使用 Cython 将 malloc 缓冲区从 C 转换为 Python 而不进行复制？

pip install cython

cdef extern from "stdlib.h":
    void* malloc(size_t size)
    void free(void* ptr)

cdef extern from "Python.h":
    object PyBytes_FromStringAndSize(char* s, Py_ssize_t len)

cdef char* create_buffer(size_t size):
    cdef char* buffer = <char*>malloc(size)
    return buffer

cdef void free_buffer(char* buffer):
    free(buffer)

def create_python_buffer(size_t size):
    cdef char* buffer = create_buffer(size)
    cdef object py_buffer = PyBytes_FromStringAndSize(buffer, size)
    free_buffer(buffer)
    return py_buffer

cython --embed cython_example.pyx

gcc -I /usr/include/python2.7 -o cython_example.so cython_example.c -lpython2.7

gcc -I /usr/include/python3.x -o cython_example.so cython_example.c -lpython3.x

from ctypes import cdll

cython_example = cdll.LoadLibrary('./cython_example.so')

buffer = cython_example.create_python_buffer(1024)
print(buffer)