Function start_filesfrom_forwarding

io.c:1228–1240

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 making recv_file_list() call forward_filesfrom_data(), which * will ensure that we forward data t

 * will ensure that we forward data to the sender until we get some data
 * for recv_file_list() to use. */
void start_filesfrom_forwarding(int fd)
{
	if (protocol_version < 31 && OUT_MULTIPLEXED) {
		/* Older protocols send the files-from data w/o packaging
		 * it in multiplexed I/O packets, so temporarily switch
		 * to buffered I/O to match this behavior. */
		iobuf.msg.pos = iobuf.msg.len = 0; /* Be extra sure no messages go out. */
		ff_reenable_multiplex = io_end_multiplex_out(MPLX_TO_BUFFERED);
	}
	ff_forward_fd = fd;

	alloc_xbuf(&ff_xb, FILESFROM_BUFLEN);
}

/* Read a line into the "buf" buffer. */
int read_line(int fd, char *buf, size_t bufsiz, int flags)