1  /* Minimum guaranteed maximum values for system limits.  Hurd version.
       2     Copyright (C) 1993-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* GNU has no arbitrary fixed limits on most of these things, so we
      20     don't define the macros.  Some things are unlimited.  Some are in
      21     fact limited but the limit is run-time dependent and fetched with
      22     `sysconf' or `pathconf'.  */
      23  
      24  /* This one value is actually constrained by the `struct dirent'
      25     layout, in which the `d_namlen' member is only 8 bits wide.  */
      26  
      27  #define NAME_MAX	255
      28  
      29  /* POSIX.1 requires that we define NGROUPS_MAX (though none of the others
      30     is required).  GNU allows any number of supplementary groups,
      31     dynamically allocated.  So we pick a number which seems vaguely
      32     suitable, and `sysconf' will return a number at least as large.  */
      33  
      34  #define NGROUPS_MAX	256
      35  
      36  /* The number of data keys per process.  */
      37  #define _POSIX_THREAD_KEYS_MAX	128
      38  
      39  /* Controlling the iterations of destructors for thread-specific data.  */
      40  #define _POSIX_THREAD_DESTRUCTOR_ITERATIONS	4
      41  
      42  /* The number of threads per process.  */
      43  #define _POSIX_THREAD_THREADS_MAX	64
      44  
      45  /* Maximum value the semaphore can have.  */
      46  #define SEM_VALUE_MAX   (2147483647)