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- /*
- * ftruncate64 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_HAVE_LFS__ && defined __NR_ftruncate64
- #if __WORDSIZE == 64
- /* For a 64 bit machine, life is simple... */
- _syscall2(int, ftruncate64, int, fd, __off64_t, length);
- #elif __WORDSIZE == 32
- #define __NR___ftruncate64 __NR_ftruncate64
- static inline _syscall3(int, __ftruncate64, int, fd,
- uint32_t, length_first_half,
- uint32_t, length_second_half);
- /* The exported ftruncate64 function. */
- int ftruncate64 (int fd, __off64_t length)
- {
- uint32_t low = length & 0xffffffff;
- uint32_t high = length >> 32;
- return __ftruncate64(fd, __LONG_LONG_PAIR (high, low));
- }
- #else
- #error Your machine is not 64 bit or 32 bit, I am dazed and confused.
- #endif
- #endif /* __UCLIBC_HAVE_LFS__ */
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