sysdeps/mach/hurd/ttyname_r.c

   1 /* Copyright (C) 1994, 1995, 1996 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <unistd.h>
  22 #include <hurd.h>
  23 #include <hurd/term.h>
  24 #include <hurd/fd.h>
  25
  26 /* Store at most BUFLEN characters of the pathname of the terminal FD is
  27    open on in BUF.  Return 0 on success, -1 otherwise.  */
  28 int
  29 ttyname_r (int fd, char *buf, size_t buflen)
  30 {
  31   error_t err;
  32   char nodename[1024];  /* XXX */
  33   char *cp;
  34   size_t len;
  35
  36   nodename[0] = '\0';
  37   if (err = HURD_DPORT_USE (fd, __term_get_nodename (port, nodename)))
  38     return __hurd_dfail (fd, err), -1;
  39
  40   len = strlen (nodename) + 1;
  41   if (len > buflen)
  42     {
  43       errno = EINVAL;
  44       return -1;
  45     }
  46
  47   memcpy (buf, nodename, len);
  48   return 0;
  49 }