login/forkpty.c

   1 /* Copyright (C) 1998-2021 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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <sys/types.h>
  20 #include <termios.h>
  21 #include <unistd.h>
  22 #include <utmp.h>
  23 #include <pty.h>
  24 #include <shlib-compat.h>
  25
  26 int
  27 __forkpty (int *pptmx, char *name, const struct termios *termp,
  28            const struct winsize *winp)
  29 {
  30   int ptmx, terminal, pid;
  31
  32   if (openpty (&ptmx, &terminal, name, termp, winp) == -1)
  33     return -1;
  34
  35   switch (pid = __fork ())
  36     {
  37     case -1:
  38       __close (ptmx);
  39       __close (terminal);
  40       return -1;
  41     case 0:
  42       /* Child.  */
  43       __close (ptmx);
  44       if (login_tty (terminal))
  45         _exit (1);
  46
  47       return 0;
  48     default:
  49       /* Parent.  */
  50       *pptmx = ptmx;
  51       __close (terminal);
  52
  53       return pid;
  54     }
  55 }
  56 versioned_symbol (libc, __forkpty, forkpty, GLIBC_2_34);
  57 libc_hidden_ver (__forkpty, forkpty)
  58
  59 #if OTHER_SHLIB_COMPAT (libutil, GLIBC_2_0, GLIBC_2_34)
  60 compat_symbol (libutil, __forkpty, forkpty, GLIBC_2_0);
  61 #endif