Retry hangup, default is up to 10 attempts before giving up

HangupAttempts is configurable in the [com] section of the sexpots.ini file.

src/sexpots/sexpots.c

@@ -89,6 +89,7 @@ ulong	com_baudrate=0;
 BOOL	dcd_ignore=FALSE;
 int		dcd_timeout=10;	/* seconds */
 ulong	dtr_delay=100;	/* milliseconds */
+int		hangup_attempts=10;
 
 BOOL	terminated=FALSE;
 BOOL	terminate_after_one_call=FALSE;
@@ -1256,24 +1257,29 @@ BOOL handle_call(void)
 BOOL hangup_call(COM_HANDLE com_handle)
 {
 	time_t start;
+	int		attempt;
 
 	if((comGetModemStatus(com_handle)&COM_DCD)==0)	/* DCD already low */
 		return TRUE;
 
 	lprintf(LOG_DEBUG,"Waiting for transmit buffer to empty");
 	SLEEP(dtr_delay);
-	lprintf(LOG_INFO,"Dropping DTR");
-	if(!comLowerDTR(com_handle))
-		return FALSE;
-
-	lprintf(LOG_INFO,"Waiting for loss of Carrier Detect (DCD)");
-	start=time(NULL);
-	while(time(NULL)-start <= dcd_timeout) {
-		if((comGetModemStatus(com_handle)&COM_DCD) == 0)
-			return TRUE;
-		SLEEP(1000); 
+	for(attempt=0; attempt<hangup_attempts; attempt++) {
+		lprintf(LOG_INFO,"Dropping DTR (attempt #%d)", attempt+1);
+		if(!comLowerDTR(com_handle)) {
+			lprintf(LOG_ERR,"ERROR %u lowering DTR", COM_ERROR);
+			continue;
+		}
+		lprintf(LOG_INFO,"Waiting for loss of Carrier Detect (DCD)");
+		start=time(NULL);
+		while(time(NULL)-start <= dcd_timeout) {
+			if((comGetModemStatus(com_handle)&COM_DCD)==0)
+				return TRUE;
+			SLEEP(1000); 
+		}
+		lprintf(LOG_ERR,"TIMEOUT waiting for DCD to drop (attempt #%d of %d)"
+			, attempt+1, hangup_attempts);
 	}
-	lprintf(LOG_ERR,"TIMEOUT waiting for DCD to drop");
 
 	return FALSE;
 }
@@ -1318,6 +1324,7 @@ void parse_ini_file(const char* ini_fname)
 	iniGetExistingString(list, section, "Device", NULL, com_dev);
 	com_baudrate    = iniGetLongInt(list, section, "BaudRate", com_baudrate);
 	com_hangup	    = iniGetBool(list, section, "Hangup", com_hangup);
+	hangup_attempts = iniGetInteger(list, section, "HangupAttempts", hangup_attempts);
 	dcd_timeout     = iniGetInteger(list, section, "DCDTimeout", dcd_timeout);
 	dcd_ignore      = iniGetBool(list, section, "IgnoreDCD", dcd_ignore);
 	dtr_delay		= iniGetLongInt(list, section, "DTRDelay", dtr_delay);