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 #if defined (__osf__) && (defined (__mips) || defined (mips) || defined(__alpha))
  41 #include <sys/time.h>
  42 #include <sys/resource.h>
  43 #endif
  44
  45 #ifdef __bsdi__
  46 #define BSD4_2
  47 #endif
  48
  49 #ifdef CYGWIN
  50 #define BSD4_2
  51 #endif
  52
  53 #ifndef BSD4_2
  54 #ifndef USG
  55 #ifndef MSDOS
  56 #ifndef WINDOWSNT
  57 #include <sys/vlimit.h>
  58 #endif /* not WINDOWSNT */
  59 #endif /* not MSDOS */
  60 #endif /* not USG */
  61 #else /* if BSD4_2 */
  62 #include <sys/time.h>
  63 #include <sys/resource.h>
  64 #endif /* BSD4_2 */
  65
  66 #ifdef emacs
  67 /* The important properties of this type are that 1) it's a pointer, and
  68    2) arithmetic on it should work as if the size of the object pointed
  69    to has a size of 1.  */
  70 typedef POINTER_TYPE *POINTER;
  71
  72 typedef unsigned long SIZE;
  73
  74 #ifdef NULL
  75 #undef NULL
  76 #endif
  77 #define NULL ((POINTER) 0)
  78
  79 extern POINTER start_of_data ();
  80 #ifdef DATA_SEG_BITS
  81 #define EXCEEDS_LISP_PTR(ptr) \
  82   (((EMACS_UINT) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
  83 #else
  84 #define EXCEEDS_LISP_PTR(ptr) ((EMACS_UINT) (ptr) >> VALBITS)
  85 #endif
  86
  87 #ifdef DATA_START
  88 #define start_of_data() ((char *)DATA_START)
  89 #endif
  90
  91 #ifdef BSD_SYSTEM
  92 #ifndef DATA_SEG_BITS
  93 #ifndef DATA_START
  94 extern char etext;
  95 #define start_of_data() &etext
  96 #endif
  97 #endif
  98 #endif
  99
 100 #else  /* not emacs */
 101 extern char etext;
 102 #define start_of_data() &etext
 103 #endif /* not emacs */
 104
 105 #endif /* not _LIBC */
 106
 107
 108 /* start of data space; can be changed by calling malloc_init */
 109 static POINTER data_space_start;
 110
 111 /* Number of bytes of writable memory we can expect to be able to get */
 112 static unsigned long lim_data;
 113
 114 #ifdef NO_LIM_DATA
 115 static void
 116 get_lim_data ()
 117 {
 118   lim_data = -1;
 119 }
 120 #else /* not NO_LIM_DATA */
 121
 122 #ifdef USG
 123
 124 static void
 125 get_lim_data ()
 126 {
 127   extern long ulimit ();
 128
 129   lim_data = -1;
 130
 131   /* Use the ulimit call, if we seem to have it.  */
 132 #if !defined (ULIMIT_BREAK_VALUE) || defined (GNU_LINUX)
 133   lim_data = ulimit (3, 0);
 134 #endif
 135
 136   /* If that didn't work, just use the macro's value.  */
 137 #ifdef ULIMIT_BREAK_VALUE
 138   if (lim_data == -1)
 139     lim_data = ULIMIT_BREAK_VALUE;
 140 #endif
 141
 142   lim_data -= (long) data_space_start;
 143 }
 144
 145 #else /* not USG */
 146 #ifdef WINDOWSNT
 147
 148 static void
 149 get_lim_data ()
 150 {
 151   extern unsigned long reserved_heap_size;
 152   lim_data = reserved_heap_size;
 153 }
 154
 155 #else
 156 #if !defined (BSD4_2) && !defined (__osf__)
 157
 158 #ifdef MSDOS
 159 void
 160 get_lim_data ()
 161 {
 162   _go32_dpmi_meminfo info;
 163
 164   _go32_dpmi_get_free_memory_information (&info);
 165   lim_data = info.available_memory;
 166 }
 167 #else /* not MSDOS */
 168 static void
 169 get_lim_data ()
 170 {
 171   lim_data = vlimit (LIM_DATA, -1);
 172 }
 173 #endif /* not MSDOS */
 174
 175 #else /* BSD4_2 */
 176
 177 static void
 178 get_lim_data ()
 179 {
 180   struct rlimit XXrlimit;
 181
 182   getrlimit (RLIMIT_DATA, &XXrlimit);
 183 #ifdef RLIM_INFINITY
 184   lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
 185 #else
 186   lim_data = XXrlimit.rlim_cur; /* soft limit */
 187 #endif
 188 }
 189 #endif /* BSD4_2 */
 190 #endif /* not WINDOWSNT */
 191 #endif /* not USG */
 192 #endif /* not NO_LIM_DATA */