Don't quit the plink main loop until the stdout and stderr buffers

are empty.

[originally from svn r1313]

plink.c

@@ -787,11 +787,13 @@ int main(int argc, char **argv)
 	} else if (n == 1) {
 	    reading = 0;
 	    noise_ultralight(idata.len);
+	    if (connopen && back->socket() != NULL) {
 		if (idata.len > 0) {
 		    back->send(idata.buffer, idata.len);
 		} else {
 		    back->special(TS_EOF);
 		}
+	    }
 	} else if (n == 2) {
 	    odata.busy = 0;
 	    if (!odata.writeret) {
@@ -801,8 +803,10 @@ int main(int argc, char **argv)
 	    bufchain_consume(&stdout_data, odata.lenwritten);
 	    if (bufchain_size(&stdout_data) > 0)
 		try_output(0);
+	    if (connopen && back->socket() != NULL) {
 		back->unthrottle(bufchain_size(&stdout_data) +
 				 bufchain_size(&stderr_data));
+	    }
 	} else if (n == 3) {
 	    edata.busy = 0;
 	    if (!edata.writeret) {
@@ -812,14 +816,18 @@ int main(int argc, char **argv)
 	    bufchain_consume(&stderr_data, edata.lenwritten);
 	    if (bufchain_size(&stderr_data) > 0)
 		try_output(1);
+	    if (connopen && back->socket() != NULL) {
 		back->unthrottle(bufchain_size(&stdout_data) +
 				 bufchain_size(&stderr_data));
 	    }
+	}
 	if (!reading && back->sendbuffer() < MAX_STDIN_BACKLOG) {
 	    SetEvent(idata.eventback);
 	    reading = 1;
 	}
-	if (!connopen || back->socket() == NULL)
+	if ((!connopen || back->socket() == NULL) &&
+	    bufchain_size(&stdout_data) == 0 &&
+	    bufchain_size(&stderr_data) == 0)
 	    break;		       /* we closed the connection */
     }
     WSACleanup();