Add exclusive mode ioctls

ttynvt.c

@@ -46,7 +46,7 @@ static struct ttynvt_param {
     int             foreground;
 } ttynvt_param;
 
-typedef struct ttynvt {
+typedef struct {
     int             nonblock;
     pthread_mutex_t tty_lock;
     pthread_mutex_t poll_lock;
@@ -60,6 +60,7 @@ typedef struct ttynvt {
 
     struct termios  tio;
     unsigned char   mcr;
+    char            excl;
 
     char            buf[RX_BUF_SIZE];
     size_t          blen;
@@ -556,6 +557,10 @@ static const char *_ioctl_name(int cmd)
         CASE(TIOCMSET);
         CASE(TCSBRK);
         CASE(TIOCGWINSZ);
+        /* Exclusive mode */
+        CASE(TIOCEXCL);
+        CASE(TIOCGEXCL);
+        CASE(TIOCNXCL);
     }
 }
 
@@ -758,6 +763,27 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
         }
         break;
 
+    case TIOCEXCL:
+        if (tty->excl)
+        {
+            fuse_reply_err(req, EBUSY);
+        }
+        else
+        {
+            tty->excl = 1;
+            fuse_reply_ioctl(req, 0, 0, 0);
+        }
+        break;
+    case TIOCGEXCL:
+        CHECK_BUF_OUT(sizeof(int));
+        val = tty->excl;
+        fuse_reply_ioctl(req, 0, &val, sizeof(int));
+        break;
+    case TIOCNXCL:
+        tty->excl = 0;
+        fuse_reply_ioctl(req, 0, 0, 0);
+        break;
+
     default:
         fuse_reply_err(req, ENOSYS);
         break;