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

   1 /* Includes for memory limit warnings.
   2    Copyright (C) 1990, 1992 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 1, 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 #ifndef BSD4_2
  21 #ifndef USG
  22 #include <sys/vlimit.h>
  23 #endif /* not USG */
  24 #else /* if BSD4_2 */
  25 #include <sys/time.h>
  26 #include <sys/resource.h>
  27 #endif /* BSD4_2 */
  28
  29 /* The important properties of this type are that 1) it's a pointer, and
  30    2) arithmetic on it should work as if the size of the object pointed
  31    to has a size of 1.  */
  32 #ifdef __STDC__
  33 typedef void *POINTER;
  34 #else
  35 typedef char *POINTER;
  36 #endif
  37
  38 typedef unsigned long SIZE;
  39
  40 #ifdef NULL
  41 #undef NULL
  42 #endif
  43 #define NULL ((POINTER) 0)
  44
  45 #ifdef emacs
  46 extern POINTER start_of_data ();
  47 #define EXCEEDS_ELISP_PTR(ptr) ((unsigned int) (ptr) >> VALBITS)
  48
  49 #ifdef BSD
  50 #ifndef DATA_SEG_BITS
  51 extern char etext;
  52 #define start_of_data() &etext
  53 #endif
  54 #endif
  55
  56 #else  /* Not emacs */
  57 extern char etext;
  58 #define start_of_data() &etext
  59 #endif /* Not emacs */
  60
  61
  62
  63 /* start of data space; can be changed by calling malloc_init */
  64 static POINTER data_space_start;
  65
  66 /* Number of bytes of writable memory we can expect to be able to get */
  67 static unsigned int lim_data;
  68
  69
  70
  71 #ifdef USG
  72
  73 get_lim_data ()
  74 {
  75   extern long ulimit ();
  76
  77 #ifdef ULIMIT_BREAK_VALUE
  78   lim_data = ULIMIT_BREAK_VALUE;
  79 #else
  80   lim_data = ulimit (3, 0);
  81 #endif
  82
  83   lim_data -= (long) data_space_start;
  84 }
  85
  86 #else /* not USG */
  87 #ifndef BSD4_2
  88
  89 get_lim_data ()
  90 {
  91   lim_data = vlimit (LIM_DATA, -1);
  92 }
  93
  94 #else /* BSD4_2 */
  95
  96 get_lim_data ()
  97 {
  98   struct rlimit XXrlimit;
  99
 100   getrlimit (RLIMIT_DATA, &XXrlimit);
 101 #ifdef RLIM_INFINITY
 102   lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
 103 #else
 104   lim_data = XXrlimit.rlim_cur; /* soft limit */
 105 #endif
 106 }
 107 #endif /* BSD4_2 */
 108 #endif /* not USG */