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86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
/* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <sys/types.h>
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#include <endian.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include "kernel-features.h"
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#ifdef __NR_truncate64
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#ifndef __ASSUME_TRUNCATE64_SYSCALL
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/* The variable is shared between all wrappers around *truncate64 calls. */
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int __have_no_truncate64;
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#endif
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/* The order of hight, low depends on endianness. */
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extern int __syscall_truncate64 (const char *path, int dummy,
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int high_length, int low_length);
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/* Truncate the file FD refers to to LENGTH bytes. */
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int
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truncate64 (const char *path, off64_t length)
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{
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#ifndef __ASSUME_TRUNCATE64_SYSCALL
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if (! __have_no_truncate64)
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#endif
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{
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unsigned int low = length & 0xffffffff;
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unsigned int high = length >> 32;
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#ifndef __ASSUME_TRUNCATE64_SYSCALL
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int saved_errno = errno;
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#endif
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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/* Use a fill argument to pass low, high in an aligned pair of
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arguments (here 2/3). */
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int result = INLINE_SYSCALL (truncate64, 3, path, 0, low, high);
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#elif __BYTE_ORDER == __BIG_ENDIAN
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int result = INLINE_SYSCALL (truncate64, 3, path, 0, high, low);
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#endif
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#ifndef __ASSUME_TRUNCATE64_SYSCALL
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if (result != -1 || errno != ENOSYS)
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#endif
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return result;
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#ifndef __ASSUME_TRUNCATE64_SYSCALL
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__set_errno (saved_errno);
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__have_no_truncate64 = 1;
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#endif
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}
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#ifndef __ASSUME_TRUNCATE64_SYSCALL
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if ((off_t) length != length)
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{
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__set_errno (EINVAL);
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return -1;
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}
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return truncate (path, (off_t) length);
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#endif
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}
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#else
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/* Use the generic implementation. */
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# include <sysdeps/generic/truncate64.c>
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#endif
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