1 /* vi: set sw=4 ts=4: */
3 Copyright 2006, Bernhard Fischer
5 Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
10 /* Convenience macros to test the version of gcc. */
12 #if defined __GNUC__ && defined __GNUC_MINOR__
13 # define __GNUC_PREREQ(maj, min) \
14 ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
16 # define __GNUC_PREREQ(maj, min) 0
19 /* __restrict is known in EGCS 1.2 and above. */
20 #if !__GNUC_PREREQ(2,92)
22 # define __restrict /* Ignore */
26 /* Define macros for some gcc attributes. This permits us to use the
27 macros freely, and know that they will come into play for the
28 version of gcc in which they are supported. */
30 #if !__GNUC_PREREQ(2,7)
31 # ifndef __attribute__
32 # define __attribute__(x)
37 #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
40 # if __GNUC_PREREQ(2,7)
41 # define inline __inline__
48 # define __const const
51 #define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
52 #define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
53 #define ATTRIBUTE_PACKED __attribute__ ((__packed__))
54 #define ATTRIBUTE_ALIGNED(m) __attribute__ ((__aligned__(m)))
55 /* __NO_INLINE__: some gcc's do not honor inlining! :( */
56 #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
57 # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
58 /* I've seen a toolchain where I needed __noinline__ instead of noinline */
59 # define NOINLINE __attribute__((__noinline__))
61 # define ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
62 # define ATTRIBUTE_UNUSED_RESULT __attribute__ ((warn_unused_result))
64 # define ATTRIBUTE_DEPRECATED /* n/a */
65 # define ATTRIBUTE_UNUSED_RESULT /* n/a */
68 # define ALWAYS_INLINE inline /* n/a */
69 # define NOINLINE /* n/a */
70 # define ATTRIBUTE_DEPRECATED /* n/a */
71 # define ATTRIBUTE_UNUSED_RESULT /* n/a */
74 /* -fwhole-program makes all symbols local. The attribute externally_visible
75 forces a symbol global. */
76 #if __GNUC_PREREQ(4,1)
77 # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
78 //__attribute__ ((__externally_visible__))
80 # define EXTERNALLY_VISIBLE
81 #endif /* GNUC >= 4.1 */
83 /* We use __extension__ in some places to suppress -pedantic warnings
84 about GCC extensions. This feature didn't work properly before
86 #if !__GNUC_PREREQ(2,8)
87 # ifndef __extension__
88 # define __extension__
92 /* gcc-2.95 had no va_copy but only __va_copy. */
93 #if !__GNUC_PREREQ(3,0)
95 # if !defined va_copy && defined __va_copy
96 # define va_copy(d,s) __va_copy((d),(s))
100 /* ---- Endian Detection ------------------------------------ */
102 #if (defined __digital__ && defined __unix__)
104 # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
105 # define __BYTE_ORDER BYTE_ORDER
106 #elif !defined __APPLE__
107 # include <byteswap.h>
111 #ifdef __BIG_ENDIAN__
112 # define BB_BIG_ENDIAN 1
113 # define BB_LITTLE_ENDIAN 0
114 #elif __BYTE_ORDER == __BIG_ENDIAN
115 # define BB_BIG_ENDIAN 1
116 # define BB_LITTLE_ENDIAN 0
118 # define BB_BIG_ENDIAN 0
119 # define BB_LITTLE_ENDIAN 1
123 #define SWAP_BE16(x) (x)
124 #define SWAP_BE32(x) (x)
125 #define SWAP_BE64(x) (x)
126 #define SWAP_LE16(x) bswap_16(x)
127 #define SWAP_LE32(x) bswap_32(x)
128 #define SWAP_LE64(x) bswap_64(x)
130 #define SWAP_BE16(x) bswap_16(x)
131 #define SWAP_BE32(x) bswap_32(x)
132 #define SWAP_BE64(x) bswap_64(x)
133 #define SWAP_LE16(x) (x)
134 #define SWAP_LE32(x) (x)
135 #define SWAP_LE64(x) (x)
138 /* ---- Networking ------------------------------------------ */
140 # include <arpa/inet.h>
141 # ifndef __socklen_t_defined
142 typedef int socklen_t;
145 # include <netinet/in.h>
148 /* ---- Compiler dependent settings ------------------------- */
149 #if (defined __digital__ && defined __unix__) || defined __APPLE__
150 # undef HAVE_MNTENT_H
151 # undef HAVE_SYS_STATFS_H
153 # define HAVE_MNTENT_H 1
154 # define HAVE_SYS_STATFS_H 1
155 #endif /* ___digital__ && __unix__ */
157 /* linux/loop.h relies on __u64. Make sure we have that as a proper type
158 * until userspace is widely fixed. */
159 #if (defined __INTEL_COMPILER && !defined __GNUC__) || \
160 (defined __GNUC__ && defined __STRICT_ANSI__)
161 __extension__ typedef __signed__ long long __s64;
162 __extension__ typedef unsigned long long __u64;
165 /*----- Kernel versioning ------------------------------------*/
166 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
168 /* ---- miscellaneous --------------------------------------- */
170 #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
171 !defined(__dietlibc__) && \
172 !defined(_NEWLIB_VERSION) && \
173 !(defined __digital__ && defined __unix__)
174 # error "Sorry, this libc version is not supported :("
177 /* Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead. */
179 #if defined __GLIBC__ || defined __UCLIBC__ \
180 || defined __dietlibc__ || defined _NEWLIB_VERSION
181 #include <features.h>
182 #define HAVE_FEATURES_H
184 #define HAVE_STDINT_H
185 #elif !defined __APPLE__
186 /* Largest integral types. */
188 typedef long intmax_t;
189 typedef unsigned long uintmax_t;
192 typedef long long intmax_t;
194 typedef unsigned long long uintmax_t;
198 /* Size-saving "small" ints (arch-dependent) */
199 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
200 /* add other arches which benefit from this... */
201 typedef signed char smallint;
202 typedef unsigned char smalluint;
204 /* for arches where byte accesses generate larger code: */
205 typedef int smallint;
206 typedef unsigned smalluint;
209 /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
210 #if (defined __digital__ && defined __unix__)
211 /* old system without (proper) C99 support */
212 #define bool smalluint
214 /* modern system, so use it */
218 /* Try to defeat gcc's alignment of "char message[]"-like data */
219 #if 1 /* if needed: !defined(arch1) && !defined(arch2) */
220 #define ALIGN1 __attribute__((aligned(1)))
221 #define ALIGN2 __attribute__((aligned(2)))
223 /* Arches which MUST have 2 or 4 byte alignment for everything are here */
229 /* uclibc does not implement daemon() for no-mmu systems.
230 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
231 * For earlier versions there is no reliable way to check if we are building
232 * for a mmu-less system.
234 #if ENABLE_NOMMU || \
235 (defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
236 __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__)
239 #define USE_FOR_NOMMU(...) __VA_ARGS__
240 #define USE_FOR_MMU(...)
243 /* BB_NOMMU is not defined in this case! */
244 #define USE_FOR_NOMMU(...)
245 #define USE_FOR_MMU(...) __VA_ARGS__
248 /* Platforms that haven't got dprintf need to implement fdprintf() in
249 * libbb. This would require a platform.c. It's not going to be cleaned
250 * out of the tree, so stop saying it should be. */
251 #if !defined(__dietlibc__)
252 /* Needed for: glibc */
253 /* Not needed for: dietlibc */
254 /* Others: ?? (add as needed) */
255 #define fdprintf dprintf
258 #if defined(__dietlibc__)
259 static ALWAYS_INLINE char* strchrnul(const char *s, char c)
261 while (*s && *s != c) ++s;
266 /* Don't use lchown with glibc older than 2.1.x ... uClibc lacks it */
267 #if (defined __GLIBC__ && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1) || \
269 # define lchown chown
272 #if (defined __digital__ && defined __unix__)
273 #include <standards.h>
274 #define HAVE_STANDARDS_H
275 #include <inttypes.h>
276 #define HAVE_INTTYPES_H
279 /* use legacy setpgrp(pid_t,pid_t) for now. move to platform.c */
280 #define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0)
282 #if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
283 #define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
285 #if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
286 #define ADJ_FREQUENCY MOD_FREQUENCY
288 #if !defined ADJ_TIMECONST && defined MOD_TIMECONST
289 #define ADJ_TIMECONST MOD_TIMECONST
291 #if !defined ADJ_TICK && defined MOD_CLKB
292 #define ADJ_TICK MOD_CLKB
296 #define bb_setpgrp() setpgrp()
299 #if defined(__linux__)
300 #include <sys/mount.h>
301 /* Make sure we have all the new mount flags we actually try to use. */
303 #define MS_BIND (1<<12)
306 #define MS_MOVE (1<<13)
309 #define MS_RECURSIVE (1<<14)
312 #define MS_SILENT (1<<15)
315 /* The shared subtree stuff, which went in around 2.6.15. */
316 #ifndef MS_UNBINDABLE
317 #define MS_UNBINDABLE (1<<17)
320 #define MS_PRIVATE (1<<18)
323 #define MS_SLAVE (1<<19)
326 #define MS_SHARED (1<<20)
330 #if !defined(BLKSSZGET)
331 #define BLKSSZGET _IO(0x12, 104)
333 #if !defined(BLKGETSIZE64)
334 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
338 #endif /* platform.h */