diff --git a/lib/chibi/posix.module b/lib/chibi/posix.module
index 77394032..95502c94 100644
--- a/lib/chibi/posix.module
+++ b/lib/chibi/posix.module
@@ -2,8 +2,9 @@
 (define-module (chibi posix)
   (export open-input-fd open-output-fd
           delete-file link-file symbolic-link rename-file
-          create-directory delete-directory
+          directory-files create-directory delete-directory
           current-seconds)
   (import (scheme))
-  (include-shared "posix"))
+  (include-shared "posix")
+  (include "posix.scm"))
 
diff --git a/lib/chibi/posix.scm b/lib/chibi/posix.scm
new file mode 100644
index 00000000..e2c6d56f
--- /dev/null
+++ b/lib/chibi/posix.scm
@@ -0,0 +1,7 @@
+
+(define (directory-files path)
+  (let ((dir (opendir path)))
+    (let lp ((res '()))
+      (let ((file (readdir dir)))
+        (if file (lp (cons (dirent-name file) res)) res)))))
+
diff --git a/lib/chibi/posix.stub b/lib/chibi/posix.stub
index 680084a9..a38eb0b1 100644
--- a/lib/chibi/posix.stub
+++ b/lib/chibi/posix.stub
@@ -2,6 +2,13 @@
 (c-system-include "sys/types.h")
 (c-system-include "time.h")
 (c-system-include "unistd.h")
+(c-system-include "dirent.h")
+
+(define-c-struct DIR
+  finalizer: closedir)
+
+(define-c-struct dirent
+  (string d_name dirent-name))
 
 (define-c input-port (open-input-fd fdopen) (int (value "r")))
 (define-c output-port (open-output-fd fdopen) (int (value "w")))
@@ -11,11 +18,21 @@
 (define-c errno (symbolic-link-file symlink) (string string))
 (define-c errno (rename-file rename) (string string))
 
+;; (define-c string (current-directory getcwd) ())
 (define-c errno (create-directory mkdir) (string int))
 (define-c errno (delete-directory rmdir) (string))
 
+(define-c (free DIR) opendir (string))
+(define-c dirent readdir (DIR))
+
 (define-c int (duplicate-fd dup) (int))
-;;(define-c errno pipe ((array int 2)))
+
+(define-c pid_t fork ())
+;; (define-c pid_t wait ((result pointer int)))
+;; (define-c void exit (int))
+;; (define-c int (execute execvp) (string (array string null)))
+
+;;(define-c errno pipe ((result array int 2)))
 
 (define-c time_t (current-seconds time) ((value NULL)))
 
diff --git a/tools/genstubs.scm b/tools/genstubs.scm
index 1f446f41..e5d5ea66 100755
--- a/tools/genstubs.scm
+++ b/tools/genstubs.scm
@@ -96,7 +96,7 @@
   (memq type '(short int long)))
 
 (define (unsigned-int-type? type)
-  (memq type '(unsigned-short unsigned-int unsigned-long size_t)))
+  (memq type '(unsigned-short unsigned-int unsigned-long size_t pid_t)))
 
 (define (int-type? type)
   (or (signed-int-type? type) (unsigned-int-type? type)))