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#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <assert.h>
#include <string.h>

int getch(void);

int main(void)
{
        char ch;       
        printf("Input a char:");
        fflush(stdin);
        ch = getch();
        printf("\nYou input a %c\n", ch);
        return 0;
}

int getch(void) 
{
        int c=0;
        struct termios org_opts, new_opts;
        int res=0;
        //-----  store old settings -----------
        res=tcgetattr(STDIN_FILENO, &org_opts);
        assert(res==0);
        //---- set new terminal parms --------
        memcpy(&new_opts, &org_opts, sizeof(new_opts));
        new_opts.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHOK | ECHONL | ECHOPRT | ECHOKE | ICRNL);
        tcsetattr(STDIN_FILENO, TCSANOW, &new_opts);
        c=getchar();
            //------  restore old settings ---------
        res=tcsetattr(STDIN_FILENO, TCSANOW, &org_opts);assert(res==0);
        return c;
}