tests/test-ftruncate.c

   1 /* Test truncating a file.
   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 <unistd.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (ftruncate, int, (int, off_t));
  23
  24 #include <errno.h>
  25 #include <fcntl.h>
  26
  27 #include "macros.h"
  28
  29 int
  30 main (_GL_UNUSED int argc, char *argv[])
  31 {
  32   const char *filename = argv[1];
  33
  34   /* Test behaviour for invalid file descriptors.  */
  35   {
  36     errno = 0;
  37     ASSERT (ftruncate (-1, 0) == -1);
  38     ASSERT (errno == EBADF);
  39   }
  40   {
  41     close (99);
  42     errno = 0;
  43     ASSERT (ftruncate (99, 0) == -1);
  44     ASSERT (errno == EBADF);
  45   }
  46
  47   /* Test behaviour for read-only file descriptors.  */
  48   {
  49     int fd = open (filename, O_RDONLY);
  50     ASSERT (fd >= 0);
  51     errno = 0;
  52     ASSERT (ftruncate (fd, 0) == -1);
  53     ASSERT (errno == EBADF || errno == EINVAL
  54             || errno == EACCES /* seen on mingw */
  55            );
  56     close (fd);
  57   }
  58
  59   return test_exit_status;
  60 }