sysdeps/posix/mk-stdiolim.c

   1 /* Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <posix1_lim.h>
  20
  21 int
  22 main()
  23 {
  24   /* These values correspond to the code in sysdeps/posix/tempname.c.
  25      Change the values here if you change that code.  */
  26   printf("#define L_tmpnam %u\n", sizeof("/usr/tmp/") + 8);
  27   printf("#define TMP_MAX %u\n", 62 * 62 * 62);
  28
  29   puts  ("#ifdef __USE_POSIX");
  30   printf("#define L_ctermid %u\n", sizeof("/dev/tty"));
  31   printf("#define L_cuserid 9\n");
  32   puts  ("#endif");
  33
  34   /* POSIX does not require that OPEN_MAX and PATH_MAX be defined, so
  35      <local_lim.h> will not define them if they are run-time variant (which
  36      is the case in the Hurd).  ANSI still requires that FOPEN_MAX and
  37      FILENAME_MAX be defined, however.  */
  38
  39   printf("#define FOPEN_MAX %u\n",
  40 #ifdef  OPEN_MAX
  41
  42          OPEN_MAX
  43 #else
  44          /* This is the minimum number of files that the implementation
  45             guarantees can be open simultaneously.  OPEN_MAX not being
  46             defined means the maximum is run-time variant; but POSIX.1
  47             requires that it never be less than _POSIX_OPEN_MAX, so that is
  48             a good minimum to use.  */
  49          _POSIX_OPEN_MAX
  50 #endif
  51
  52          );
  53
  54   printf("#define FILENAME_MAX %u\n",
  55 #ifdef  PATH_MAX
  56          PATH_MAX
  57 #else
  58          /* This is supposed to be the size needed to hold the longest file
  59             name string the implementation guarantees can be opened.
  60             PATH_MAX not being defined means the actual limit on the length
  61             of a file name is runtime-variant (or it is unlimited).  ANSI
  62             says in such a case FILENAME_MAX should be a good size to
  63             allocate for a file name string.  POSIX.1 guarantees that a
  64             file name up to _POSIX_PATH_MAX chars long can be opened, so
  65             this value must be at least that.  */
  66             1024                /* _POSIX_PATH_MAX is 255.  */
  67 #endif
  68          );
  69
  70   exit(0);
  71 }