sysdeps/mach/hurd/ttyname_r.c

   1 /* Copyright (C) 1994-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <hurd.h>
  22 #include <hurd/term.h>
  23 #include <hurd/fd.h>
  24
  25 /* Store at most BUFLEN characters of the pathname of the terminal FD is
  26    open on in BUF.  Return 0 on success, -1 otherwise.  */
  27 int
  28 __ttyname_r (int fd, char *buf, size_t buflen)
  29 {
  30   error_t err;
  31   char nodename[1024];  /* XXX */
  32   size_t len;
  33
  34   nodename[0] = '\0';
  35   if (err = HURD_DPORT_USE (fd, __term_get_nodename (port, nodename)))
  36     {
  37       if (err == MIG_BAD_ID || err == EOPNOTSUPP)
  38         err = ENOTTY;
  39       return __hurd_dfail (fd, err), errno;
  40     }
  41
  42   len = strlen (nodename) + 1;
  43   if (len > buflen)
  44     {
  45       errno = ERANGE;
  46       return errno;
  47     }
  48
  49   memcpy (buf, nodename, len);
  50   return 0;
  51 }
  52
  53 weak_alias (__ttyname_r, ttyname_r)