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[emacs.git] / src / mem-limits.h
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1 /* Includes for memory limit warnings.
2 Copyright (C) 1990, 1993, 1994, 1995, 1996, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 GNU Emacs 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
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
20 #ifdef MSDOS
21 #include <dpmi.h>
22 extern int etext;
23 #endif
25 /* Some systems need this before <sys/resource.h>. */
26 #include <sys/types.h>
28 #ifdef _LIBC
30 #include <sys/resource.h>
31 #define BSD4_2 /* Tell code below to use getrlimit. */
33 /* Old Linux startup code won't define __data_start. */
34 extern int etext, __data_start; weak_extern (__data_start)
35 #define start_of_data() (&__data_start ?: &etext)
37 #else /* not _LIBC */
39 #ifdef HAVE_SYS_RESOURCE_H
40 # include <sys/time.h>
41 # include <sys/resource.h>
42 #else
43 # if HAVE_SYS_VLIMIT_H
44 # include <sys/vlimit.h> /* Obsolete, says glibc */
45 # endif
46 #endif
48 #ifdef CYGWIN
49 #define BSD4_2
50 #endif
52 #ifndef BSD4_2
53 #ifndef USG
54 #ifndef MSDOS
55 #ifndef WINDOWSNT
56 #include <sys/vlimit.h>
57 #endif /* not WINDOWSNT */
58 #endif /* not MSDOS */
59 #endif /* not USG */
60 #else /* if BSD4_2 */
61 #include <sys/time.h>
62 #include <sys/resource.h>
63 #endif /* BSD4_2 */
65 #ifdef emacs
66 /* The important properties of this type are that 1) it's a pointer, and
67 2) arithmetic on it should work as if the size of the object pointed
68 to has a size of 1. */
69 typedef POINTER_TYPE *POINTER;
71 typedef unsigned long SIZE;
73 #ifdef NULL
74 #undef NULL
75 #endif
76 #define NULL ((POINTER) 0)
78 extern POINTER start_of_data ();
79 #if defined USE_LSB_TAG
80 #define EXCEEDS_LISP_PTR(ptr) 0
81 #elif defined DATA_SEG_BITS
82 #define EXCEEDS_LISP_PTR(ptr) \
83 (((EMACS_UINT) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
84 #else
85 #define EXCEEDS_LISP_PTR(ptr) ((EMACS_UINT) (ptr) >> VALBITS)
86 #endif
88 #ifdef DATA_START
89 #define start_of_data() ((char *)DATA_START)
90 #endif
92 #ifdef BSD_SYSTEM
93 #ifndef DATA_SEG_BITS
94 #ifndef DATA_START
95 extern char etext;
96 #define start_of_data() &etext
97 #endif
98 #endif
99 #endif
101 #else /* not emacs */
102 extern char etext;
103 #define start_of_data() &etext
104 #endif /* not emacs */
106 #endif /* not _LIBC */
109 /* arch-tag: fe39244e-e54f-4208-b7aa-02556f7841c5
110 (do not change this comment) */