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