diff --git a/cli/main.c b/cli/main.c
index 86f4ffd..e2d4986 100644
--- a/cli/main.c
+++ b/cli/main.c
@@ -1,6 +1,7 @@
-#include "mkpty.h"
-#include "sys/types.h"
+#include <stdio.h>
+#include <stdlib.h>
 
+#include "mkpty.h"
 
 // struct d_window {
 //   int ptmx; // fd
@@ -16,9 +17,14 @@ int main(int argc, char **argv) {
   pid_t pid;
   switch (pid = forkmkpty()) {
   case -1:
+    perror("forkmkpty");
     break;
   case 0:
+    printf("fork: children\n");
+    break;
   default:
+    printf("fork: parent\n");
     break;
   }
+  return EXIT_SUCCESS;
 }
diff --git a/cli/mkpty.c b/cli/mkpty.c
index 1455f48..4cda39c 100644
--- a/cli/mkpty.c
+++ b/cli/mkpty.c
@@ -113,7 +113,7 @@ int bindpty(const int fdty) {
  * forkpty() function. It exists as a learning resource.
  * REF: https://sourceware.org/git/glibc.git -> ./login/forkpty.c
  */
-pid_t forkmkpty() {
+pid_t forkmkpty(void) {
   int fdmx, fds;
   pid_t pid;
   if (mkpty(&fdmx, &fds))
diff --git a/cli/mkpty.h b/cli/mkpty.h
index ed0bce8..a62a27a 100644
--- a/cli/mkpty.h
+++ b/cli/mkpty.h
@@ -3,10 +3,12 @@
 
 #include <sys/types.h>
 
-/* Custom implementations of openpty() */
+/* Custom implementation of glibc::openpty() */
 int mkpty(int *fdmx, int *fds);
-/* Custom implementations of forkpty() */
-pid_t forkmkpty();
+/* Custom implementation of glibc::login_tty() */
+int bindpty(const int fdty);
+/* Custom implementation of glibc::forkpty() */
+pid_t forkmkpty(void);
 
 int setptsxy(const unsigned short rows, const unsigned short cols, const int fds);
 int getptsxy(unsigned short *rows, unsigned short *cols, const int fds);