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@@ -0,0 +1,171 @@
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+
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+ This file is part of the GNU C Library.
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+ Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Library General Public License as
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+ published by the Free Software Foundation; either version 2 of the
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+ License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Library General Public License for more details.
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+
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+ You should have received a copy of the GNU Library General Public
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+ License along with the GNU C Library; see the file COPYING.LIB. If not,
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+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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+ Boston, MA 02111-1307, USA. */
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+
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+#include <errno.h>
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+#include <paths.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <sys/ioctl.h>
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+#include <sys/stat.h>
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+#include <sys/sysmacros.h>
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+#include <termios.h>
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+#include <unistd.h>
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+
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+
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+#define MASTER_P(Dev) \
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+ (major ((Dev)) == 2 \
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+ || (major ((Dev)) == 4 && minor ((Dev)) >= 128 && minor ((Dev)) < 192) \
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+ || (major ((Dev)) >= 128 && major ((Dev)) < 136))
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+
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+
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+#define SLAVE_P(Dev) \
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+ (major ((Dev)) == 3 \
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+ || (major ((Dev)) == 4 && minor ((Dev)) >= 192 && minor ((Dev)) < 256) \
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+ || (major ((Dev)) >= 136 && major ((Dev)) < 144))
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+
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+
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+ terminal devices. As of Linux 2.1.115 these are no longer
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+ supported. They have been replaced by major numbers 2 (masters)
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+ and 3 (slaves). */
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+
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+
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+#define _PATH_DEVPTS "/dev/pts/"
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+
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+
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+extern const char _ptyname1[];
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+extern const char _ptyname2[];
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+
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+
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+static char buffer[sizeof (_PATH_DEVPTS) + 20];
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+
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+
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+extern char *
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+_itoa_word (unsigned long value, char *buflim,
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+ unsigned int base, int upper_case);
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+*/
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+
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+
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+
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+ terminal associated with the master FD is open on in BUF.
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+ Return 0 on success, otherwise an error number. */
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+int ptsname_r (int fd, char *buf, size_t buflen)
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+{
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+ int save_errno = errno;
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+ struct stat st;
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+ int ptyno;
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+
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+ if (buf == NULL)
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+ {
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+ errno = EINVAL;
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+ return EINVAL;
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+ }
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+
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+ if (!isatty (fd))
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+ {
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+ errno = ENOTTY;
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+ return ENOTTY;
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+ }
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+#if 0
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+#ifdef TIOCGPTN
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+ if (ioctl (fd, TIOCGPTN, &ptyno) == 0)
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+ {
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+
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+ `int' of 8 bytes we never need more than 20 digits. */
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+ char numbuf[21];
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+ const char *devpts = _PATH_DEVPTS;
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+ const size_t devptslen = strlen (devpts);
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+ char *p;
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+
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+ numbuf[20] = '\0';
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+ p = _itoa_word (ptyno, &numbuf[20], 10, 0);
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+
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+ if (buflen < devptslen + strlen (p) + 1)
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+ {
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+ errno = ERANGE;
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+ return ERANGE;
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+ }
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+
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+ strcpy (buf, devpts);
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+ strcat (buf, p);
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+ }
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+ else if (errno == EINVAL)
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+#endif
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+#endif
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+ {
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+ char *p;
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+
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+ if (buflen < strlen (_PATH_TTY) + 3)
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+ {
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+ errno = ERANGE;
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+ return ERANGE;
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+ }
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+
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+ if (fstat (fd, &st) < 0)
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+ return errno;
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+
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+
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+ if (! MASTER_P (st.st_rdev))
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+ {
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+ errno = ENOTTY;
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+ return ENOTTY;
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+ }
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+
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+ ptyno = minor (st.st_rdev);
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+
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+ 2.1.115 these are no longer supported. */
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+ if (major (st.st_rdev) == 4)
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+ ptyno -= 128;
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+
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+ if (ptyno / 16 >= strlen (_ptyname1))
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+ {
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+ errno = ENOTTY;
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+ return ENOTTY;
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+ }
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+
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+ strcpy (buf, _PATH_TTY);
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+ p = buf + strlen (buf);
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+ p[0] = _ptyname1[ptyno / 16];
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+ p[1] = _ptyname2[ptyno % 16];
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+ p[2] = '\0';
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+ }
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+
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+ if (_xstat (_STAT_VER, buf, &st) < 0)
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+ return errno;
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+
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+
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+ slave pseudo terminal. */
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+ if (! S_ISCHR (st.st_mode) || ! SLAVE_P (st.st_rdev))
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+ {
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+
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+ errno = ENOTTY;
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+ return ENOTTY;
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+ }
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+
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+ errno = save_errno;
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+ return 0;
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+}
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+
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+
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+ the master FD is open on, or NULL on errors.
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+ The returned storage is good until the next call to this function. */
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+char *
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+ptsname (int fd)
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+{
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+ return ptsname_r (fd, buffer, sizeof (buffer)) != 0 ? NULL : buffer;
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+}
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