/* Store at most BUFLEN character of the pathname of the terminal FD is
open on in BUF. Return 0 on success, otherwise an error number. */
int
__ttyname_r (int fd, char *buf, size_t buflen)
{
struct stat st;
int dostat = 0;
int save = errno;
int ret;
/* Test for the absolute minimal size. This makes life easier inside
the loop. */
if (!buf)
{
__set_errno (EINVAL);
return EINVAL;
}
if (buflen < (int) (sizeof (dev) + 1))
{
__set_errno (ERANGE);
return ERANGE;
}
if (!__isatty (fd))
{
__set_errno (ENOTTY);
return ENOTTY;
}
if (fstat (fd, &st) < 0)
return errno;
/* Prepare the result buffer. */
memcpy (buf, dev, sizeof (dev) - 1);
buf[sizeof (dev) - 1] = '/';
buflen -= sizeof (dev);
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino, save,
&dostat);
#else
ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino, save,
&dostat);
#endif
if (ret && dostat != -1)
{
dostat = 1;
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (fd, buf, buflen, st.st_rdev, st.st_ino,
save, &dostat);
#else
ret = getttyname_r (fd, buf, buflen, st.st_dev, st.st_ino,
save, &dostat);
#endif
}
return ret;
}
/* Store at most BUFLEN character of the pathname of the terminal FD is
open on in BUF. Return 0 on success, otherwise an error number. */
int
__ttyname_r (int fd, char *buf, size_t buflen)
{
struct stat64 st;
int save = errno;
int ret;
if (buflen < sizeof ("/dev/pty/slv/"))
{
__set_errno (ERANGE);
return ERANGE;
}
if (!__isatty (fd))
{
__set_errno (ENOTTY);
return ENOTTY;
}
if (__fxstat64 (_STAT_VER, fd, &st) < 0)
return errno;
/* Prepare the result buffer. */
memcpy (buf, "/dev/pty/slv/", sizeof ("/dev/pty/slv/"));
buflen -= sizeof ("/dev/pty/slv/") - 1;
ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save);
if (ret)
{
memcpy (buf, "/dev/pty/mst/", sizeof ("/dev/pty/mst/"));
ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save);
}
return ret;
}
/* Store at most BUFLEN character of the pathname of the terminal FD is
open on in BUF. Return 0 on success, otherwise an error number. */
int
__ttyname_r (int fd, char *buf, size_t buflen)
{
char procname[30];
struct stat64 st, st1;
int dostat = 0;
int save = errno;
/* Test for the absolute minimal size. This makes life easier inside
the loop. */
if (!buf)
{
__set_errno (EINVAL);
return EINVAL;
}
if (buflen < sizeof ("/dev/pts/"))
{
__set_errno (ERANGE);
return ERANGE;
}
/* isatty check, tcgetattr is used because it sets the correct
errno (EBADF resp. ENOTTY) on error. */
struct termios term;
if (__glibc_unlikely (__tcgetattr (fd, &term) < 0))
return errno;
if (__fxstat64 (_STAT_VER, fd, &st) < 0)
return errno;
/* We try using the /proc filesystem. */
*_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
ssize_t ret = __readlink (procname, buf, buflen - 1);
if (__glibc_unlikely (ret == -1 && errno == ENAMETOOLONG))
{
__set_errno (ERANGE);
return ERANGE;
}
if (__glibc_likely (ret != -1))
{
#define UNREACHABLE_LEN strlen ("(unreachable)")
if (ret > UNREACHABLE_LEN
&& memcmp (buf, "(unreachable)", UNREACHABLE_LEN) == 0)
{
memmove (buf, buf + UNREACHABLE_LEN, ret - UNREACHABLE_LEN);
ret -= UNREACHABLE_LEN;
}
/* readlink need not terminate the string. */
buf[ret] = '\0';
/* Verify readlink result, fall back on iterating through devices. */
if (buf[0] == '/'
&& __xstat64 (_STAT_VER, buf, &st1) == 0
#ifdef _STATBUF_ST_RDEV
&& S_ISCHR (st1.st_mode)
&& st1.st_rdev == st.st_rdev
#else
&& st1.st_ino == st.st_ino
&& st1.st_dev == st.st_dev
#endif
)
return 0;
}
/* Prepare the result buffer. */
memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/"));
buflen -= sizeof ("/dev/pts/") - 1;
if (__xstat64 (_STAT_VER, buf, &st1) == 0 && S_ISDIR (st1.st_mode))
{
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
&dostat);
#else
ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
&dostat);
#endif
}
else
{
__set_errno (save);
ret = ENOENT;
}
if (ret && dostat != -1)
{
buf[sizeof ("/dev/") - 1] = '\0';
buflen += sizeof ("pts/") - 1;
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
&dostat);
#else
ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
&dostat);
#endif
}
if (ret && dostat != -1)
{
buf[sizeof ("/dev/") - 1] = '\0';
dostat = 1;
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino,
save, &dostat);
#else
ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino,
save, &dostat);
#endif
}
return ret;
}
/* Store at most BUFLEN character of the pathname of the terminal FD is
open on in BUF. Return 0 on success, otherwise an error number. */
int
__ttyname_r (int fd, char *buf, size_t buflen)
{
char procname[30];
struct stat64 st, st1;
int dostat = 0;
int save = errno;
int ret;
/* Test for the absolute minimal size. This makes life easier inside
the loop. */
if (!buf)
{
__set_errno (EINVAL);
return EINVAL;
}
if (buflen < sizeof ("/dev/pts/"))
{
__set_errno (ERANGE);
return ERANGE;
}
/* We try using the /proc filesystem. */
*_fitoa_word (fd, __stpcpy (procname, "/proc/self/fd/"), 10, 0) = '\0';
ret = __readlink (procname, buf, buflen - 1);
if (ret == -1 && errno == ENOENT)
{
__set_errno (EBADF);
return EBADF;
}
if (!__isatty (fd))
{
__set_errno (ENOTTY);
return ENOTTY;
}
if (ret == -1 && errno == ENAMETOOLONG)
{
__set_errno (ERANGE);
return ERANGE;
}
if (ret != -1 && buf[0] != '[')
{
buf[ret] = '\0';
return 0;
}
if (__fxstat64 (_STAT_VER, fd, &st) < 0)
return errno;
/* Prepare the result buffer. */
memcpy (buf, "/dev/pts/", sizeof ("/dev/pts/"));
buflen -= sizeof ("/dev/pts/") - 1;
if (__xstat64 (_STAT_VER, buf, &st1) == 0 && S_ISDIR (st1.st_mode))
{
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
&dostat);
#else
ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
&dostat);
#endif
}
else
{
__set_errno (save);
ret = ENOENT;
}
if (ret && dostat != -1)
{
buf[sizeof ("/dev/") - 1] = '\0';
buflen += sizeof ("pts/") - 1;
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino, save,
&dostat);
#else
ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino, save,
&dostat);
#endif
}
if (ret && dostat != -1)
{
buf[sizeof ("/dev/") - 1] = '\0';
dostat = 1;
#ifdef _STATBUF_ST_RDEV
ret = getttyname_r (buf, buflen, st.st_rdev, st.st_ino,
save, &dostat);
#else
ret = getttyname_r (buf, buflen, st.st_dev, st.st_ino,
save, &dostat);
#endif
}
return ret;
}
