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