tests/test-fseeko4.c

   1 /* Test of fseeko() 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 fseeko() 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 (ftell (fp) == 0);
  39     ASSERT (fseeko (fp, 0, SEEK_END) == 0);
  40     ASSERT (ftell (fp) > 0);
  41     ASSERT (close (fileno (fp)) == 0);
  42     errno = 0;
  43     ASSERT (fseeko (fp, 0, SEEK_SET) == -1);
  44     ASSERT (errno == EBADF);
  45     #endif
  46     fclose (fp);
  47   }
  48
  49   /* Test that fseeko() sets errno if the stream was constructed with
  50      an invalid file descriptor.  */
  51   {
  52     FILE *fp = fdopen (-1, "w");
  53     if (fp != NULL)
  54       {
  55         errno = 0;
  56         ASSERT (fseeko (fp, 0, SEEK_END) == -1);
  57         ASSERT (errno == EBADF);
  58         fclose (fp);
  59       }
  60   }
  61   {
  62     FILE *fp;
  63     close (99);
  64     fp = fdopen (99, "w");
  65     if (fp != NULL)
  66       {
  67         errno = 0;
  68         ASSERT (fseeko (fp, 0, SEEK_END) == -1);
  69         ASSERT (errno == EBADF);
  70         fclose (fp);
  71       }
  72   }
  73
  74   return test_exit_status;
  75 }