tests/test-login_tty.c

   1 /* Test of login_tty() function.
   2    Copyright (C) 2010-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 /* Specification.  */
  20 #include <utmp.h>
  21
  22 #include <errno.h>
  23 #include <pty.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <termios.h>
  27 #include <unistd.h>
  28
  29 #include "ignore-value.h"
  30
  31 int
  32 main ()
  33 {
  34   int master;
  35   int slave;
  36
  37   /* Open a pseudo-terminal, as a master-slave pair.  */
  38   {
  39     int res = openpty (&master, &slave, NULL, NULL, NULL);
  40     if (res != 0)
  41       {
  42         fprintf (stderr, "openpty returned %d\n", res);
  43         return 1;
  44       }
  45   }
  46
  47   /* Create a new session and make it the controlling tty of this session.  */
  48   {
  49     int res = login_tty (slave);
  50     if (res < 0)
  51       {
  52         fprintf (stderr, "login_tty failed\n");
  53         return 1;
  54       }
  55   }
  56
  57   /* From here on, we cannot use stderr for error messages any more.
  58      If a test fails, write error information into a file named 'err',
  59      then abort.  */
  60
  61   /* Check that fd = 0, 1, 2 are now open to the controlling terminal for the
  62      current process and that it is a session of its own.  */
  63   {
  64     int fd;
  65     for (fd = 0; fd < 3; fd++)
  66       if (!(tcgetpgrp (fd) == getpid ()))
  67         {
  68           ignore_value (freopen ("err", "w+", stderr));
  69           fprintf (stderr, "tcgetpgrp(%d) = %ld whereas getpid() = %ld\n",
  70                    fd, (long) tcgetpgrp (fd), (long) getpid ());
  71           fflush (stderr);
  72           abort ();
  73         }
  74     for (fd = 0; fd < 3; fd++)
  75       {
  76         pid_t sid = tcgetsid (fd);
  77         if (sid == -1)
  78           {
  79             if (!(errno == ENOSYS))
  80               {
  81                 ignore_value (freopen ("err", "w+", stderr));
  82                 fprintf (stderr, "tcgetsid(%d) = -1 and errno = %d\n",
  83                          fd, errno);
  84                 fflush (stderr);
  85                 abort ();
  86               }
  87           }
  88         else
  89           {
  90             if (!(sid == getpid ()))
  91               {
  92                 ignore_value (freopen ("err", "w+", stderr));
  93                 fprintf (stderr, "tcgetsid(%d) = %ld whereas getpid() = %ld\n",
  94                          fd, (long) tcgetsid (fd), (long) getpid ());
  95                 fflush (stderr);
  96                 abort ();
  97               }
  98           }
  99       }
 100   }
 101
 102   return 0;
 103 }