Question

I have a code in which am trying to use outportb(), but while compiling it on MinGw i am getting below error.

C:\Users\A_TOMAR\AppData\Local\Temp\ccYPvctv.o:dsp.c:(.text+0x68): undefined reference to `outportb'

#include <stdio.h>
#include <stdlib.h>
#include <dos.h>

int main(void)
{
  outportb(0x378,0xFF);
  return 0;
} 

I would like to know which header file is having this particular function?

Answer 1

1. Windows doesn’t provide access to a hardware. You should use Win32 API calls.
2. This function is DOS specific and unavailable in Windows

Googling shows that your solution is inpout32.dll (example with weird font color)