telnetd: set SO_KEEPALIVE, users report it's useful. +20 bytes.

1 files changed, 4 insertions, 0 deletions

diff --git a/networking/telnetd.c b/networking/telnetd.c
index f60c42056..46dfb318f 100644
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@@ -182,6 +182,8 @@ make_new_session(
         ndelay_on(fd);
 #if ENABLE_FEATURE_TELNETD_STANDALONE
         ts->sockfd_read = sock;
+        /* SO_KEEPALIVE by popular demand */
+        setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
         ndelay_on(sock);
         if (!sock) { /* We are called with fd 0 - we are in inetd mode */
                 sock++; /* so use fd 1 for output */
@@ -191,6 +193,8 @@ make_new_session(
         if (sock > maxfd)
                 maxfd = sock;
 #else
+        /* SO_KEEPALIVE by popular demand */
+        setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
         /* ts->sockfd_read = 0; - done by xzalloc */
         ts->sockfd_write = 1;
         ndelay_on(0);