+ /* Only do more filesfrom processing if there is enough room in the out buffer. */
+ if (ff_forward_fd >= 0 && iobuf.out.size - iobuf.out.len > FILESFROM_BUFLEN*2) {
+ FD_SET(ff_forward_fd, &r_fds);
+ if (ff_forward_fd > max_fd)
+ max_fd = ff_forward_fd;
+ }
+
+ FD_ZERO(&w_fds);
+ if (iobuf.out_fd >= 0) {
+ if (iobuf.raw_flushing_ends_before
+ || (!iobuf.msg.len && iobuf.out.len > iobuf.out_empty_len && !(flags & PIO_NEED_MSGROOM))) {
+ if (OUT_MULTIPLEXED && !iobuf.raw_flushing_ends_before) {
+ size_t val;
+
+ /* The iobuf.raw_flushing_ends_before value can point off the end
+ * of the iobuf.out buffer for a while, for easier subtracting. */
+ iobuf.raw_flushing_ends_before = iobuf.out.pos + iobuf.out.len;
+
+ SIVAL(iobuf.out.buf + iobuf.raw_data_header_pos, 0,
+ ((MPLEX_BASE + (int)MSG_DATA)<<24) + iobuf.out.len - 4);
+ if ((val = iobuf.out.size - iobuf.raw_data_header_pos) < 4) {
+ /* We used some of the overflow bytes, so move them. */
+ if (DEBUG_GTE(IO, 4)) {
+ rprintf(FINFO, "[%s] wrap-bytes moved: %d (perform_io)\n",
+ who_am_i(), (int)val);
+ }
+ memcpy(iobuf.out.buf, iobuf.out.buf + iobuf.out.size, 4 - val);
+ }
+
+ if (DEBUG_GTE(IO, 1)) {
+ rprintf(FINFO, "[%s] send_msg(%d, %ld)\n",
+ who_am_i(), (int)MSG_DATA, (long)iobuf.out.len - 4);
+ }
+
+ /* reserve room for the next MSG_DATA header */
+ iobuf.raw_data_header_pos = iobuf.raw_flushing_ends_before;
+ if (iobuf.raw_data_header_pos >= iobuf.out.size)
+ iobuf.raw_data_header_pos -= iobuf.out.size;
+ iobuf.out.len += 4;
+ }
+
+ empty_buf_len = iobuf.out_empty_len;
+ out = &iobuf.out;
+ } else if (iobuf.msg.len) {
+ empty_buf_len = 0;
+ out = &iobuf.msg;
+ } else
+ out = NULL;
+ if (out) {
+ FD_SET(iobuf.out_fd, &w_fds);
+ if (iobuf.out_fd > max_fd)
+ max_fd = iobuf.out_fd;
+ }
+ } else
+ out = NULL;
+
+ if (max_fd < 0) {
+ switch (flags & PIO_NEED_FLAGS) {
+ case PIO_NEED_INPUT:
+ rprintf(FERROR, "error in perform_io: no fd for input.\n");
+ exit_cleanup(RERR_PROTOCOL);
+ case PIO_NEED_OUTROOM:
+ case PIO_NEED_MSGROOM:
+ msgs2stderr = 1;
+ rprintf(FERROR, "error in perform_io: no fd for output.\n");
+ exit_cleanup(RERR_PROTOCOL);
+ default:
+ /* No stated needs, so I guess this is OK. */
+ break;
+ }
+ break;
+ }
+
+ if (extra_flist_sending_enabled) {
+ if (file_total - file_old_total < MAX_FILECNT_LOOKAHEAD
+ && file_total - file_old_total >= MIN_FILECNT_LOOKAHEAD)
+ tv.tv_sec = 0;
+ else {
+ extra_flist_sending_enabled = False;
+ tv.tv_sec = select_timeout;
+ }
+ } else
+ tv.tv_sec = select_timeout;
+ tv.tv_usec = 0;
+
+ cnt = select(max_fd + 1, &r_fds, &w_fds, &e_fds, &tv);
+
+ if (cnt <= 0) {
+ if (cnt < 0 && errno == EBADF) {
+ msgs2stderr = 1;
+ exit_cleanup(RERR_SOCKETIO);
+ }
+ if (extra_flist_sending_enabled) {
+ extra_flist_sending_enabled = False;
+ send_extra_file_list(sock_f_out, -1);
+ extra_flist_sending_enabled = !flist_eof;
+ } else
+ check_timeout();
+ FD_ZERO(&r_fds); /* Just in case... */
+ FD_ZERO(&w_fds);