From afd68fb2013457640f585433c07950d15400f376 Mon Sep 17 00:00:00 2001 From: Eric Andersen Date: Tue, 9 Apr 2002 14:55:49 +0000 Subject: Create a much more careful ftruncate64 implementation, that should address all the concern Miles had with the earlier versions... -Erik --- libc/sysdeps/linux/common/ftruncate64.c | 39 +++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 libc/sysdeps/linux/common/ftruncate64.c (limited to 'libc/sysdeps/linux/common/ftruncate64.c') diff --git a/libc/sysdeps/linux/common/ftruncate64.c b/libc/sysdeps/linux/common/ftruncate64.c new file mode 100644 index 000000000..0b87eb58a --- /dev/null +++ b/libc/sysdeps/linux/common/ftruncate64.c @@ -0,0 +1,39 @@ +/* + * 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 + * + * 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 +#include +#include +#include +#include +#include + +#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, int, high_length, int, low_length); +/* The exported ftruncate64 function. */ +int ftruncate64 (int fd, __off64_t length) +{ + unsigned int low = length & 0xffffffff; + unsigned int 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__ */ -- cgit v1.2.3