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