rem: count = select(maxfd + 1, &r_fds, io_filesfrom_buflen? &w_fds : NULL, NULL, &tv);
add: count = select(maxfd + 1, &r_fds, &w_fds, NULL, &tv);
context: static int read_timeout(int fd, char *buf, size_t len){	int n, ret = 0;	io_flush(NORMAL_FLUSH);	while (ret == 0) {		/* until we manage to read *something* */		fd_set r_fds, w_fds;		struct timeval tv;		int maxfd = fd;		int count;		FD_ZERO(&r_fds);		FD_SET(fd, &r_fds);		if (msg_fd_in >= 0) {			FD_SET(msg_fd_in, &r_fds);			if (msg_fd_in > maxfd)				maxfd = msg_fd_in;		} else if (msg_list_head) {			FD_SET(msg_fd_out, &w_fds);			if (msg_fd_out > maxfd)				maxfd = msg_fd_out;		}		if (io_filesfrom_f_out >= 0) {			int new_fd;			if (io_filesfrom_buflen == 0) {				if (io_filesfrom_f_in >= 0) {					FD_SET(io_filesfrom_f_in, &r_fds);					new_fd = io_filesfrom_f_in;				} else {					io_filesfrom_f_out = -1;					new_fd = -1;				}			} else {				FD_ZERO(&w_fds);				FD_SET(io_filesfrom_f_out, &w_fds);				new_fd = io_filesfrom_f_out;			}			if (new_fd > maxfd)				maxfd = new_fd;		}		tv.tv_sec = select_timeout;		tv.tv_usec = 0;		errno = 0;		count = select(maxfd + 1, &r_fds,			       io_filesfrom_buflen? &w_fds : NULL,			       NULL, &tv);		if (count <= 0) {			if (errno == EBADF)				exit_cleanup(RERR_SOCKETIO);			check_timeout();			continue;		}		if (msg_fd_in >= 0 && FD_ISSET(msg_fd_in, &r_fds))			read_msg_fd();		else if (msg_list_head && FD_ISSET(msg_fd_out, &w_fds))			msg_list_push(NORMAL_FLUSH);		if (io_filesfrom_f_out >= 0) {			if (io_filesfrom_buflen) {				if (FD_ISSET(io_filesfrom_f_out, &w_fds)) {					int l = write(io_filesfrom_f_out,						      io_filesfrom_bp,						      io_filesfrom_buflen);					if (l > 0) {						if (!(io_filesfrom_buflen -= l))							io_filesfrom_bp = io_filesfrom_buf;						else							io_filesfrom_bp += l;					} else {						/* XXX should we complain? */						io_filesfrom_f_out = -1;					}				}			} else if (io_filesfrom_f_in >= 0) {				if (FD_ISSET(io_filesfrom_f_in, &r_fds)) {					int l = read(io_filesfrom_f_in,						     io_filesfrom_buf,						     sizeof io_filesfrom_buf);					if (l <= 0) {						/* Send end-of-file marker */						io_filesfrom_buf[0] = '\0';						io_filesfrom_buf[1] = '\0';						io_filesfrom_buflen = io_filesfrom_lastchar? 2 : 1;						io_filesfrom_f_in = -1;					} else {						if (!eol_nulls) {							char *s = io_filesfrom_buf + l;							/* Transform CR and/or LF into '\0' */							while (s-- > io_filesfrom_buf) {								if (*s == '\n' || *s == '\r')									*s = '\0';							}						}						if (!io_filesfrom_lastchar) {							/* Last buf ended with a '\0', so don't							 * let this buf start with one. */							while (l && !*io_filesfrom_bp)								io_filesfrom_bp++, l--;						}						if (!l)							io_filesfrom_bp = io_filesfrom_buf;						else {							char *f = io_filesfrom_bp;							char *t = f;							char *eob = f + l;							/* Eliminate any multi-'\0' runs. */							while (f != eob) {								if (!(*t++ = *f++)) {									while (f != eob && !*f)										f++, l--;								}							}							io_filesfrom_lastchar = f[-1];						}						io_filesfrom_buflen = l;					}				}			}		}		if (!FD_ISSET(fd, &r_fds))			continue;		n = read(fd, buf, len);		if (n <= 0) {			if (n == 0)				whine_about_eof(); /* Doesn't return. */			if (errno == EINTR || errno == EWOULDBLOCK			    || errno == EAGAIN)				continue;			die_from_readerr(errno); /* Doesn't return. */		}		buf += n;		len -= n;		ret += n;		if (io_timeout)			last_io = time(NULL);	}	return ret;}