Get Key State in linux C - c

Question

OK ive searched about for quite some time now but i simply cannot find a replacement for the GetKeyState() function in linux. All i need and want is to simply poll the arrow keys, and if they are pressed, execute something. My home PC is linux based and my students' PC is windows based, so when i worked in that, i wrote this code:
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <dos.h>
#include <windows.h>
int x; int y, redraw;
int i; int l, xm, ym, op, as, b, ab;
short int display[10][10];
void draw() {
if (redraw == 1) {
system("cls");
while (l < 10) {
while (i<10) {
if (display[i][l] == 0) { printf("="); }
if (display[i][l] == 1) { printf("X"); }
if (display[i][l] == 2) { printf("w"); }
if (display[i][l] == 3) { printf("0"); }
if (display[i][l] == 4) { printf("#"); }
if (display[i][l] == 5) { printf("M"); }
if (display[i][l] == 6) { printf("H"); }
if (display[i][l] == 7) { printf("8"); }
printf("|");
i++;
}
i = 0;
printf("\n");
printf("-+-+-+-+-+-+-+-+-+-+");
printf("\n");
l++;
}
l = 0;
redraw = 0;
}
}
void getkeys() {
while (b == 0) {
if (GetKeyState(VK_LEFT) & 0x8000)
{
xm = -1;
b = 1;
}
if (GetKeyState(VK_RIGHT) & 0x8000)
{
xm = 1;
b = 1;
}
if (GetKeyState(VK_UP) & 0x8000)
{
ym = -1;
b = 1;
}
if (GetKeyState(VK_DOWN) & 0x8000)
{
ym = 1;
b = 1;
}
if (GetKeyState(VK_BACK) & 0x8000)
{
op = -1;
b = 1;
}
if (GetKeyState(VK_RETURN) & 0x8000)
{
op = 1;
b = 1;
}
} b = 0; redraw = 1;
}
void cursor() {
display[x][y] = as;
x = x + xm;
xm = 0;
y = y + ym;
ym = 0;
if (x >9) { x = 0; }
if (y >9) { y = 0; }
if (x <0) { x = 9; }
if (y <0) { y = 9; }
ab = display[x][y];
as = ab;
if (as == 0) {
display[x][y] = 4;
}
if (as == 1) {
display[x][y] = 5;
}
if (as == 2) {
display[x][y] = 6;
}
if (as == 3) {
display[x][y] = 7;
}
Sleep(100);
}
void main()
{
while (i < 10) {
while (l<10) { display[l][i] = rand() % 4; l++; } l = 0; i++;
}
redraw = 1;
while (1) {
draw();
getkeys();
b = 0;
cursor();
}
}
now this basically prints an array and a cursor on it, but it does use the GetKeyState() function and i just can not find an alternative to it on linux. So is there any simple alternative to the mentioned function and is it possible to make the source code multiplatform somehow? Thanks in advance.