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-rw-r--r--sysdeps/generic/eloop-threshold.h72
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diff --git a/sysdeps/generic/eloop-threshold.h b/sysdeps/generic/eloop-threshold.h
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-/* Threshold at which to diagnose ELOOP.  Generic version.
-   Copyright (C) 2012-2017 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <http://www.gnu.org/licenses/>.  */
-
-#ifndef _ELOOP_THRESHOLD_H
-#define _ELOOP_THRESHOLD_H      1
-
-#include <limits.h>
-#include <sys/param.h>
-
-/* POSIX specifies SYMLOOP_MAX as the "Maximum number of symbolic
-   links that can be reliably traversed in the resolution of a
-   pathname in the absence of a loop."  This makes it a minimum that
-   we should certainly accept.  But it leaves open the possibility
-   that more might sometimes work--just not "reliably".
-
-   For example, Linux implements a complex policy whereby there is a
-   small limit on the number of direct symlink traversals (a symlink
-   to a symlink to a symlink), but larger limit on the total number of
-   symlink traversals overall.  Hence the SYMLOOP_MAX number should be
-   the small one, but the limit library functions enforce on users
-   should be the larger one.
-
-   So, we use the larger of the reported SYMLOOP_MAX (if any) and our
-   own constant MIN_ELOOP_THRESHOLD, below.  This constant should be
-   large enough that it never rules out a file name and directory tree
-   that the underlying system (i.e. calls to 'open' et al) would
-   resolve successfully.  It should be small enough that actual loops
-   are detected without a huge number of iterations.  */
-
-#ifndef MIN_ELOOP_THRESHOLD
-# define MIN_ELOOP_THRESHOLD    40
-#endif
-
-/* Return the maximum number of symlink traversals to permit
-   before diagnosing ELOOP.  */
-static inline unsigned int __attribute__ ((const))
-__eloop_threshold (void)
-{
-#ifdef SYMLOOP_MAX
-  const int symloop_max = SYMLOOP_MAX;
-#else
-  /* The function is marked 'const' even though we use memory and
-     call a function, because sysconf is required to return the
-     same value in every call and so it must always be safe to
-     call __eloop_threshold exactly once and reuse the value.  */
-  static long int sysconf_symloop_max;
-  if (sysconf_symloop_max == 0)
-    sysconf_symloop_max = __sysconf (_SC_SYMLOOP_MAX);
-  const unsigned int symloop_max = (sysconf_symloop_max <= 0
-                                    ? _POSIX_SYMLOOP_MAX
-                                    : sysconf_symloop_max);
-#endif
-
-  return MAX (symloop_max, MIN_ELOOP_THRESHOLD);
-}
-
-#endif  /* eloop-threshold.h */