login/forkpty.c

   1 /* Copyright (C) 1998-2022 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <sys/types.h>
  19 #include <termios.h>
  20 #include <unistd.h>
  21 #include <utmp.h>
  22 #include <pty.h>
  23 #include <shlib-compat.h>
  24
  25 int
  26 __forkpty (int *pptmx, char *name, const struct termios *termp,
  27            const struct winsize *winp)
  28 {
  29   int ptmx, terminal, pid;
  30
  31   if (openpty (&ptmx, &terminal, name, termp, winp) == -1)
  32     return -1;
  33
  34   switch (pid = __fork ())
  35     {
  36     case -1:
  37       __close (ptmx);
  38       __close (terminal);
  39       return -1;
  40     case 0:
  41       /* Child.  */
  42       __close (ptmx);
  43       if (login_tty (terminal))
  44         _exit (1);
  45
  46       return 0;
  47     default:
  48       /* Parent.  */
  49       *pptmx = ptmx;
  50       __close (terminal);
  51
  52       return pid;
  53     }
  54 }
  55 versioned_symbol (libc, __forkpty, forkpty, GLIBC_2_34);
  56 libc_hidden_ver (__forkpty, forkpty)
  57
  58 #if OTHER_SHLIB_COMPAT (libutil, GLIBC_2_0, GLIBC_2_34)
  59 compat_symbol (libutil, __forkpty, forkpty, GLIBC_2_0);
  60 #endif