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