diff --git a/photon/libc/include/dirent.h b/photon/libc/include/dirent.h
new file mode 100644
index 0000000..e629d7f
--- /dev/null
+++ b/photon/libc/include/dirent.h
@@ -0,0 +1,14 @@
+#ifndef DIRENT_H_
+#define DIRENT_H_
+
+#include <sys/_dirent.h>
+
+extern DIR *opendir(const char *path);
+extern int closedir(DIR *d);
+extern struct dirent *readdir(DIR *d);
+extern int readdir_r(DIR *d, struct dirent *entry, struct dirent **result);
+extern void rewinddir(DIR *d);
+extern void seekdir(DIR *d, long int off);
+extern long int telldir(DIR *d);
+
+#endif
diff --git a/photon/libc/include/limits.h b/photon/libc/include/limits.h
index 6e98aa7..190af41 100644
--- a/photon/libc/include/limits.h
+++ b/photon/libc/include/limits.h
@@ -1,6 +1,8 @@
 #ifndef LIMITS_H_
 #define LIMITS_H_
 
+#include <sys/_fconst.h>
+
 #define CHAR_BIT 8
 #define SCHAR_MIN -127
 #define SCHAR_MAX 127
@@ -30,4 +32,6 @@
 #define INT64_MAX LLONG_MAX
 #define UINT64_MAX ULLONG_MAX
 
+#define NAME_MAX __FILENAME_MAX
+
 #endif /* LIMITS_H_ */
diff --git a/photon/libc/sys/horizon/dirent.c b/photon/libc/sys/horizon/dirent.c
new file mode 100644
index 0000000..f55614b
--- /dev/null
+++ b/photon/libc/sys/horizon/dirent.c
@@ -0,0 +1,95 @@
+#include <dirent.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <mio/fs.h>
+#include <mio/dirent.h>
+
+DIR *opendir(const char *path)
+{
+    int fd = open(path, O_DIRECTORY);
+    if (fd < 0) {
+        return NULL;
+    }
+
+    DIR *out = malloc(sizeof(*out));
+    if (!out) {
+        __set_errno(ENOMEM);
+        return NULL;
+    }
+
+    memset(out, 0x0, sizeof(*out));
+    out->fd = fd;
+
+    return out;
+}
+
+int closedir(DIR *d)
+{
+    close(d->fd);
+    free(d);
+    return 0;
+}
+
+struct dirent *readdir(DIR *d)
+{
+    mio_dirent dent;
+    int r = mio_getdents(d->fd, &dent, 1);
+    if (r < 1) {
+        __set_errno(-r);
+        return NULL;
+    }
+
+    size_t name_max = sizeof(d->current_dent.d_name);
+    if (sizeof(dent.d_name) < name_max) {
+        name_max = sizeof(dent.d_name);
+    }
+
+    d->current_dent.d_ino = dent.d_ino;
+    d->current_dent.d_type = dent.d_type;
+    memcpy(d->current_dent.d_name, dent.d_name, name_max);
+
+    return &d->current_dent;
+}
+
+int readdir_r(DIR *d, struct dirent *entry, struct dirent **result)
+{
+    mio_dirent dent;
+    int r = mio_getdents(d->fd, &dent, 1);
+    if (r < 1) {
+        *result = NULL;
+        __set_errno(-r);
+        return -1;
+    }
+
+    size_t name_max = sizeof(d->current_dent.d_name);
+    if (sizeof(dent.d_name) < name_max) {
+        name_max = sizeof(dent.d_name);
+    }
+
+    d->current_dent.d_ino = dent.d_ino;
+    d->current_dent.d_type = dent.d_type;
+    memcpy(d->current_dent.d_name, dent.d_name, name_max);
+    memcpy(entry, &d->current_dent, sizeof(*entry));
+    *result = entry;
+
+    return 0;
+}
+
+void rewinddir(DIR *d)
+{
+    mio_seek(d->fd, 0, SEEK_SET);
+}
+
+void seekdir(DIR *d, long int off)
+{
+    mio_seek(d->fd, off, SEEK_SET);
+}
+
+long int telldir(DIR *d)
+{
+    return mio_seek(d->fd, 0, SEEK_CUR);
+}
diff --git a/photon/libc/sys/horizon/fcntl.h b/photon/libc/sys/horizon/fcntl.h
new file mode 100644
index 0000000..78787b5
--- /dev/null
+++ b/photon/libc/sys/horizon/fcntl.h
@@ -0,0 +1,31 @@
+#ifndef SYS_HORIZON_FCNTL_H_
+#define SYS_HORIZON_FCNTL_H_
+
+#include <sys/types.h>
+
+#define O_ACCMODE           0003
+#define O_RDONLY              00
+#define O_WRONLY              01
+#define O_RDWR                02
+#define O_CREAT             0100
+#define O_EXCL              0200
+#define O_NOCTTY            0400
+#define O_TRUNC            01000
+#define O_APPEND           02000
+#define O_NONBLOCK         04000
+#define O_NDELAY      O_NONBLOCK
+#define O_SYNC          04010000
+#define O_FSYNC           O_SYNC
+#define O_ASYNC           020000
+#define O_LARGEFILE      0100000
+
+#define O_DIRECTORY      0200000
+#define O_NOFOLLOW       0400000
+#define O_CLOEXEC       02000000
+#define O_DIRECT          040000
+#define O_NOATIME       01000000
+#define O_PATH         010000000
+#define O_DSYNC           010000
+#define O_TMPFILE   (020000000 | __O_DIRECTORY)
+
+#endif
diff --git a/photon/libc/sys/horizon/fio.c b/photon/libc/sys/horizon/fio.c
index c910f84..5f3fa69 100644
--- a/photon/libc/sys/horizon/fio.c
+++ b/photon/libc/sys/horizon/fio.c
@@ -67,6 +67,10 @@ unsigned int __fio_read(struct __io_file *f, char *buf, unsigned int sz)
 
 unsigned int __fio_write(struct __io_file *f, const char *buf, unsigned int sz)
 {
+#if 1
+    mx_console_write(buf, sz);
+    return sz;
+#else
     for (unsigned int i = 0; i < sz; i++) {
         if (f->buf_idx >= __FIO_BUFSZ) {
             __fio_flush(f);
@@ -79,6 +83,7 @@ unsigned int __fio_write(struct __io_file *f, const char *buf, unsigned int sz)
     }
 
     return sz;
+#endif
 }
 
 int __fio_ungetc(struct __io_file *f, char c)
diff --git a/photon/libc/sys/horizon/sys/_dirent.h b/photon/libc/sys/horizon/sys/_dirent.h
new file mode 100644
index 0000000..6925c4e
--- /dev/null
+++ b/photon/libc/sys/horizon/sys/_dirent.h
@@ -0,0 +1,18 @@
+#ifndef SYS_HORIZON_SYS__DIRENT_H_
+#define SYS_HORIZON_SYS__DIRENT_H_
+
+#include <sys/types.h>
+#include <limits.h>
+
+struct dirent {
+    ino_t d_ino;
+    unsigned char d_type;
+    char d_name[NAME_MAX + 1];
+};
+
+typedef struct {
+    int fd;
+    struct dirent current_dent;
+} DIR;
+
+#endif
diff --git a/photon/libc/sys/horizon/sys/_fconst.h b/photon/libc/sys/horizon/sys/_fconst.h
index 1733158..202a7db 100644
--- a/photon/libc/sys/horizon/sys/_fconst.h
+++ b/photon/libc/sys/horizon/sys/_fconst.h
@@ -1,7 +1,7 @@
-#ifndef SYS_LINUX_SYS__FCONST_H_
-#define SYS_LINUX_SYS__FCONST_H_
+#ifndef SYS_HORIZON_SYS__FCONST_H_
+#define SYS_HORIZON_SYS__FCONST_H_
 
-#define __FILENAME_MAX 1024
+#define __FILENAME_MAX 255
 
 #define __SEEK_SET 0
 #define __SEEK_CUR 1
diff --git a/photon/libc/sys/horizon/sys/types.h b/photon/libc/sys/horizon/sys/types.h
index 4a12c7a..50e8620 100644
--- a/photon/libc/sys/horizon/sys/types.h
+++ b/photon/libc/sys/horizon/sys/types.h
@@ -4,36 +4,4 @@
 #include <machine/_stdint.h>
 #include <mio/types.h>
 
-/* TODO move to mio/types.h */
-typedef signed long long blkcnt_t;
-typedef signed long long blksize_t;
-typedef unsigned long long clock_t;
-typedef unsigned int clockid_t;
-typedef unsigned long long fsblkcnt_t;
-typedef unsigned long long fsfilcnt_t;
-typedef unsigned int gid_t;
-typedef unsigned int id_t;
-typedef unsigned int key_t;
-typedef unsigned int mode_t;
-typedef unsigned long long nlink_t;
-typedef signed long long off_t;
-typedef __int64_t off64_t;
-typedef signed int pid_t;
-typedef unsigned long long time_t;
-typedef unsigned int timer_t;
-typedef unsigned int uid_t;
-typedef unsigned long useconds_t;
-typedef unsigned long long dev_t;
-
-#ifndef __size_t_defined
-#define __size_t_defined
-typedef __uintptr_t size_t;
-#endif
-
-#ifndef __ssize_t_defined
-#define __ssize_t_defined
-typedef __intptr_t ssize_t;
-#endif
-
-
 #endif
diff --git a/photon/libc/sys/horizon/unistd.h b/photon/libc/sys/horizon/unistd.h
index 11b83de..acec6d4 100644
--- a/photon/libc/sys/horizon/unistd.h
+++ b/photon/libc/sys/horizon/unistd.h
@@ -16,4 +16,6 @@ extern ssize_t read(int fd, void *buf, size_t count);
 extern ssize_t write(int fd, const void *buf, size_t count);
 extern int close(int fd);
 
+extern off_t lseek(int fd, off_t off, int whence);
+
 #endif