telnet: do not check for 0 return from poll (it's impossible)

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/networking/telnet.c b/networking/telnet.c
index 0cf28f6419124971934f8cc233f839b032ed0796..f6fad684cff529995852ae3ce1c9125f006343f8 100644 (file)
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -603,39 +603,39 @@ int telnet_main(int argc UNUSED_PARAM, char **argv)
 
        signal(SIGINT, record_signo);
 
-       ufds[0].fd = 0; ufds[1].fd = netfd;
-       ufds[0].events = ufds[1].events = POLLIN;
+       ufds[0].fd = STDIN_FILENO;
+       ufds[0].events = POLLIN;
+       ufds[1].fd = netfd;
+       ufds[1].events = POLLIN;
 
        while (1) {
-               switch (poll(ufds, 2, -1)) {
-               case 0:
-                       /* timeout */
-               case -1:
+               if (poll(ufds, 2, -1) < 0) {
                        /* error, ignore and/or log something, bay go to loop */
                        if (bb_got_signal)
                                con_escape();
                        else
                                sleep(1);
-                       break;
-               default:
-
-                       if (ufds[0].revents) {
-                               len = safe_read(STDIN_FILENO, G.buf, DATABUFSIZE);
-                               if (len <= 0)
-                                       doexit(EXIT_SUCCESS);
-                               TRACE(0, ("Read con: %d\n", len));
-                               handle_net_output(len);
-                       }
+                       continue;
+               }
+
+// FIXME: reads can block. Need full bidirectional buffering.
+
+               if (ufds[0].revents) {
+                       len = safe_read(STDIN_FILENO, G.buf, DATABUFSIZE);
+                       if (len <= 0)
+                               doexit(EXIT_SUCCESS);
+                       TRACE(0, ("Read con: %d\n", len));
+                       handle_net_output(len);
+               }
 
-                       if (ufds[1].revents) {
-                               len = safe_read(netfd, G.buf, DATABUFSIZE);
-                               if (len <= 0) {
-                                       full_write1_str("Connection closed by foreign host\r\n");
-                                       doexit(EXIT_FAILURE);
-                               }
-                               TRACE(0, ("Read netfd (%d): %d\n", netfd, len));
-                               handle_net_input(len);
+               if (ufds[1].revents) {
+                       len = safe_read(netfd, G.buf, DATABUFSIZE);
+                       if (len <= 0) {
+                               full_write1_str("Connection closed by foreign host\r\n");
+                               doexit(EXIT_FAILURE);
                        }
+                       TRACE(0, ("Read netfd (%d): %d\n", netfd, len));
+                       handle_net_input(len);
                }
        } /* while (1) */
 }