From: H.G. Muller <h.g.muller@hccnet.nl>
Date: Sun, 24 Jan 2010 10:46:30 +0000 (+0100)
Subject: Use -keepAlive option to determine connection health
X-Git-Tag: v4.4.3.20100220~22
X-Git-Url: http://winboard.nl/cgi-bin?p=xboard.git;a=commitdiff_plain;h=1df59f5885aaf9f5d0ecf0e8ba31bc3fcb776103

Use -keepAlive option to determine connection health

When there has been no ICS response since the previous 'ping', assume we
are disconnected and do a fatal-error exit. Also auto-start the ping
process in InitBackend3().
---

diff --git a/backend.c b/backend.c
index 28c5546..1e0bf93 100644
--- a/backend.c
+++ b/backend.c
@@ -187,6 +187,7 @@ void DisplayMove P((int moveNumber));
 
 void ParseGameHistory P((char *game));
 void ParseBoard12 P((char *string));
+void KeepAlive P((void));
 void StartClocks P((void));
 void SwitchClocks P((void));
 void StopClocks P((void));
@@ -242,6 +243,7 @@ char endingGame = 0;    /* [HGM] crash: flag to prevent recursion of GameEnds()
 int whiteNPS, blackNPS; /* [HGM] nps: for easily making clocks aware of NPS     */
 VariantClass currentlyInitializedVariant; /* [HGM] variantswitch */
 int lastIndex = 0;      /* [HGM] autoinc: last game/position used in match mode */
+Boolean connectionAlive;/* [HGM] alive: ICS connection status from probing      */
 int opponentKibitzes;
 int lastSavedGame; /* [HGM] save: ID of game */
 char chatPartner[MAX_CHAT][MSG_SIZ]; /* [HGM] chat: list of chatting partners */
@@ -1097,6 +1099,8 @@ InitBackEnd3 P((void))
 	  AddInputSource(icsPR, FALSE, read_from_ics, &telnetISR);
 	fromUserISR =
 	  AddInputSource(NoProc, FALSE, read_from_player, &fromUserISR);
+	if(appData.keepAlive) // [HGM] alive: schedule sending of dummy 'date' command
+	    ScheduleDelayedEvent(KeepAlive, appData.keepAlive*60*1000);
     } else if (appData.noChessProgram) {
 	SetNCPMode();
     } else {
@@ -1417,6 +1421,8 @@ read_from_player(isr, closure, message, count, error)
 void
 KeepAlive()
 {   // [HGM] alive: periodically send dummy (date) command to ICS to prevent time-out
+    if(!connectionAlive) DisplayFatalError("No response from ICS", 0, 1);
+    connectionAlive = FALSE; // only sticks if no response to 'date' command.
     SendToICS("date\n");
     if(appData.keepAlive) ScheduleDelayedEvent(KeepAlive, appData.keepAlive*60*1000);
 }
@@ -2071,6 +2077,8 @@ read_from_ics(isr, closure, data, count, error)
     char talker[MSG_SIZ]; // [HGM] chat
     int channel;
 
+    connectionAlive = TRUE; // [HGM] alive: I think, therefore I am...
+
     if (appData.debugMode) {
       if (!error) {
 	fprintf(debugFP, "<ICS: ");