glibc/sysdeps/mach/hurd/bits/local_lim.h

/* Minimum guaranteed maximum values for system limits.  Hurd version.
   Copyright (C) 1993, 94, 96, 98 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

/* GNU has no arbitrary fixed limits on these things, so we don't
   define the macros.  Some things are unlimited.  Some are in fact
   limited but the limit is run-time dependent and fetched with
   `sysconf' or `pathconf'.

   POSIX.1 requires that we define NGROUPS_MAX (though none of the others
   is required).  GNU allows any number of supplementary groups,
   dynamically allocated.  So we pick a number which seems vaguely
   suitable, and `sysconf' will return a number at least as large.  */

#define NGROUPS_MAX	256

/* The maximum number of symbolic links that are allowed in a single file
   name resolution.  When a further link is encountered, the call returns
   ELOOP.  This name is a GNU extension; POSIX.1 has no such limit, and BSD
   calls it MAXSYMLINKS in <sys/param.h>.  (We define the name under
   _BSD_SOURCE even without _GNU_SOURCE because our <sys/param.h> uses it
   to define MAXSYMLINKS.)  */

#if defined __USE_GNU || defined __USE_BSD /* 1003.1a defines this */
#define	SYMLOOP_MAX	8
#endif