src/pty.c

   1 /* Copyright (c) 2008, 2009
   2  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   3  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   4  *      Micah Cowan (micah@cowan.name)
   5  *      Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
   6  * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
   7  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   8  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   9  * Copyright (c) 1987 Oliver Laumann
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 3, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program (see the file COPYING); if not, see
  23  * https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
  24  * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  25  *
  26  ****************************************************************
  27  */
  28
  29 #include "config.h"
  30
  31 #include "pty.h"
  32
  33 #include <sys/ioctl.h>
  34
  35 #include "screen.h"
  36
  37 #if defined(HAVE_PTY_H)
  38 # include <pty.h>
  39 #endif
  40 #if defined(HAVE_UTIL_H)
  41 # include <util.h>
  42 #endif
  43 #if defined(HAVE_LIBUTIL_H)
  44 # include <libutil.h>
  45 #endif
  46
  47 int pty_preopen = 0;
  48
  49 /***************************************************************/
  50
  51 int OpenPTY(char **ttyn)
  52 {
  53         static char TtyName[32];
  54         int f, s;
  55
  56         if (openpty(&f, &s, TtyName, NULL, NULL) != 0)
  57                 return -1;
  58         close(s);
  59
  60         tcflush(f, TCIOFLUSH);
  61 #if defined(LOCKPTY) && defined(TIOCEXCL) && defined(TIOCNXCL)
  62         (void)ioctl(f, TIOCEXCL, NULL);
  63 #endif
  64
  65         pty_preopen = 1;
  66         *ttyn = TtyName;
  67         return f;
  68 }
  69
  70 int ClosePTY(int fd)
  71 {
  72 #if defined(LOCKPTY) && defined(TIOCEXCL) && defined(TIOCNXCL)
  73         (void)ioctl(fd, TIOCNXCL, NULL);
  74 #endif
  75
  76         return close(fd);
  77 }