT64
399 typedef unsigned long long int uint64;
400 #endif
401 #define INT64CONST(x) (x##LL)
402 #define UINT64CONST(x) (x##ULL)
403 #else
404 /* neither HAVE_LONG_INT_64 nor HAVE_LONG_LONG_INT_64 */
405 #error must have a working 64-bit integer datatype
406 #endif
407 
408 /* snprintf format strings to use for 64-bit integers */
409 #define INT64_FORMAT "%" INT64_MODIFIER "d"
410 #define UINT64_FORMAT "%" INT64_MODIFIER "u"
411 
412 /*
413  * 128-bit signed and unsigned integers
414  * There currently is only limited support for such types.
415  * E.g. 128bit literals and snprintf are not supported; but math is.
416  * Also, because we exclude such types when choosing MAXIMUM_ALIGNOF,
417  * it must be possible to coerce the compiler to allocate them on no
418  * more than MAXALIGN boundaries.
419  */
420 #if defined(PG_INT128_TYPE)
421 #if defined(pg_attribute_aligned) || ALIGNOF_PG_INT128_TYPE <= MAXIMUM_ALIGNOF
422 #define HAVE_INT128 1
423 
424 typedef PG_INT128_TYPE int128
425 #if defined(pg_attribute_aligned)
426  pg_attribute_aligned(MAXIMUM_ALIGNOF)
427 #endif
428  ;
429 
430 typedef unsigned PG_INT128_TYPE uint128
431 #if defined(pg_attribute_aligned)
432  pg_attribute_aligned(MAXIMUM_ALIGNOF)
433 #endif
434  ;
435 
436 #endif
437 #endif
438 
439 /*
440  * stdint.h limits aren't guaranteed to have compatible types with our fixed
441  * width types. So just define our own.
442  */
443 #define PG_INT8_MIN (-0x7F-1)
444 #define PG_INT8_MAX (0x7F)
445 #define PG_UINT8_MAX (0xFF)
446 #define PG_INT16_MIN (-0x7FFF-1)
447 #define PG_INT16_MAX (0x7FFF)
448 #define PG_UINT16_MAX (0xFFFF)
449 #define PG_INT32_MIN (-0x7FFFFFFF-1)
450 #define PG_INT32_MAX (0x7FFFFFFF)
451 #define PG_UINT32_MAX (0xFFFFFFFFU)
452 #define PG_INT64_MIN (-INT64CONST(0x7FFFFFFFFFFFFFFF) - 1)
453 #define PG_INT64_MAX INT64CONST(0x7FFFFFFFFFFFFFFF)
454 #define PG_UINT64_MAX UINT64CONST(0xFFFFFFFFFFFFFFFF)
455 
456 /*
457  * We now always use int64 timestamps, but keep this symbol defined for the
458  * benefit of external code that might test it.
459  */
460 #define HAVE_INT64_TIMESTAMP
461 
462 /*
463  * Size
464  * Size of any memory resident object, as returned by sizeof.
465  */
466 typedef size_t Size;
467 
468 /*
469  * Index
470  * Index into any memory resident array.
471  *
472  * Note:
473  * Indices are non negative.
474  */
475 typedef unsigned int Index;
476 
477 /*
478  * Offset
479  * Offset into any memory resident array.
480  *
481  * Note:
482  * This differs from an Index in that an Index is always
483  * non negative, whereas Offset may be negative.
484  */
485 typedef signed int Offset;
486 
487 /*
488  * Common Postgres datatype names (as used in the catalogs)
489  */
490 typedef float float4;
491 typedef double float8;
492 
493 #ifdef USE_FLOAT8_BYVAL
494 #define FLOAT8PASSBYVAL true
495 #else
496 #define FLOAT8PASSBYVAL false
497 #endif
498 
499 /*
500  * Oid, RegProcedure, TransactionId, SubTransactionId, MultiXactId,
501  * CommandId
502  */
503 
504 /* typedef Oid is in postgres_ext.h */
505 
506 /*
507  * regproc is the type name used in the include/catalog headers, but
508  * RegProcedure is the preferred name in C code.
509  */
510 typedef Oid regproc;
511 typedef regproc RegProcedure;
512 
514 
516 
518 
519 #define InvalidSubTransactionId ((SubTransactionId) 0)
520 #define TopSubTransactionId ((SubTransactionId) 1)
521 
522 /* MultiXactId must be equivalent to TransactionId, to fit in t_xmax */
523 typedef TransactionId MultiXactId;
524 
526 
528 
529 #define FirstCommandId ((CommandId) 0)
530 #define InvalidCommandId (~(CommandId)0)
531 
532 /*
533  * Array indexing support
534  */
535 #define MAXDIM 6
536 typedef struct
537 {
538  int indx[MAXDIM];
539 } IntArray;
540 
541 /* ----------------
542  * Variable-length datatypes all share the 'struct varlena' header.
543  *
544  * NOTE: for TOASTable types, this is an oversimplification, since the value
545  * may be compressed or moved out-of-line. However datatype-specific routines
546  * are mostly content to deal with de-TOASTed values only, and of course
547  * client-side routines should never see a TOASTed value. But even in a
548  * de-TOASTed value, beware of touching vl_len_ directly, as its
549  * representation is no longer convenient. It's recommended that code always
550  * use macros VARDATA_ANY, VARSIZE_ANY, VARSIZE_ANY_EXHDR, VARDATA, VARSIZE,
551  * and SET_VARSIZE instead of relying on direct mentions of the struct fields.
552  * See postgres.h for details of the TOASTed form.
553  * ----------------
554  */
555 struct varlena
556 {
557  char vl_len_[4]; /* Do not touch this field directly! */
558  char vl_dat[FLEXIBLE_ARRAY_MEMBER]; /* Data content is here */
559 };
560 
561 #define VARHDRSZ ((int32) sizeof(int32))
562 
563 /*
564  * These widely-used datatypes are just a varlena header and the data bytes.
565  * There is no terminating null or anything like that --- the data length is
566  * always VARSIZE_ANY_EXHDR(ptr).
567  */
568 typedef struct varlena bytea;
569 typedef struct varlena text;
570 typedef struct varlena BpChar; /* blank-padded char, ie SQL char(n) */
571 typedef struct varlena VarChar; /* var-length char, ie SQL varchar(n) */
572 
573 /*
574  * Specialized array types. These are physically laid out just the same
575  * as regular arrays (so that the regular array subscripting code works
576  * with them). They exist as distinct types mostly for historical reasons:
577  * they have nonstandard I/O behavior which we don't want to change for fear
578  * of breaking applications that look at the system catalogs. There is also
579  * an implementation issue for oidvector: it's part of the primary key for
580  * pg_proc, and we can't use the normal btree array support routines for that
581  * without circularity.
582  */
583 typedef struct
584 {
585  int32 vl_len_; /* these fields must match ArrayType! */
586  int ndim; /* always 1 for int2vector */
587  int32 dataoffset; /* always 0 for int2vector */
589  int dim1;
590  int lbound1;
592 } int2vector;
593 
594 typedef struct
595 {
596  int32 vl_len_; /* these fields must match ArrayType! */
597  int ndim; /* always 1 for oidvector */
598  int32 dataoffset; /* always 0 for oidvector */
600  int dim1;
601  int lbound1;
603 } oidvector;
604 
605 /*
606  * Representation of a Name: effectively just a C string, but null-padded to
607  * exactly NAMEDATALEN bytes. The use of a struct is historical.
608  */
609 typedef struct nameData
610 {
611  char data[NAMEDATALEN];
612 } NameData;
613 typedef NameData *Name;
614 
615 #define NameStr(name) ((name).data)
616 
617 
618 /* ----------------------------------------------------------------
619  * Section 4: IsValid macros for system types
620  * ----------------------------------------------------------------
621  */
622 /*
623  * BoolIsValid
624  * True iff bool is valid.
625  */
626 #define BoolIsValid(boolean) ((boolean) == false || (boolean) == true)
627 
628 /*
629  * PointerIsValid
630  * True iff pointer is valid.
631  */
632 #define PointerIsValid(pointer) ((const void*)(pointer) != NULL)
633 
634 /*
635  * PointerIsAligned
636  * True iff pointer is properly aligned to point to the given type.
637  */
638 #define PointerIsAligned(pointer, type) \
639  (((uintptr_t)(pointer) % (sizeof (type))) == 0)
640 
641 #define OffsetToPointer(base, offset) \
642  ((void *)((char *) base + offset))
643 
644 #define OidIsValid(objectId) ((bool) ((objectId) != InvalidOid))
645 
646 #define RegProcedureIsValid(p) OidIsValid(p)
647 
648 
649 /* ----------------------------------------------------------------
650  * Section 5: offsetof, lengthof, alignment
651  * ----------------------------------------------------------------
652  */
653 /*
654  * offsetof
655  * Offset of a structure/union field within that structure/union.
656  *
657  * XXX This is supposed to be part of stddef.h, but isn't on
658  * some systems (like SunOS 4).
659  */
660 #ifndef offsetof
661 #define offsetof(type, field) ((long) &((type *)0)->field)
662 #endif /* offsetof */
663 
664 /*
665  * lengthof
666  * Number of elements in an array.
667  */
668 #define lengthof(array) (sizeof (array) / sizeof ((array)[0]))
669 
670 /* ----------------
671  * Alignment macros: align a length or address appropriately for a given type.
672  * The fooALIGN() macros round up to a multiple of the required alignment,
673  * while the fooALIGN_DOWN() macros round down. The latter are more useful
674  * for problems like "how many X-sized structures will fit in a page?".
675  *
676  * NOTE: TYPEALIGN[_DOWN] will not work if ALIGNVAL is not a power of 2.
677  * That case seems extremely unlikely to be needed in practice, however.
678  *
679  * NOTE: MAXIMUM_ALIGNOF, and hence MAXALIGN(), intentionally exclude any
680  * larger-than-8-byte types the compiler might have.
681  * ----------------
682  */
683 
684 #define TYPEALIGN(ALIGNVAL,LEN) \
685  (((uintptr_t) (LEN) + ((ALIGNVAL) - 1)) & ~((uintptr_t) ((ALIGNVAL) - 1)))
686 
687 #define SHORTALIGN(LEN) TYPEALIGN(ALIGNOF_SHORT, (LEN))
688 #define INTALIGN(LEN) TYPEALIGN(ALIGNOF_INT, (LEN))
689 #define LONGALIGN(LEN) TYPEALIGN(ALIGNOF_LONG, (LEN))
690 #define DOUBLEALIGN(LEN) TYPEALIGN(ALIGNOF_DOUBLE, (LEN))
691 #define MAXALIGN(LEN) TYPEALIGN(MAXIMUM_ALIGNOF, (LEN))
692 /* MAXALIGN covers only built-in types, not buffers */
693 #define BUFFERALIGN(LEN) TYPEALIGN(ALIGNOF_BUFFER, (LEN))
694 #define CACHELINEALIGN(LEN) TYPEALIGN(PG_CACHE_LINE_SIZE, (LEN))
695 
696 #define TYPEALIGN_DOWN(ALIGNVAL,LEN) \
697  (((uintptr_t) (LEN)) & ~((uintptr_t) ((ALIGNVAL) - 1)))
698 
699 #define SHORTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_SHORT, (LEN))
700 #define INTALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_INT, (LEN))
701 #define LONGALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_LONG, (LEN))
702 #define DOUBLEALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_DOUBLE, (LEN))
703 #define MAXALIGN_DOWN(LEN) TYPEALIGN_DOWN(MAXIMUM_ALIGNOF, (LEN))
704 #define BUFFERALIGN_DOWN(LEN) TYPEALIGN_DOWN(ALIGNOF_BUFFER, (LEN))
705 
706 /*
707  * The above macros will not work with types wider than uintptr_t, like with
708  * uint64 on 32-bit platforms. That's not problem for the usual use where a
709  * pointer or a length is aligned, but for the odd case that you need to
710  * align something (potentially) wider, use TYPEALIGN64.
711  */
712 #define TYPEALIGN64(ALIGNVAL,LEN) \
713  (((uint64) (LEN) + ((ALIGNVAL) - 1)) & ~((uint64) ((ALIGNVAL) - 1)))
714 
715 /* we don't currently need wider versions of the other ALIGN macros */
716 #define MAXALIGN64(LEN) TYPEALIGN64(MAXIMUM_ALIGNOF, (LEN))
717 
718 
719 /* ----------------------------------------------------------------
720  * Section 6: assertions
721  * ----------------------------------------------------------------
722  */
723 
724 /*
725  * USE_ASSERT_CHECKING, if defined, turns on all the assertions.
726  * - plai 9/5/90
727  *
728  * It should _NOT_ be defined in releases or in benchmark copies
729  */
730 
731 /*
732  * Assert() can be used in both frontend and backend code. In frontend code it
733  * just calls the standard assert, if it's available. If use of assertions is
734  * not configured, it does nothing.
735  */
736 #ifndef USE_ASSERT_CHECKING
737 
738 #define Assert(condition) ((void)true)
739 #define AssertMacro(condition) ((void)true)
740 #define AssertArg(condition) ((void)true)
741 #define AssertState(condition) ((void)true)
742 #define AssertPointerAlignment(ptr, bndr) ((void)true)
743 #define Trap(condition, errorType) ((void)true)
744 #define TrapMacro(condition, errorType) (true)
745 
746 #elif defined(FRONTEND)
747 
748 #include <assert.h>
749 #define Assert(p) assert(p)
750 #define AssertMacro(p) ((void) assert(p))
751 #define AssertArg(condition) assert(condition)
752 #define AssertState(condition) assert(condition)
753 #define AssertPointerAlignment(ptr, bndr) ((void)true)
754 
755 #else /* USE_ASSERT_CHECKING && !FRONTEND */
756 
757 /*
758  * Trap
759  * Generates an exception if the given condition is true.
760  */
761 #define Trap(condition, errorType) \
762  do { \
763  if (condition) \
764  ExceptionalCondition(#condition, (errorType), \
765  __FILE__, __LINE__); \
766  } while (0)
767 
768 /*
769  * TrapMacro is the same as Trap but it's intended for use in macros:
770  *
771  * #define foo(x) (AssertMacro(x != 0), bar(x))
772  *
773  * Isn't CPP fun?
774  */
775 #define TrapMacro(condition, errorType) \
776  ((bool) (! (condition) || \
777  (ExceptionalCondition(#condition, (errorType), \
778  __FILE__, __LINE__), 0)))
779 
780 #define Assert(condition) \
781  do { \
782  if (!(condition)) \
783  ExceptionalCondition(#condition, "FailedAssertion", \
784  __FILE__, __LINE__); \
785  } while (0)
786 
787 #define AssertMacro(condition) \
788  ((void) ((condition) || \
789  (ExceptionalCondition(#condition, "FailedAssertion", \
790  __FILE__, __LINE__), 0)))
791 
792 #define AssertArg(condition) \
793  do { \
794  if (!(condition)) \
795  ExceptionalCondition(#condition, "BadArgument", \
796  __FILE__, __LINE__); \
797  } while (0)
798 
799 #define AssertState(condition) \
800  do { \
801  if (!(condition)) \
802  ExceptionalCondition(#condition, "BadState", \
803  __FILE__, __LINE__); \
804  } while (0)
805 
806 /*
807  * Check that `ptr' is `bndr' aligned.
808  */
809 #define AssertPointerAlignment(ptr, bndr) \
810  Trap(TYPEALIGN(bndr, (uintptr_t)(ptr)) != (uintptr_t)(ptr), \
811  "UnalignedPointer")
812 
813 #endif /* USE_ASSERT_CHECKING && !FRONTEND */
814 
815 /*
816  * ExceptionalCondition is compiled into the backend whether or not
817  * USE_ASSERT_CHECKING is defined, so as to support use of extensions
818  * that are built with that #define with a backend that isn't. Hence,
819  * we should declare it as long as !FRONTEND.
820  */
821 #ifndef FRONTEND
822 extern void ExceptionalCondition(const char *conditionName,
823  const char *errorType,
824  const char *fileName, int lineNumber) pg_attribute_noreturn();
825 #endif
826 
827 /*
828  * Macros to support compile-time assertion checks.
829  *
830  * If the "condition" (a compile-time-constant expression) evaluates to false,
831  * throw a compile error using the "errmessage" (a string literal).
832  *
833  * gcc 4.6 and up supports _Static_assert(), but there are bizarre syntactic
834  * placement restrictions. Macros StaticAssertStmt() and StaticAssertExpr()
835  * make it safe to use as a statement or in an expression, respectively.
836  * The macro StaticAssertDecl() is suitable for use at file scope (outside of
837  * any function).
838  *
839  * Otherwise we fall back on a kluge that assumes the compiler will complain
840  * about a negative width for a struct bit-field. This will not include a
841  * helpful error message, but it beats not getting an error at all.
842  */
843 #ifndef __cplusplus
844 #ifdef HAVE__STATIC_ASSERT
845 #define StaticAssertStmt(condition, errmessage) \
846  do { _Static_assert(condition, errmessage); } while(0)
847 #define StaticAssertExpr(condition, errmessage) \
848  ((void) ({ StaticAssertStmt(condition, errmessage); true; }))
849 #define StaticAssertDecl(condition, errmessage) \
850  _Static_assert(condition, errmessage)
851 #else /* !HAVE__STATIC_ASSERT */
852 #define StaticAssertStmt(condition, errmessage) \
853  ((void) sizeof(struct { int static_assert_failure : (condition) ? 1 : -1; }))
854 #define StaticAssertExpr(condition, errmessage) \
855  StaticAssertStmt(condition, errmessage)
856 #define StaticAssertDecl(condition, errmessage) \
857  extern void static_assert_func(int static_assert_failure[(condition) ? 1 : -1])
858 #endif /* HAVE__STATIC_ASSERT */
859 #else /* C++ */
860 #if defined(__cpp_static_assert) && __cpp_static_assert >= 200410
861 #define StaticAssertStmt(condition, errmessage) \
862  static_assert(condition, errmessage)
863 #define StaticAssertExpr(condition, errmessage) \
864  ({ static_assert(condition, errmessage); })
865 #define StaticAssertDecl(condition, errmessage) \
866  static_assert(condition, errmessage)
867 #else /* !__cpp_static_assert */
868 #define StaticAssertStmt(condition, errmessage) \
869  do { struct static_assert_struct { int static_assert_failure : (condition) ? 1 : -1; }; } while(0)
870 #define StaticAssertExpr(condition, errmessage) \
871  ((void) ({ StaticAssertStmt(condition, errmessage); }))
872 #define StaticAssertDecl(condition, errmessage) \
873  extern void static_assert_func(int static_assert_failure[(condition) ? 1 : -1])
874 #endif /* __cpp_static_assert */
875 #endif /* C++ */
876 
877 
878 /*
879  * Compile-time checks that a variable (or expression) has the specified type.
880  *
881  * AssertVariableIsOfType() can be used as a statement.
882  * AssertVariableIsOfTypeMacro() is intended for use in macros, eg
883  * #define foo(x) (AssertVariableIsOfTypeMacro(x, int), bar(x))
884  *
885  * If we don't have __builtin_types_compatible_p, we can still assert that
886  * the types have the same size. This is far from ideal (especially on 32-bit
887  * platforms) but it provides at least some coverage.
888  */
889 #ifdef HAVE__BUILTIN_TYPES_COMPATIBLE_P
890 #define AssertVariableIsOfType(varname, typename) \
891  StaticAssertStmt(__builtin_types_compatible_p(__typeof__(varname), typename), \
892  CppAsString(varname) " does not have type " CppAsString(typename))
893 #define AssertVariableIsOfTypeMacro(varname, typename) \
894  (StaticAssertExpr(__builtin_types_compatible_p(__typeof__(varname), typename), \
895  CppAsString(varname) " does not have type " CppAsString(typename)))
896 #else /* !HAVE__BUILTIN_TYPES_COMPATIBLE_P */
897 #define AssertVariableIsOfType(varname, typename) \
898  StaticAssertStmt(sizeof(varname) == sizeof(typename), \
899  CppAsString(varname) " does not have type " CppAsString(typename))
900 #define AssertVariableIsOfTypeMacro(varname, typename) \
901  (StaticAssertExpr(sizeof(varname) == sizeof(typename), \
902  CppAsString(varname) " does not have type " CppAsString(typename)))
903 #endif /* HAVE__BUILTIN_TYPES_COMPATIBLE_P */
904 
905 
906 /* ----------------------------------------------------------------
907  * Section 7: widely useful macros
908  * ----------------------------------------------------------------
909  */
910 /*
911  * Max
912  * Return the maximum of two numbers.
913  */
914 #define Max(x, y) ((x) > (y) ? (x) : (y))
915 
916 /*
917  * Min
918  * Return the minimum of two numbers.
919  */
920 #define Min(x, y) ((x) < (y) ? (x) : (y))
921 
922 /*
923  * Abs
924  * Return the absolute value of the argument.
925  */
926 #define Abs(x) ((x) >= 0 ? (x) : -(x))
927 
928 /*
929  * StrNCpy
930  * Like standard library function strncpy(), except that result string
931  * is guaranteed to be null-terminated --- that is, at most N-1 bytes
932  * of the source string will be kept.
933  * Also, the macro returns no result (too hard to do that without
934  * evaluating the arguments multiple times, which seems worse).
935  *
936  * BTW: when you need to copy a non-null-terminated string (like a text
937  * datum) and add a null, do not do it with StrNCpy(..., len+1). That
938  * might seem to work, but it fetches one byte more than there is in the
939  * text object. One fine day you'll have a SIGSEGV because there isn't
940  * another byte before the end of memory. Don't laugh, we've had real
941  * live bug reports from real live users over exactly this mistake.
942  * Do it honestly with "memcpy(dst,src,len); dst[len] = '\0';", instead.
943  */
944 #define StrNCpy(dst,src,len) \
945  do \
946  { \
947  char * _dst = (dst); \
948  Size _len = (len); \
949 \
950  if (_len > 0) \
951  { \
952  strncpy(_dst, (src), _len); \
953  _dst[_len-1] = '\0'; \
954  } \
955  } while (0)
956 
957 
958 /* Get a bit mask of the bits set in non-long aligned addresses */
959 #define LONG_ALIGN_MASK (sizeof(long) - 1)
960 
961 /*
962  * MemSet
963  * Exactly the same as standard library function memset(), but considerably
964  * faster for zeroing small word-aligned structures (such as parsetree nodes).
965  * This has to be a macro because the main point is to avoid function-call
966  * overhead. However, we have also found that the loop is faster than
967  * native libc memset() on some platforms, even those with assembler
968  * memset() functions. More research needs to be done, perhaps with
969  * MEMSET_LOOP_LIMIT tests in configure.
970  */
971 #define MemSet(start, val, len) \
972  do \
973  { \
974  /* must be void* because we don't know if it is integer aligned yet */ \
975  void *_vstart = (void *) (start); \
976  int _val = (val); \
977  Size _len = (len); \
978 \
979  if ((((uintptr_t) _vstart) & LONG_ALIGN_MASK) == 0 && \
980  (_len & LONG_ALIGN_MASK) == 0 && \
981  _val == 0 && \
982  _len <= MEMSET_LOOP_LIMIT && \
983  /* \
984  * If MEMSET_LOOP_LIMIT == 0, optimizer should find \
985  * the whole "if" false at compile time. \
986  */ \
987  MEMSET_LOOP_LIMIT != 0) \
988  { \
989  long *_start = (long *) _vstart; \
990  long *_stop = (long *) ((char *) _start + _len); \
991  while (_start < _stop) \
992  *_start++ = 0; \
993  } \
994  else \
995  memset(_vstart, _val, _len); \
996  } while (0)
997 
998 /*
999  * MemSetAligned is the same as MemSet except it omits the test to see if
1000  * "start" is word-aligned. This is okay to use if the caller knows a-priori
1001  * that the pointer is suitably aligned (typically, because he just got it
1002  * from palloc(), which always delivers a max-aligned pointer).
1003  */
1004 #define MemSetAligned(start, val, len) \
1005  do \
1006  { \
1007  long *_start = (long *) (start); \
1008  int _val = (val); \
1009  Size _len = (len); \
1010 \
1011  if ((_len & LONG_ALIGN_MASK) == 0 && \
1012  _val == 0 && \
1013  _len <= MEMSET_LOOP_LIMIT && \
1014  MEMSET_LOOP_LIMIT != 0) \
1015  { \
1016  long *_stop = (long *) ((char *) _start + _len); \
1017  while (_start < _stop) \
1018  *_start++ = 0; \
1019  } \
1020  else \
1021  memset(_start, _val, _len); \
1022  } while (0)
1023 
1024 
1025 /*
1026  * MemSetTest/MemSetLoop are a variant version that allow all the tests in
1027  * MemSet to be done at compile time in cases where "val" and "len" are
1028  * constants *and* we know the "start" pointer must be word-aligned.
1029  * If MemSetTest succeeds, then it is okay to use MemSetLoop, otherwise use
1030  * MemSetAligned. Beware of multiple evaluations of the arguments when using
1031  * this approach.
1032  */
1033 #define MemSetTest(val, len) \
1034  ( ((len) & LONG_ALIGN_MASK) == 0 && \
1035  (len) <= MEMSET_LOOP_LIMIT && \
1036  MEMSET_LOOP_LIMIT != 0 && \
1037  (val) == 0 )
1038 
1039 #define MemSetLoop(start, val, len) \
1040  do \
1041  { \
1042  long * _start = (long *) (start); \
1043  long * _stop = (long *) ((char *) _start + (Size) (len)); \
1044  \
1045  while (_start < _stop) \
1046  *_start++ = 0; \
1047  } while (0)
1048 
1049 /*
1050  * Macros for range-checking float values before converting to integer.
1051  * We must be careful here that the boundary values are expressed exactly
1052  * in the float domain. PG_INTnn_MIN is an exact power of 2, so it will
1053  * be represented exactly; but PG_INTnn_MAX isn't, and might get rounded
1054  * off, so avoid using that.
1055  * The input must be rounded to an integer beforehand, typically with rint(),
1056  * else we might draw the wrong conclusion about close-to-the-limit values.
1057  * These macros will do the right thing for Inf, but not necessarily for NaN,
1058  * so check isnan(num) first if that's a possibility.
1059  */
1060 #define FLOAT4_FITS_IN_INT16(num) \
1061  ((num) >= (float4) PG_INT16_MIN && (num) < -((float4) PG_INT16_MIN))
1062 #define FLOAT4_FITS_IN_INT32(num) \
1063  ((num) >= (float4) PG_INT32_MIN && (num) < -((float4) PG_INT32_MIN))
1064 #define FLOAT4_FITS_IN_INT64(num) \
1065  ((num) >= (float4) PG_INT64_MIN && (num) < -((float4) PG_INT64_MIN))
1066 #define FLOAT8_FITS_IN_INT16(num) \
1067  ((num) >= (float8) PG_INT16_MIN && (num) < -((float8) PG_INT16_MIN))
1068 #define FLOAT8_FITS_IN_INT32(num) \
1069  ((num) >= (float8) PG_INT32_MIN && (num) < -((float8) PG_INT32_MIN))
1070 #define FLOAT8_FITS_IN_INT64(num) \
1071  ((num) >= (float8) PG_INT64_MIN && (num) < -((float8) PG_INT64_MIN))
1072 
1073 
1074 /* ----------------------------------------------------------------
1075  * Section 8: random stuff
1076  * ----------------------------------------------------------------
1077  */
1078 
1079 #ifdef HAVE_STRUCT_SOCKADDR_UN
1080 #define HAVE_UNIX_SOCKETS 1
1081 #endif
1082 
1083 /*
1084  * Invert the sign of a qsort-style comparison result, ie, exchange negative
1085  * and positive integer values, being careful not to get the wrong answer
1086  * for INT_MIN. The argument should be an integral variable.
1087  */
1088 #define INVERT_COMPARE_RESULT(var) \
1089  ((var) = ((var) < 0) ? 1 : -(var))
1090 
1091 /*
1092  * Use this, not "char buf[BLCKSZ]", to declare a field or local variable
1093  * holding a page buffer, if that page might be accessed as a page and not
1094  * just a string of bytes. Otherwise the variable might be under-aligned,
1095  * causing problems on alignment-picky hardware. (In some places, we use
1096  * this to declare buffers even though we only pass them to read() and
1097  * write(), because copying to/from aligned buffers is usually faster than
1098  * using unaligned buffers.) We include both "double" and "int64" in the
1099  * union to ensure that the compiler knows the value must be MAXALIGN'ed
1100  * (cf. configure's computation of MAXIMUM_ALIGNOF).
1101  */
1102 typedef union PGAlignedBlock
1103 {
1104  char data[BLCKSZ];
1107 } PGAlignedBlock;
1108 
1109 /* Same, but for an XLOG_BLCKSZ-sized buffer */
1110 typedef union PGAlignedXLogBlock
1111 {
1112  char data[XLOG_BLCKSZ];
1116 
1117 /* msb for char */
1118 #define HIGHBIT (0x80)
1119 #define IS_HIGHBIT_SET(ch) ((unsigned char)(ch) & HIGHBIT)
1120 
1121 /*
1122  * Support macros for escaping strings. escape_backslash should be true
1123  * if generating a non-standard-conforming string. Prefixing a string
1124  * with ESCAPE_STRING_SYNTAX guarantees it is non-standard-conforming.
1125  * Beware of multiple evaluation of the "ch" argument!
1126  */
1127 #define SQL_STR_DOUBLE(ch, escape_backslash) \
1128  ((ch) == '\'' || ((ch) == '\\' && (escape_backslash)))
1129 
1130 #define ESCAPE_STRING_SYNTAX 'E'
1131 
1132 
1133 #define STATUS_OK (0)
1134 #define STATUS_ERROR (-1)
1135 #define STATUS_EOF (-2)
1136 
1137 /*
1138  * gettext support
1139  */
1140 
1141 #ifndef ENABLE_NLS
1142 /* stuff we'd otherwise get from <libintl.h> */
1143 #define gettext(x) (x)
1144 #define dgettext(d,x) (x)
1145 #define ngettext(s,p,n) ((n) == 1 ? (s) : (p))
1146 #define dngettext(d,s,p,n) ((n) == 1 ? (s) : (p))
1147 #endif
1148 
1149 #define _(x) gettext(x)
1150 
1151 /*
1152  * Use this to mark string constants as needing translation at some later
1153  * time, rather than immediately. This is useful for cases where you need
1154  * access to the original string and translated string, and for cases where
1155  * immediate translation is not possible, like when initializing global
1156  * variables.
1157  * http://www.gnu.org/software/autoconf/manual/gettext/Special-cases.html
1158  */
1159 #define gettext_noop(x) (x)
1160 
1161 /*
1162  * To better support parallel installations of major PostgreSQL
1163  * versions as well as parallel installations of major library soname
1164  * versions, we mangle the gettext domain name by appending those
1165  * version numbers. The coding rule ought to be that wherever the
1166  * domain name is mentioned as a literal, it must be wrapped into
1167  * PG_TEXTDOMAIN(). The macros below do not work on non-literals; but
1168  * that is somewhat intentional because it avoids having to worry
1169  * about multiple states of premangling and postmangling as the values
1170  * are being passed around.
1171  *
1172  * Make sure this matches the installation rules in nls-global.mk.
1173  */
1174 #ifdef SO_MAJOR_VERSION
1175 #define PG_TEXTDOMAIN(domain) (domain CppAsString2(SO_MAJOR_VERSION) "-" PG_MAJORVERSION)
1176 #else
1177 #define PG_TEXTDOMAIN(domain) (domain "-" PG_MAJORVERSION)
1178 #endif
1179 
1180 /*
1181  * Macro that allows to cast constness and volatile away from an expression, but doesn't
1182  * allow changing the underlying type. Enforcement of the latter
1183  * currently only works for gcc like compilers.
1184  *
1185  * Please note IT IS NOT SAFE to cast constness away if the result will ever
1186  * be modified (it would be undefined behaviour). Doing so anyway can cause
1187  * compiler misoptimizations or runtime crashes (modifying readonly memory).
1188  * It is only safe to use when the result will not be modified, but API
1189  * design or language restrictions prevent you from declaring that
1190  * (e.g. because a function returns both const and non-const variables).
1191  *
1192  * Note that this only works in function scope, not for global variables (it'd
1193  * be nice, but not trivial, to improve that).
1194  */
1195 #if defined(HAVE__BUILTIN_TYPES_COMPATIBLE_P)
1196 #define unconstify(underlying_type, expr) \
1197  (StaticAssertExpr(__builtin_types_compatible_p(__typeof(expr), const underlying_type), \
1198  "wrong cast"), \
1199  (underlying_type) (expr))
1200 #define unvolatize(underlying_type, expr) \
1201  (StaticAssertExpr(__builtin_types_compatible_p(__typeof(expr), volatile underlying_type), \
1202  "wrong cast"), \
1203  (underlying_type) (expr))
1204 #else
1205 #define unconstify(underlying_type, expr) \
1206  ((underlying_type) (expr))
1207 #define unvolatize(underlying_type, expr) \
1208  ((underlying_type) (expr))
1209 #endif
1210 
1211 /* ----------------------------------------------------------------
1212  * Section 9: system-specific hacks
1213  *
1214  * This should be limited to things that absolutely have to be
1215  * included in every source file. The port-specific header file
1216  * is usually a better place for this sort of thing.
1217  * ----------------------------------------------------------------
1218  */
1219 
1220 /*
1221  * NOTE: this is also used for opening text files.
1222  * WIN32 treats Control-Z as EOF in files opened in text mode.
1223  * Therefore, we open files in binary mode on Win32 so we can read
1224  * literal control-Z. The other affect is that we see CRLF, but
1225  * that is OK because we can already handle those cleanly.
1226  */
1227 #if defined(WIN32) || defined(__CYGWIN__)
1228 #define PG_BINARY O_BINARY
1229 #define PG_BINARY_A "ab"
1230 #define PG_BINARY_R "rb"
1231 #define PG_BINARY_W "wb"
1232 #else
1233 #define PG_BINARY 0
1234 #define PG_BINARY_A "a"
1235 #define PG_BINARY_R "r"
1236 #define PG_BINARY_W "w"
1237 #endif
1238 
1239 /*
1240  * Provide prototypes for routines not present in a particular machine's
1241  * standard C library.
1242  */
1243 
1244 #if defined(HAVE_FDATASYNC) && !HAVE_DECL_FDATASYNC
1245 extern int fdatasync(int fildes);
1246 #endif
1247 
1248 /* Older platforms may provide strto[u]ll functionality under other names */
1249 #if !defined(HAVE_STRTOLL) && defined(HAVE___STRTOLL)
1250 #define strtoll __strtoll
1251 #define HAVE_STRTOLL 1
1252 #endif
1253 
1254 #if !defined(HAVE_STRTOLL) && defined(HAVE_STRTOQ)
1255 #define strtoll strtoq
1256 #define HAVE_STRTOLL 1
1257 #endif
1258 
1259 #if !defined(HAVE_STRTOULL) && defined(HAVE___STRTOULL)
1260 #define strtoull __strtoull
1261 #define HAVE_STRTOULL 1
1262 #endif
1263 
1264 #if !defined(HAVE_STRTOULL) && defined(HAVE_STRTOUQ)
1265 #define strtoull strtouq
1266 #define HAVE_STRTOULL 1
1267 #endif
1268 
1269 #if defined(HAVE_STRTOLL) && !HAVE_DECL_STRTOLL
1270 extern long long strtoll(const char *str, char **endptr, int base);
1271 #endif
1272 
1273 #if defined(HAVE_STRTOULL) && !HAVE_DECL_STRTOULL
1274 extern unsigned long long strtoull(const char *str, char **endptr, int base);
1275 #endif
1276 
1277 /* no special DLL markers on most ports */
1278 #ifndef PGDLLIMPORT
1279 #define PGDLLIMPORT
1280 #endif
1281 #ifndef PGDLLEXPORT
1282 #define PGDLLEXPORT
1283 #endif
1284 
1285 /*
1286  * The following is used as the arg list for signal handlers. Any ports
1287  * that take something other than an int argument should override this in
1288  * their pg_config_os.h file. Note that variable names are required
1289  * because it is used in both the prototypes as well as the definitions.
1290  * Note also the long name. We expect that this won't collide with
1291  * other names causing compiler warnings.
1292  */
1293 
1294 #ifndef SIGNAL_ARGS
1295 #define SIGNAL_ARGS int postgres_signal_arg
1296 #endif
1297 
1298 /*
1299  * When there is no sigsetjmp, its functionality is provided by plain
1300  * setjmp. Incidentally, nothing provides setjmp's functionality in
1301  * that case. We now support the case only on Windows.
1302  */
1303 #ifdef WIN32
1304 #define sigjmp_buf jmp_buf
1305 #define sigsetjmp(x,y) setjmp(x)
1306 #define siglongjmp longjmp
1307 #endif
1308 
1309 /* EXEC_BACKEND defines */
1310 #ifdef EXEC_BACKEND
1311 #define NON_EXEC_STATIC
1312 #else
1313 #define NON_EXEC_STATIC static
1314 #endif
1315 
1316 /* /port compatibility functions */
1317 #include "port.h"
1318 
1319 #endif /* C_H */
signed short int16
Definition: c.h:354
uint32 CommandId
Definition: c.h:527
int lbound1
Definition: c.h:590
Definition: c.h:594
#define pg_attribute_noreturn()
Definition: c.h:145
uint32 MultiXactOffset
Definition: c.h:525
uint32 TransactionId
Definition: c.h:513
#define MAXDIM
Definition: c.h:535
uint16 bits16
Definition: c.h:375
regproc RegProcedure
Definition: c.h:511
int64 force_align_i64
Definition: c.h:1114
unsigned char uint8
Definition: c.h:365
#define FLEXIBLE_ARRAY_MEMBER
Definition: c.h:276
int32 dataoffset
Definition: c.h:598
Oid elemtype
Definition: c.h:588
uint32 SubTransactionId
Definition: c.h:517
unsigned int Oid
Definition: postgres_ext.h:31
signed int int32
Definition: c.h:355
char vl_len_[4]
Definition: c.h:557
#define NAMEDATALEN
unsigned short uint16
Definition: c.h:366
char * Pointer
Definition: c.h:344
int32 dataoffset
Definition: c.h:587
double float8
Definition: c.h:491
union PGAlignedXLogBlock PGAlignedXLogBlock
union PGAlignedBlock PGAlignedBlock
double force_align_d
Definition: c.h:1113
int32 vl_len_
Definition: c.h:596
Definition: c.h:609
int dim1
Definition: c.h:600
int ndim
Definition: c.h:586
unsigned int uint32
Definition: c.h:367
uint32 LocalTransactionId
Definition: c.h:515
char vl_dat[FLEXIBLE_ARRAY_MEMBER]
Definition: c.h:558
signed char int8
Definition: c.h:353
float float4
Definition: c.h:490
uint8 bits8
Definition: c.h:374
Definition: c.h:583
int dim1
Definition: c.h:589
unsigned int Index
Definition: c.h:475
TransactionId MultiXactId
Definition: c.h:523
uint32 bits32
Definition: c.h:376
int32 vl_len_
Definition: c.h:585
signed int Offset
Definition: c.h:485
size_t Size
Definition: c.h:466
int lbound1
Definition: c.h:601
int64 force_align_i64
Definition: c.h:1106
Oid regproc
Definition: c.h:510
static Datum values[MAXATTR]
Definition: bootstrap.c:167
Definition: c.h:536
Oid elemtype
Definition: c.h:599
double force_align_d
Definition: c.h:1105
struct nameData NameData
Definition: c.h:555
NameData * Name
Definition: c.h:613
int ndim
Definition: c.h:597
void ExceptionalCondition(const char *conditionName, const char *errorType, const char *fileName, int lineNumber) pg_attribute_noreturn()
Definition: assert.c:29
unsigned char bool
Definition: c.h:317