/* * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. * * 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. */ #include <_lfs_64.h> #include <sys/syscall.h> #include <unistd.h> #ifdef __NR_ftruncate64 # include <bits/wordsize.h> # if __WORDSIZE == 64 /* For a 64 bit machine, life is simple... */ _syscall2(int, ftruncate64, int, fd, __off64_t, length) # elif __WORDSIZE == 32 # include <endian.h> # include <stdint.h> /* The exported ftruncate64 function. */ int ftruncate64 (int fd, __off64_t length) { uint32_t low = length & 0xffffffff; uint32_t high = length >> 32; # if defined(__UCLIBC_TRUNCATE64_HAS_4_ARGS__) return INLINE_SYSCALL(ftruncate64, 4, fd, 0, __LONG_LONG_PAIR (high, low)); # else return INLINE_SYSCALL(ftruncate64, 3, fd, __LONG_LONG_PAIR (high, low)); # endif } # else /* __WORDSIZE */ # error Your machine is not 64 bit or 32 bit, I am dazed and confused. # endif /* __WORDSIZE */ #else /* __NR_ftruncate64 */ # include <errno.h> 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 */ libc_hidden_def(ftruncate64)