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- /*
- * truncate64 syscall. Copes with 64 bit and 32 bit machines
- * and on 32 bit machines this sends things into the kernel as
- * two 32-bit arguments (high and low 32 bits of length) that
- * are ordered based on endianess. It turns out endian.h has
- * just the macro we need to order things, __LONG_LONG_PAIR.
- *
- * Copyright (C) 2002 Erik Andersen <andersen@codepoet.org>
- *
- * This file is subject to the terms and conditions of the GNU
- * Lesser General Public License. See the file COPYING.LIB in
- * the main directory of this archive for more details.
- */
- #include <features.h>
- #include <unistd.h>
- #include <errno.h>
- #include <endian.h>
- #include <stdint.h>
- #include <sys/syscall.h>
- #if defined __UCLIBC_HAS_LFS__ && defined __NR_truncate64
- #ifndef INLINE_SYSCALL
- #define INLINE_SYSCALL(name, nr, args...) __syscall_truncate64 (args)
- #define __NR___syscall_truncate64 __NR_truncate64
- static inline _syscall3(int, __syscall_truncate64, const char *, path, int, high_length, int, low_length);
- #endif
- #if __WORDSIZE == 64
- /* For a 64 bit machine, life is simple... */
- _syscall2(int, truncate64, const char *, path, __off64_t, length);
- #elif __WORDSIZE == 32
- /* The exported truncate64 function. */
- int truncate64 (const char * path, __off64_t length)
- {
- uint32_t low = length & 0xffffffff;
- uint32_t high = length >> 32;
- return INLINE_SYSCALL(truncate64, 3, path, __LONG_LONG_PAIR (high, low));
- }
- #else
- #error Your machine is not 64 bit or 32 bit, I am dazed and confused.
- #endif
- #endif /* __UCLIBC_HAS_LFS__ */
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