add custom pty interface

cli/main.c

@@ -0,0 +1,24 @@
+#include "mkpty.h"
+#include "sys/types.h"
+
+
+// struct d_window {
+//   int ptmx; // fd
+// };
+
+// struct d_window new_window() {
+//   struct d_window w = {
+//     .ptmx = posix_openpt(O_RDWR | O_NOCTTY),
+//   };
+// }
+
+int main(int argc, char **argv) {
+  pid_t pid;
+  switch (pid = forkmkpty()) {
+  case -1:
+    break;
+  case 0:
+  default:
+    break;
+  }
+}