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86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
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/* ==== readv.c ============================================================
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* Copyright (c) 1995 by Chris Provenzano, proven@mit.edu
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Chris Provenzano.
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* 4. The name of Chris Provenzano may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Description : Implementation of readv().
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*
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* 1.00 95/06/19 proven
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* -Started coding this file.
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*/
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#ifndef lint
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static const char rcsid[] = "$Id$";
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#endif
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#include "config.h"
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#ifndef HAVE_SYSCALL_READV
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#include <errno.h>
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#include <unistd.h>
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#include <sys/uio.h>
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#include <sys/types.h>
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/* ==========================================================================
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* machdep_sys_readv()
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*/
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int machdep_sys_readv(int fd, struct iovec * vector, int count)
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{
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size_t bytes, i;
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char *buffer;
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int ret = 0;
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/* Find the total number of bytes to be read. */
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for (bytes = 0, i = 0; i < count; ++i)
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bytes += vector[i].iov_len;
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if (bytes) {
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/*
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* Allocate a temporary buffer to hold the data.
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* Don't use alloca because threads tend to have smaller stacks.
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*/
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if ((buffer = (char *)malloc(bytes)) == NULL) {
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return(-ENOMEM);
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}
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ret = (int)machdep_sys_read(fd, buffer, bytes);
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/* Copy the data from memory specified by VECTOR to BUFFER */
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for (i = 0, bytes = 0; ret > 0; ret -= vector[i].iov_len) {
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memcpy(vector[i].iov_base, buffer + bytes,
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ret > vector[i].iov_len ? vector[i].iov_len : ret);
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bytes += vector[i].iov_len;
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}
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free(buffer);
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}
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return(ret);
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}
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#endif
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