include/platform.h - codeaurora/busybox - Gitiles

 /* vi: set sw=4 ts=4: */
 /*
  * Copyright 2006, Bernhard Reutner-Fischer
  *
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 #ifndef BB_PLATFORM_H
 #define BB_PLATFORM_H 1


 /* Convenience macros to test the version of gcc. */
 #undef __GNUC_PREREQ
 #if defined __GNUC__ && defined __GNUC_MINOR__
 # define __GNUC_PREREQ(maj, min) \
 		((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
 #else
 # define __GNUC_PREREQ(maj, min) 0
 #endif

 /* __restrict is known in EGCS 1.2 and above. */
 #if !__GNUC_PREREQ(2,92)
 # ifndef __restrict
 #  define __restrict
 # endif
 #endif

 #if !__GNUC_PREREQ(2,7)
 # ifndef __attribute__
 #  define __attribute__(x)
 # endif
 #endif

 #undef inline
 #if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
 /* it's a keyword */
 #elif __GNUC_PREREQ(2,7)
 # define inline __inline__
 #else
 # define inline
 #endif

 #ifndef __const
 # define __const const
 #endif

 #define UNUSED_PARAM __attribute__ ((__unused__))
 #define NORETURN __attribute__ ((__noreturn__))
 /* "The malloc attribute is used to tell the compiler that a function
  * may be treated as if any non-NULL pointer it returns cannot alias
  * any other pointer valid when the function returns. This will often
  * improve optimization. Standard functions with this property include
  * malloc and calloc. realloc-like functions have this property as long
  * as the old pointer is never referred to (including comparing it
  * to the new pointer) after the function returns a non-NULL value."
  */
 #define RETURNS_MALLOC __attribute__ ((malloc))
 #define PACKED __attribute__ ((__packed__))
 #define ALIGNED(m) __attribute__ ((__aligned__(m)))

 /* __NO_INLINE__: some gcc's do not honor inlining! :( */
 #if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
 # define ALWAYS_INLINE __attribute__ ((always_inline)) inline
 /* I've seen a toolchain where I needed __noinline__ instead of noinline */
 # define NOINLINE      __attribute__((__noinline__))
 # if !ENABLE_WERROR
 #  define DEPRECATED __attribute__ ((__deprecated__))
 #  define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
 # else
 #  define DEPRECATED
 #  define UNUSED_PARAM_RESULT
 # endif
 #else
 # define ALWAYS_INLINE inline
 # define NOINLINE
 # define DEPRECATED
 # define UNUSED_PARAM_RESULT
 #endif

 /* used by unit test machinery to run registration functions before calling main() */
 #define INIT_FUNC __attribute__ ((constructor))

 /* -fwhole-program makes all symbols local. The attribute externally_visible
  * forces a symbol global.  */
 #if __GNUC_PREREQ(4,1)
 # define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
 //__attribute__ ((__externally_visible__))
 #else
 # define EXTERNALLY_VISIBLE
 #endif

 /* At 4.4 gcc become much more anal about this, need to use "aliased" types */
 #if __GNUC_PREREQ(4,4)
 # define FIX_ALIASING __attribute__((__may_alias__))
 #else
 # define FIX_ALIASING
 #endif

 /* We use __extension__ in some places to suppress -pedantic warnings
  * about GCC extensions.  This feature didn't work properly before
  * gcc 2.8.  */
 #if !__GNUC_PREREQ(2,8)
 # ifndef __extension__
 #  define __extension__
 # endif
 #endif

 /* FAST_FUNC is a qualifier which (possibly) makes function call faster
  * and/or smaller by using modified ABI. It is usually only needed
  * on non-static, busybox internal functions. Recent versions of gcc
  * optimize statics automatically. FAST_FUNC on static is required
  * only if you need to match a function pointer's type */
 #if __GNUC_PREREQ(3,0) && defined(i386) /* || defined(__x86_64__)? */
 /* stdcall makes callee to pop arguments from stack, not caller */
 # define FAST_FUNC __attribute__((regparm(3),stdcall))
 /* #elif ... - add your favorite arch today! */
 #else
 # define FAST_FUNC
 #endif

 /* Make all declarations hidden (-fvisibility flag only affects definitions) */
 /* (don't include system headers after this until corresponding pop!) */
 #if __GNUC_PREREQ(4,1) && !defined(__CYGWIN__)
 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
 # define POP_SAVED_FUNCTION_VISIBILITY              _Pragma("GCC visibility pop")
 #else
 # define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
 # define POP_SAVED_FUNCTION_VISIBILITY
 #endif

 /* gcc-2.95 had no va_copy but only __va_copy. */
 #if !__GNUC_PREREQ(3,0)
 # include <stdarg.h>
 # if !defined va_copy && defined __va_copy
 #  define va_copy(d,s) __va_copy((d),(s))
 # endif
 #endif


 /* ---- Endian Detection ------------------------------------ */

 #include <limits.h>
 #if defined(__digital__) && defined(__unix__)
 # include <sex.h>
 #elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) \
    || defined(__APPLE__)
 # include <sys/resource.h>  /* rlimit */
 # include <machine/endian.h>
 # define bswap_64 __bswap64
 # define bswap_32 __bswap32
 # define bswap_16 __bswap16
 #else
 # include <byteswap.h>
 # include <endian.h>
 #endif

 #if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
 # define BB_BIG_ENDIAN 1
 # define BB_LITTLE_ENDIAN 0
 #elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
 # define BB_BIG_ENDIAN 0
 # define BB_LITTLE_ENDIAN 1
 #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
 # define BB_BIG_ENDIAN 1
 # define BB_LITTLE_ENDIAN 0
 #elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
 # define BB_BIG_ENDIAN 0
 # define BB_LITTLE_ENDIAN 1
 #elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
 # define BB_BIG_ENDIAN 1
 # define BB_LITTLE_ENDIAN 0
 #elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
 # define BB_BIG_ENDIAN 0
 # define BB_LITTLE_ENDIAN 1
 #elif defined(__386__)
 # define BB_BIG_ENDIAN 0
 # define BB_LITTLE_ENDIAN 1
 #else
 # error "Can't determine endianness"
 #endif

 #if ULONG_MAX > 0xffffffff
 # define bb_bswap_64(x) bswap_64(x)
 #endif

 /* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
 #if BB_BIG_ENDIAN
 # define SWAP_BE16(x) (x)
 # define SWAP_BE32(x) (x)
 # define SWAP_BE64(x) (x)
 # define SWAP_LE16(x) bswap_16(x)
 # define SWAP_LE32(x) bswap_32(x)
 # define SWAP_LE64(x) bb_bswap_64(x)
 # define IF_BIG_ENDIAN(...) __VA_ARGS__
 # define IF_LITTLE_ENDIAN(...)
 #else
 # define SWAP_BE16(x) bswap_16(x)
 # define SWAP_BE32(x) bswap_32(x)
 # define SWAP_BE64(x) bb_bswap_64(x)
 # define SWAP_LE16(x) (x)
 # define SWAP_LE32(x) (x)
 # define SWAP_LE64(x) (x)
 # define IF_BIG_ENDIAN(...)
 # define IF_LITTLE_ENDIAN(...) __VA_ARGS__
 #endif


 /* ---- Unaligned access ------------------------------------ */

 #include <stdint.h>
 typedef int      bb__aliased_int      FIX_ALIASING;
 typedef long     bb__aliased_long     FIX_ALIASING;
 typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
 typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
 typedef uint64_t bb__aliased_uint64_t FIX_ALIASING;

 /* NB: unaligned parameter should be a pointer, aligned one -
  * a lvalue. This makes it more likely to not swap them by mistake
  */
 #if defined(i386) || defined(__x86_64__) || defined(__powerpc__)
 # define move_from_unaligned_int(v, intp)  ((v) = *(bb__aliased_int*)(intp))
 # define move_from_unaligned_long(v, longp) ((v) = *(bb__aliased_long*)(longp))
 # define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
 # define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
 # define move_to_unaligned16(u16p, v)   (*(bb__aliased_uint16_t*)(u16p) = (v))
 # define move_to_unaligned32(u32p, v)   (*(bb__aliased_uint32_t*)(u32p) = (v))
 /* #elif ... - add your favorite arch today! */
 #else
 /* performs reasonably well (gcc usually inlines memcpy here) */
 # define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
 # define move_from_unaligned_long(v, longp) (memcpy(&(v), (longp), sizeof(long)))
 # define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
 # define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
 # define move_to_unaligned16(u16p, v) do { \
 	uint16_t __t = (v); \
 	memcpy((u16p), &__t, 2); \
 } while (0)
 # define move_to_unaligned32(u32p, v) do { \
 	uint32_t __t = (v); \
 	memcpy((u32p), &__t, 4); \
 } while (0)
 #endif


 /* ---- Size-saving "small" ints (arch-dependent) ----------- */

 #if defined(i386) || defined(__x86_64__) || defined(__mips__) || defined(__cris__)
 /* add other arches which benefit from this... */
 typedef signed char smallint;
 typedef unsigned char smalluint;
 #else
 /* for arches where byte accesses generate larger code: */
 typedef int smallint;
 typedef unsigned smalluint;
 #endif

 /* ISO C Standard:  7.16  Boolean type and values  <stdbool.h> */
 #if (defined __digital__ && defined __unix__)
 /* old system without (proper) C99 support */
 # define bool smalluint
 #else
 /* modern system, so use it */
 # include <stdbool.h>
 #endif


 /*----- Kernel versioning ------------------------------------*/

 #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))

 #ifdef __UCLIBC__
 # define UCLIBC_VERSION KERNEL_VERSION(__UCLIBC_MAJOR__, __UCLIBC_MINOR__, __UCLIBC_SUBLEVEL__)
 #else
 # define UCLIBC_VERSION 0
 #endif


 /* ---- Miscellaneous --------------------------------------- */

 #if defined __GLIBC__ \
  || defined __UCLIBC__ \
  || defined __dietlibc__ \
  || defined __BIONIC__ \
  || defined _NEWLIB_VERSION
 # include <features.h>
 #endif

 /* Define bb_setpgrp */
 #if defined(__digital__) && defined(__unix__)
 /* use legacy setpgrp(pid_t, pid_t) for now.  move to platform.c */
 # define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
 #else
 # define bb_setpgrp() setpgrp()
 #endif

 /* fdprintf is more readable, we used it before dprintf was standardized */
 #include <unistd.h>
 #define fdprintf dprintf

 /* Useful for defeating gcc's alignment of "char message[]"-like data */
 #if !defined(__s390__)
     /* on s390[x], non-word-aligned data accesses require larger code */
 # define ALIGN1 __attribute__((aligned(1)))
 # define ALIGN2 __attribute__((aligned(2)))
 # define ALIGN4 __attribute__((aligned(4)))
 #else
 /* Arches which MUST have 2 or 4 byte alignment for everything are here */
 # define ALIGN1
 # define ALIGN2
 # define ALIGN4
 #endif

 /*
  * For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
  * For earlier versions there is no reliable way to check if we are building
  * for a mmu-less system.
  */
 #if ENABLE_NOMMU || \
     (defined __UCLIBC__ && \
      UCLIBC_VERSION > KERNEL_VERSION(0, 9, 28) && \
      !defined __ARCH_USE_MMU__)
 # define BB_MMU 0
 # define USE_FOR_NOMMU(...) __VA_ARGS__
 # define USE_FOR_MMU(...)
 #else
 # define BB_MMU 1
 # define USE_FOR_NOMMU(...)
 # define USE_FOR_MMU(...) __VA_ARGS__
 #endif

 #if defined(__digital__) && defined(__unix__)
 # include <standards.h>
 # include <inttypes.h>
 # define PRIu32 "u"
 # if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
 #  define ADJ_OFFSET_SINGLESHOT (MOD_CLKA | MOD_OFFSET)
 # endif
 # if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
 #  define ADJ_FREQUENCY MOD_FREQUENCY
 # endif
 # if !defined ADJ_TIMECONST && defined MOD_TIMECONST
 #  define ADJ_TIMECONST MOD_TIMECONST
 # endif
 # if !defined ADJ_TICK && defined MOD_CLKB
 #  define ADJ_TICK MOD_CLKB
 # endif
 #endif

 #if defined(__CYGWIN__)
 # define MAXSYMLINKS SYMLOOP_MAX
 #endif

 #if defined(ANDROID) || defined(__ANDROID__)
 # define BB_ADDITIONAL_PATH ":/system/sbin:/system/bin:/system/xbin"
 # define SYS_ioprio_set __NR_ioprio_set
 # define SYS_ioprio_get __NR_ioprio_get
 #endif


 /* ---- Who misses what? ------------------------------------ */

 /* Assume all these functions and header files exist by default.
  * Platforms where it is not true will #undef them below.
  */
 #define HAVE_CLEARENV 1
 #define HAVE_FDATASYNC 1
 #define HAVE_DPRINTF 1
 #define HAVE_MEMRCHR 1
 #define HAVE_MKDTEMP 1
 #define HAVE_PTSNAME_R 1
 #define HAVE_SETBIT 1
 #define HAVE_SIGHANDLER_T 1
 #define HAVE_STPCPY 1
 #define HAVE_STRCASESTR 1
 #define HAVE_STRCHRNUL 1
 #define HAVE_STRSEP 1
 #define HAVE_STRSIGNAL 1
 #define HAVE_STRVERSCMP 1
 #define HAVE_VASPRINTF 1
 #define HAVE_USLEEP 1
 #define HAVE_UNLOCKED_STDIO 1
 #define HAVE_UNLOCKED_LINE_OPS 1
 #define HAVE_GETLINE 1
 #define HAVE_XTABS 1
 #define HAVE_MNTENT_H 1
 #define HAVE_NET_ETHERNET_H 1
 #define HAVE_SYS_STATFS_H 1

 #if defined(__UCLIBC__)
 # if UCLIBC_VERSION < KERNEL_VERSION(0, 9, 32)
 #  undef HAVE_STRVERSCMP
 # endif
 # if UCLIBC_VERSION >= KERNEL_VERSION(0, 9, 30)
 #  ifndef __UCLIBC_SUSV3_LEGACY__
 #   undef HAVE_USLEEP
 #  endif
 # endif
 #endif

 #if defined(__WATCOMC__)
 # undef HAVE_DPRINTF
 # undef HAVE_GETLINE
 # undef HAVE_MEMRCHR
 # undef HAVE_MKDTEMP
 # undef HAVE_SETBIT
 # undef HAVE_STPCPY
 # undef HAVE_STRCASESTR
 # undef HAVE_STRCHRNUL
 # undef HAVE_STRSEP
 # undef HAVE_STRSIGNAL
 # undef HAVE_STRVERSCMP
 # undef HAVE_VASPRINTF
 # undef HAVE_UNLOCKED_STDIO
 # undef HAVE_UNLOCKED_LINE_OPS
 # undef HAVE_NET_ETHERNET_H
 #endif

 #if defined(__CYGWIN__)
 # undef HAVE_CLEARENV
 # undef HAVE_FDPRINTF
 # undef HAVE_MEMRCHR
 # undef HAVE_PTSNAME_R
 # undef HAVE_STRVERSCMP
 # undef HAVE_UNLOCKED_LINE_OPS
 #endif

 /* These BSD-derived OSes share many similarities */
 #if (defined __digital__ && defined __unix__) \
  || defined __APPLE__ \
  || defined __OpenBSD__ || defined __NetBSD__
 # undef HAVE_CLEARENV
 # undef HAVE_FDATASYNC
 # undef HAVE_GETLINE
 # undef HAVE_MNTENT_H
 # undef HAVE_PTSNAME_R
 # undef HAVE_SYS_STATFS_H
 # undef HAVE_SIGHANDLER_T
 # undef HAVE_STRVERSCMP
 # undef HAVE_XTABS
 # undef HAVE_DPRINTF
 # undef HAVE_UNLOCKED_STDIO
 # undef HAVE_UNLOCKED_LINE_OPS
 #endif

 #if defined(__dietlibc__)
 # undef HAVE_STRCHRNUL
 #endif

 #if defined(__APPLE__)
 # undef HAVE_STRCHRNUL
 #endif

 #if defined(__FreeBSD__)
 # undef HAVE_CLEARENV
 # undef HAVE_FDATASYNC
 # undef HAVE_MNTENT_H
 # undef HAVE_PTSNAME_R
 # undef HAVE_SYS_STATFS_H
 # undef HAVE_SIGHANDLER_T
 # undef HAVE_STRVERSCMP
 # undef HAVE_XTABS
 # undef HAVE_UNLOCKED_LINE_OPS
 # include <osreldate.h>
 # if __FreeBSD_version < 1000029
 #  undef HAVE_STRCHRNUL /* FreeBSD added strchrnul() between 1000028 and 1000029 */
 # endif
 #endif

 #if defined(__NetBSD__)
 # define HAVE_GETLINE 1  /* Recent NetBSD versions have getline() */
 #endif

 #if defined(__digital__) && defined(__unix__)
 # undef HAVE_STPCPY
 #endif

 #if defined(ANDROID) || defined(__ANDROID__)
 # undef HAVE_DPRINTF
 # undef HAVE_GETLINE
 # undef HAVE_STPCPY
 # undef HAVE_STRCHRNUL
 # undef HAVE_STRVERSCMP
 # undef HAVE_UNLOCKED_LINE_OPS
 # undef HAVE_NET_ETHERNET_H
 #endif

 /*
  * Now, define prototypes for all the functions defined in platform.c
  * These must come after all the HAVE_* macros are defined (or not)
  */

 #ifndef HAVE_DPRINTF
 extern int dprintf(int fd, const char *format, ...);
 #endif

 #ifndef HAVE_MEMRCHR
 extern void *memrchr(const void *s, int c, size_t n) FAST_FUNC;
 #endif

 #ifndef HAVE_MKDTEMP
 extern char *mkdtemp(char *template) FAST_FUNC;
 #endif

 #ifndef HAVE_SETBIT
 # define setbit(a, b)  ((a)[(b) >> 3] |= 1 << ((b) & 7))
 # define clrbit(a, b)  ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
 #endif

 #ifndef HAVE_SIGHANDLER_T
 typedef void (*sighandler_t)(int);
 #endif

 #ifndef HAVE_STPCPY
 extern char *stpcpy(char *p, const char *to_add) FAST_FUNC;
 #endif

 #ifndef HAVE_STRCASESTR
 extern char *strcasestr(const char *s, const char *pattern) FAST_FUNC;
 #endif

 #ifndef HAVE_STRCHRNUL
 extern char *strchrnul(const char *s, int c) FAST_FUNC;
 #endif

 #ifndef HAVE_STRSEP
 extern char *strsep(char **stringp, const char *delim) FAST_FUNC;
 #endif

 #ifndef HAVE_STRSIGNAL
 /* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
 # define strsignal(sig) get_signame(sig)
 #endif

 #ifndef HAVE_USLEEP
 extern int usleep(unsigned) FAST_FUNC;
 #endif

 #ifndef HAVE_VASPRINTF
 extern int vasprintf(char **string_ptr, const char *format, va_list p) FAST_FUNC;
 #endif

 #ifndef HAVE_GETLINE
 # include <stdio.h> /* for FILE */
 # include <sys/types.h> /* size_t */
 extern ssize_t getline(char **lineptr, size_t *n, FILE *stream) FAST_FUNC;
 #endif

 #endif
	/* vi: set sw=4 ts=4: */
	/*
	* Copyright 2006, Bernhard Reutner-Fischer
	*
	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
	*/
	#ifndef BB_PLATFORM_H
	#define BB_PLATFORM_H 1


	/* Convenience macros to test the version of gcc. */
	#undef __GNUC_PREREQ
	#if defined __GNUC__ && defined __GNUC_MINOR__
	# define __GNUC_PREREQ(maj, min) \
	((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
	#else
	# define __GNUC_PREREQ(maj, min) 0
	#endif

	/* __restrict is known in EGCS 1.2 and above. */
	#if !__GNUC_PREREQ(2,92)
	# ifndef __restrict
	# define __restrict
	# endif
	#endif

	#if !__GNUC_PREREQ(2,7)
	# ifndef __attribute__
	# define __attribute__(x)
	# endif
	#endif

	#undef inline
	#if defined(__STDC_VERSION__) && __STDC_VERSION__ > 199901L
	/* it's a keyword */
	#elif __GNUC_PREREQ(2,7)
	# define inline __inline__
	#else
	# define inline
	#endif

	#ifndef __const
	# define __const const
	#endif

	#define UNUSED_PARAM __attribute__ ((__unused__))
	#define NORETURN __attribute__ ((__noreturn__))
	/* "The malloc attribute is used to tell the compiler that a function
	* may be treated as if any non-NULL pointer it returns cannot alias
	* any other pointer valid when the function returns. This will often
	* improve optimization. Standard functions with this property include
	* malloc and calloc. realloc-like functions have this property as long
	* as the old pointer is never referred to (including comparing it
	* to the new pointer) after the function returns a non-NULL value."
	*/
	#define RETURNS_MALLOC __attribute__ ((malloc))
	#define PACKED __attribute__ ((__packed__))
	#define ALIGNED(m) __attribute__ ((__aligned__(m)))

	/* __NO_INLINE__: some gcc's do not honor inlining! :( */
	#if __GNUC_PREREQ(3,0) && !defined(__NO_INLINE__)
	# define ALWAYS_INLINE __attribute__ ((always_inline)) inline
	/* I've seen a toolchain where I needed __noinline__ instead of noinline */
	# define NOINLINE __attribute__((__noinline__))
	# if !ENABLE_WERROR
	# define DEPRECATED __attribute__ ((__deprecated__))
	# define UNUSED_PARAM_RESULT __attribute__ ((warn_unused_result))
	# else
	# define DEPRECATED
	# define UNUSED_PARAM_RESULT
	# endif
	#else
	# define ALWAYS_INLINE inline
	# define NOINLINE
	# define DEPRECATED
	# define UNUSED_PARAM_RESULT
	#endif

	/* used by unit test machinery to run registration functions before calling main() */
	#define INIT_FUNC __attribute__ ((constructor))

	/* -fwhole-program makes all symbols local. The attribute externally_visible
	* forces a symbol global. */
	#if __GNUC_PREREQ(4,1)
	# define EXTERNALLY_VISIBLE __attribute__(( visibility("default") ))
	//__attribute__ ((__externally_visible__))
	#else
	# define EXTERNALLY_VISIBLE
	#endif

	/* At 4.4 gcc become much more anal about this, need to use "aliased" types */
	#if __GNUC_PREREQ(4,4)
	# define FIX_ALIASING __attribute__((__may_alias__))
	#else
	# define FIX_ALIASING
	#endif

	/* We use __extension__ in some places to suppress -pedantic warnings
	* about GCC extensions. This feature didn't work properly before
	* gcc 2.8. */
	#if !__GNUC_PREREQ(2,8)
	# ifndef __extension__
	# define __extension__
	# endif
	#endif

	/* FAST_FUNC is a qualifier which (possibly) makes function call faster
	* and/or smaller by using modified ABI. It is usually only needed
	* on non-static, busybox internal functions. Recent versions of gcc
	* optimize statics automatically. FAST_FUNC on static is required
	* only if you need to match a function pointer's type */
	#if __GNUC_PREREQ(3,0) && defined(i386) /* \|\| defined(__x86_64__)? */
	/* stdcall makes callee to pop arguments from stack, not caller */
	# define FAST_FUNC __attribute__((regparm(3),stdcall))
	/* #elif ... - add your favorite arch today! */
	#else
	# define FAST_FUNC
	#endif

	/* Make all declarations hidden (-fvisibility flag only affects definitions) */
	/* (don't include system headers after this until corresponding pop!) */
	#if __GNUC_PREREQ(4,1) && !defined(__CYGWIN__)
	# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN _Pragma("GCC visibility push(hidden)")
	# define POP_SAVED_FUNCTION_VISIBILITY _Pragma("GCC visibility pop")
	#else
	# define PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
	# define POP_SAVED_FUNCTION_VISIBILITY
	#endif

	/* gcc-2.95 had no va_copy but only __va_copy. */
	#if !__GNUC_PREREQ(3,0)
	# include <stdarg.h>
	# if !defined va_copy && defined __va_copy
	# define va_copy(d,s) __va_copy((d),(s))
	# endif
	#endif


	/* ---- Endian Detection ------------------------------------ */

	#include <limits.h>
	#if defined(__digital__) && defined(__unix__)
	# include <sex.h>
	#elif defined(__FreeBSD__) \|\| defined(__OpenBSD__) \|\| defined(__NetBSD__) \
	\|\| defined(__APPLE__)
	# include <sys/resource.h> /* rlimit */
	# include <machine/endian.h>
	# define bswap_64 __bswap64
	# define bswap_32 __bswap32
	# define bswap_16 __bswap16
	#else
	# include <byteswap.h>
	# include <endian.h>
	#endif

	#if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
	# define BB_BIG_ENDIAN 1
	# define BB_LITTLE_ENDIAN 0
	#elif defined(__BYTE_ORDER) && __BYTE_ORDER == __LITTLE_ENDIAN
	# define BB_BIG_ENDIAN 0
	# define BB_LITTLE_ENDIAN 1
	#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _BIG_ENDIAN
	# define BB_BIG_ENDIAN 1
	# define BB_LITTLE_ENDIAN 0
	#elif defined(_BYTE_ORDER) && _BYTE_ORDER == _LITTLE_ENDIAN
	# define BB_BIG_ENDIAN 0
	# define BB_LITTLE_ENDIAN 1
	#elif defined(BYTE_ORDER) && BYTE_ORDER == BIG_ENDIAN
	# define BB_BIG_ENDIAN 1
	# define BB_LITTLE_ENDIAN 0
	#elif defined(BYTE_ORDER) && BYTE_ORDER == LITTLE_ENDIAN
	# define BB_BIG_ENDIAN 0
	# define BB_LITTLE_ENDIAN 1
	#elif defined(__386__)
	# define BB_BIG_ENDIAN 0
	# define BB_LITTLE_ENDIAN 1
	#else
	# error "Can't determine endianness"
	#endif

	#if ULONG_MAX > 0xffffffff
	# define bb_bswap_64(x) bswap_64(x)
	#endif

	/* SWAP_LEnn means "convert CPU<->little_endian by swapping bytes" */
	#if BB_BIG_ENDIAN
	# define SWAP_BE16(x) (x)
	# define SWAP_BE32(x) (x)
	# define SWAP_BE64(x) (x)
	# define SWAP_LE16(x) bswap_16(x)
	# define SWAP_LE32(x) bswap_32(x)
	# define SWAP_LE64(x) bb_bswap_64(x)
	# define IF_BIG_ENDIAN(...) __VA_ARGS__
	# define IF_LITTLE_ENDIAN(...)
	#else
	# define SWAP_BE16(x) bswap_16(x)
	# define SWAP_BE32(x) bswap_32(x)
	# define SWAP_BE64(x) bb_bswap_64(x)
	# define SWAP_LE16(x) (x)
	# define SWAP_LE32(x) (x)
	# define SWAP_LE64(x) (x)
	# define IF_BIG_ENDIAN(...)
	# define IF_LITTLE_ENDIAN(...) __VA_ARGS__
	#endif


	/* ---- Unaligned access ------------------------------------ */

	#include <stdint.h>
	typedef int bb__aliased_int FIX_ALIASING;
	typedef long bb__aliased_long FIX_ALIASING;
	typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
	typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
	typedef uint64_t bb__aliased_uint64_t FIX_ALIASING;

	/* NB: unaligned parameter should be a pointer, aligned one -
	* a lvalue. This makes it more likely to not swap them by mistake
	*/
	#if defined(i386) \|\| defined(__x86_64__) \|\| defined(__powerpc__)
	# define move_from_unaligned_int(v, intp) ((v) = (bb__aliased_int)(intp))
	# define move_from_unaligned_long(v, longp) ((v) = (bb__aliased_long)(longp))
	# define move_from_unaligned16(v, u16p) ((v) = (bb__aliased_uint16_t)(u16p))
	# define move_from_unaligned32(v, u32p) ((v) = (bb__aliased_uint32_t)(u32p))
	# define move_to_unaligned16(u16p, v) ((bb__aliased_uint16_t)(u16p) = (v))
	# define move_to_unaligned32(u32p, v) ((bb__aliased_uint32_t)(u32p) = (v))
	/* #elif ... - add your favorite arch today! */
	#else
	/* performs reasonably well (gcc usually inlines memcpy here) */
	# define move_from_unaligned_int(v, intp) (memcpy(&(v), (intp), sizeof(int)))
	# define move_from_unaligned_long(v, longp) (memcpy(&(v), (longp), sizeof(long)))
	# define move_from_unaligned16(v, u16p) (memcpy(&(v), (u16p), 2))
	# define move_from_unaligned32(v, u32p) (memcpy(&(v), (u32p), 4))
	# define move_to_unaligned16(u16p, v) do { \
	uint16_t __t = (v); \
	memcpy((u16p), &__t, 2); \
	} while (0)
	# define move_to_unaligned32(u32p, v) do { \
	uint32_t __t = (v); \
	memcpy((u32p), &__t, 4); \
	} while (0)
	#endif


	/* ---- Size-saving "small" ints (arch-dependent) ----------- */

	#if defined(i386) \|\| defined(__x86_64__) \|\| defined(__mips__) \|\| defined(__cris__)
	/* add other arches which benefit from this... */
	typedef signed char smallint;
	typedef unsigned char smalluint;
	#else
	/* for arches where byte accesses generate larger code: */
	typedef int smallint;
	typedef unsigned smalluint;
	#endif

	/* ISO C Standard: 7.16 Boolean type and values <stdbool.h> */
	#if (defined __digital__ && defined __unix__)
	/* old system without (proper) C99 support */
	# define bool smalluint
	#else
	/* modern system, so use it */
	# include <stdbool.h>
	#endif


	/----- Kernel versioning ------------------------------------/

	#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))

	#ifdef __UCLIBC__
	# define UCLIBC_VERSION KERNEL_VERSION(__UCLIBC_MAJOR__, __UCLIBC_MINOR__, __UCLIBC_SUBLEVEL__)
	#else
	# define UCLIBC_VERSION 0
	#endif


	/* ---- Miscellaneous --------------------------------------- */

	#if defined __GLIBC__ \
	\|\| defined __UCLIBC__ \
	\|\| defined __dietlibc__ \
	\|\| defined __BIONIC__ \
	\|\| defined _NEWLIB_VERSION
	# include <features.h>
	#endif

	/* Define bb_setpgrp */
	#if defined(__digital__) && defined(__unix__)
	/* use legacy setpgrp(pid_t, pid_t) for now. move to platform.c */
	# define bb_setpgrp() do { pid_t __me = getpid(); setpgrp(__me, __me); } while (0)
	#else
	# define bb_setpgrp() setpgrp()
	#endif

	/* fdprintf is more readable, we used it before dprintf was standardized */
	#include <unistd.h>
	#define fdprintf dprintf

	/* Useful for defeating gcc's alignment of "char message[]"-like data */
	#if !defined(__s390__)
	/* on s390[x], non-word-aligned data accesses require larger code */
	# define ALIGN1 __attribute__((aligned(1)))
	# define ALIGN2 __attribute__((aligned(2)))
	# define ALIGN4 __attribute__((aligned(4)))
	#else
	/* Arches which MUST have 2 or 4 byte alignment for everything are here */
	# define ALIGN1
	# define ALIGN2
	# define ALIGN4
	#endif

	/*
	* For 0.9.29 and svn, __ARCH_USE_MMU__ indicates no-mmu reliably.
	* For earlier versions there is no reliable way to check if we are building
	* for a mmu-less system.
	*/
	#if ENABLE_NOMMU \|\| \
	(defined __UCLIBC__ && \
	UCLIBC_VERSION > KERNEL_VERSION(0, 9, 28) && \
	!defined __ARCH_USE_MMU__)
	# define BB_MMU 0
	# define USE_FOR_NOMMU(...) __VA_ARGS__
	# define USE_FOR_MMU(...)
	#else
	# define BB_MMU 1
	# define USE_FOR_NOMMU(...)
	# define USE_FOR_MMU(...) __VA_ARGS__
	#endif

	#if defined(__digital__) && defined(__unix__)
	# include <standards.h>
	# include <inttypes.h>
	# define PRIu32 "u"
	# if !defined ADJ_OFFSET_SINGLESHOT && defined MOD_CLKA && defined MOD_OFFSET
	# define ADJ_OFFSET_SINGLESHOT (MOD_CLKA \| MOD_OFFSET)
	# endif
	# if !defined ADJ_FREQUENCY && defined MOD_FREQUENCY
	# define ADJ_FREQUENCY MOD_FREQUENCY
	# endif
	# if !defined ADJ_TIMECONST && defined MOD_TIMECONST
	# define ADJ_TIMECONST MOD_TIMECONST
	# endif
	# if !defined ADJ_TICK && defined MOD_CLKB
	# define ADJ_TICK MOD_CLKB
	# endif
	#endif

	#if defined(__CYGWIN__)
	# define MAXSYMLINKS SYMLOOP_MAX
	#endif

	#if defined(ANDROID) \|\| defined(__ANDROID__)
	# define BB_ADDITIONAL_PATH ":/system/sbin:/system/bin:/system/xbin"
	# define SYS_ioprio_set __NR_ioprio_set
	# define SYS_ioprio_get __NR_ioprio_get
	#endif


	/* ---- Who misses what? ------------------------------------ */

	/* Assume all these functions and header files exist by default.
	* Platforms where it is not true will #undef them below.
	*/
	#define HAVE_CLEARENV 1
	#define HAVE_FDATASYNC 1
	#define HAVE_DPRINTF 1
	#define HAVE_MEMRCHR 1
	#define HAVE_MKDTEMP 1
	#define HAVE_PTSNAME_R 1
	#define HAVE_SETBIT 1
	#define HAVE_SIGHANDLER_T 1
	#define HAVE_STPCPY 1
	#define HAVE_STRCASESTR 1
	#define HAVE_STRCHRNUL 1
	#define HAVE_STRSEP 1
	#define HAVE_STRSIGNAL 1
	#define HAVE_STRVERSCMP 1
	#define HAVE_VASPRINTF 1
	#define HAVE_USLEEP 1
	#define HAVE_UNLOCKED_STDIO 1
	#define HAVE_UNLOCKED_LINE_OPS 1
	#define HAVE_GETLINE 1
	#define HAVE_XTABS 1
	#define HAVE_MNTENT_H 1
	#define HAVE_NET_ETHERNET_H 1
	#define HAVE_SYS_STATFS_H 1

	#if defined(__UCLIBC__)
	# if UCLIBC_VERSION < KERNEL_VERSION(0, 9, 32)
	# undef HAVE_STRVERSCMP
	# endif
	# if UCLIBC_VERSION >= KERNEL_VERSION(0, 9, 30)
	# ifndef __UCLIBC_SUSV3_LEGACY__
	# undef HAVE_USLEEP
	# endif
	# endif
	#endif

	#if defined(__WATCOMC__)
	# undef HAVE_DPRINTF
	# undef HAVE_GETLINE
	# undef HAVE_MEMRCHR
	# undef HAVE_MKDTEMP
	# undef HAVE_SETBIT
	# undef HAVE_STPCPY
	# undef HAVE_STRCASESTR
	# undef HAVE_STRCHRNUL
	# undef HAVE_STRSEP
	# undef HAVE_STRSIGNAL
	# undef HAVE_STRVERSCMP
	# undef HAVE_VASPRINTF
	# undef HAVE_UNLOCKED_STDIO
	# undef HAVE_UNLOCKED_LINE_OPS
	# undef HAVE_NET_ETHERNET_H
	#endif

	#if defined(__CYGWIN__)
	# undef HAVE_CLEARENV
	# undef HAVE_FDPRINTF
	# undef HAVE_MEMRCHR
	# undef HAVE_PTSNAME_R
	# undef HAVE_STRVERSCMP
	# undef HAVE_UNLOCKED_LINE_OPS
	#endif

	/* These BSD-derived OSes share many similarities */
	#if (defined __digital__ && defined __unix__) \
	\|\| defined __APPLE__ \
	\|\| defined __OpenBSD__ \|\| defined __NetBSD__
	# undef HAVE_CLEARENV
	# undef HAVE_FDATASYNC
	# undef HAVE_GETLINE
	# undef HAVE_MNTENT_H
	# undef HAVE_PTSNAME_R
	# undef HAVE_SYS_STATFS_H
	# undef HAVE_SIGHANDLER_T
	# undef HAVE_STRVERSCMP
	# undef HAVE_XTABS
	# undef HAVE_DPRINTF
	# undef HAVE_UNLOCKED_STDIO
	# undef HAVE_UNLOCKED_LINE_OPS
	#endif

	#if defined(__dietlibc__)
	# undef HAVE_STRCHRNUL
	#endif

	#if defined(__APPLE__)
	# undef HAVE_STRCHRNUL
	#endif

	#if defined(__FreeBSD__)
	# undef HAVE_CLEARENV
	# undef HAVE_FDATASYNC
	# undef HAVE_MNTENT_H
	# undef HAVE_PTSNAME_R
	# undef HAVE_SYS_STATFS_H
	# undef HAVE_SIGHANDLER_T
	# undef HAVE_STRVERSCMP
	# undef HAVE_XTABS
	# undef HAVE_UNLOCKED_LINE_OPS
	# include <osreldate.h>
	# if __FreeBSD_version < 1000029
	# undef HAVE_STRCHRNUL /* FreeBSD added strchrnul() between 1000028 and 1000029 */
	# endif
	#endif

	#if defined(__NetBSD__)
	# define HAVE_GETLINE 1 /* Recent NetBSD versions have getline() */
	#endif

	#if defined(__digital__) && defined(__unix__)
	# undef HAVE_STPCPY
	#endif

	#if defined(ANDROID) \|\| defined(__ANDROID__)
	# undef HAVE_DPRINTF
	# undef HAVE_GETLINE
	# undef HAVE_STPCPY
	# undef HAVE_STRCHRNUL
	# undef HAVE_STRVERSCMP
	# undef HAVE_UNLOCKED_LINE_OPS
	# undef HAVE_NET_ETHERNET_H
	#endif

	/*
	* Now, define prototypes for all the functions defined in platform.c
	* These must come after all the HAVE_* macros are defined (or not)
	*/

	#ifndef HAVE_DPRINTF
	extern int dprintf(int fd, const char *format, ...);
	#endif

	#ifndef HAVE_MEMRCHR
	extern void memrchr(const void s, int c, size_t n) FAST_FUNC;
	#endif

	#ifndef HAVE_MKDTEMP
	extern char mkdtemp(char template) FAST_FUNC;
	#endif

	#ifndef HAVE_SETBIT
	# define setbit(a, b) ((a)[(b) >> 3] \|= 1 << ((b) & 7))
	# define clrbit(a, b) ((a)[(b) >> 3] &= ~(1 << ((b) & 7)))
	#endif

	#ifndef HAVE_SIGHANDLER_T
	typedef void (*sighandler_t)(int);
	#endif

	#ifndef HAVE_STPCPY
	extern char stpcpy(char p, const char *to_add) FAST_FUNC;
	#endif

	#ifndef HAVE_STRCASESTR
	extern char strcasestr(const char s, const char *pattern) FAST_FUNC;
	#endif

	#ifndef HAVE_STRCHRNUL
	extern char strchrnul(const char s, int c) FAST_FUNC;
	#endif

	#ifndef HAVE_STRSEP
	extern char strsep(char stringp, const char delim) FAST_FUNC;
	#endif

	#ifndef HAVE_STRSIGNAL
	/* Not exactly the same: instead of "Stopped" it shows "STOP" etc */
	# define strsignal(sig) get_signame(sig)
	#endif

	#ifndef HAVE_USLEEP
	extern int usleep(unsigned) FAST_FUNC;
	#endif

	#ifndef HAVE_VASPRINTF
	extern int vasprintf(char *string_ptr, const char format, va_list p) FAST_FUNC;
	#endif

	#ifndef HAVE_GETLINE
	# include <stdio.h> /* for FILE */
	# include <sys/types.h> /* size_t */
	extern ssize_t getline(char *lineptr, size_t n, FILE *stream) FAST_FUNC;
	#endif

	#endif