Add add a timeout to the event_loop in sync.c

This timeout can be used to cancel async connect attempts to
a remote target.

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>

lib/sync.c

@@ -54,11 +54,27 @@ static void
 event_loop(struct iscsi_context *iscsi, struct iscsi_sync_state *state)
 {
         struct pollfd pfd;
+	int scsi_timeout;
 	int ret;
+	time_t t;
 
+        if (iscsi->scsi_timeout) {
+		scsi_timeout = time(NULL) + iscsi->scsi_timeout;
+	} else {
+		scsi_timeout = 0;
+	}
+
 	while (state->finished == 0) {
 		short revents;
 
+                if (scsi_timeout) {
+                        t = time(NULL);
+                        if (t > scsi_timeout) {
+                                iscsi_set_error(iscsi, "Connect timedout");
+                                state->status = -1;
+                                return;
+                        }
+                }
 		pfd.fd = iscsi_get_fd(iscsi);
 		pfd.events = iscsi_which_events(iscsi);