/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <unistd.h>#include <string.h>#include <sys/uio.h> intreadv(int fd, struct iovec *v, int ent){	int x, i, n, len;	char buf[10*1024]; 	for(len = i = 0; i < ent; i++)		len += v[i].iov_len;	if(len > sizeof(buf))		len = sizeof(buf); 	len = read(fd, buf, len);	if(len <= 0)		return len; 	for(n = i = 0; n < len && i < ent; i++){		x = len - n;		if(x > v[i].iov_len)			x = v[i].iov_len;		memmove(v[i].iov_base, buf + n, x);		n += x;	} 	return len;}