ftruncate.c revision 1.11 
1/*	$NetBSD: ftruncate.c,v 1.11 2003/08/07 16:43:57 agc Exp $	*/
2
3/*
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#if defined(LIBC_SCCS) && !defined(lint)
34#if 0
35static char sccsid[] = "@(#)ftruncate.c	8.1 (Berkeley) 6/17/93";
36#else
37__RCSID("$NetBSD: ftruncate.c,v 1.11 2003/08/07 16:43:57 agc Exp $");
38#endif
39#endif /* LIBC_SCCS and not lint */
40
41#include "namespace.h"
42#include <sys/types.h>
43#include <sys/syscall.h>
44#include <unistd.h>
45
46#ifdef __weak_alias
47__weak_alias(ftruncate,_ftruncate)
48#endif
49
50/*
51 * This function provides 64-bit offset padding that
52 * is not supplied by GCC 1.X but is supplied by GCC 2.X.
53 */
54int
55ftruncate(fd, length)
56	int	fd;
57	off_t	length;
58{
59	quad_t q;
60	int rv;
61
62	q = __syscall((quad_t)SYS_ftruncate, fd, 0, length);
63	if (/* LINTED constant */ sizeof (quad_t) == sizeof (register_t) ||
64	    /* LINTED constant */ BYTE_ORDER == LITTLE_ENDIAN)
65		rv = (int)q;
66	else
67		rv = (int)((u_quad_t)q >> 32);
68	return rv;
69}
70