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[emacs.git] / src / mem-limits.h
blobdae4cf7fd45807c1d96fd48f3510ebff45bc86d3
1 /* Includes for memory limit warnings.
2 Copyright (C) 1990, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
4 This file is part of GNU Emacs.
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.
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.
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, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #ifdef MSDOS
22 #include <dpmi.h>
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 #if defined (__osf__) && (defined (__mips) || defined (mips) || defined(__alpha))
40 #include <sys/time.h>
41 #include <sys/resource.h>
42 #endif
44 #ifdef __bsdi__
45 #define BSD4_2
46 #endif
48 #ifndef BSD4_2
49 #ifndef USG
50 #ifndef MSDOS
51 #ifndef WINDOWSNT
52 #include <sys/vlimit.h>
53 #endif /* not WINDOWSNT */
54 #endif /* not MSDOS */
55 #endif /* not USG */
56 #else /* if BSD4_2 */
57 #include <sys/time.h>
58 #include <sys/resource.h>
59 #endif /* BSD4_2 */
61 #ifdef emacs
62 /* The important properties of this type are that 1) it's a pointer, and
63 2) arithmetic on it should work as if the size of the object pointed
64 to has a size of 1. */
65 typedef POINTER_TYPE *POINTER;
67 typedef unsigned long SIZE;
69 #ifdef NULL
70 #undef NULL
71 #endif
72 #define NULL ((POINTER) 0)
74 extern POINTER start_of_data ();
75 #ifdef DATA_SEG_BITS
76 #define EXCEEDS_LISP_PTR(ptr) \
77 (((EMACS_UINT) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
78 #else
79 #define EXCEEDS_LISP_PTR(ptr) ((EMACS_UINT) (ptr) >> VALBITS)
80 #endif
82 #ifdef BSD_SYSTEM
83 #ifndef DATA_SEG_BITS
84 extern char etext;
85 #define start_of_data() &etext
86 #endif
87 #endif
89 #else /* not emacs */
90 extern char etext;
91 #define start_of_data() &etext
92 #endif /* not emacs */
94 #endif /* not _LIBC */
97 /* start of data space; can be changed by calling malloc_init */
98 static POINTER data_space_start;
100 /* Number of bytes of writable memory we can expect to be able to get */
101 static unsigned long lim_data;
103 #ifdef NO_LIM_DATA
104 static void
105 get_lim_data ()
107 lim_data = -1;
109 #else /* not NO_LIM_DATA */
111 #ifdef USG
113 static void
114 get_lim_data ()
116 extern long ulimit ();
118 lim_data = -1;
120 /* Use the ulimit call, if we seem to have it. */
121 #if !defined (ULIMIT_BREAK_VALUE) || defined (LINUX)
122 lim_data = ulimit (3, 0);
123 #endif
125 /* If that didn't work, just use the macro's value. */
126 #ifdef ULIMIT_BREAK_VALUE
127 if (lim_data == -1)
128 lim_data = ULIMIT_BREAK_VALUE;
129 #endif
131 lim_data -= (long) data_space_start;
134 #else /* not USG */
135 #ifdef WINDOWSNT
137 static void
138 get_lim_data ()
140 extern unsigned long reserved_heap_size;
141 lim_data = reserved_heap_size;
144 #else
145 #if !defined (BSD4_2) && !defined (__osf__)
147 #ifdef MSDOS
148 void
149 get_lim_data ()
151 _go32_dpmi_meminfo info;
153 _go32_dpmi_get_free_memory_information (&info);
154 lim_data = info.available_memory;
156 #else /* not MSDOS */
157 static void
158 get_lim_data ()
160 lim_data = vlimit (LIM_DATA, -1);
162 #endif /* not MSDOS */
164 #else /* BSD4_2 */
166 static void
167 get_lim_data ()
169 struct rlimit XXrlimit;
171 getrlimit (RLIMIT_DATA, &XXrlimit);
172 #ifdef RLIM_INFINITY
173 lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
174 #else
175 lim_data = XXrlimit.rlim_cur; /* soft limit */
176 #endif
178 #endif /* BSD4_2 */
179 #endif /* not WINDOWSNT */
180 #endif /* not USG */
181 #endif /* not NO_LIM_DATA */