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diff --git a/LICENSE b/LICENSE
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+++ b/LICENSE
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+Copyright 2019 yuce.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+contributors may be used to endorse or promote products derived
+from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGE.
diff --git a/README.md b/README.md
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+# openbsd
+
+Python bindings for some OpenBSD-specific APIs. Currently the following are supported:
+* `pledge`
+* `unveil`
+
+## Change Log
+
+* **v0.1.0** (2019-05-03)
+    * Initial release.
+
+## Installation
+
+Openbsd is on PyPI. You can install it using pip:
+
+    pip install openbsd
+
+### Prerequisites
+
+* OpenBSD 6.4 or better
+* Python 3.6 or better OR Python 2.7
+
+## Usage
+
+Import `openbsd` first:
+```python
+import openbsd
+```
+
+### pledge
+
+```python
+pledge("stdio rpath")
+print(open("/etc/resolv.conf"))
+```
+
+Try removing `rpath` permission.
+
+### unveil
+
+```python
+unveil("/etc", "r")
+print(open("/etc/resolv.conf"))
+```
+
+Try reading `/bin/ksh`.
+
+## License
+
+(c) 2019 Yuce Tekol
+
+[BSD](LICENSE)
diff --git a/openbsd/__init__.py b/openbsd/__init__.py
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+++ b/openbsd/__init__.py
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+
+import sys
+from cffi import FFI
+from _openbsd import lib as _lib
+
+__all__ = ["pledge", "unveil"]
+
+_ffi = FFI()
+
+
+def pledge(promises=None, execpromises=None):
+    promises = _ffi.NULL if promises is None else _encode(promises)
+    execpromises = _ffi.NULL if execpromises is None else _encode(execpromises)
+    ret = _lib.pledge(promises, execpromises)
+    if ret < 0:
+        errno = _ffi.errno
+        raise OSError(errno, _decode(_ffi.string(_lib.strerror(errno), 256)))
+
+
+def unveil(path=None, permissions=None):
+    path = _ffi.NULL if path is None else _encode(path)
+    permissions = _ffi.NULL if permissions is None else _encode(permissions)
+    ret = _lib.unveil(path, permissions)
+    if ret < 0:
+        errno = _ffi.errno
+        raise OSError(errno, _decode(_ffi.string(_lib.strerror(errno), 256)))
+
+
+if isinstance(b"openbsd", str):
+    # Python 2
+    def _encode(text):
+        if isinstance(text, unicode):
+            return text.encode("ascii")
+        return text
+
+    def _decode(text):
+        return text
+else:
+    # Python 3
+    def _encode(text):
+        if isinstance(text, str):
+            return text.encode("ascii")
+        return text
+
+    def _decode(text):
+        return text.decode("ascii")
+
+
diff --git a/openbsd/openbsd_builder.py b/openbsd/openbsd_builder.py
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+++ b/openbsd/openbsd_builder.py
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+
+from cffi import FFI
+ffibuilder = FFI()
+
+ffibuilder.cdef('''
+    int pledge(const char *promises, const char *execpromises);
+    int unveil(const char *path, const char *permissions);
+    char *strerror(int errnum);
+''')
+
+ffibuilder.set_source("_openbsd",
+"""
+    #include <unistd.h>
+    #include <string.h>
+""")
+
+if __name__ == "__main__":
+    ffibuilder.compile(verbose=True)
+
+
diff --git a/requirements.txt b/requirements.txt
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+++ b/requirements.txt
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+cffi==1.12.3
+pycparser==2.19
diff --git a/setup.py b/setup.py
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+++ b/setup.py
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+# Author: yuce
+# Created on: 2019-05-03, at: 01:50 +0300
+
+import sys
+import os
+import io
+import os.path
+from setuptools import setup
+
+with io.open("README.md", encoding="utf-8") as f:
+    long_description = f.read()
+
+setup(name="openbsd",
+      version="0.1.0",
+      url="",
+      download_url="",
+      author="yuce",
+      author_email="",
+      description="",
+      long_description=long_description,
+      long_description_content_type="text/markdown",
+      license="",
+      packages=["openbsd"],
+      keywords=["OpenBSD"],
+      setup_requires=["cffi>=1.12.3"],
+      cffi_modules=["openbsd/openbsd_builder.py:ffibuilder"],
+      install_requires=["cffi>=1.12.3"],
+      tests_require=["pytest", "pytest-cov"],
+      classifiers=[],
+)