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