X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=m4%2Fgetcwd-abort-bug.m4;fp=m4%2Fgetcwd-abort-bug.m4;h=59c3daaa52ba3134c9907a60be2abb5d389aed83;hb=a2016c1de6e4884f6c8ed5cc498f3bf821c25ca4;hp=0000000000000000000000000000000000000000;hpb=c7e61475680fa226bd9b8bdd469cd66914e630f5;p=debian%2Fgzip

diff --git a/m4/getcwd-abort-bug.m4 b/m4/getcwd-abort-bug.m4
new file mode 100644
index 0000000..59c3daa
--- /dev/null
+++ b/m4/getcwd-abort-bug.m4
@@ -0,0 +1,106 @@
+# serial 2
+# Determine whether getcwd aborts when the length of the working directory
+# name is unusually large.  Any length between 4k and 16k trigger the bug
+# when using glibc-2.4.90-9 or older.
+
+# Copyright (C) 2006, 2009, 2010 Free Software Foundation, Inc.
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# From Jim Meyering
+
+# gl_FUNC_GETCWD_ABORT_BUG([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+AC_DEFUN([gl_FUNC_GETCWD_ABORT_BUG],
+[
+  AC_CHECK_DECLS_ONCE([getcwd])
+  AC_CHECK_FUNCS([getpagesize])
+  AC_CACHE_CHECK([whether getcwd aborts when 4k < cwd_length < 16k],
+    gl_cv_func_getcwd_abort_bug,
+    [# Remove any remnants of a previous test.
+     rm -rf confdir-14B---
+     # Arrange for deletion of the temporary directory this test creates.
+     ac_clean_files="$ac_clean_files confdir-14B---"
+     AC_RUN_IFELSE(
+       [AC_LANG_SOURCE(
+          [[
+#include <stdlib.h>
+#include <unistd.h>
+#include <limits.h>
+#include <string.h>
+#include <sys/stat.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;
+
+  /* The bug is triggered when PATH_MAX < getpagesize (), so skip
+     this relative expensive and invasive test if that's not true.  */
+  if (getpagesize () <= PATH_MAX)
+    return 0;
+
+  cwd = getcwd (NULL, 0);
+  if (cwd == NULL)
+    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)
+        {
+          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;
+}
+          ]])],
+    [gl_cv_func_getcwd_abort_bug=no],
+    [gl_cv_func_getcwd_abort_bug=yes],
+    [gl_cv_func_getcwd_abort_bug=yes])
+  ])
+  AS_IF([test $gl_cv_func_getcwd_abort_bug = yes], [$1], [$2])
+])