getlogin

// title: login
// ide: apple xcode
// author: paulogp


#include <stdio.h>
#include <unistd.h>

int main (int argc, const char * argv[])
{
    // shall return a pointer to a string containing the user name associated
    // by the login activity with the controlling terminal of the current process.
    // if getlogin() returns a non-null pointer, then that pointer points to the
    // name that the user logged in under, even if there are several login names
    // with the same user ID.
    printf("username: %s\n", getlogin());

    return 0;
}