code.delx.au - gnu-emacs/blob - src/mem-limits.h

   1 /* Includes for memory limit warnings.
   2    Copyright (C) 1990, 1993, 1994, 1995 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #ifdef MSDOS
  21 #include <dpmi.h>
  22 #endif
  23
  24 /* Some systems need this before <sys/resource.h>.  */
  25 #include <sys/types.h>
  26
  27 #ifdef _LIBC
  28
  29 #include <sys/resource.h>
  30 #define BSD4_2                  /* Tell code below to use getrlimit.  */
  31
  32 extern int __data_start;
  33 #define start_of_data() &__data_start
  34
  35 #else
  36
  37 #if defined (__osf__) && (defined (__mips) || defined (mips) || defined(__alpha))
  38 #include <sys/time.h>
  39 #include <sys/resource.h>
  40 #endif
  41
  42 #ifdef __bsdi__
  43 #define BSD4_2
  44 #endif
  45
  46 #ifndef BSD4_2
  47 #ifndef USG
  48 #ifndef MSDOS
  49 #ifndef WINDOWSNT
  50 #include <sys/vlimit.h>
  51 #endif /* not WINDOWSNT */
  52 #endif /* not MSDOS */
  53 #endif /* not USG */
  54 #else /* if BSD4_2 */
  55 #include <sys/time.h>
  56 #include <sys/resource.h>
  57 #endif /* BSD4_2 */
  58
  59 #ifdef emacs
  60 /* The important properties of this type are that 1) it's a pointer, and
  61    2) arithmetic on it should work as if the size of the object pointed
  62    to has a size of 1.  */
  63 #ifdef __STDC__
  64 typedef void *POINTER;
  65 #else
  66 typedef char *POINTER;
  67 #endif
  68
  69 typedef unsigned long SIZE;
  70
  71 #ifdef NULL
  72 #undef NULL
  73 #endif
  74 #define NULL ((POINTER) 0)
  75
  76 extern POINTER start_of_data ();
  77 #ifdef DATA_SEG_BITS
  78 #define EXCEEDS_LISP_PTR(ptr) \
  79   (((EMACS_UINT) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
  80 #else
  81 #define EXCEEDS_LISP_PTR(ptr) ((EMACS_UINT) (ptr) >> VALBITS)
  82 #endif
  83
  84 #ifdef BSD
  85 #ifndef DATA_SEG_BITS
  86 extern char etext;
  87 #define start_of_data() &etext
  88 #endif
  89 #endif
  90
  91 #else  /* Not emacs */
  92 extern char etext;
  93 #define start_of_data() &etext
  94 #endif /* Not emacs */
  95
  96 #endif /* _LIBC */
  97
  98
  99 /* start of data space; can be changed by calling malloc_init */
 100 static POINTER data_space_start;
 101
 102 /* Number of bytes of writable memory we can expect to be able to get */
 103 static unsigned int lim_data;
 104
 105 #ifdef NO_LIM_DATA
 106 static void
 107 get_lim_data ()
 108 {
 109   lim_data = -1;
 110 }
 111 #else /* not NO_LIM_DATA */
 112
 113 #ifdef USG
 114
 115 static void
 116 get_lim_data ()
 117 {
 118   extern long ulimit ();
 119
 120   lim_data = -1;
 121
 122   /* Use the ulimit call, if we seem to have it.  */
 123 #if !defined (ULIMIT_BREAK_VALUE) || defined (LINUX)
 124   lim_data = ulimit (3, 0);
 125 #endif
 126
 127   /* If that didn't work, just use the macro's value.  */
 128 #ifdef ULIMIT_BREAK_VALUE
 129   if (lim_data == -1)
 130     lim_data = ULIMIT_BREAK_VALUE;
 131 #endif
 132
 133   lim_data -= (long) data_space_start;
 134 }
 135
 136 #else /* not USG */
 137 #ifdef WINDOWSNT
 138
 139 static void
 140 get_lim_data ()
 141 {
 142   extern unsigned long data_region_size;
 143   lim_data = data_region_size;
 144 }
 145
 146 #else
 147 #if !defined (BSD4_2) && !defined (__osf__)
 148
 149 #ifdef MSDOS
 150 void
 151 get_lim_data ()
 152 {
 153   _go32_dpmi_meminfo info;
 154
 155   _go32_dpmi_get_free_memory_information (&info);
 156   lim_data = info.available_memory;
 157 }
 158 #else /* not MSDOS */
 159 static void
 160 get_lim_data ()
 161 {
 162   lim_data = vlimit (LIM_DATA, -1);
 163 }
 164 #endif /* not MSDOS */
 165
 166 #else /* BSD4_2 */
 167
 168 static void
 169 get_lim_data ()
 170 {
 171   struct rlimit XXrlimit;
 172
 173   getrlimit (RLIMIT_DATA, &XXrlimit);
 174 #ifdef RLIM_INFINITY
 175   lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
 176 #else
 177   lim_data = XXrlimit.rlim_cur; /* soft limit */
 178 #endif
 179 }
 180 #endif /* BSD4_2 */
 181 #endif /* not WINDOWSNT */
 182 #endif /* not USG */
 183 #endif /* not NO_LIM_DATA */