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

   1 /* Includes for memory limit warnings.
   2    Copyright (C) 1990, 1993 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, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #ifdef MSDOS
  21 #include <dpmi.h>
  22 #endif
  23
  24 #ifdef _LIBC
  25
  26 #include <sys/resource.h>
  27 #define BSD4_2                  /* Tell code below to use getrlimit.  */
  28
  29 #else
  30
  31 #if defined (__osf__) && (defined (__mips) || defined (mips))
  32 #include <sys/time.h>
  33 #include <sys/resource.h>
  34 #endif
  35
  36 #ifdef __bsdi__
  37 #define BSD4_2
  38 #endif
  39
  40 #ifndef BSD4_2
  41 #ifndef USG
  42 #ifndef MSDOS
  43 #include <sys/vlimit.h>
  44 #endif /* not MSDOS */
  45 #endif /* not USG */
  46 #else /* if BSD4_2 */
  47 #include <sys/time.h>
  48 #include <sys/resource.h>
  49 #endif /* BSD4_2 */
  50
  51 #endif /* _LIBC */
  52
  53 #ifdef emacs
  54 /* The important properties of this type are that 1) it's a pointer, and
  55    2) arithmetic on it should work as if the size of the object pointed
  56    to has a size of 1.  */
  57 #ifdef __STDC__
  58 typedef void *POINTER;
  59 #else
  60 typedef char *POINTER;
  61 #endif
  62
  63 typedef unsigned long SIZE;
  64
  65 #ifdef NULL
  66 #undef NULL
  67 #endif
  68 #define NULL ((POINTER) 0)
  69
  70 extern POINTER start_of_data ();
  71 #ifdef DATA_SEG_BITS
  72 #define EXCEEDS_LISP_PTR(ptr) \
  73   (((unsigned int) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
  74 #else
  75 #define EXCEEDS_LISP_PTR(ptr) ((unsigned int) (ptr) >> VALBITS)
  76 #endif
  77
  78 #ifdef BSD
  79 #ifndef DATA_SEG_BITS
  80 extern char etext;
  81 #define start_of_data() &etext
  82 #endif
  83 #endif
  84
  85 #else  /* Not emacs */
  86 extern char etext;
  87 #define start_of_data() &etext
  88 #endif /* Not emacs */
  89
  90
  91
  92 /* start of data space; can be changed by calling malloc_init */
  93 static POINTER data_space_start;
  94
  95 /* Number of bytes of writable memory we can expect to be able to get */
  96 static unsigned int lim_data;
  97
  98 #ifdef USG
  99
 100 static void
 101 get_lim_data ()
 102 {
 103   extern long ulimit ();
 104
 105   lim_data = -1;
 106
 107   /* Use the ulimit call, if we seem to have it.  */
 108 #if !defined (ULIMIT_BREAK_VALUE) || defined (LINUX)
 109   lim_data = ulimit (3, 0);
 110 #endif
 111
 112   /* If that didn't work, just use the macro's value.  */
 113 #ifdef ULIMIT_BREAK_VALUE
 114   if (lim_data == -1)
 115     lim_data = ULIMIT_BREAK_VALUE;
 116 #endif
 117
 118   lim_data -= (long) data_space_start;
 119 }
 120
 121 #else /* not USG */
 122 #if !defined (BSD4_2) && !defined (__osf__)
 123
 124 #ifdef MSDOS
 125 void
 126 get_lim_data ()
 127 {
 128   _go32_dpmi_meminfo info;
 129
 130   _go32_dpmi_get_free_memory_information (&info);
 131   lim_data = info.available_memory;
 132 }
 133 #else /* not MSDOS */
 134 static void
 135 get_lim_data ()
 136 {
 137   lim_data = vlimit (LIM_DATA, -1);
 138 }
 139 #endif /* not MSDOS */
 140
 141 #else /* BSD4_2 */
 142
 143 static void
 144 get_lim_data ()
 145 {
 146   struct rlimit XXrlimit;
 147
 148   getrlimit (RLIMIT_DATA, &XXrlimit);
 149 #ifdef RLIM_INFINITY
 150   lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
 151 #else
 152   lim_data = XXrlimit.rlim_cur; /* soft limit */
 153 #endif
 154 }
 155 #endif /* BSD4_2 */
 156 #endif /* not USG */