+static void decrement_flist_in_progress(int ndx, int redo)
+{
+ struct file_list *flist = cur_flist ? cur_flist : first_flist;
+
+ while (ndx < flist->ndx_start) {
+ if (flist == first_flist) {
+ invalid_ndx:
+ rprintf(FERROR,
+ "Invalid file index: %d (%d - %d) [%s]\n",
+ ndx, first_flist->ndx_start,
+ first_flist->prev->ndx_start + first_flist->prev->count - 1,
+ who_am_i());
+ exit_cleanup(RERR_PROTOCOL);
+ }
+ flist = flist->prev;
+ }
+ while (ndx >= flist->ndx_start + flist->count) {
+ if (!(flist = flist->next))
+ goto invalid_ndx;
+ }
+
+ flist->in_progress--;
+ if (redo)
+ flist->to_redo++;
+}
+
+/* Write an message to a multiplexed stream. If this fails, rsync exits. */
+static void mplex_write(int fd, enum msgcode code, const char *buf, size_t len)
+{
+ char buffer[1024];
+ size_t n = len;
+
+ SIVAL(buffer, 0, ((MPLEX_BASE + (int)code)<<24) + len);
+
+ if (n > sizeof buffer - 4)
+ n = 0;
+ else
+ memcpy(buffer + 4, buf, n);
+
+ writefd_unbuffered(fd, buffer, n+4);
+
+ len -= n;
+ buf += n;
+
+ if (len) {
+ defer_forwarding_messages++;
+ writefd_unbuffered(fd, buf, len);
+ if (!--defer_forwarding_messages)
+ msg2sndr_flush();
+ }
+}
+
+int send_msg(enum msgcode code, const char *buf, int len)
+{
+ if (msg_fd_out < 0) {
+ if (!defer_forwarding_messages)
+ return io_multiplex_write(code, buf, len);
+ if (!io_multiplexing_out)
+ return 0;
+ msg_list_add(&msg2sndr, code, buf, len);
+ return 1;
+ }
+ mplex_write(msg_fd_out, code, buf, len);
+ return 1;
+}
+
+void send_msg_int(enum msgcode code, int num)
+{
+ char numbuf[4];
+ SIVAL(numbuf, 0, num);
+ send_msg(code, numbuf, 4);
+}
+
+void wait_for_receiver(void)
+{
+ if (iobuf_out_cnt)
+ io_flush(NORMAL_FLUSH);
+ else
+ read_msg_fd();
+}
+
+int get_redo_num(void)
+{
+ return flist_ndx_pop(&redo_list);
+}
+
+int get_hlink_num(void)
+{
+ return flist_ndx_pop(&hlink_list);
+}
+
+/**
+ * When we're the receiver and we have a local --files-from list of names
+ * that needs to be sent over the socket to the sender, we have to do two
+ * things at the same time: send the sender a list of what files we're
+ * processing and read the incoming file+info list from the sender. We do
+ * this by augmenting the read_timeout() function to copy this data. It
+ * uses the io_filesfrom_buf to read a block of data from f_in (when it is
+ * ready, since it might be a pipe) and then blast it out f_out (when it
+ * is ready to receive more data).
+ */
+void io_set_filesfrom_fds(int f_in, int f_out)
+{
+ io_filesfrom_f_in = f_in;
+ io_filesfrom_f_out = f_out;
+ io_filesfrom_bp = io_filesfrom_buf;
+ io_filesfrom_lastchar = '\0';
+ io_filesfrom_buflen = 0;
+}