使用 Python ctypes 调用 rs232.c 时如何解决分段错误问题?

I build the rs232.c as a shared library and try to use python3 to call it. But I got the "Segmentation fault" error when try to get the attributes of com port, tcgetattr(). Anyone know what's this problem? my os system is raspberry pi p3.

testcom.py

from ctypes import *
comdll = cdll.LoadLibrary("rs232.so")
comdll.RS232_OpenComport(c_int(22),c_int(115200),c_char_p(b'8N1'))

rs232.c

#include <termios.h>
#include <unistd.h>
#define RS232_PORTNR  39
int Cport[RS232_PORTNR],error;
struct termios old_port_settings[RS232_PORTNR];

int RS232_OpenComport(int comport_number, int baudrate, const char *mode)
{
    error = tcgetattr(Cport[comport_number], old_port_settings + comport_number); //segmentation fault at this line
    return error;
}

解决方案

问题是您将变量命名为 error 并使其成为全局变量.作为 GNU 扩展，glibc 添加了一个名为error，你的库最终混淆了两者，并试图将 tcgetattr 的返回值写入名为 error 的函数上.要修复它，请将 error 重命名为其他名称，将其声明为 static，或将其声明移至 RS232_OpenCompport.