libc/sys/truncate.c

1.8  christos /*	$NetBSD: truncate.c,v 1.8 1997/07/13 20:25:34 christos Exp $	*/
1.3       cgd
1.2       cgd /*
1.2       cgd  * Copyright (c) 1992, 1993
1.2       cgd  *	The Regents of the University of California.  All rights reserved.
1.2       cgd  *
1.2       cgd  * Redistribution and use in source and binary forms, with or without
1.2       cgd  * modification, are permitted provided that the following conditions
1.2       cgd  * are met:
1.2       cgd  * 1. Redistributions of source code must retain the above copyright
1.2       cgd  *    notice, this list of conditions and the following disclaimer.
1.2       cgd  * 2. Redistributions in binary form must reproduce the above copyright
1.2       cgd  *    notice, this list of conditions and the following disclaimer in the
1.2       cgd  *    documentation and/or other materials provided with the distribution.
1.2       cgd  * 3. All advertising materials mentioning features or use of this software
1.2       cgd  *    must display the following acknowledgement:
1.2       cgd  *	This product includes software developed by the University of
1.2       cgd  *	California, Berkeley and its contributors.
1.2       cgd  * 4. Neither the name of the University nor the names of its contributors
1.2       cgd  *    may be used to endorse or promote products derived from this software
1.2       cgd  *    without specific prior written permission.
1.2       cgd  *
1.2       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1.2       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.2       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.2       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1.2       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1.2       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1.2       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1.2       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1.2       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1.2       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1.2       cgd  * SUCH DAMAGE.
1.2       cgd  */
1.2       cgd
1.8  christos #include <sys/cdefs.h>
1.2       cgd #if defined(LIBC_SCCS) && !defined(lint)
1.3       cgd #if 0
1.3       cgd static char sccsid[] = "@(#)truncate.c	8.1 (Berkeley) 6/17/93";
1.3       cgd #else
1.8  christos __RCSID("$NetBSD: truncate.c,v 1.8 1997/07/13 20:25:34 christos Exp $");
1.3       cgd #endif
1.2       cgd #endif /* LIBC_SCCS and not lint */
1.1       cgd
1.1       cgd #include <sys/types.h>
1.1       cgd #include <sys/syscall.h>
1.5       cgd #include <unistd.h>
1.1       cgd
1.2       cgd /*
1.2       cgd  * This function provides 64-bit offset padding that
1.2       cgd  * is not supplied by GCC 1.X but is supplied by GCC 2.X.
1.2       cgd  */
1.1       cgd int
1.1       cgd truncate(path, length)
1.4       jtc 	const char *path;
1.4       jtc 	off_t length;
1.1       cgd {
1.7       cgd 	quad_t q;
1.7       cgd 	int rv;
1.1       cgd
1.7       cgd 	q = __syscall((quad_t)SYS_truncate, path, 0, length);
1.7       cgd 	if (sizeof (quad_t) == sizeof (register_t) ||
1.7       cgd 	    BYTE_ORDER == LITTLE_ENDIAN)
1.7       cgd 		rv = (int)q;
1.7       cgd 	else
1.7       cgd 		rv = (int)(q >> 32);
1.7       cgd 	return rv;
1.1       cgd }