diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..06c301b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+.venv/
+dist
+openbsd.egg-info/
+__pycache__
+
+*.pyc
+*.o
+*.so
+
diff --git a/Makefile b/Makefile
index 19aef5b..0240788 100644
--- a/Makefile
+++ b/Makefile
@@ -13,4 +13,5 @@ release: clean build
 	twine upload dist/*
 
 clean:
-	rm -rf dist build openbsd.egg-info/
+	rm -rf dist build openbsd.egg-info/ 
+	rm -rf openbsd/__pycache__ openbsd/_openbsd.c openbsd/*.o openbsd/*.so
diff --git a/README.md b/README.md
index 6633325..790a21b 100644
--- a/README.md
+++ b/README.md
@@ -4,9 +4,14 @@ Python bindings for some OpenBSD-specific APIs. Currently the following are supp
 
 * `pledge`
 * `unveil`
+* `get_cpu_count` (via `sysctl`)
 
 ## Change Log
 
+### v0.2.0 (2025-09-07)
+
+    * Added the `get_cpu_count()` function
+
 ### v0.1.0 (2019-05-03)
 
     * Initial release.
@@ -25,18 +30,18 @@ Openbsd is on PyPI. You can install it using pip:
 ## Usage
 
 Import `openbsd` first:
-```python
+~~~python
 import openbsd
-```
+~~~
 
 ### pledge
 
 See: https://man.openbsd.org/pledge.2
 
-```python
+~~~python
 openbsd.pledge("stdio rpath")
 print(open("/etc/resolv.conf"))
-```
+~~~
 
 Try removing the`rpath permission.
 
@@ -44,15 +49,21 @@ Try removing the`rpath permission.
 
 See: https://man.openbsd.org/unveil.2
 
-```python
+~~~python
 openbsd.unveil("/etc", "r")
 print(open("/etc/resolv.conf"))
-```
+~~~
 
 Try opening `/bin/ksh`.
 
 Use `openbsd.unveil()` to lock down restrictions.
 
+### get_cpu_count
+
+~~~python
+cpu_count = openbsd.get_cpu_count()
+~~~
+
 
 ## Similar Projects
 
@@ -60,6 +71,6 @@ Use `openbsd.unveil()` to lock down restrictions.
 
 ## License
 
-(c) 2019 Yuce Tekol
+(c) 2019-2025 Yuce Tekol
 
 [BSD](LICENSE)
diff --git a/openbsd/__init__.py b/openbsd/__init__.py
index e73753b..274b357 100644
--- a/openbsd/__init__.py
+++ b/openbsd/__init__.py
@@ -1,8 +1,12 @@
 
 import sys
 import os
+from typing import Any
+
 from cffi import FFI
-from ._openbsd import lib as _lib
+
+from openbsd._openbsd import lib as _lib
+from openbsd.const import CTL_HW, HW_NCPU
 
 __all__ = ["pledge", "unveil"]
 _ffi = FFI()
@@ -46,17 +50,31 @@ def unveil(path=None, permissions=None):
         raise OSError(errno, os.strerror(errno))
 
 
-if isinstance(b"openbsd", str):
-    # Python 2
-    def _encode(text):
-        if isinstance(text, unicode):
-            return text.encode("ascii")
-        return text
-else:
-    # Python 3
-    def _encode(text):
-        if isinstance(text, str):
-            return text.encode("ascii")
-        return text
+def _sysctl(mib: list[int], ret_type:str, ret_size:int, set_type=None, set_size=0) -> Any:
+    if set_type:
+        raise ValueError("set_type is not supported")
+    else:
+        set_type = _ffi.NULL
+    fmib = _ffi.new("int[]", mib)
+    value = _ffi.new(ret_type)
+    size = _ffi.new("size_t*", ret_size)
+    ret = _lib.sysctl(fmib, len(mib), value, size, set_type, set_size)
+    if ret < 0:
+        errno = _ffi.errno
+        raise OSError(errno, os.strerror(errno))
+    return value[0]
+    
+
+def get_cpu_count() -> int:
+    """Return CPU count."""
+    # TODO: find ptr_size auto
+    ptr_size = 8
+    return _sysctl([CTL_HW, HW_NCPU], "int*", ptr_size)
+
+
+def _encode(text):
+    if isinstance(text, str):
+        return text.encode("ascii")
+    return text
 
 
diff --git a/openbsd/const.py b/openbsd/const.py
new file mode 100644
index 0000000..c1a6ca1
--- /dev/null
+++ b/openbsd/const.py
@@ -0,0 +1,3 @@
+
+CTL_HW = 6
+HW_NCPU = 3
diff --git a/openbsd/openbsd_builder.py b/openbsd/openbsd_builder.py
index 7778796..537e204 100644
--- a/openbsd/openbsd_builder.py
+++ b/openbsd/openbsd_builder.py
@@ -5,11 +5,17 @@
 ffibuilder.cdef('''
     int pledge(const char *promises, const char *execpromises);
     int unveil(const char *path, const char *permissions);
+    int sysctl(const int *name, unsigned namelen, void *oldp, size_t *oldlenp,
+         void *newp, size_t newlen);
+    void perror(const char *string);
 ''')
 
 ffibuilder.set_source("openbsd._openbsd",
 """
+    #include <stdio.h>
     #include <unistd.h>
+    #include <sys/types.h>
+    #include <sys/sysctl.h>
 """)
 
 if __name__ == "__main__":
diff --git a/requirements.txt b/requirements.txt
index 3226321..4ccd796 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-cffi==1.12.3
-pycparser==2.19
+cffi==1.17.1
+pycparser==2.22
diff --git a/setup.py b/setup.py
index 3b9a1c4..0daf0b6 100644
--- a/setup.py
+++ b/setup.py
@@ -1,17 +1,14 @@
 # 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",
+      version="0.2.0",
       url="",
       download_url="https://github.com/yuce/pyopenbsd",
       author="Yuce Tekol",
@@ -22,9 +19,9 @@
       license="BSD",
       packages=["openbsd"],
       keywords=["OpenBSD"],
-      setup_requires=["cffi>=1.12.3"],
+      setup_requires=["cffi>=1.17.1"],
       cffi_modules=["openbsd/openbsd_builder.py:ffibuilder"],
-      install_requires=["cffi>=1.12.3"],
+      install_requires=["cffi>=1.17.1"],
       tests_require=["pytest", "pytest-cov"],
       classifiers=[
         "Development Status :: 3 - Alpha",
@@ -34,7 +31,6 @@
         "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.6",
         "Operating System :: POSIX :: BSD :: OpenBSD",
-        "License :: OSI Approved :: BSD License",
     ],
 
 )