login/openpty.c

   1 /* Copyright (C) 1998 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1998.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <fcntl.h>
  21 #include <pty.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <termios.h>
  25 #include <unistd.h>
  26 #include <sys/types.h>
  27
  28 #include "pty-internal.h"
  29
  30 int
  31 openpty (pmast, pslave, pname, tio, wins)
  32      int *pmast;
  33      int *pslave;
  34      char *pname;
  35      struct termios *tio;
  36      struct winsize *wins;
  37 {
  38   int pfd, tfd;
  39   char name[PTYNAMELEN];
  40
  41   pfd = getpt ();
  42   if (pfd == -1)
  43     return -1;
  44
  45   if (grantpt (pfd))
  46     goto bail;
  47
  48   if (unlockpt (pfd))
  49     goto bail;
  50
  51   if (ptsname_r (pfd, name, PTYNAMELEN) != 0)
  52     goto bail;
  53
  54   tfd = open (name, O_RDWR);
  55   if (tfd == -1)
  56     goto bail;
  57
  58   /* XXX Should we ignore errors here?  */
  59   if(tio)
  60     tcsetattr (tfd, TCSAFLUSH, tio);
  61   if (wins)
  62     ioctl (tfd, TIOCSWINSZ, wins);
  63
  64   *pmast = pfd;
  65   *pslave = tfd;
  66   if (pname != NULL)
  67     strcpy (pname, name);
  68   return 0;
  69
  70 bail:
  71   close (pfd);
  72   return -1;
  73 }