tests/test-ttyname_r.c

   1 /* Test of ttyname_r(3).
   2    Copyright (C) 2010-2020 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 #include <unistd.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (ttyname_r, int, (int, char *, size_t));
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26 #include <stdio.h>
  27 #include <string.h>
  28
  29 #include "macros.h"
  30
  31 int
  32 main (void)
  33 {
  34   int fd;
  35   char buf[100];
  36
  37   /* Open the controlling tty of the current process.  */
  38   fd = open ("/dev/tty", O_RDONLY);
  39   if (fd < 0)
  40     {
  41       fprintf (stderr, "Skipping test: cannot open controlling tty\n");
  42       return 77;
  43     }
  44
  45   ASSERT (ttyname_r (fd, buf, 1) == ERANGE);
  46
  47   ASSERT (ttyname_r (fd, buf, sizeof (buf)) == 0);
  48   ASSERT (memcmp (buf, "/dev/", 5) == 0);
  49
  50   /* Test behaviour for invalid file descriptors.  */
  51   {
  52     int err = ttyname_r (-1, buf, sizeof (buf));
  53     ASSERT (err == EBADF
  54             || err == ENOTTY /* seen on FreeBSD 6.4 */
  55            );
  56   }
  57   {
  58     int err;
  59     close (99);
  60     err = ttyname_r (99, buf, sizeof (buf));
  61     ASSERT (err == EBADF
  62             || err == ENOTTY /* seen on FreeBSD 6.4 */
  63            );
  64   }
  65
  66   return 0;
  67 }