Beispiel #1
0
STATIC
#endif
char *
getlogin (void)
{
  char tty_pathname[2 + 2 * NAME_MAX];
  char *real_tty_path = tty_pathname;
  int err;
  char *result = NULL;
  struct utmp *ut, line, buffer;

  /* Get name of tty connected to fd 0.  Return NULL if not a tty or
     if fd 0 isn't open.  Note that a lot of documentation says that
     getlogin() is based on the controlling terminal---what they
     really mean is "the terminal connected to standard input".  The
     getlogin() implementation of DEC Unix, SunOS, Solaris, HP-UX all
     return NULL if fd 0 has been closed, so this is the compatible
     thing to do.  Note that ttyname(open("/dev/tty")) on those
     systems returns /dev/tty, so that is not a possible solution for
     getlogin().  */
  err = __ttyname_r (0, real_tty_path, sizeof (tty_pathname));
  if (err != 0)
    {
      __set_errno (err);
      return NULL;
    }

  real_tty_path += 5;		/* Remove "/dev/".  */

  __setutent ();
  strncpy (line.ut_line, real_tty_path, sizeof line.ut_line);
  if (__getutline_r (&line, &buffer, &ut) < 0)
    {
      if (errno == ESRCH)
	/* The caller expects ENOENT if nothing is found.  */
	__set_errno (ENOENT);
      result = NULL;
    }
  else
    {
      strncpy (name, ut->ut_user, UT_NAMESIZE);
      name[UT_NAMESIZE] = '\0';
      result = name;
    }

  __endutent ();

  return result;
}
Beispiel #2
0
/* This function must be called with the LOCK held */
static struct utmp *__getutent(int utmp_fd)
{
    struct utmp *ret = NULL;

    if (utmp_fd == -1) {
	__setutent();
    }
    if (utmp_fd == -1) {
	return NULL;
    }

    if (read(utmp_fd, (char *) &static_utmp, sizeof(struct utmp)) == sizeof(struct utmp))
    {
	ret = &static_utmp;
    }

    return ret;
}
Beispiel #3
0
void setutent(void)
{
    __UCLIBC_MUTEX_LOCK(utmplock);
    __setutent();
    __UCLIBC_MUTEX_UNLOCK(utmplock);
}
Beispiel #4
0
void
setutxent (void)
{
  return __setutent ();
}