src/mem-limits.h

   1 /* Includes for memory limit warnings.
   2    Copyright (C) 1990, 1993, 1994 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 /* Some systems need this before <sys/resource.h>.  */
  25 #include <sys/types.h>
  26
  27 #ifdef _LIBC
  28
  29 #include <sys/resource.h>
  30 #define BSD4_2                  /* Tell code below to use getrlimit.  */
  31
  32 #else
  33
  34 #if defined (__osf__) && (defined (__mips) || defined (mips))
  35 #include <sys/time.h>
  36 #include <sys/resource.h>
  37 #endif
  38
  39 #ifdef __bsdi__
  40 #define BSD4_2
  41 #endif
  42
  43 #ifndef BSD4_2
  44 #ifndef USG
  45 #ifndef MSDOS
  46 #include <sys/vlimit.h>
  47 #endif /* not MSDOS */
  48 #endif /* not USG */
  49 #else /* if BSD4_2 */
  50 #include <sys/time.h>
  51 #include <sys/resource.h>
  52 #endif /* BSD4_2 */
  53
  54 #endif /* _LIBC */
  55
  56 #ifdef emacs
  57 /* The important properties of this type are that 1) it's a pointer, and
  58    2) arithmetic on it should work as if the size of the object pointed
  59    to has a size of 1.  */
  60 #ifdef __STDC__
  61 typedef void *POINTER;
  62 #else
  63 typedef char *POINTER;
  64 #endif
  65
  66 typedef unsigned long SIZE;
  67
  68 #ifdef NULL
  69 #undef NULL
  70 #endif
  71 #define NULL ((POINTER) 0)
  72
  73 extern POINTER start_of_data ();
  74 #ifdef DATA_SEG_BITS
  75 #define EXCEEDS_LISP_PTR(ptr) \
  76   (((unsigned int) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
  77 #else
  78 #define EXCEEDS_LISP_PTR(ptr) ((unsigned int) (ptr) >> VALBITS)
  79 #endif
  80
  81 #ifdef BSD
  82 #ifndef DATA_SEG_BITS
  83 extern char etext;
  84 #define start_of_data() &etext
  85 #endif
  86 #endif
  87
  88 #else  /* Not emacs */
  89 extern char etext;
  90 #define start_of_data() &etext
  91 #endif /* Not emacs */
  92
  93
  94
  95 /* start of data space; can be changed by calling malloc_init */
  96 static POINTER data_space_start;
  97
  98 /* Number of bytes of writable memory we can expect to be able to get */
  99 static unsigned int lim_data;
 100
 101 #ifdef USG
 102
 103 static void
 104 get_lim_data ()
 105 {
 106   extern long ulimit ();
 107
 108   lim_data = -1;
 109
 110   /* Use the ulimit call, if we seem to have it.  */
 111 #if !defined (ULIMIT_BREAK_VALUE) || defined (LINUX)
 112   lim_data = ulimit (3, 0);
 113 #endif
 114
 115   /* If that didn't work, just use the macro's value.  */
 116 #ifdef ULIMIT_BREAK_VALUE
 117   if (lim_data == -1)
 118     lim_data = ULIMIT_BREAK_VALUE;
 119 #endif
 120
 121   lim_data -= (long) data_space_start;
 122 }
 123
 124 #else /* not USG */
 125 #if !defined (BSD4_2) && !defined (__osf__)
 126
 127 #ifdef MSDOS
 128 void
 129 get_lim_data ()
 130 {
 131   _go32_dpmi_meminfo info;
 132
 133   _go32_dpmi_get_free_memory_information (&info);
 134   lim_data = info.available_memory;
 135 }
 136 #else /* not MSDOS */
 137 static void
 138 get_lim_data ()
 139 {
 140   lim_data = vlimit (LIM_DATA, -1);
 141 }
 142 #endif /* not MSDOS */
 143
 144 #else /* BSD4_2 */
 145
 146 static void
 147 get_lim_data ()
 148 {
 149   struct rlimit XXrlimit;
 150
 151   getrlimit (RLIMIT_DATA, &XXrlimit);
 152 #ifdef RLIM_INFINITY
 153   lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
 154 #else
 155   lim_data = XXrlimit.rlim_cur; /* soft limit */
 156 #endif
 157 }
 158 #endif /* BSD4_2 */
 159 #endif /* not USG */