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;
}
struct utmp *
__getutline (const struct utmp *line)
{
struct utmp *result;
if (buffer == NULL)
{
buffer = (struct utmp *) malloc (sizeof (struct utmp));
if (buffer == NULL)
return NULL;
}
if (__getutline_r (line, buffer, &result) < 0)
return NULL;
return result;
}
int
getutline32_r (const struct utmp32 *line,
struct utmp32 *buffer, struct utmp32 **result)
{
struct utmp in64;
struct utmp out64;
struct utmp *out64p;
int ret;
utmp_convert32to64 (line, &in64);
ret = __getutline_r (&in64, &out64, &out64p);
if (ret == -1)
{
*result = NULL;
return -1;
}
utmp_convert64to32 (out64p, buffer);
*result = buffer;
return 0;
}
