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[thirdparty/glibc.git] / sysdeps / mach / hurd / ttyname_r.c

/* Copyright (C) 1994-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/term.h>
#include <hurd/fd.h>

/* Store at most BUFLEN characters of the pathname of the terminal FD is
   open on in BUF.  Return 0 on success, -1 otherwise.  */
int
__ttyname_r (int fd, char *buf, size_t buflen)
{
  error_t err;
  char nodename[1024];	/* XXX */
  size_t len;

  nodename[0] = '\0';
  if (err = HURD_DPORT_USE (fd, __term_get_nodename (port, nodename)))
    {
      if (err == MIG_BAD_ID || err == EOPNOTSUPP)
        err = ENOTTY;
      return __hurd_dfail (fd, err), errno;
    }

  len = strlen (nodename) + 1;
  if (len > buflen)
    {
      errno = ERANGE;
      return errno;
    }

  memcpy (buf, nodename, len);
  return 0;
}

weak_alias (__ttyname_r, ttyname_r)