/*
 * getlogin.c
 *
 * Print information on login name and terminal, to demonstrate
 * the thread-safe functions.
 */
#include <limits.h>
#include "errors.h"

/*
 * If either TTY_NAME_MAX or LOGIN_NAME_MAX are undefined
 * (this means they are "indeterminate" values), assume a
 * reasonable size (for simplicity) rather than using sysconf
 * and dynamically allocating the buffers.
 */
#ifndef TTY_NAME_MAX
# define TTY_NAME_MAX    128
#endif
#ifndef LOGIN_NAME_MAX
# define LOGIN_NAME_MAX  32
#endif
    
int main (int argc, char *argv[])
{
    char login_str[LOGIN_NAME_MAX];
    char stdin_str[TTY_NAME_MAX];
    char cterm_str[L_ctermid], *cterm_str_ptr;
    int status;

    status = getlogin_r (login_str, sizeof (login_str));
    if (status != 0)
        err_abort (status, "Get login");
    cterm_str_ptr = ctermid (cterm_str);
    if (cterm_str_ptr == NULL)
        errno_abort ("Get cterm");
    status = ttyname_r (0, stdin_str, sizeof (stdin_str));
    if (status != 0)
        err_abort (status, "Get stdin");
    printf ("User: %s, cterm: %s, fd 0: %s\n",
        login_str, cterm_str, stdin_str);
    return 0;
}