tests/test-ftello4.c

   1 /* Test of ftello() function.
   2    Copyright (C) 2011-2024 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 #include <stdio.h>
  20
  21 #include <errno.h>
  22 #include <unistd.h>
  23
  24 #include "macros.h"
  25
  26 int
  27 main (int argc, char **argv)
  28 {
  29   const char *filename = argv[1];
  30
  31   /* Test that ftello() sets errno if someone else closes the stream
  32      fd behind the back of stdio.  */
  33   {
  34     FILE *fp = fopen (filename, "r");
  35     ASSERT (fp != NULL);
  36     #if !defined __ANDROID__ /* fdsan */
  37     setvbuf (fp, NULL, _IONBF, 0);
  38     ASSERT (close (fileno (fp)) == 0);
  39     errno = 0;
  40     ASSERT (ftello (fp) == (off_t)-1);
  41     ASSERT (errno == EBADF);
  42     #endif
  43     fclose (fp);
  44   }
  45
  46   /* Test that ftello() sets errno if the stream was constructed with
  47      an invalid file descriptor.  */
  48   {
  49     FILE *fp = fdopen (-1, "w");
  50     if (fp != NULL)
  51       {
  52         errno = 0;
  53         ASSERT (ftello (fp) == (off_t)-1);
  54         ASSERT (errno == EBADF);
  55         fclose (fp);
  56       }
  57   }
  58   {
  59     FILE *fp;
  60     close (99);
  61     fp = fdopen (99, "w");
  62     if (fp != NULL)
  63       {
  64         errno = 0;
  65         ASSERT (ftello (fp) == (off_t)-1);
  66         ASSERT (errno == EBADF);
  67         fclose (fp);
  68       }
  69   }
  70
  71   return test_exit_status;
  72 }