slock code snippet

#ifndef HAVE_BSD_AUTH
static const char *
get_password() { /* only run as root */
        const char *rval;
        struct passwd *pw;

        if(geteuid() != 0)
                die("slock: cannot retrieve password entry (make sure to suid slock)\n");
        pw = getpwuid(getuid());
        endpwent();
        rval =  pw->pw_passwd;

#if HAVE_SHADOW_H
        {
                struct spwd *sp;
                sp = getspnam(getenv("USER"));
                endspent();
                rval = sp->sp_pwdp;
        }
#endif

        /* drop privileges */
        if(setgid(pw->pw_gid) < 0 || setuid(pw->pw_uid) < 0)
                die("slock: cannot drop privileges\n");
        return rval;
}
#endif