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