/* * 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_HAVE_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_HAVE_LFS__ */