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 # if __GNUC_PREREQ (3,0)
56 # define ATTRIBUTE_ALWAYS_INLINE __attribute__ ((always_inline)) inline
57 # define ATTRIBUTE_DEPRECATED __attribute__ ((__deprecated__))
59 # define ATTRIBUTE_ALWAYS_INLINE inline
60 # define ATTRIBUTE_DEPRECATED /* n/a */
63 /* -fwhole-program makes all symbols local. The attribute externally_visible
64 forces a symbol global. */
65 # if __GNUC_PREREQ (4,1)
66 # define ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((__externally_visible__))
68 # define ATTRIBUTE_EXTERNALLY_VISIBLE
69 # endif /* GNUC >= 4.1 */
71 /* We use __extension__ in some places to suppress -pedantic warnings
72 about GCC extensions. This feature didn't work properly before
74 #if !__GNUC_PREREQ (2,8)
75 # ifndef __extension__
76 # define __extension__
80 /* gcc-2.95 had no va_copy but only __va_copy. */
81 #if !__GNUC_PREREQ (3,0)
83 # if !defined va_copy && defined __va_copy
84 # define va_copy(d,s) __va_copy((d),(s))
88 /* ---- Endian Detection ------------------------------------ */
90 #if (defined __digital__ && defined __unix__)
92 # define __BIG_ENDIAN__ (BYTE_ORDER == BIG_ENDIAN)
93 # define __BYTE_ORDER BYTE_ORDER
94 #elif !defined __APPLE__
95 # include <byteswap.h>
100 # define BB_BIG_ENDIAN 1
101 # define BB_LITTLE_ENDIAN 0
102 #elif __BYTE_ORDER == __BIG_ENDIAN
103 # define BB_BIG_ENDIAN 1
104 # define BB_LITTLE_ENDIAN 0
106 # define BB_BIG_ENDIAN 0
107 # define BB_LITTLE_ENDIAN 1
111 #define SWAP_BE16(x) (x)
112 #define SWAP_BE32(x) (x)
113 #define SWAP_BE64(x) (x)
114 #define SWAP_LE16(x) bswap_16(x)
115 #define SWAP_LE32(x) bswap_32(x)
116 #define SWAP_LE64(x) bswap_64(x)
118 #define SWAP_BE16(x) bswap_16(x)
119 #define SWAP_BE32(x) bswap_32(x)
120 #define SWAP_BE64(x) bswap_64(x)
121 #define SWAP_LE16(x) (x)
122 #define SWAP_LE32(x) (x)
123 #define SWAP_LE64(x) (x)
126 /* ---- Networking ------------------------------------------ */
128 # include <arpa/inet.h>
130 # include <netinet/in.h>
133 #ifndef __socklen_t_defined
134 typedef int socklen_t;
137 /* ---- Compiler dependent settings ------------------------- */
138 #if (defined __digital__ && defined __unix__)
139 # undef HAVE_MNTENT_H
141 # define HAVE_MNTENT_H 1
142 #endif /* ___digital__ && __unix__ */
144 /* linux/loop.h relies on __u64. Make sure we have that as a proper type
145 * until userspace is widely fixed. */
147 #if defined __INTEL_COMPILER
148 __extension__ typedef __signed__ long long __s64;
149 __extension__ typedef unsigned long long __u64;
150 #endif /* __INTEL_COMPILER */
151 #endif /* ifndef __GNUC__ */
153 /*----- Kernel versioning ------------------------------------*/
154 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
156 /* ---- miscellaneous --------------------------------------- */
158 #if defined(__GNU_LIBRARY__) && __GNU_LIBRARY__ < 5 && \
159 !defined(__dietlibc__) && \
160 !defined(_NEWLIB_VERSION) && \
161 !(defined __digital__ && defined __unix__)
162 # error "Sorry, this libc version is not supported :("
165 // Don't perpetuate e2fsck crap into the headers. Clean up e2fsck instead.
167 #if defined __GLIBC__ || defined __UCLIBC__ \
168 || defined __dietlibc__ || defined _NEWLIB_VERSION
169 #include <features.h>
170 #define HAVE_FEATURES_H
172 #define HAVE_STDINT_H
174 /* Largest integral types. */
176 typedef long int intmax_t;
177 typedef unsigned long int uintmax_t;
180 typedef long long int intmax_t;
182 typedef unsigned long long int uintmax_t;
186 /* Size-saving "small" ints (arch-dependent) */
187 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
188 /* add other arches which benefit from this... */
189 typedef signed char smallint;
190 typedef unsigned char smalluint;
192 /* for arches where byte accesses generate larger code: */
193 typedef int smallint;
194 typedef unsigned smalluint;
197 /* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
198 #if (defined __digital__ && defined __unix__)
199 /* old system without (proper) C99 support */
200 #define bool smalluint
202 /* modern system, so use it */
207 /* uclibc does not implement daemon() for no-mmu systems.
208 * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
209 * For earlier versions there is no reliable way to check if we are building
210 * for a mmu-less system; the user should pass EXTRA_CFLAGS="-DBB_NOMMU"
213 #if defined __UCLIBC__ && __UCLIBC_MAJOR__ >= 0 && __UCLIBC_MINOR__ >= 9 && \
214 __UCLIBC_SUBLEVEL__ > 28 && !defined __ARCH_USE_MMU__
218 /* Platforms that haven't got dprintf need to implement fdprintf() in
219 * libbb. This would require a platform.c. It's not going to be cleaned
220 * out of the tree, so stop saying it should be. */
221 #if !defined(__dietlibc__)
222 /* Needed for: glibc */
223 /* Not needed for: dietlibc */
224 /* Others: ?? (add as needed) */
225 #define fdprintf dprintf
228 #if defined(__dietlibc__)
229 static ATTRIBUTE_ALWAYS_INLINE char* strchrnul(const char *s, char c) {
230 while (*s && *s != c) ++s;
235 /* Don't use lchown with glibc older than 2.1.x ... uC-libc lacks it */
236 #if (defined __GLIBC__ && __GLIBC__ <= 2 && __GLIBC_MINOR__ < 1) || \
238 # define lchown chown
241 /* THIS SHOULD BE CLEANED OUT OF THE TREE ENTIRELY */
242 /* FIXME: fix tar.c! */
243 #ifndef FNM_LEADING_DIR
244 #define FNM_LEADING_DIR 0
247 #if (defined __digital__ && defined __unix__)
248 #include <standards.h>
249 #define HAVE_STANDARDS_H
250 #include <inttypes.h>
251 #define HAVE_INTTYPES_H
254 /* use legacy setpgrp(pidt_,pid_t) for now. move to platform.c */
255 #define bb_setpgrp do { pid_t __me = getpid(); setpgrp(__me,__me); } while (0)
257 #if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
258 #define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
260 #if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
261 #define ADJ_FREQUENCY MOD_FREQUENCY
263 #if !defined ADJ_TIMECONST && defined MOD_TIMECONST
264 #define ADJ_TIMECONST MOD_TIMECONST
266 #if !defined ADJ_TICK && defined MOD_CLKB
267 #define ADJ_TICK MOD_CLKB
271 #define bb_setpgrp setpgrp()
274 #if defined(__linux__)
275 #include <sys/mount.h>
276 // Make sure we have all the new mount flags we actually try to use.
278 #define MS_BIND (1<<12)
281 #define MS_MOVE (1<<13)
284 #define MS_RECURSIVE (1<<14)
287 #define MS_SILENT (1<<15)
290 // The shared subtree stuff, which went in around 2.6.15
291 #ifndef MS_UNBINDABLE
292 #define MS_UNBINDABLE (1<<17)
295 #define MS_PRIVATE (1<<18)
298 #define MS_SLAVE (1<<19)
301 #define MS_SHARED (1<<20)
305 #if !defined(BLKSSZGET)
306 #define BLKSSZGET _IO(0x12, 104)
308 #if !defined(BLKGETSIZE64)
309 #define BLKGETSIZE64 _IOR(0x12,114,size_t)
313 #endif /* platform.h */