login/forkpty.c

   1 /* Copyright (C) 1998, 2007 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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sys/types.h>
  21 #include <termios.h>
  22 #include <unistd.h>
  23 #include <utmp.h>
  24 #include <pty.h>
  25
  26 int
  27 forkpty (amaster, name, termp, winp)
  28      int *amaster;
  29      char *name;
  30      const struct termios *termp;
  31      const struct winsize *winp;
  32 {
  33   int master, slave, pid;
  34
  35   if (openpty (&master, &slave, name, termp, winp) == -1)
  36     return -1;
  37
  38   switch (pid = fork ())
  39     {
  40     case -1:
  41       close (master);
  42       close (slave);
  43       return -1;
  44     case 0:
  45       /* Child.  */
  46       close (master);
  47       if (login_tty (slave))
  48         _exit (1);
  49
  50       return 0;
  51     default:
  52       /* Parent.  */
  53       *amaster = master;
  54       close (slave);
  55
  56       return pid;
  57     }
  58 }