/*
 * Test the getuid functions.
 * gcc -o getuid-test getuid-test.c
 * sudo chown root getuid-test
 * sudo chmod +s getuid-test
 * ./getuid-test
*/
# include <stdio.h>

int main(void)
{
        int GETUID=getuid(), GETGID=getgid();
        int GETEUID=geteuid(), GETEGID=getegid();

        printf("Your real user ID is %d\n", GETUID);
        printf("Your real group ID is %d\n", GETGID);
        printf("Your effective user ID is %d\n", GETEUID);
        printf("Your effective group ID is %d\n", GETEGID);

        return 0;
}