pterm.c now relies on backend `exitcode' functions returning <0 when

the session is still connected, and not returning an exit code until
after it's finished.

[originally from svn r3033]

raw.c

@@ -217,6 +217,10 @@ static void raw_provide_logctx(void *handle, void *logctx)
 
 static int raw_exitcode(void *handle)
 {
+    Raw raw = (Raw) handle;
+    if (raw->s != NULL)
+        return -1;                     /* still connected */
+    else
         /* Exit codes are a meaningless concept in the Raw protocol */
         return 0;
 }

rlogin.c

@@ -284,7 +284,10 @@ static void rlogin_provide_logctx(void *handle, void *logctx)
 
 static int rlogin_exitcode(void *handle)
 {
-    /* Rlogin rlogin = (Rlogin) handle; */
+    Rlogin rlogin = (Rlogin) handle;
+    if (rlogin->s != NULL)
+        return -1;                     /* still connected */
+    else
         /* If we ever implement RSH, we'll probably need to do this properly */
         return 0;
 }

telnet.c

@@ -996,7 +996,10 @@ static void telnet_provide_logctx(void *handle, void *logctx)
 
 static int telnet_exitcode(void *handle)
 {
-    /* Telnet telnet = (Telnet) handle; */
+    Telnet telnet = (Telnet) handle;
+    if (telnet->s != NULL)
+        return -1;                     /* still connected */
+    else
         /* Telnet doesn't transmit exit codes back to the client */
         return 0;
 }