libutil/forkpty.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 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 libutil_hidden_proto(openpty)
  27 libutil_hidden_proto(login_tty)
  28
  29 int
  30 forkpty (int *amaster, char *name, struct termios *termp, struct winsize *winp)
  31 {
  32   int master, slave, pid;
  33
  34   if (openpty (&master, &slave, name, termp, winp) == -1)
  35     return -1;
  36
  37   switch (pid = fork ())
  38     {
  39     case -1:
  40       return -1;
  41     case 0:
  42       /* Child.  */
  43       close (master);
  44       if (login_tty (slave))
  45         _exit (1);
  46
  47       return 0;
  48     default:
  49       /* Parent.  */
  50       *amaster = master;
  51       close (slave);
  52
  53       return pid;
  54     }
  55 }