Contents 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 (13 years, 11 months ago) by niro
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File size: 12150 byte(s)
Sun May 30 11:41:13 2010 UTC (13 years, 11 months ago) by niro
File MIME type: text/plain
File size: 12150 byte(s)
-added upstream dnsd patch
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | Copyright 2006, Bernhard Reutner-Fischer |
| 4 | |
| 5 | Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
| 6 | */ |
| 7 | #ifndef BB_PLATFORM_H |
| 8 | #define BB_PLATFORM_H 1 |
| 9 | |
| 10 | /* 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 | /* 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 | #if !__GNUC_PREREQ(2,92) |
| 33 | # ifndef __restrict |
| 34 | # define __restrict |
| 35 | # 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 | #if !__GNUC_PREREQ(2,7) |
| 43 | # 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 | #elif __GNUC_PREREQ(2,7) |
| 52 | # define inline __inline__ |
| 53 | #else |
| 54 | # define inline |
| 55 | #endif |
| 56 | |
| 57 | #ifndef __const |
| 58 | # define __const const |
| 59 | #endif |
| 60 | |
| 61 | #define UNUSED_PARAM __attribute__ ((__unused__)) |
| 62 | #define NORETURN __attribute__ ((__noreturn__)) |
| 63 | /* "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 | #define PACKED __attribute__ ((__packed__)) |
| 73 | #define ALIGNED(m) __attribute__ ((__aligned__(m))) |
| 74 | |
| 75 | /* __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 | # else |
| 84 | # define DEPRECATED |
| 85 | # define UNUSED_PARAM_RESULT |
| 86 | # endif |
| 87 | #else |
| 88 | # define ALWAYS_INLINE inline |
| 89 | # define NOINLINE |
| 90 | # define DEPRECATED |
| 91 | # define UNUSED_PARAM_RESULT |
| 92 | #endif |
| 93 | |
| 94 | /* -fwhole-program makes all symbols local. The attribute externally_visible |
| 95 | forces a symbol global. */ |
| 96 | #if __GNUC_PREREQ(4,1) |
| 97 | # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") )) |
| 98 | //__attribute__ ((__externally_visible__)) |
| 99 | #else |
| 100 | # define EXTERNALLY_VISIBLE |
| 101 | #endif |
| 102 | |
| 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 | #if !__GNUC_PREREQ(2,8) |
| 107 | # ifndef __extension__ |
| 108 | # define __extension__ |
| 109 | # endif |
| 110 | #endif |
| 111 | |
| 112 | /* gcc-2.95 had no va_copy but only __va_copy. */ |
| 113 | #if !__GNUC_PREREQ(3,0) |
| 114 | # 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 | /* 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 | /* 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 | /* ---- Endian Detection ------------------------------------ */ |
| 144 | |
| 145 | #if defined(__digital__) && defined(__unix__) |
| 146 | # include <sex.h> |
| 147 | # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN) |
| 148 | # define __BYTE_ORDER BYTE_ORDER |
| 149 | #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 | #elif !defined __APPLE__ |
| 157 | # include <byteswap.h> |
| 158 | # include <endian.h> |
| 159 | #endif |
| 160 | |
| 161 | #if defined(__BIG_ENDIAN__) && __BIG_ENDIAN__ |
| 162 | # 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 | #elif __BYTE_ORDER == __LITTLE_ENDIAN |
| 168 | # define BB_BIG_ENDIAN 0 |
| 169 | # define BB_LITTLE_ENDIAN 1 |
| 170 | #else |
| 171 | # error "Can't determine endianness" |
| 172 | #endif |
| 173 | |
| 174 | /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */ |
| 175 | #if BB_BIG_ENDIAN |
| 176 | # 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 | #else |
| 183 | # 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 | #endif |
| 190 | |
| 191 | /* ---- Unaligned access ------------------------------------ */ |
| 192 | |
| 193 | /* 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 | #if defined(i386) || defined(__x86_64__) |
| 197 | # 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 | /* #elif ... - add your favorite arch today! */ |
| 202 | #else |
| 203 | /* performs reasonably well (gcc usually inlines memcpy here) */ |
| 204 | # 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 | #endif |
| 212 | |
| 213 | /* ---- Networking ------------------------------------------ */ |
| 214 | |
| 215 | #ifndef __APPLE__ |
| 216 | # include <arpa/inet.h> |
| 217 | # if !defined(__socklen_t_defined) && !defined(_SOCKLEN_T_DECLARED) |
| 218 | typedef int socklen_t; |
| 219 | # endif |
| 220 | #else |
| 221 | # include <netinet/in.h> |
| 222 | #endif |
| 223 | |
| 224 | /* ---- Compiler dependent settings ------------------------- */ |
| 225 | |
| 226 | #if (defined __digital__ && defined __unix__) \ |
| 227 | || defined __APPLE__ || defined __FreeBSD__ |
| 228 | # undef HAVE_MNTENT_H |
| 229 | # undef HAVE_SYS_STATFS_H |
| 230 | #else |
| 231 | # define HAVE_MNTENT_H 1 |
| 232 | # define HAVE_SYS_STATFS_H 1 |
| 233 | #endif |
| 234 | |
| 235 | /*----- Kernel versioning ------------------------------------*/ |
| 236 | |
| 237 | #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) |
| 238 | |
| 239 | /* ---- Miscellaneous --------------------------------------- */ |
| 240 | |
| 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 | /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */ |
| 249 | |
| 250 | #if defined __GLIBC__ || defined __UCLIBC__ \ |
| 251 | || defined __dietlibc__ || defined _NEWLIB_VERSION |
| 252 | # include <features.h> |
| 253 | # define HAVE_FEATURES_H |
| 254 | # include <stdint.h> |
| 255 | # define HAVE_STDINT_H |
| 256 | #elif !defined __APPLE__ |
| 257 | /* Largest integral types. */ |
| 258 | # if BB_BIG_ENDIAN |
| 259 | /* Looks BROKEN! */ |
| 260 | typedef long intmax_t; |
| 261 | typedef unsigned long uintmax_t; |
| 262 | # else |
| 263 | __extension__ |
| 264 | typedef long long intmax_t; |
| 265 | __extension__ |
| 266 | typedef unsigned long long uintmax_t; |
| 267 | # endif |
| 268 | #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 | /* 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 | # define bool smalluint |
| 285 | #else |
| 286 | /* modern system, so use it */ |
| 287 | # include <stdbool.h> |
| 288 | #endif |
| 289 | |
| 290 | /* Try to defeat gcc's alignment of "char message[]"-like data */ |
| 291 | #if 1 /* if needed: !defined(arch1) && !defined(arch2) */ |
| 292 | # define ALIGN1 __attribute__((aligned(1))) |
| 293 | # define ALIGN2 __attribute__((aligned(2))) |
| 294 | # define ALIGN4 __attribute__((aligned(4))) |
| 295 | #else |
| 296 | /* Arches which MUST have 2 or 4 byte alignment for everything are here */ |
| 297 | # define ALIGN1 |
| 298 | # define ALIGN2 |
| 299 | # define ALIGN4 |
| 300 | #endif |
| 301 | |
| 302 | |
| 303 | /* 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 | * for a mmu-less system. |
| 307 | */ |
| 308 | #if ENABLE_NOMMU || \ |
| 309 | (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \ |
| 310 | __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__) |
| 311 | # define BB_MMU 0 |
| 312 | # define USE_FOR_NOMMU(...) __VA_ARGS__ |
| 313 | # define USE_FOR_MMU(...) |
| 314 | #else |
| 315 | # define BB_MMU 1 |
| 316 | # define USE_FOR_NOMMU(...) |
| 317 | # define USE_FOR_MMU(...) __VA_ARGS__ |
| 318 | #endif |
| 319 | |
| 320 | /* Don't use lchown with glibc older than 2.1.x */ |
| 321 | #if defined(__GLIBC__) && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1 |
| 322 | # define lchown chown |
| 323 | #endif |
| 324 | |
| 325 | #if defined(__digital__) && defined(__unix__) |
| 326 | |
| 327 | # include <standards.h> |
| 328 | # include <inttypes.h> |
| 329 | # define PRIu32 "u" |
| 330 | /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */ |
| 331 | # 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 | |
| 345 | #else |
| 346 | |
| 347 | # define bb_setpgrp() setpgrp() |
| 348 | |
| 349 | #endif |
| 350 | |
| 351 | #if defined(__GLIBC__) |
| 352 | # define fdprintf dprintf |
| 353 | #endif |
| 354 | |
| 355 | #if defined(__dietlibc__) |
| 356 | # undef HAVE_STRCHRNUL |
| 357 | #endif |
| 358 | |
| 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 | #endif |
| 369 | |
| 370 | #if defined(__FreeBSD__) |
| 371 | # undef HAVE_STRCHRNUL |
| 372 | #endif |
| 373 | |
| 374 | /* |
| 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 | #endif |
| 382 | |
| 383 | #ifndef HAVE_MEMRCHR |
| 384 | extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC; |
| 385 | #endif |
| 386 | |
| 387 | #ifndef HAVE_MKDTEMP |
| 388 | extern char *mkdtemp(char *template) FAST_FUNC; |
| 389 | #endif |
| 390 | |
| 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 | #endif |
| 395 | |
| 396 | #ifndef HAVE_STRCASESTR |
| 397 | extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC; |
| 398 | #endif |
| 399 | |
| 400 | #ifndef HAVE_STRCHRNUL |
| 401 | extern char *strchrnul(const char *s, int c) FAST_FUNC; |
| 402 | #endif |
| 403 | |
| 404 | #ifndef HAVE_STRSIGNAL |
| 405 | /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */ |
| 406 | # define strsignal(sig) get_signame(sig) |
| 407 | #endif |
| 408 | |
| 409 | #ifndef HAVE_VASPRINTF |
| 410 | extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC; |
| 411 | #endif |
| 412 | |
| 413 | #endif |