/*  * 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 <sys/types.h>#include <unistd.h>#include <string.h> /* bsd extensions */#include <sys/uio.h>#include <sys/socket.h> #include "priv.h" intwritev(int fd, struct iovec *v, int ent){	int i, n, written;	char *t, *e, *f;	char buf[10*1024]; 	written = 0;	t = buf;	e = buf+sizeof(buf);	for(;ent ; v++, ent--){		n = v->iov_len;		f = v->iov_base;		while(n > 0){			i = e-t;			if(n < i){				memmove(t, f, n);				t += n;				break;			}			memmove(t, f, i);			n -= i;			f += i;			i = write(fd, buf, sizeof(buf));			if(i < 0){				if(written > 0){					return written;				}else{					_syserrno();					return -1;				}			}			written += i;			if(i != sizeof(buf)) {				return written;			}			t = buf;		}	}	i = t - buf;	if(i > 0){		n = write(fd, buf, i);		if(n < 0){			if(written == 0){				_syserrno();				return -1;			}		} else			written += n;	}	return written;}