gnu/lib/libmalloc/mem-limits.h

   1 /* Includes for memory limit warnings.
   2    Copyright (C) 1990, 1993 Free Software Foundation, Inc.
   3
   4
   5 This file is part of the GNU C Library.
   6
   7 The GNU C Library is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Library General Public License as
   9 published by the Free Software Foundation; either version 2 of the
  10 License, or (at your option) any later version.
  11
  12 The GNU C Library is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 Library General Public License for more details.
  16
  17 You should have received a copy of the GNU Library General Public
  18 License along with the GNU C Library; see the file COPYING.LIB.  If
  19 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  20 Cambridge, MA 02139, USA.  */
  21
  22 #if defined(__osf__) && (defined(__mips) || defined(mips))
  23 #include <sys/time.h>
  24 #include <sys/resource.h>
  25 #endif
  26
  27 #if defined(__bsdi__) || defined(__NetBSD__)
  28 #define BSD4_2
  29 #endif
  30
  31 #ifndef BSD4_2
  32 #ifndef USG
  33 #include <sys/vlimit.h>
  34 #endif /* not USG */
  35 #else /* if BSD4_2 */
  36 #include <sys/time.h>
  37 #include <sys/resource.h>
  38 #endif /* BSD4_2 */
  39
  40 #ifdef emacs
  41 /* The important properties of this type are that 1) it's a pointer, and
  42    2) arithmetic on it should work as if the size of the object pointed
  43    to has a size of 1.  */
  44 #ifdef __STDC__
  45 typedef void *POINTER;
  46 #else
  47 typedef char *POINTER;
  48 #endif
  49
  50 typedef unsigned long SIZE;
  51
  52 #ifdef NULL
  53 #undef NULL
  54 #endif
  55 #define NULL ((POINTER) 0)
  56
  57 extern POINTER start_of_data ();
  58 #ifdef DATA_SEG_BITS
  59 #define EXCEEDS_LISP_PTR(ptr) \
  60   (((unsigned int) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
  61 #else
  62 #define EXCEEDS_LISP_PTR(ptr) ((unsigned int) (ptr) >> VALBITS)
  63 #endif
  64
  65 #ifdef BSD
  66 #ifndef DATA_SEG_BITS
  67 extern char etext;
  68 #define start_of_data() &etext
  69 #endif
  70 #endif
  71
  72 #else  /* Not emacs */
  73 extern char etext;
  74 #define start_of_data() &etext
  75 #endif /* Not emacs */
  76
  77
  78
  79 /* start of data space; can be changed by calling malloc_init */
  80 static POINTER data_space_start;
  81
  82 /* Number of bytes of writable memory we can expect to be able to get */
  83 static unsigned int lim_data;
  84
  85 #ifdef USG
  86
  87 static void
  88 get_lim_data ()
  89 {
  90   extern long ulimit ();
  91
  92   lim_data = -1;
  93
  94   /* Use the ulimit call, if we seem to have it.  */
  95 #if !defined (ULIMIT_BREAK_VALUE) || defined (LINUX)
  96   lim_data = ulimit (3, 0);
  97 #endif
  98
  99   /* If that didn't work, just use the macro's value.  */
 100 #ifdef ULIMIT_BREAK_VALUE
 101   if (lim_data == -1)
 102     lim_data = ULIMIT_BREAK_VALUE;
 103 #endif
 104
 105   lim_data -= (long) data_space_start;
 106 }
 107
 108 #else /* not USG */
 109 #if !defined(BSD4_2) && !defined(__osf__)
 110
 111 static void
 112 get_lim_data ()
 113 {
 114   lim_data = vlimit (LIM_DATA, -1);
 115 }
 116
 117 #else /* BSD4_2 */
 118
 119 static void
 120 get_lim_data ()
 121 {
 122   struct rlimit XXrlimit;
 123
 124   getrlimit (RLIMIT_DATA, &XXrlimit);
 125 #ifdef RLIM_INFINITY
 126   lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
 127 #else
 128   lim_data = XXrlimit.rlim_cur; /* soft limit */
 129 #endif
 130 }
 131 #endif /* BSD4_2 */
 132 #endif /* not USG */