Annotation of sys/sys/cdefs.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: cdefs.h,v 1.25 2007/06/26 10:30:05 tom Exp $ */
2: /* $NetBSD: cdefs.h,v 1.16 1996/04/03 20:46:39 christos Exp $ */
3:
4: /*
5: * Copyright (c) 1991, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Berkeley Software Design, Inc.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
35: * @(#)cdefs.h 8.7 (Berkeley) 1/21/94
36: */
37:
38: #ifndef _SYS_CDEFS_H_
39: #define _SYS_CDEFS_H_
40:
41: #include <machine/cdefs.h>
42:
43: #if defined(__cplusplus)
44: #define __BEGIN_DECLS extern "C" {
45: #define __END_DECLS }
46: #else
47: #define __BEGIN_DECLS
48: #define __END_DECLS
49: #endif
50:
51: /*
52: * Macro to test if we're using a specific version of gcc or later.
53: */
54: #ifdef __GNUC__
55: #define __GNUC_PREREQ__(ma, mi) \
56: ((__GNUC__ > (ma)) || (__GNUC__ == (ma) && __GNUC_MINOR__ >= (mi)))
57: #else
58: #define __GNUC_PREREQ__(ma, mi) 0
59: #endif
60:
61: /*
62: * The __CONCAT macro is used to concatenate parts of symbol names, e.g.
63: * with "#define OLD(foo) __CONCAT(old,foo)", OLD(foo) produces oldfoo.
64: * The __CONCAT macro is a bit tricky -- make sure you don't put spaces
65: * in between its arguments. __CONCAT can also concatenate double-quoted
66: * strings produced by the __STRING macro, but this only works with ANSI C.
67: */
68: #if defined(__STDC__) || defined(__cplusplus)
69: #define __P(protos) protos /* full-blown ANSI C */
70: #define __CONCAT(x,y) x ## y
71: #define __STRING(x) #x
72:
73: #define __const const /* define reserved names to standard */
74: #define __signed signed
75: #define __volatile volatile
76: #if defined(__cplusplus)
77: #define __inline inline /* convert to C++ keyword */
78: #else
79: #if !defined(__GNUC__) && !defined(lint)
80: #define __inline /* delete GCC keyword */
81: #endif /* !__GNUC__ && !lint */
82: #endif /* !__cplusplus */
83:
84: #else /* !(__STDC__ || __cplusplus) */
85: #define __P(protos) () /* traditional C preprocessor */
86: #define __CONCAT(x,y) x/**/y
87: #define __STRING(x) "x"
88:
89: #if !defined(__GNUC__) && !defined(lint)
90: #define __const /* delete pseudo-ANSI C keywords */
91: #define __inline
92: #define __signed
93: #define __volatile
94: #endif /* !__GNUC__ && !lint */
95:
96: /*
97: * In non-ANSI C environments, new programs will want ANSI-only C keywords
98: * deleted from the program and old programs will want them left alone.
99: * Programs using the ANSI C keywords const, inline etc. as normal
100: * identifiers should define -DNO_ANSI_KEYWORDS.
101: */
102: #ifndef NO_ANSI_KEYWORDS
103: #define const __const /* convert ANSI C keywords */
104: #define inline __inline
105: #define signed __signed
106: #define volatile __volatile
107: #endif /* !NO_ANSI_KEYWORDS */
108: #endif /* !(__STDC__ || __cplusplus) */
109:
110: /*
111: * GCC1 and some versions of GCC2 declare dead (non-returning) and
112: * pure (no side effects) functions using "volatile" and "const";
113: * unfortunately, these then cause warnings under "-ansi -pedantic".
114: * GCC >= 2.5 uses the __attribute__((attrs)) style. All of these
115: * work for GNU C++ (modulo a slight glitch in the C++ grammar in
116: * the distribution version of 2.5.5).
117: */
118:
119: #if !__GNUC_PREREQ__(2, 5)
120: #define __attribute__(x) /* delete __attribute__ if non-gcc or gcc1 */
121: #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
122: #define __dead __volatile
123: #define __pure __const
124: #elif defined(lint)
125: #define __dead /* NORETURN */
126: #endif
127: #elif !defined(__STRICT_ANSI__)
128: #define __dead __attribute__((__noreturn__))
129: #define __pure __attribute__((__const__))
130: #endif
131:
132: /*
133: * GNU C version 2.96 adds explicit branch prediction so that
134: * the CPU back-end can hint the processor and also so that
135: * code blocks can be reordered such that the predicted path
136: * sees a more linear flow, thus improving cache behavior, etc.
137: *
138: * The following two macros provide us with a way to utilize this
139: * compiler feature. Use __predict_true() if you expect the expression
140: * to evaluate to true, and __predict_false() if you expect the
141: * expression to evaluate to false.
142: *
143: * A few notes about usage:
144: *
145: * * Generally, __predict_false() error condition checks (unless
146: * you have some _strong_ reason to do otherwise, in which case
147: * document it), and/or __predict_true() `no-error' condition
148: * checks, assuming you want to optimize for the no-error case.
149: *
150: * * Other than that, if you don't know the likelihood of a test
151: * succeeding from empirical or other `hard' evidence, don't
152: * make predictions.
153: *
154: * * These are meant to be used in places that are run `a lot'.
155: * It is wasteful to make predictions in code that is run
156: * seldomly (e.g. at subsystem initialization time) as the
157: * basic block reordering that this affects can often generate
158: * larger code.
159: */
160: #if __GNUC_PREREQ__(2, 96)
161: #define __predict_true(exp) __builtin_expect(((exp) != 0), 1)
162: #define __predict_false(exp) __builtin_expect(((exp) != 0), 0)
163: #else
164: #define __predict_true(exp) ((exp) != 0)
165: #define __predict_false(exp) ((exp) != 0)
166: #endif
167:
168: /* Delete pseudo-keywords wherever they are not available or needed. */
169: #ifndef __dead
170: #define __dead
171: #define __pure
172: #endif
173:
174: #if __GNUC_PREREQ__(2, 7)
175: #define __packed __attribute__((__packed__))
176: #elif defined(lint)
177: #define __packed
178: #endif
179:
180: #if !__GNUC_PREREQ__(2, 8)
181: #define __extension__
182: #endif
183:
184: #if __GNUC_PREREQ__(2, 8)
185: #define __statement(x) __extension__(x)
186: #elif defined(lint)
187: #define __statement(x) (0)
188: #else
189: #define __statement(x) (x)
190: #endif
191:
192: #if __GNUC_PREREQ__(3, 0)
193: #define __malloc __attribute__((__malloc__))
194: #else
195: #define __malloc
196: #endif
197:
198: /*
199: * "The nice thing about standards is that there are so many to choose from."
200: * There are a number of "feature test macros" specified by (different)
201: * standards that determine which interfaces and types the header files
202: * should expose.
203: *
204: * Because of inconsistencies in these macros, we define our own
205: * set in the private name space that end in _VISIBLE. These are
206: * always defined and so headers can test their values easily.
207: * Things can get tricky when multiple feature macros are defined.
208: * We try to take the union of all the features requested.
209: *
210: * The following macros are guaranteed to have a value after cdefs.h
211: * has been included:
212: * __POSIX_VISIBLE
213: * __XPG_VISIBLE
214: * __ISO_C_VISIBLE
215: * __BSD_VISIBLE
216: */
217:
218: /*
219: * X/Open Portability Guides and Single Unix Specifications.
220: * _XOPEN_SOURCE XPG3
221: * _XOPEN_SOURCE && _XOPEN_VERSION = 4 XPG4
222: * _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED = 1 XPG4v2
223: * _XOPEN_SOURCE == 500 XPG5
224: * _XOPEN_SOURCE == 520 XPG5v2
225: * _XOPEN_SOURCE == 600 POSIX 1003.1-2001 with XSI
226: *
227: * The XPG spec implies a specific value for _POSIX_C_SOURCE.
228: */
229: #ifdef _XOPEN_SOURCE
230: # if (_XOPEN_SOURCE - 0 >= 600)
231: # define __XPG_VISIBLE 600
232: # undef _POSIX_C_SOURCE
233: # define _POSIX_C_SOURCE 200112L
234: # elif (_XOPEN_SOURCE - 0 >= 520)
235: # define __XPG_VISIBLE 520
236: # undef _POSIX_C_SOURCE
237: # define _POSIX_C_SOURCE 199506L
238: # elif (_XOPEN_SOURCE - 0 >= 500)
239: # define __XPG_VISIBLE 500
240: # undef _POSIX_C_SOURCE
241: # define _POSIX_C_SOURCE 199506L
242: # elif (_XOPEN_SOURCE_EXTENDED - 0 == 1)
243: # define __XPG_VISIBLE 420
244: # elif (_XOPEN_VERSION - 0 >= 4)
245: # define __XPG_VISIBLE 400
246: # else
247: # define __XPG_VISIBLE 300
248: # endif
249: #endif
250:
251: /*
252: * POSIX macros, these checks must follow the XOPEN ones above.
253: *
254: * _POSIX_SOURCE == 1 1003.1-1988 (superseded by _POSIX_C_SOURCE)
255: * _POSIX_C_SOURCE == 1 1003.1-1990
256: * _POSIX_C_SOURCE == 2 1003.2-1992
257: * _POSIX_C_SOURCE == 199309L 1003.1b-1993
258: * _POSIX_C_SOURCE == 199506L 1003.1c-1995, 1003.1i-1995,
259: * and the omnibus ISO/IEC 9945-1:1996
260: * _POSIX_C_SOURCE == 200112L 1003.1-2001
261: *
262: * The POSIX spec implies a specific value for __ISO_C_VISIBLE, though
263: * this may be overridden by the _ISOC99_SOURCE macro later.
264: */
265: #ifdef _POSIX_C_SOURCE
266: # if (_POSIX_C_SOURCE - 0 >= 200112)
267: # define __POSIX_VISIBLE 200112
268: # define __ISO_C_VISIBLE 1999
269: # elif (_POSIX_C_SOURCE - 0 >= 199506)
270: # define __POSIX_VISIBLE 199506
271: # define __ISO_C_VISIBLE 1990
272: # elif (_POSIX_C_SOURCE - 0 >= 199309)
273: # define __POSIX_VISIBLE 199309
274: # define __ISO_C_VISIBLE 1990
275: # elif (_POSIX_C_SOURCE - 0 >= 2)
276: # define __POSIX_VISIBLE 199209
277: # define __ISO_C_VISIBLE 1990
278: # else
279: # define __POSIX_VISIBLE 199009
280: # define __ISO_C_VISIBLE 1990
281: # endif
282: #elif defined(_POSIX_SOURCE)
283: # define __POSIX_VISIBLE 198808
284: # define __ISO_C_VISIBLE 0
285: #endif
286:
287: /*
288: * _ANSI_SOURCE means to expose ANSI C89 interfaces only.
289: * If the user defines it in addition to one of the POSIX or XOPEN
290: * macros, assume the POSIX/XOPEN macro(s) should take precedence.
291: */
292: #if defined(_ANSI_SOURCE) && !defined(__POSIX_VISIBLE) && \
293: !defined(__XPG_VISIBLE)
294: # define __POSIX_VISIBLE 0
295: # define __XPG_VISIBLE 0
296: # define __ISO_C_VISIBLE 1990
297: #endif
298:
299: /*
300: * _ISOC99_SOURCE and __STDC_VERSION__ override any of the other macros since
301: * they are non-exclusive.
302: */
303: #if defined(_ISOC99_SOURCE) || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901)
304: # undef __ISO_C_VISIBLE
305: # define __ISO_C_VISIBLE 1999
306: #endif
307:
308: /*
309: * Finally deal with BSD-specific interfaces that are not covered
310: * by any standards. We expose these when one of the POSIX or XPG
311: * macros is defined or if the user explicitly asks for them.
312: */
313: #if !defined(_BSD_SOURCE) && \
314: (defined(_ANSI_SOURCE) || defined(__XPG_VISIBLE) || defined(__POSIX_VISIBLE))
315: # define __BSD_VISIBLE 0
316: #endif
317:
318: /*
319: * Default values.
320: */
321: #ifndef __XPG_VISIBLE
322: # define __XPG_VISIBLE 600
323: #endif
324: #ifndef __POSIX_VISIBLE
325: # define __POSIX_VISIBLE 200112
326: #endif
327: #ifndef __ISO_C_VISIBLE
328: # define __ISO_C_VISIBLE 1999
329: #endif
330: #ifndef __BSD_VISIBLE
331: # define __BSD_VISIBLE 1
332: #endif
333:
334: #endif /* !_SYS_CDEFS_H_ */
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