Implicit declaration of function 'fork' error (with unistd.h included, on Windows)

Question

Trying to write a simple program involving processes for school, and I keep getting the above error, as well as the same implicit declaration error for pipe commands.

I'm:

• on Windows
• supposed to run POSIX related commands
• using VScode (if applicable)
• using MinGW for my headers and compiling

Here are my headers:

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>

here are just some of the commands being used:

int PtoC[2], CtoP[2];
    pipe(PtoC);
    pipe(CtoP);
    
    int child_pid = fork();

    if(child_pid < 0) {
        exit(1);
    }

The output when I try to compile with gcc:

In function 'main':
digits_sol.c:37:5: warning: implicit declaration of function 'pipe' [-Wimplicit-function-declaration]
     pipe(PtoC);
     ^~~~
digits_sol.c:40:21: warning: implicit declaration of function 'fork' [-Wimplicit-function-declaration]
     int child_pid = fork();

I've tried messing around with my .json settings file to include the unistd.h file

"name": "Win32",
            "includePath": [
                "${workspaceFolder}/**",
                "C:\\MinGW\\include**"
            ],

for some reason, my MinGW folder has a unistd.h in the MinGW\include directory, and also in the MinGW\include\sys directory

I'm not sure why my instructor wouldn't tell me how to run POSIX functions on windows, and I'd appreciate any help.