如何在python中调用linux syscall PROCESS_VM_READV？

import ctypes

libc = ctypes.CDLL("libc.so.6")

pid_t = ctypes.c_int
struct_iovec = ctypes.Structure  # 根据实际情况定义struct_iovec的结构体
ssize_t = ctypes.c_ssize_t

libc.process_vm_readv.argtypes = [pid_t, ctypes.POINTER(struct_iovec), ctypes.c_ulong, ctypes.POINTER(struct_iovec), ctypes.c_ulong, ssize_t]
libc.process_vm_readv.restype = ssize_t

def process_vm_readv(pid, local_iov, remote_iov, flags=0):
    return libc.process_vm_readv(pid, local_iov, 1, remote_iov, 1, flags)

local_iov = struct_iovec()
local_iov.iov_base = ctypes.create_string_buffer(100)  # 本地内存地址
local_iov.iov_len = 100  # 读取的长度

remote_iov = struct_iovec()
remote_iov.iov_base = ctypes.c_void_p(0x12345678)  # 目标进程内存地址
remote_iov.iov_len = 100  # 读取的长度

pid = 1234  # 目标进程的进程ID

result = process_vm_readv(pid, ctypes.pointer(local_iov), ctypes.pointer(remote_iov))
if result > 0:
    data = local_iov.iov_base.raw[:result]
    print("Read data:", data)
else:
    print("Failed to read memory.")