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truncate.c revision 1.7 
      1  1.7  cgd /*	$NetBSD: truncate.c,v 1.7 1996/12/23 03:00:28 cgd Exp $	*/
      2  1.3  cgd 
      3  1.2  cgd /*
      4  1.2  cgd  * Copyright (c) 1992, 1993
      5  1.2  cgd  *	The Regents of the University of California.  All rights reserved.
      6  1.2  cgd  *
      7  1.2  cgd  * Redistribution and use in source and binary forms, with or without
      8  1.2  cgd  * modification, are permitted provided that the following conditions
      9  1.2  cgd  * are met:
     10  1.2  cgd  * 1. Redistributions of source code must retain the above copyright
     11  1.2  cgd  *    notice, this list of conditions and the following disclaimer.
     12  1.2  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     13  1.2  cgd  *    notice, this list of conditions and the following disclaimer in the
     14  1.2  cgd  *    documentation and/or other materials provided with the distribution.
     15  1.2  cgd  * 3. All advertising materials mentioning features or use of this software
     16  1.2  cgd  *    must display the following acknowledgement:
     17  1.2  cgd  *	This product includes software developed by the University of
     18  1.2  cgd  *	California, Berkeley and its contributors.
     19  1.2  cgd  * 4. Neither the name of the University nor the names of its contributors
     20  1.2  cgd  *    may be used to endorse or promote products derived from this software
     21  1.2  cgd  *    without specific prior written permission.
     22  1.2  cgd  *
     23  1.2  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  1.2  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  1.2  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  1.2  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  1.2  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  1.2  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  1.2  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  1.2  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  1.2  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  1.2  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  1.2  cgd  * SUCH DAMAGE.
     34  1.2  cgd  */
     35  1.2  cgd 
     36  1.2  cgd #if defined(LIBC_SCCS) && !defined(lint)
     37  1.3  cgd #if 0
     38  1.3  cgd static char sccsid[] = "@(#)truncate.c	8.1 (Berkeley) 6/17/93";
     39  1.3  cgd #else
     40  1.7  cgd static char rcsid[] = "$NetBSD: truncate.c,v 1.7 1996/12/23 03:00:28 cgd Exp $";
     41  1.3  cgd #endif
     42  1.2  cgd #endif /* LIBC_SCCS and not lint */
     43  1.1  cgd 
     44  1.1  cgd #include <sys/types.h>
     45  1.1  cgd #include <sys/syscall.h>
     46  1.5  cgd #include <unistd.h>
     47  1.1  cgd 
     48  1.2  cgd /*
     49  1.2  cgd  * This function provides 64-bit offset padding that
     50  1.2  cgd  * is not supplied by GCC 1.X but is supplied by GCC 2.X.
     51  1.2  cgd  */
     52  1.1  cgd int
     53  1.1  cgd truncate(path, length)
     54  1.4  jtc 	const char *path;
     55  1.4  jtc 	off_t length;
     56  1.1  cgd {
     57  1.7  cgd 	quad_t q;
     58  1.7  cgd 	int rv;
     59  1.1  cgd 
     60  1.7  cgd 	q = __syscall((quad_t)SYS_truncate, path, 0, length);
     61  1.7  cgd 	if (sizeof (quad_t) == sizeof (register_t) ||
     62  1.7  cgd 	    BYTE_ORDER == LITTLE_ENDIAN)
     63  1.7  cgd 		rv = (int)q;
     64  1.7  cgd 	else
     65  1.7  cgd 		rv = (int)(q >> 32);
     66  1.7  cgd 	return rv;
     67  1.1  cgd }
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