sysdeps/unix/sysv/linux/bits/local_lim.h

   1 /* Minimum guaranteed maximum values for system limits.  Linux version.
   2    Copyright (C) 1993-1998,2000,2003,2004,2008 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    <http://www.gnu.org/licenses/>.  */
  18
  19 /* The kernel header pollutes the namespace with the NR_OPEN symbol
  20    and defines LINK_MAX although filesystems have different maxima.  A
  21    similar thing is true for OPEN_MAX: the limit can be changed at
  22    runtime and therefore the macro must not be defined.  Remove this
  23    after including the header if necessary.  */
  24 #ifndef NR_OPEN
  25 # define __undef_NR_OPEN
  26 #endif
  27 #ifndef LINK_MAX
  28 # define __undef_LINK_MAX
  29 #endif
  30 #ifndef OPEN_MAX
  31 # define __undef_OPEN_MAX
  32 #endif
  33 #ifndef ARG_MAX
  34 # define __undef_ARG_MAX
  35 #endif
  36
  37 /* The kernel sources contain a file with all the needed information.  */
  38 #include <linux/limits.h>
  39
  40 /* Have to remove NR_OPEN?  */
  41 #ifdef __undef_NR_OPEN
  42 # undef NR_OPEN
  43 # undef __undef_NR_OPEN
  44 #endif
  45 /* Have to remove LINK_MAX?  */
  46 #ifdef __undef_LINK_MAX
  47 # undef LINK_MAX
  48 # undef __undef_LINK_MAX
  49 #endif
  50 /* Have to remove OPEN_MAX?  */
  51 #ifdef __undef_OPEN_MAX
  52 # undef OPEN_MAX
  53 # undef __undef_OPEN_MAX
  54 #endif
  55 /* Have to remove ARG_MAX?  */
  56 #ifdef __undef_ARG_MAX
  57 # undef ARG_MAX
  58 # undef __undef_ARG_MAX
  59 #endif
  60
  61 /* Maximum amount by which a process can descrease its asynchronous I/O
  62    priority level.  */
  63 #define AIO_PRIO_DELTA_MAX      20
  64
  65 /* Maximum tty name length.  */
  66 #define TTY_NAME_MAX            32
  67
  68 /* Maximum login name length.  This is arbitrary.  */
  69 #define LOGIN_NAME_MAX          256
  70
  71 /* Maximum host name length.  */
  72 #define HOST_NAME_MAX           64
  73
  74 /* Maximum message queue priority level.  */
  75 #define MQ_PRIO_MAX             32768