Annotation of /trunk/mkinitrd-magellan/busybox/include/platform.h
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Revision 988 -
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Sun May 30 11:41:13 2010 UTC (14 years ago) by niro
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Sun May 30 11:41:13 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 12150 byte(s)
-added upstream dnsd patch
1 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | niro | 816 | Copyright 2006, Bernhard Reutner-Fischer |
4 | niro | 532 | |
5 | Licensed under the GPL v2 or later, see the file LICENSE in this tarball. | ||
6 | */ | ||
7 | niro | 984 | #ifndef BB_PLATFORM_H |
8 | #define BB_PLATFORM_H 1 | ||
9 | niro | 532 | |
10 | niro | 984 | /* Assume all these functions exist by default. Platforms where it is not |
11 | * true will #undef them below. | ||
12 | */ | ||
13 | #define HAVE_FDPRINTF 1 | ||
14 | #define HAVE_MEMRCHR 1 | ||
15 | #define HAVE_MKDTEMP 1 | ||
16 | #define HAVE_SETBIT 1 | ||
17 | #define HAVE_STRCASESTR 1 | ||
18 | #define HAVE_STRCHRNUL 1 | ||
19 | #define HAVE_STRSIGNAL 1 | ||
20 | #define HAVE_VASPRINTF 1 | ||
21 | |||
22 | niro | 532 | /* Convenience macros to test the version of gcc. */ |
23 | #undef __GNUC_PREREQ | ||
24 | #if defined __GNUC__ && defined __GNUC_MINOR__ | ||
25 | # define __GNUC_PREREQ(maj, min) \ | ||
26 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) | ||
27 | #else | ||
28 | # define __GNUC_PREREQ(maj, min) 0 | ||
29 | #endif | ||
30 | |||
31 | /* __restrict is known in EGCS 1.2 and above. */ | ||
32 | niro | 816 | #if !__GNUC_PREREQ(2,92) |
33 | niro | 532 | # ifndef __restrict |
34 | niro | 984 | # define __restrict |
35 | niro | 532 | # endif |
36 | #endif | ||
37 | |||
38 | /* Define macros for some gcc attributes. This permits us to use the | ||
39 | macros freely, and know that they will come into play for the | ||
40 | version of gcc in which they are supported. */ | ||
41 | |||
42 | niro | 816 | #if !__GNUC_PREREQ(2,7) |
43 | niro | 532 | # ifndef __attribute__ |
44 | # define __attribute__(x) | ||
45 | # endif | ||
46 | #endif | ||
47 | |||
48 | #undef inline | ||
49 | #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L | ||
50 | /* it's a keyword */ | ||
51 | niro | 984 | #elif __GNUC_PREREQ(2,7) |
52 | # define inline __inline__ | ||
53 | niro | 532 | #else |
54 | niro | 984 | # define inline |
55 | niro | 532 | #endif |
56 | |||
57 | #ifndef __const | ||
58 | # define __const const | ||
59 | #endif | ||
60 | |||
61 | niro | 816 | #define UNUSED_PARAM __attribute__ ((__unused__)) |
62 | #define NORETURN __attribute__ ((__noreturn__)) | ||
63 | niro | 984 | /* "The malloc attribute is used to tell the compiler that a function |
64 | * may be treated as if any non-NULL pointer it returns cannot alias | ||
65 | * any other pointer valid when the function returns. This will often | ||
66 | * improve optimization. Standard functions with this property include | ||
67 | * malloc and calloc. realloc-like functions have this property as long | ||
68 | * as the old pointer is never referred to (including comparing it | ||
69 | * to the new pointer) after the function returns a non-NULL value." | ||
70 | */ | ||
71 | #define RETURNS_MALLOC __attribute__ ((malloc)) | ||
72 | niro | 816 | #define PACKED __attribute__ ((__packed__)) |
73 | #define ALIGNED(m) __attribute__ ((__aligned__(m))) | ||
74 | niro | 984 | |
75 | niro | 816 | /* __NO_INLINE__: some gcc's do not honor inlining! :( */ |
76 | #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__) | ||
77 | # define ALWAYS_INLINE __attribute__ ((always_inline)) inline | ||
78 | /* I've seen a toolchain where I needed __noinline__ instead of noinline */ | ||
79 | # define NOINLINE __attribute__((__noinline__)) | ||
80 | # if !ENABLE_WERROR | ||
81 | # define DEPRECATED __attribute__ ((__deprecated__)) | ||
82 | # define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result)) | ||
83 | niro | 532 | # else |
84 | niro | 984 | # define DEPRECATED |
85 | # define UNUSED_PARAM_RESULT | ||
86 | niro | 532 | # endif |
87 | niro | 816 | #else |
88 | niro | 984 | # define ALWAYS_INLINE inline |
89 | # define NOINLINE | ||
90 | # define DEPRECATED | ||
91 | # define UNUSED_PARAM_RESULT | ||
92 | niro | 816 | #endif |
93 | niro | 532 | |
94 | /* -fwhole-program makes all symbols local. The attribute externally_visible | ||
95 | forces a symbol global. */ | ||
96 | niro | 816 | #if __GNUC_PREREQ(4,1) |
97 | # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") )) | ||
98 | //__attribute__ ((__externally_visible__)) | ||
99 | #else | ||
100 | # define EXTERNALLY_VISIBLE | ||
101 | niro | 984 | #endif |
102 | niro | 532 | |
103 | /* We use __extension__ in some places to suppress -pedantic warnings | ||
104 | about GCC extensions. This feature didn't work properly before | ||
105 | gcc 2.8. */ | ||
106 | niro | 816 | #if !__GNUC_PREREQ(2,8) |
107 | niro | 532 | # ifndef __extension__ |
108 | # define __extension__ | ||
109 | # endif | ||
110 | #endif | ||
111 | |||
112 | /* gcc-2.95 had no va_copy but only __va_copy. */ | ||
113 | niro | 816 | #if !__GNUC_PREREQ(3,0) |
114 | niro | 532 | # include <stdarg.h> |
115 | # if !defined va_copy && defined __va_copy | ||
116 | # define va_copy(d,s) __va_copy((d),(s)) | ||
117 | # endif | ||
118 | #endif | ||
119 | |||
120 | niro | 816 | /* FAST_FUNC is a qualifier which (possibly) makes function call faster |
121 | * and/or smaller by using modified ABI. It is usually only needed | ||
122 | * on non-static, busybox internal functions. Recent versions of gcc | ||
123 | * optimize statics automatically. FAST_FUNC on static is required | ||
124 | * only if you need to match a function pointer's type */ | ||
125 | #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */ | ||
126 | /* stdcall makes callee to pop arguments from stack, not caller */ | ||
127 | # define FAST_FUNC __attribute__((regparm(3),stdcall)) | ||
128 | /* #elif ... - add your favorite arch today! */ | ||
129 | #else | ||
130 | # define FAST_FUNC | ||
131 | #endif | ||
132 | |||
133 | niro | 984 | /* Make all declarations hidden (-fvisibility flag only affects definitions) */ |
134 | /* (don't include system headers after this until corresponding pop!) */ | ||
135 | #if __GNUC_PREREQ(4,1) | ||
136 | # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)") | ||
137 | # define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop") | ||
138 | #else | ||
139 | # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN | ||
140 | # define POP_SAVED_FUNCTION_VISIBILITY | ||
141 | #endif | ||
142 | |||
143 | niro | 532 | /* ---- Endian Detection ------------------------------------ */ |
144 | |||
145 | niro | 984 | #if defined(__digital__) && defined(__unix__) |
146 | niro | 532 | # include <sex.h> |
147 | # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN) | ||
148 | # define __BYTE_ORDER BYTE_ORDER | ||
149 | niro | 984 | #elif defined __FreeBSD__ |
150 | # include <sys/resource.h> /* rlimit */ | ||
151 | # include <machine/endian.h> | ||
152 | # define bswap_64 __bswap64 | ||
153 | # define bswap_32 __bswap32 | ||
154 | # define bswap_16 __bswap16 | ||
155 | # define __BIG_ENDIAN__ (_BYTE_ORDER == _BIG_ENDIAN) | ||
156 | niro | 532 | #elif !defined __APPLE__ |
157 | # include <byteswap.h> | ||
158 | # include <endian.h> | ||
159 | #endif | ||
160 | |||
161 | niro | 984 | #if defined(__BIG_ENDIAN__) && __BIG_ENDIAN__ |
162 | niro | 532 | # define BB_BIG_ENDIAN 1 |
163 | # define BB_LITTLE_ENDIAN 0 | ||
164 | #elif __BYTE_ORDER == __BIG_ENDIAN | ||
165 | # define BB_BIG_ENDIAN 1 | ||
166 | # define BB_LITTLE_ENDIAN 0 | ||
167 | niro | 984 | #elif __BYTE_ORDER == __LITTLE_ENDIAN |
168 | niro | 532 | # define BB_BIG_ENDIAN 0 |
169 | # define BB_LITTLE_ENDIAN 1 | ||
170 | niro | 984 | #else |
171 | # error "Can't determine endianness" | ||
172 | niro | 532 | #endif |
173 | |||
174 | niro | 816 | /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */ |
175 | niro | 532 | #if BB_BIG_ENDIAN |
176 | niro | 984 | # define SWAP_BE16(x) (x) |
177 | # define SWAP_BE32(x) (x) | ||
178 | # define SWAP_BE64(x) (x) | ||
179 | # define SWAP_LE16(x) bswap_16(x) | ||
180 | # define SWAP_LE32(x) bswap_32(x) | ||
181 | # define SWAP_LE64(x) bswap_64(x) | ||
182 | niro | 532 | #else |
183 | niro | 984 | # define SWAP_BE16(x) bswap_16(x) |
184 | # define SWAP_BE32(x) bswap_32(x) | ||
185 | # define SWAP_BE64(x) bswap_64(x) | ||
186 | # define SWAP_LE16(x) (x) | ||
187 | # define SWAP_LE32(x) (x) | ||
188 | # define SWAP_LE64(x) (x) | ||
189 | niro | 532 | #endif |
190 | |||
191 | niro | 816 | /* ---- Unaligned access ------------------------------------ */ |
192 | |||
193 | niro | 984 | /* NB: unaligned parameter should be a pointer, aligned one - |
194 | * a lvalue. This makes it more likely to not swap them by mistake | ||
195 | */ | ||
196 | niro | 816 | #if defined(i386) || defined(__x86_64__) |
197 | niro | 984 | # define move_from_unaligned_int(v, intp) ((v) = *(int*)(intp)) |
198 | # define move_from_unaligned16(v, u16p) ((v) = *(uint16_t*)(u16p)) | ||
199 | # define move_from_unaligned32(v, u32p) ((v) = *(uint32_t*)(u32p)) | ||
200 | # define move_to_unaligned32(u32p, v) (*(uint32_t*)(u32p) = (v)) | ||
201 | niro | 816 | /* #elif ... - add your favorite arch today! */ |
202 | #else | ||
203 | /* performs reasonably well (gcc usually inlines memcpy here) */ | ||
204 | niro | 984 | # define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int))) |
205 | # define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2)) | ||
206 | # define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4)) | ||
207 | # define move_to_unaligned32(u32p, v) do { \ | ||
208 | uint32_t __t = (v); \ | ||
209 | memcpy((u32p), &__t, 4); \ | ||
210 | } while (0) | ||
211 | niro | 816 | #endif |
212 | |||
213 | niro | 532 | /* ---- Networking ------------------------------------------ */ |
214 | niro | 816 | |
215 | niro | 532 | #ifndef __APPLE__ |
216 | # include <arpa/inet.h> | ||
217 | niro | 984 | # if !defined(__socklen_t_defined) && !defined(_SOCKLEN_T_DECLARED) |
218 | niro | 816 | typedef int socklen_t; |
219 | # endif | ||
220 | niro | 532 | #else |
221 | # include <netinet/in.h> | ||
222 | #endif | ||
223 | |||
224 | niro | 816 | /* ---- Compiler dependent settings ------------------------- */ |
225 | niro | 532 | |
226 | niro | 984 | #if (defined __digital__ && defined __unix__) \ |
227 | || defined __APPLE__ || defined __FreeBSD__ | ||
228 | niro | 532 | # undef HAVE_MNTENT_H |
229 | niro | 816 | # undef HAVE_SYS_STATFS_H |
230 | niro | 532 | #else |
231 | # define HAVE_MNTENT_H 1 | ||
232 | niro | 816 | # define HAVE_SYS_STATFS_H 1 |
233 | #endif | ||
234 | |||
235 | niro | 532 | /*----- Kernel versioning ------------------------------------*/ |
236 | niro | 816 | |
237 | niro | 532 | #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) |
238 | |||
239 | niro | 816 | /* ---- Miscellaneous --------------------------------------- */ |
240 | niro | 532 | |
241 | #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \ | ||
242 | !defined(__dietlibc__) && \ | ||
243 | !defined(_NEWLIB_VERSION) && \ | ||
244 | !(defined __digital__ && defined __unix__) | ||
245 | # error "Sorry, this libc version is not supported :(" | ||
246 | #endif | ||
247 | |||
248 | niro | 816 | /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */ |
249 | niro | 532 | |
250 | #if defined __GLIBC__ || defined __UCLIBC__ \ | ||
251 | niro | 984 | || defined __dietlibc__ || defined _NEWLIB_VERSION |
252 | # include <features.h> | ||
253 | # define HAVE_FEATURES_H | ||
254 | # include <stdint.h> | ||
255 | # define HAVE_STDINT_H | ||
256 | niro | 816 | #elif !defined __APPLE__ |
257 | niro | 984 | /* Largest integral types. */ |
258 | # if BB_BIG_ENDIAN | ||
259 | /* Looks BROKEN! */ | ||
260 | niro | 816 | typedef long intmax_t; |
261 | typedef unsigned long uintmax_t; | ||
262 | niro | 984 | # else |
263 | niro | 532 | __extension__ |
264 | niro | 816 | typedef long long intmax_t; |
265 | niro | 532 | __extension__ |
266 | niro | 816 | typedef unsigned long long uintmax_t; |
267 | niro | 984 | # endif |
268 | niro | 532 | #endif |
269 | |||
270 | /* Size-saving "small" ints (arch-dependent) */ | ||
271 | #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__) | ||
272 | /* add other arches which benefit from this... */ | ||
273 | typedef signed char smallint; | ||
274 | typedef unsigned char smalluint; | ||
275 | #else | ||
276 | /* for arches where byte accesses generate larger code: */ | ||
277 | typedef int smallint; | ||
278 | typedef unsigned smalluint; | ||
279 | #endif | ||
280 | |||
281 | niro | 816 | /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */ |
282 | #if (defined __digital__ && defined __unix__) | ||
283 | /* old system without (proper) C99 support */ | ||
284 | niro | 984 | # define bool smalluint |
285 | niro | 816 | #else |
286 | /* modern system, so use it */ | ||
287 | niro | 984 | # include <stdbool.h> |
288 | niro | 816 | #endif |
289 | |||
290 | /* Try to defeat gcc's alignment of "char message[]"-like data */ | ||
291 | #if 1 /* if needed: !defined(arch1) && !defined(arch2) */ | ||
292 | niro | 984 | # define ALIGN1 __attribute__((aligned(1))) |
293 | # define ALIGN2 __attribute__((aligned(2))) | ||
294 | niro | 988 | # define ALIGN4 __attribute__((aligned(4))) |
295 | niro | 816 | #else |
296 | /* Arches which MUST have 2 or 4 byte alignment for everything are here */ | ||
297 | niro | 984 | # define ALIGN1 |
298 | # define ALIGN2 | ||
299 | niro | 988 | # define ALIGN4 |
300 | niro | 816 | #endif |
301 | |||
302 | |||
303 | niro | 532 | /* uclibc does not implement daemon() for no-mmu systems. |
304 | * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably. | ||
305 | * For earlier versions there is no reliable way to check if we are building | ||
306 | niro | 816 | * for a mmu-less system. |
307 | niro | 532 | */ |
308 | niro | 816 | #if ENABLE_NOMMU || \ |
309 | (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \ | ||
310 | __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__) | ||
311 | niro | 984 | # define BB_MMU 0 |
312 | # define USE_FOR_NOMMU(...) __VA_ARGS__ | ||
313 | # define USE_FOR_MMU(...) | ||
314 | niro | 816 | #else |
315 | niro | 984 | # define BB_MMU 1 |
316 | # define USE_FOR_NOMMU(...) | ||
317 | # define USE_FOR_MMU(...) __VA_ARGS__ | ||
318 | niro | 532 | #endif |
319 | |||
320 | niro | 984 | /* Don't use lchown with glibc older than 2.1.x */ |
321 | #if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1 | ||
322 | niro | 532 | # define lchown chown |
323 | #endif | ||
324 | |||
325 | niro | 984 | #if defined(__digital__) && defined(__unix__) |
326 | niro | 532 | |
327 | niro | 984 | # include <standards.h> |
328 | # include <inttypes.h> | ||
329 | # define PRIu32 "u" | ||
330 | niro | 816 | /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */ |
331 | niro | 984 | # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0) |
332 | # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET | ||
333 | # define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET) | ||
334 | # endif | ||
335 | # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY | ||
336 | # define ADJ_FREQUENCY MOD_FREQUENCY | ||
337 | # endif | ||
338 | # if !defined ADJ_TIMECONST && defined MOD_TIMECONST | ||
339 | # define ADJ_TIMECONST MOD_TIMECONST | ||
340 | # endif | ||
341 | # if !defined ADJ_TICK && defined MOD_CLKB | ||
342 | # define ADJ_TICK MOD_CLKB | ||
343 | # endif | ||
344 | niro | 532 | |
345 | niro | 984 | #else |
346 | |||
347 | # define bb_setpgrp() setpgrp() | ||
348 | |||
349 | niro | 532 | #endif |
350 | niro | 984 | |
351 | #if defined(__GLIBC__) | ||
352 | # define fdprintf dprintf | ||
353 | niro | 532 | #endif |
354 | niro | 984 | |
355 | #if defined(__dietlibc__) | ||
356 | # undef HAVE_STRCHRNUL | ||
357 | niro | 532 | #endif |
358 | niro | 984 | |
359 | #if defined(__WATCOMC__) | ||
360 | # undef HAVE_FDPRINTF | ||
361 | # undef HAVE_MEMRCHR | ||
362 | # undef HAVE_MKDTEMP | ||
363 | # undef HAVE_SETBIT | ||
364 | # undef HAVE_STRCASESTR | ||
365 | # undef HAVE_STRCHRNUL | ||
366 | # undef HAVE_STRSIGNAL | ||
367 | # undef HAVE_VASPRINTF | ||
368 | niro | 532 | #endif |
369 | |||
370 | niro | 984 | #if defined(__FreeBSD__) |
371 | # undef HAVE_STRCHRNUL | ||
372 | niro | 532 | #endif |
373 | |||
374 | niro | 984 | /* |
375 | * Now, define prototypes for all the functions defined in platform.c | ||
376 | * These must come after all the HAVE_* macros are defined (or not) | ||
377 | */ | ||
378 | |||
379 | #ifndef HAVE_FDPRINTF | ||
380 | extern int fdprintf(int fd, const char *format, ...); | ||
381 | niro | 532 | #endif |
382 | niro | 984 | |
383 | #ifndef HAVE_MEMRCHR | ||
384 | extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC; | ||
385 | niro | 532 | #endif |
386 | niro | 984 | |
387 | #ifndef HAVE_MKDTEMP | ||
388 | extern char *mkdtemp(char *template) FAST_FUNC; | ||
389 | niro | 532 | #endif |
390 | niro | 984 | |
391 | #ifndef HAVE_SETBIT | ||
392 | # define setbit(a, b) ((a)[(b) >> 3] |= 1 << ((b) & 7)) | ||
393 | # define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7))) | ||
394 | niro | 532 | #endif |
395 | |||
396 | niro | 984 | #ifndef HAVE_STRCASESTR |
397 | extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC; | ||
398 | niro | 532 | #endif |
399 | niro | 984 | |
400 | #ifndef HAVE_STRCHRNUL | ||
401 | extern char *strchrnul(const char *s, int c) FAST_FUNC; | ||
402 | niro | 532 | #endif |
403 | niro | 984 | |
404 | #ifndef HAVE_STRSIGNAL | ||
405 | /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */ | ||
406 | # define strsignal(sig) get_signame(sig) | ||
407 | niro | 532 | #endif |
408 | niro | 984 | |
409 | #ifndef HAVE_VASPRINTF | ||
410 | extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC; | ||
411 | niro | 532 | #endif |
412 | |||
413 | #endif |