1 files changed, 12 insertions, 3 deletions

diff --git a/Presence/monitortty.c b/Presence/monitortty.c
index a9a095cf..7582aa56 100644
--- a/Presence/monitortty.c
+++ b/Presence/monitortty.c
@@ -146,10 +146,19 @@ void *write_vtch(void *pfd) {
 }
 
 
-void monitorTTY(int fd) {
+// Returns 0 on success.
+int monitorTTY(int fd) {
+    int er = -1, dev = -1;
         pthread_mutex_init(&mu,NULL);
-        // printf ("Hello world.\n");
-        pthread_create (&mt, NULL, write_vtch, (void*)(intptr_t)fd);
+    // Ensure we can open a device before we bother forking a thread.
+        dev = ttyfd();
+    if( dev != -1 ) {
+        er = pthread_create (&mt, NULL, write_vtch, (void*)(intptr_t)fd);
+        return er;
+    }
+    else {
+        return -1;
+    }
 }
 
 void closeTTY() {