1  /* Verify that realpath returns NULL with ENAMETOOLONG if the result exceeds
       2     NAME_MAX.
       3     Copyright The GNU Toolchain Authors.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #include <errno.h>
      21  #include <limits.h>
      22  #include <stdlib.h>
      23  #include <string.h>
      24  #include <unistd.h>
      25  #include <support/check.h>
      26  #include <support/temp_file.h>
      27  #include <sys/types.h>
      28  #include <sys/stat.h>
      29  
      30  #define BASENAME "tst-realpath-toolong."
      31  
      32  #ifndef PATH_MAX
      33  # define PATH_MAX 1024
      34  #endif
      35  
      36  int
      37  do_test (void)
      38  {
      39    char *base = support_create_and_chdir_toolong_temp_directory (BASENAME);
      40  
      41    char buf[PATH_MAX + 1];
      42    const char *res = realpath (".", buf);
      43  
      44    /* canonicalize.c states that if the real path is >= PATH_MAX, then
      45       realpath returns NULL and sets ENAMETOOLONG.  */
      46    TEST_VERIFY (res == NULL);
      47    TEST_VERIFY (errno == ENAMETOOLONG);
      48  
      49    free (base);
      50    return 0;
      51  }
      52  
      53  #include <support/test-driver.c>