/* * 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_HAS_LFS__ #if defined __NR_ftruncate64 #if __WORDSIZE == 64 || (defined(__powerpc__) && defined (__UCLIBC_HAS_LFS__)) /* For a 64 bit machine, life is simple... */ _syscall2(int, ftruncate64, int, fd, __off64_t, length); #elif __WORDSIZE == 32 #ifndef INLINE_SYSCALL #define INLINE_SYSCALL(name, nr, args...) __syscall_ftruncate64 (args) #define __NR___syscall_ftruncate64 __NR_ftruncate64 static inline _syscall3(int, __syscall_ftruncate64, int, fd, int, high_length, int, low_length); #endif /* The exported ftruncate64 function. */ int ftruncate64 (int fd, __off64_t length) { uint32_t low = length & 0xffffffff; uint32_t high = length >> 32; return INLINE_SYSCALL(ftruncate64, 3, fd, __LONG_LONG_PAIR (high, low)); } #else /* __WORDSIZE */ #error Your machine is not 64 bit or 32 bit, I am dazed and confused. #endif /* __WORDSIZE */ #else /* __NR_ftruncate64 */ int ftruncate64 (int fd, __off64_t length) { __off_t x = (__off_t) length; if (x == length) { return ftruncate(fd, x); } __set_errno((x < 0) ? EINVAL : EFBIG); return -1; } #endif /* __NR_ftruncate64 */ #endif /* __UCLIBC_HAS_LFS__ */