gistfile1.txt

#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <string.h>
#include <sys/stat.h>
#include <stdio.h>

/* Don't get link errors because mkdir is redefined to rpl_mkdir.  */
#undef mkdir

#ifndef S_IRWXU
# define S_IRWXU 0700
#endif

/* FIXME: skip the run-test altogether on systems without getpagesize.  */
#if ! HAVE_GETPAGESIZE
# define getpagesize() 0
#endif

/* This size is chosen to be larger than PATH_MAX (4k), yet smaller than
   the 16kB pagesize on ia64 linux.  Those conditions make the code below
   trigger a bug in glibc's getcwd implementation before 2.4.90-10.  */
#define TARGET_LEN (5 * 1024)

int
main ()
{
  char const *dir_name = "confdir-14B---";
  char *cwd;
  size_t initial_cwd_len;
  int fail = 0;
  size_t desired_depth;
  size_t d;

  printf("Test");

  /* The bug is triggered when PATH_MAX < getpagesize (), so skip
     this relative expensive and invasive test if that's not true.  */
#if 0
  XXX - This section exits early when run on its own, but from within configure
        the condition is not met and the 'infinite' subdirectories are created.

  if (getpagesize () <= PATH_MAX) {
    printf ("getpagesize() <= PATH_MAX\n");
    return 0;
  }
#endif

  cwd = getcwd (NULL, 0);
  if (cwd == NULL) {
    printf ("cmd == NULL\n");
    return 0;
  }

  initial_cwd_len = strlen (cwd);
  free (cwd);
  desired_depth = ((TARGET_LEN - 1 - initial_cwd_len)
                   / (1 + strlen (dir_name)));
  for (d = 0; d < desired_depth; d++)
    {
      if (mkdir (dir_name, S_IRWXU) < 0 || chdir (dir_name) < 0)
        {
          printf ("Unable to construct deep hierarchy, fail 3\n");
          fail = 3; /* Unable to construct deep hierarchy.  */
          break;
        }
    }

  /* If libc has the bug in question, this invocation of getcwd
     results in a failed assertion.  */
  cwd = getcwd (NULL, 0);
  if (cwd == NULL)
    fail = 4; /* getcwd failed.  This is ok, and expected.  */
  free (cwd);

  /* Call rmdir first, in case the above chdir failed.  */
  rmdir (dir_name);
  while (0 < d--)
    {
      if (chdir ("..") < 0)
        break;
      rmdir (dir_name);
    }

  return 0;
}