diff --git a/generation.c b/generation.c
index e0ea3d3..65b0632 100644
--- a/generation.c
+++ b/generation.c
@@ -1,128 +1,69 @@
+/*
+@file generation.c
+*/
 #include <errno.h>
 #include <malloc.h>
-#include <stdio.h>
-#include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
 #include <unistd.h>
 
-int reproduce(unsigned char *pic_address, int pic_size)
+int reproduce(void *pic_address, int *pic_size)
 {
-    int return_value = 0;
+    int status = 0;
 
-    for (int iter = 0; iter < pic_size; iter++)
-    {
-        printf("%02X", pic_address[iter]);
-    }
+    printf("{\"address\": \"%p\",\"length\": \"%d\"}\n", pic_address,
+           *pic_size);
 
-    return_value = 1;
+    status = 1;
 CLONE_CLEANUP:
-    if (NULL != pic_address)
-    {
-        munmap(pic_address, pic_size);
-    }
 
-    exit(0);
+    return status;
 }
 
-int hex_ascii_to_bin(char *hex_string, int hex_len, unsigned char *hex_bin)
+int generation(void *child, int *child_len)
 {
-    if (hex_bin == NULL || hex_string == NULL || hex_len % 2 != 0)
-    {
-        return 0;
-    }
-
-    char *position = hex_string;
-
-    for (int index = 0; index - 1 < hex_len; index++)
-    {
-        if (*position == NULL) break;
-
-        for (int offset = 0; offset < 2; offset++, position++)
-        {
-            unsigned char hex_sort = *position | 0x20;
-
-            if (hex_sort >= '0' && hex_sort <= '9')
-            {
-                hex_sort -= 0x30;
-            }
-            else if (hex_sort <= 'f' && hex_sort >= 'a')
-            {
-                hex_sort -= 0x57;
-            }
-            else
-            {
-                return 0;
-            }
-            if (!offset)
-            {
-                hex_bin[index] = (hex_sort << 4);
-            }
-            else
-            {
-                hex_bin[index] |= hex_sort;
-            }
-        }
-    }
-
-    return 1;
-}
-
-int generation(char *parent_hex, int rand_offset, char rand_flip)
-{
-    int return_value = 0;
-    int parent_hex_len = strlen(parent_hex);
-    int parent_bin_len = parent_hex_len / 2;
+    int status = 0;
 
     int prot = (PROT_READ | PROT_WRITE | PROT_EXEC);
     int flags = (MAP_ANON | MAP_PRIVATE);
-    unsigned char *pic_buffer = mmap(NULL, parent_bin_len, prot, flags, -1, 0);
+    void *pic_buffer = mmap(NULL, child_len, prot, flags, -1, 0);
+
     if (MAP_FAILED == pic_buffer)
     {
-        return_value = errno;
+        status = errno;
         goto GEN_CLEANUP;
     }
 
-    hex_ascii_to_bin(parent_hex, parent_hex_len, pic_buffer);
+    memcpy(child, pic_buffer, *child_len);
 
-    pic_buffer[rand_offset] = pic_buffer[rand_offset] ^ rand_flip;
+    int (*reproduce_function)(void *, int) = reproduce;
+    void (*pic_function)(void *, int *, void *) = pic_buffer;
 
-    int (*reproduce_function)(unsigned char *, int) = reproduce;
-    void (*pic_function)(void *, int, void *) = pic_buffer;
+    pic_function(pic_buffer, child_len, reproduce_function);
 
-    pic_function(pic_buffer, parent_bin_len, reproduce_function);
-
-    return_value = 1;
+    status = 1;
 GEN_CLEANUP:
-    if (NULL != pic_buffer)
-    {
-        munmap(pic_buffer, parent_bin_len);
-    }
 
-    return return_value;
+    return status;
 }
 
-int main(int argc, const char **argv)
+int gen_fork(void *child, int *child_len)
 {
-    if (3 > argc || argv[1] == NULL || argv[2] == NULL || argv[3] == NULL)
-    {
-        exit(1);
-    }
-
-    char *hex_string = argv[1];
-    int rand_offset = atoi(argv[2]);
-    char rand_flip = atoi(argv[3]);
     pid_t process_id;
-    int return_value = 0;
+    int status = 0;
+
+    *child_len = 999;
+
+    return 0;
 
     process_id = fork();
 
-    if(0 == process_id)
+    if (0 == process_id)
     {
-        return_value = generation(hex_string, rand_offset, rand_flip);
-        if (return_value)
+        status = generation(child, child_len);
+        if (status)
         {
-            exit(0);
+            return 0;
         }
     }
 
diff --git a/list.h b/list.h
deleted file mode 100644
index 850f8c8..0000000
--- a/list.h
+++ /dev/null
@@ -1,517 +0,0 @@
-/**
- *
- * I grub it from linux kernel source code and fix it for user space
- * program. Of course, this is a GPL licensed header file.
- *
- * Here is a recipe to cook list.h for user space program
- *
- * 1. copy list.h from linux/include/list.h
- * 2. remove
- *     - #ifdef __KERNE__ and its #endif
- *     - all #include line
- *     - prefetch() and rcu related functions
- * 3. add macro offsetof() and container_of
- *
- * - kazutomo@mcs.anl.gov
- */
-#ifndef _LINUX_LIST_H
-#define _LINUX_LIST_H
-
-/**
- * @name from other kernel headers
- */
-/*@{*/
-
-/**
- * Get offset of a member
- */
-#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
-
-/**
- * Casts a member of a structure out to the containing structure
- * @param ptr        the pointer to the member.
- * @param type       the type of the container struct this is embedded in.
- * @param member     the name of the member within the struct.
- *
- */
-#define container_of(ptr, type, member) ({                      \
-        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
-        (type *)( (char *)__mptr - offsetof(type,member) );})
-/*@}*/
-
-
-/*
- * These are non-NULL pointers that will result in page faults
- * under normal circumstances, used to verify that nobody uses
- * non-initialized list entries.
- */
-#define LIST_POISON1  ((void *) 0x00100100)
-#define LIST_POISON2  ((void *) 0x00200200)
-
-/**
- * Simple doubly linked list implementation.
- *
- * Some of the internal functions ("__xxx") are useful when
- * manipulating whole lists rather than single entries, as
- * sometimes we already know the next/prev entries and we can
- * generate better code by using them directly rather than
- * using the generic single-entry routines.
- */
-struct list_head {
-  struct list_head *next, *prev;
-};
-
-#define LIST_HEAD_INIT(name) { &(name), &(name) }
-
-#define LIST_HEAD(name) \
-  struct list_head name = LIST_HEAD_INIT(name)
-
-#define INIT_LIST_HEAD(ptr) do { \
-  (ptr)->next = (ptr); (ptr)->prev = (ptr); \
-} while (0)
-
-/*
- * Insert a new entry between two known consecutive entries.
- *
- * This is only for internal list manipulation where we know
- * the prev/next entries already!
- */
-static inline void __list_add(struct list_head *new,
-            struct list_head *prev,
-            struct list_head *next)
-{
-  next->prev = new;
-  new->next = next;
-  new->prev = prev;
-  prev->next = new;
-}
-
-/**
- * list_add - add a new entry
- * @new: new entry to be added
- * @head: list head to add it after
- *
- * Insert a new entry after the specified head.
- * This is good for implementing stacks.
- */
-static inline void list_add(struct list_head *new, struct list_head *head)
-{
-  __list_add(new, head, head->next);
-}
-
-/**
- * list_add_tail - add a new entry
- * @new: new entry to be added
- * @head: list head to add it before
- *
- * Insert a new entry before the specified head.
- * This is useful for implementing queues.
- */
-static inline void list_add_tail(struct list_head *new, struct list_head *head)
-{
-  __list_add(new, head->prev, head);
-}
-
-
-/*
- * Delete a list entry by making the prev/next entries
- * point to each other.
- *
- * This is only for internal list manipulation where we know
- * the prev/next entries already!
- */
-static inline void __list_del(struct list_head * prev, struct list_head * next)
-{
-  next->prev = prev;
-  prev->next = next;
-}
-
-/**
- * list_del - deletes entry from list.
- * @entry: the element to delete from the list.
- * Note: list_empty on entry does not return true after this, the entry is
- * in an undefined state.
- */
-static inline void list_del(struct list_head *entry)
-{
-  __list_del(entry->prev, entry->next);
-  entry->next = LIST_POISON1;
-  entry->prev = LIST_POISON2;
-}
-
-
-
-/**
- * list_del_init - deletes entry from list and reinitialize it.
- * @entry: the element to delete from the list.
- */
-static inline void list_del_init(struct list_head *entry)
-{
-  __list_del(entry->prev, entry->next);
-  INIT_LIST_HEAD(entry);
-}
-
-/**
- * list_move - delete from one list and add as another's head
- * @list: the entry to move
- * @head: the head that will precede our entry
- */
-static inline void list_move(struct list_head *list, struct list_head *head)
-{
-        __list_del(list->prev, list->next);
-        list_add(list, head);
-}
-
-/**
- * list_move_tail - delete from one list and add as another's tail
- * @list: the entry to move
- * @head: the head that will follow our entry
- */
-static inline void list_move_tail(struct list_head *list,
-          struct list_head *head)
-{
-        __list_del(list->prev, list->next);
-        list_add_tail(list, head);
-}
-
-/**
- * list_empty - tests whether a list is empty
- * @head: the list to test.
- */
-static inline int list_empty(const struct list_head *head)
-{
-  return head->next == head;
-}
-
-static inline void __list_splice(struct list_head *list,
-         struct list_head *head)
-{
-  struct list_head *first = list->next;
-  struct list_head *last = list->prev;
-  struct list_head *at = head->next;
-
-  first->prev = head;
-  head->next = first;
-
-  last->next = at;
-  at->prev = last;
-}
-
-/**
- * list_splice - join two lists
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- */
-static inline void list_splice(struct list_head *list, struct list_head *head)
-{
-  if (!list_empty(list))
-    __list_splice(list, head);
-}
-
-/**
- * list_splice_init - join two lists and reinitialise the emptied list.
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- *
- * The list at @list is reinitialised
- */
-static inline void list_splice_init(struct list_head *list,
-            struct list_head *head)
-{
-  if (!list_empty(list)) {
-    __list_splice(list, head);
-    INIT_LIST_HEAD(list);
-  }
-}
-
-/**
- * list_entry - get the struct for this entry
- * @ptr:  the &struct list_head pointer.
- * @type: the type of the struct this is embedded in.
- * @member: the name of the list_struct within the struct.
- */
-#define list_entry(ptr, type, member) \
-  container_of(ptr, type, member)
-
-/**
- * list_for_each  - iterate over a list
- * @pos:  the &struct list_head to use as a loop counter.
- * @head: the head for your list.
- */
-
-#define list_for_each(pos, head) \
-  for (pos = (head)->next; pos != (head); \
-       pos = pos->next)
-
-/**
- * __list_for_each  - iterate over a list
- * @pos:  the &struct list_head to use as a loop counter.
- * @head: the head for your list.
- *
- * This variant differs from list_for_each() in that it's the
- * simplest possible list iteration code, no prefetching is done.
- * Use this for code that knows the list to be very short (empty
- * or 1 entry) most of the time.
- */
-#define __list_for_each(pos, head) \
-  for (pos = (head)->next; pos != (head); pos = pos->next)
-
-/**
- * list_for_each_prev - iterate over a list backwards
- * @pos:  the &struct list_head to use as a loop counter.
- * @head: the head for your list.
- */
-#define list_for_each_prev(pos, head) \
-  for (pos = (head)->prev; prefetch(pos->prev), pos != (head); \
-          pos = pos->prev)
-
-/**
- * list_for_each_safe - iterate over a list safe against removal of list entry
- * @pos:  the &struct list_head to use as a loop counter.
- * @n:    another &struct list_head to use as temporary storage
- * @head: the head for your list.
- */
-#define list_for_each_safe(pos, n, head) \
-  for (pos = (head)->next, n = pos->next; pos != (head); \
-    pos = n, n = pos->next)
-
-/**
- * list_for_each_entry  - iterate over list of given type
- * @pos:  the type * to use as a loop counter.
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- */
-#define list_for_each_entry(pos, head, member)        \
-  for (pos = list_entry((head)->next, typeof(*pos), member);  \
-       &pos->member != (head);          \
-       pos = list_entry(pos->member.next, typeof(*pos), member))
-
-/**
- * list_for_each_entry_reverse - iterate backwards over list of given type.
- * @pos:  the type * to use as a loop counter.
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- */
-#define list_for_each_entry_reverse(pos, head, member)      \
-  for (pos = list_entry((head)->prev, typeof(*pos), member);  \
-       &pos->member != (head);  \
-       pos = list_entry(pos->member.prev, typeof(*pos), member))
-
-/**
- * list_prepare_entry - prepare a pos entry for use as a start point in
- *      list_for_each_entry_continue
- * @pos:  the type * to use as a start point
- * @head: the head of the list
- * @member: the name of the list_struct within the struct.
- */
-#define list_prepare_entry(pos, head, member) \
-  ((pos) ? : list_entry(head, typeof(*pos), member))
-
-/**
- * list_for_each_entry_continue - iterate over list of given type
- *      continuing after existing point
- * @pos:  the type * to use as a loop counter.
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- */
-#define list_for_each_entry_continue(pos, head, member)     \
-  for (pos = list_entry(pos->member.next, typeof(*pos), member);  \
-       &pos->member != (head);  \
-       pos = list_entry(pos->member.next, typeof(*pos), member))
-
-/**
- * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
- * @pos:  the type * to use as a loop counter.
- * @n:    another type * to use as temporary storage
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- */
-#define list_for_each_entry_safe(pos, n, head, member)      \
-  for (pos = list_entry((head)->next, typeof(*pos), member),  \
-    n = list_entry(pos->member.next, typeof(*pos), member); \
-       &pos->member != (head);          \
-       pos = n, n = list_entry(n->member.next, typeof(*n), member))
-
-/**
- * list_for_each_entry_safe_continue -  iterate over list of given type
- *      continuing after existing point safe against removal of list entry
- * @pos:  the type * to use as a loop counter.
- * @n:    another type * to use as temporary storage
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- */
-#define list_for_each_entry_safe_continue(pos, n, head, member)     \
-  for (pos = list_entry(pos->member.next, typeof(*pos), member),    \
-    n = list_entry(pos->member.next, typeof(*pos), member);   \
-       &pos->member != (head);            \
-       pos = n, n = list_entry(n->member.next, typeof(*n), member))
-
-/**
- * list_for_each_entry_safe_reverse - iterate backwards over list of given type safe against
- *              removal of list entry
- * @pos:  the type * to use as a loop counter.
- * @n:    another type * to use as temporary storage
- * @head: the head for your list.
- * @member: the name of the list_struct within the struct.
- */
-#define list_for_each_entry_safe_reverse(pos, n, head, member)    \
-  for (pos = list_entry((head)->prev, typeof(*pos), member),  \
-    n = list_entry(pos->member.prev, typeof(*pos), member); \
-       &pos->member != (head);          \
-       pos = n, n = list_entry(n->member.prev, typeof(*n), member))
-
-
-
-
-/*
- * Double linked lists with a single pointer list head.
- * Mostly useful for hash tables where the two pointer list head is
- * too wasteful.
- * You lose the ability to access the tail in O(1).
- */
-
-struct hlist_head {
-  struct hlist_node *first;
-};
-
-struct hlist_node {
-  struct hlist_node *next, **pprev;
-};
-
-#define HLIST_HEAD_INIT { .first = NULL }
-#define HLIST_HEAD(name) struct hlist_head name = {  .first = NULL }
-#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
-#define INIT_HLIST_NODE(ptr) ((ptr)->next = NULL, (ptr)->pprev = NULL)
-
-static inline int hlist_unhashed(const struct hlist_node *h)
-{
-  return !h->pprev;
-}
-
-static inline int hlist_empty(const struct hlist_head *h)
-{
-  return !h->first;
-}
-
-static inline void __hlist_del(struct hlist_node *n)
-{
-  struct hlist_node *next = n->next;
-  struct hlist_node **pprev = n->pprev;
-  *pprev = next;
-  if (next)
-    next->pprev = pprev;
-}
-
-static inline void hlist_del(struct hlist_node *n)
-{
-  __hlist_del(n);
-  n->next = LIST_POISON1;
-  n->pprev = LIST_POISON2;
-}
-
-
-static inline void hlist_del_init(struct hlist_node *n)
-{
-  if (n->pprev)  {
-    __hlist_del(n);
-    INIT_HLIST_NODE(n);
-  }
-}
-
-static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
-{
-  struct hlist_node *first = h->first;
-  n->next = first;
-  if (first)
-    first->pprev = &n->next;
-  h->first = n;
-  n->pprev = &h->first;
-}
-
-
-
-/* next must be != NULL */
-static inline void hlist_add_before(struct hlist_node *n,
-          struct hlist_node *next)
-{
-  n->pprev = next->pprev;
-  n->next = next;
-  next->pprev = &n->next;
-  *(n->pprev) = n;
-}
-
-static inline void hlist_add_after(struct hlist_node *n,
-          struct hlist_node *next)
-{
-  next->next = n->next;
-  n->next = next;
-  next->pprev = &n->next;
-
-  if(next->next)
-    next->next->pprev  = &next->next;
-}
-
-
-
-#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
-
-#define hlist_for_each(pos, head) \
-  for (pos = (head)->first; pos && ({ prefetch(pos->next); 1; }); \
-       pos = pos->next)
-
-#define hlist_for_each_safe(pos, n, head) \
-  for (pos = (head)->first; pos && ({ n = pos->next; 1; }); \
-       pos = n)
-
-/**
- * hlist_for_each_entry - iterate over list of given type
- * @tpos: the type * to use as a loop counter.
- * @pos:  the &struct hlist_node to use as a loop counter.
- * @head: the head for your list.
- * @member: the name of the hlist_node within the struct.
- */
-#define hlist_for_each_entry(tpos, pos, head, member)      \
-  for (pos = (head)->first;          \
-       pos && ({ prefetch(pos->next); 1;}) &&      \
-    ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
-       pos = pos->next)
-
-/**
- * hlist_for_each_entry_continue - iterate over a hlist continuing after existing point
- * @tpos: the type * to use as a loop counter.
- * @pos:  the &struct hlist_node to use as a loop counter.
- * @member: the name of the hlist_node within the struct.
- */
-#define hlist_for_each_entry_continue(tpos, pos, member)     \
-  for (pos = (pos)->next;            \
-       pos && ({ prefetch(pos->next); 1;}) &&      \
-    ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
-       pos = pos->next)
-
-/**
- * hlist_for_each_entry_from - iterate over a hlist continuing from existing point
- * @tpos: the type * to use as a loop counter.
- * @pos:  the &struct hlist_node to use as a loop counter.
- * @member: the name of the hlist_node within the struct.
- */
-#define hlist_for_each_entry_from(tpos, pos, member)       \
-  for (; pos && ({ prefetch(pos->next); 1;}) &&      \
-    ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
-       pos = pos->next)
-
-/**
- * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
- * @tpos: the type * to use as a loop counter.
- * @pos:  the &struct hlist_node to use as a loop counter.
- * @n:    another &struct hlist_node to use as temporary storage
- * @head: the head for your list.
- * @member: the name of the hlist_node within the struct.
- */
-#define hlist_for_each_entry_safe(tpos, pos, n, head, member)      \
-  for (pos = (head)->first;          \
-       pos && ({ n = pos->next; 1; }) &&         \
-    ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
-       pos = n)
-
-
-#endif
diff --git a/provision-ubuntu.sh b/provision-ubuntu.sh
index b9ffcb4..4ab296a 100644
--- a/provision-ubuntu.sh
+++ b/provision-ubuntu.sh
@@ -1,2 +1,5 @@
 #! /usr/bin/env sh
-apt-get install -y clang libssl-dev nasm
+apt-get install -y \
+  clang \
+  libssl-dev \
+  nasm
diff --git a/run.py b/run.py
old mode 100644
new mode 100755
index 137c0c3..7a20037
--- a/run.py
+++ b/run.py
@@ -1,51 +1,44 @@
 #! /usr/bin/env python3
-# encoding: utf-8
+
+from random import randint
+import binascii
+import ctypes
 import logging
 import os
-import shutil
 import subprocess
-import binascii
-import random
 
+logging.getLogger(__name__)
 
-class Sins():
-    logger = logging.getLogger()
+class Sins:
+    seed = bytes()
 
-    def __init__(self, parent, seed=None, run_dir=None):
-        self.parent = os.path.abspath(parent)
-        if not os.path.isfile(parent):
-            raise ValueError('Invalid executable image path.')
+    def __init__(self, *, parent: str, seed: str=str(), run_dir: str=str()):
+        self.parent = ctypes.CDLL(parent)
+        self.parent.gen_fork.restype = ctypes.c_int
+        self.parent.gen_fork.argtypes = [ctypes.c_void_p, ctypes.c_void_p]
 
-        self.seed = os.path.abspath(seed)
+        if seed:
+            with open(seed, 'rb') as seed_file:
+                self.seed = seed_file.read()
 
-        self.run_dir = os.path.abspath(run_dir)
+        try:
+            os.mkdir(run_dir)
+        except FileNotFoundError or PermissionError:
+            run_dir = os.path.dirname(self.seed)
+        except FileExistsError:
+            pass
 
-        if not os.path.isdir(self.run_dir):
-            try:
-                os.mkdir(self.run_dir)
-            except:
-                self.run_dir = os.path.dirname(self.seed)
+        self.run_dir = run_dir
 
-        shutil.copy2(self.seed, self.run_dir)
+        child = self.generation(
+            parent=self.parent,
+            scrap=self.seed,
+            cwd=self.run_dir)
 
-        parsed = (self.parent, self.seed, self.run_dir)
-        self.logger.info('init path: {}'.format(parsed))
+        if child:
+            logging.info(child)
 
-        paths = (self.seed,)
-        while True:
-            for path in paths:
-                scrap_path = os.path.join(self.run_dir, path)
-                if os.path.isfile(scrap_path):
-                    child = self.generation(
-                        self.parent,
-                        scrap_path,
-                        self.run_dir
-                    )
-                    if child:
-                        print(child)
-            # paths = sorted(os.listdir(self.run_dir))
-
-    def scrap_recent(self, run_dir):
+    def scrap_recent(self, *, run_dir: str)->str:
         scraps = sorted(os.listdir(run_dir))
 
         if scraps:
@@ -53,27 +46,20 @@ class Sins():
 
         return None
 
-    def generation(self, parent, scrap, cwd):
-        with open(scrap, 'rb') as scrap_file:
-            scrap_bin = scrap_file.read()
+    def generation(self, *, parent: ctypes.CDLL, scrap: bytes, cwd: str):
+        offset = randint(0, len(scrap))
+        flip = randint(0, 255)
+        scrap_len = len(scrap)
 
-        scrap_hex = binascii.b2a_hex(scrap_bin).upper()
-        offset = random.randint(0, len(scrap_hex))
-        flip = random.randint(0, 255)
+        logging.info('scrap_length [{}]'.format(scrap_len))
+        logging.info('scrap\n{}'.format(binascii.b2a_hex(scrap)))
 
-        self.logger.debug(
-            'generation: {}'.format((parent, scrap_hex, offset, flip, cwd))
-        )
+        status = parent.gen_fork(scrap, scrap_len)
 
-        proc = subprocess.run(
-            [parent, scrap_hex, str(offset), str(flip)],
-            cwd=cwd,
-            stdout=subprocess.PIPE
-        )
+        logging.info('status {}'.format(status))
+        logging.info('scrap_length [{}]'.format(scrap_len))
+        logging.info('scrap\n{}'.format(binascii.b2a_hex(scrap)))
 
-        if proc.stdout:
-            child_hex = binascii.a2b_hex(proc.stdout)
-            return child_hex
 
 
 def hex_dumps(scrap_dir):
@@ -103,8 +89,7 @@ if __name__ == '__main__':
     import sys
 
     parser = argparse.ArgumentParser(
-        description='position independent code (PIC) mutation experiment.'
-    )
+        description='position independent code (PIC) mutation experiment.')
     parser.add_argument('--verbose', '-v', action='count')
     parser.add_argument('-build', action='store_true',
                         help='build parent and seed PIC image, exit.')
@@ -113,8 +98,8 @@ if __name__ == '__main__':
     parser.add_argument('-logfile', help='log to file.')
     parser.add_argument('-seed', default='build/seed.asm.2.o',
                         help='path to PIC image.')
-    parser.add_argument('-parent', default='build/generation',
-                        help='path to parent process.')
+    parser.add_argument('-parent', default='build/libgeneration.so',
+                        help='path to generation lib.')
     parser.add_argument('-dir', default='sandbox',
                         help='path to execution directory.')
     parser.add_argument('-dumps', action='store_true',
@@ -122,27 +107,19 @@ if __name__ == '__main__':
     args = parser.parse_args()
 
     logger = logging.getLogger()
-    formatter = logging.Formatter(
-        '# %(asctime)s %(levelname)s\n%(message)s\n'
-    )
+    logger.setLevel(logging.DEBUG) if args.verbose else logger.setLevel(logging.INFO)
+    formatter = logging.Formatter('# %(filename)s:%(lineno)s\n%(message)s')
 
-    if args.verbose:
-        logger.setLevel(logging.DEBUG)
-    else:
-        print('Verbose not set, running in silence.')
+    stream_handler = logging.StreamHandler()
+    stream_handler.setFormatter(formatter)
+    logger.addHandler(stream_handler)
 
     if args.logfile:
         file_handler = logging.FileHandler(args.logfile, 'a')
         file_handler.setFormatter(formatter)
-        logger.setLevel(logging.DEBUG)
         logger.addHandler(file_handler)
-    else:
-        stream_handler = logging.StreamHandler()
-        stream_handler.setFormatter(formatter)
-        logger.setLevel(logging.INFO)
-        logger.addHandler(stream_handler)
 
-    logger.info('run: {}'.format(args))
+    logging.info(args)
 
     if args.provision:
         provision = ['sudo', 'sh', 'provision-ubuntu.sh']
@@ -155,9 +132,10 @@ if __name__ == '__main__':
     elif args.build:
         waf = [sys.executable, 'waf.py', 'build']
         waf_proc = subprocess.run(waf)
-        logger.info(waf_proc.stdout)
+        logging.info(waf_proc.stdout)
 
     elif args.dumps:
         hex_dumps(args.dir)
+
     else:
         sins = Sins(parent=args.parent, seed=args.seed, run_dir=args.dir)
diff --git a/wscript b/wscript
index d677c1a..682663d 100644
--- a/wscript
+++ b/wscript
@@ -14,7 +14,7 @@ def configure(conf):
 
 
 def build(bld):
-    bld.program(
+    bld.shlib(
         source='generation.c',
         target='generation',
         cflags=['-g', '-std=gnu11']