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Annotation of /trunk/mkinitrd-magellan/busybox/include/platform.h

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Revision 988 - (hide annotations) (download)
Sun May 30 11:41:13 2010 UTC (13 years, 11 months ago) by niro
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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