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77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
/* Copyright (C) 1997,1998,1999,2000,2001,2003,2005,2006,2011
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sys/types.h>
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#include <errno.h>
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#include <endian.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_ftruncate64
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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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extern int __have_no_truncate64;
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#endif
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/* Truncate the file referenced by FD to LENGTH bytes. */
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int
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__ftruncate64 (int fd, 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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int result = INLINE_SYSCALL (ftruncate64, 3, fd,
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__LONG_LONG_PAIR (high, low));
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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 __ftruncate (fd, (off_t) length);
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#endif
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}
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weak_alias (__ftruncate64, ftruncate64)
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#else
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/* Use the generic implementation. */
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# include <misc/ftruncate64.c>
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#endif
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