tests/test-openpty.c

   1 /* Test of pty.h and openpty function.
   2    Copyright (C) 2009-2024 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 /* Written by Simon Josefsson <simon@josefsson.org>, 2009
  18    and Bruno Haible <bruno@clisp.org>, 2010.  */
  19
  20 #include <config.h>
  21
  22 #include <pty.h>
  23
  24 #include "signature.h"
  25 SIGNATURE_CHECK (openpty, int, (int *, int *, char *, struct termios const *,
  26                                 struct winsize const *));
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <termios.h>
  31 #include <unistd.h>
  32
  33 int
  34 main ()
  35 {
  36   {
  37 #ifndef _WIN32
  38     int master;
  39     int slave;
  40
  41     /* Open a pseudo-terminal, as a master-slave pair.  */
  42     {
  43       int res = openpty (&master, &slave, NULL, NULL, NULL);
  44       if (res != 0)
  45         {
  46           fprintf (stderr, "openpty returned %d\n", res);
  47           return 1;
  48         }
  49     }
  50
  51     /* Set the terminal characteristics.
  52        On Linux or Mac OS X, they can be set on either the master or the slave;
  53        the effect is the same.  But on Solaris, they have to be set on the
  54        master; tcgetattr on the slave fails.  */
  55     {
  56       int tcfd = slave; /* You can try  tcfd = master;  here.  */
  57       struct termios attributes;
  58
  59       if (tcgetattr (tcfd, &attributes) < 0)
  60         {
  61           fprintf (stderr, "tcgetattr failed\n");
  62           return 1;
  63         }
  64       /* Enable canonical processing, including erase.  */
  65       attributes.c_lflag |= ECHO | ICANON | ECHOE;
  66       attributes.c_cc[VERASE] = '\177';
  67       if (tcsetattr (tcfd, TCSANOW, &attributes) < 0)
  68         {
  69           fprintf (stderr, "tcsetattr failed\n");
  70           return 1;
  71         }
  72     }
  73
  74     /* Write into the master side.  */
  75     {
  76       static const char input[] = "Hello worst\177\177ld!\n";
  77
  78       if (write (master, input, strlen (input)) < (int) strlen (input))
  79         {
  80           fprintf (stderr, "write failed\n");
  81           return 1;
  82         }
  83     }
  84
  85     /* Read from the slave side.  */
  86     {
  87       char buf[100];
  88       int res = read (slave, buf, sizeof (buf));
  89       static const char expected[] = "Hello world!\n";
  90
  91       if (res < 0)
  92         {
  93           fprintf (stderr, "read failed\n");
  94           return 1;
  95         }
  96       if (!(res == strlen (expected)
  97             && memcmp (buf, expected, strlen (expected)) == 0))
  98         {
  99           fprintf (stderr, "read result unexpected\n");
 100           return 1;
 101         }
 102     }
 103
 104     /* Close the master side before the slave side gets closed.
 105        This is necessary on Mac OS X 10.4.11.  */
 106     close (master);
 107 #endif
 108   }
 109
 110   return 0;
 111 }