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

   1 /* Includes for memory limit warnings.
   2    Copyright (C) 1990, 1993, 1994, 1995, 1996 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, Inc., 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21 #ifdef MSDOS
  22 #include <dpmi.h>
  23 extern int etext;
  24 #endif
  25
  26 /* Some systems need this before <sys/resource.h>.  */
  27 #include <sys/types.h>
  28
  29 #ifdef _LIBC
  30
  31 #include <sys/resource.h>
  32 #define BSD4_2                  /* Tell code below to use getrlimit.  */
  33
  34 /* Old Linux startup code won't define __data_start.  */
  35 extern int etext, __data_start; weak_extern (__data_start)
  36 #define start_of_data() (&__data_start ?: &etext)
  37
  38 #else /* not _LIBC */
  39
  40 #ifdef HAVE_SYS_RESOURCE_H
  41 # include <sys/time.h>
  42 # include <sys/resource.h>
  43 #else
  44 # if HAVE_SYS_VLIMIT_H
  45 #  include <sys/vlimit.h>       /* Obsolete, says glibc */
  46 # endif
  47 #endif
  48
  49 #ifdef __bsdi__
  50 #define BSD4_2
  51 #endif
  52
  53 #ifdef CYGWIN
  54 #define BSD4_2
  55 #endif
  56
  57 #ifndef BSD4_2
  58 #ifndef USG
  59 #ifndef MSDOS
  60 #ifndef WINDOWSNT
  61 #include <sys/vlimit.h>
  62 #endif /* not WINDOWSNT */
  63 #endif /* not MSDOS */
  64 #endif /* not USG */
  65 #else /* if BSD4_2 */
  66 #include <sys/time.h>
  67 #include <sys/resource.h>
  68 #endif /* BSD4_2 */
  69
  70 #ifdef emacs
  71 /* The important properties of this type are that 1) it's a pointer, and
  72    2) arithmetic on it should work as if the size of the object pointed
  73    to has a size of 1.  */
  74 typedef POINTER_TYPE *POINTER;
  75
  76 typedef unsigned long SIZE;
  77
  78 #ifdef NULL
  79 #undef NULL
  80 #endif
  81 #define NULL ((POINTER) 0)
  82
  83 extern POINTER start_of_data ();
  84 #ifdef DATA_SEG_BITS
  85 #define EXCEEDS_LISP_PTR(ptr) \
  86   (((EMACS_UINT) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
  87 #else
  88 #define EXCEEDS_LISP_PTR(ptr) ((EMACS_UINT) (ptr) >> VALBITS)
  89 #endif
  90
  91 #ifdef DATA_START
  92 #define start_of_data() ((char *)DATA_START)
  93 #endif
  94
  95 #ifdef BSD_SYSTEM
  96 #ifndef DATA_SEG_BITS
  97 #ifndef DATA_START
  98 extern char etext;
  99 #define start_of_data() &etext
 100 #endif
 101 #endif
 102 #endif
 103
 104 #else  /* not emacs */
 105 extern char etext;
 106 #define start_of_data() &etext
 107 #endif /* not emacs */
 108
 109 #endif /* not _LIBC */
 110
 111
 112 /* start of data space; can be changed by calling malloc_init */
 113 static POINTER data_space_start;
 114
 115 /* Number of bytes of writable memory we can expect to be able to get */
 116 static unsigned long lim_data;
 117
 118 #ifdef NO_LIM_DATA
 119 static void
 120 get_lim_data ()
 121 {
 122   lim_data = -1;
 123 }
 124 #else /* not NO_LIM_DATA */
 125
 126 #ifdef USG
 127
 128 static void
 129 get_lim_data ()
 130 {
 131   extern long ulimit ();
 132
 133   lim_data = -1;
 134
 135   /* Use the ulimit call, if we seem to have it.  */
 136 #if !defined (ULIMIT_BREAK_VALUE) || defined (GNU_LINUX)
 137   lim_data = ulimit (3, 0);
 138 #endif
 139
 140   /* If that didn't work, just use the macro's value.  */
 141 #ifdef ULIMIT_BREAK_VALUE
 142   if (lim_data == -1)
 143     lim_data = ULIMIT_BREAK_VALUE;
 144 #endif
 145
 146   lim_data -= (long) data_space_start;
 147 }
 148
 149 #else /* not USG */
 150 #ifdef WINDOWSNT
 151
 152 static void
 153 get_lim_data ()
 154 {
 155   extern unsigned long reserved_heap_size;
 156   lim_data = reserved_heap_size;
 157 }
 158
 159 #else
 160 #if !defined (BSD4_2) && !defined (__osf__)
 161
 162 #ifdef MSDOS
 163 void
 164 get_lim_data ()
 165 {
 166   _go32_dpmi_meminfo info;
 167
 168   _go32_dpmi_get_free_memory_information (&info);
 169   lim_data = info.available_memory;
 170 }
 171 #else /* not MSDOS */
 172 static void
 173 get_lim_data ()
 174 {
 175   lim_data = vlimit (LIM_DATA, -1);
 176 }
 177 #endif /* not MSDOS */
 178
 179 #else /* BSD4_2 */
 180
 181 static void
 182 get_lim_data ()
 183 {
 184   struct rlimit XXrlimit;
 185
 186   getrlimit (RLIMIT_DATA, &XXrlimit);
 187 #ifdef RLIM_INFINITY
 188   lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
 189 #else
 190   lim_data = XXrlimit.rlim_cur; /* soft limit */
 191 #endif
 192 }
 193 #endif /* BSD4_2 */
 194 #endif /* not WINDOWSNT */
 195 #endif /* not USG */
 196 #endif /* not NO_LIM_DATA */
 197
 198 /* arch-tag: fe39244e-e54f-4208-b7aa-02556f7841c5
 199    (do not change this comment) */