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[emacs.git] / src / mem-limits.h
blob57a79863a1b50daa875541a7d8f1d9c343fb9764
1 /* Includes for memory limit warnings.
2 Copyright (C) 1990, 93, 94, 95, 1996, 2004 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 extern int etext;
24 #endif
26 /* Some systems need this before <sys/resource.h>. */
27 #include <sys/types.h>
29 #ifdef _LIBC
31 #include <sys/resource.h>
32 #define BSD4_2 /* Tell code below to use getrlimit. */
34 /* Old Linux startup code won't define __data_start. */
35 extern int etext, __data_start; weak_extern (__data_start)
36 #define start_of_data() (&__data_start ?: &etext)
38 #else /* not _LIBC */
40 #ifdef HAVE_SYS_RESOURCE_H
41 # include <sys/time.h>
42 # include <sys/resource.h>
43 #else
44 # if HAVE_SYS_VLIMIT_H
45 # include <sys/vlimit.h> /* Obsolete, says glibc */
46 # endif
47 #endif
49 #ifdef __bsdi__
50 #define BSD4_2
51 #endif
53 #ifdef CYGWIN
54 #define BSD4_2
55 #endif
57 #ifndef BSD4_2
58 #ifndef USG
59 #ifndef MSDOS
60 #ifndef WINDOWSNT
61 #include <sys/vlimit.h>
62 #endif /* not WINDOWSNT */
63 #endif /* not MSDOS */
64 #endif /* not USG */
65 #else /* if BSD4_2 */
66 #include <sys/time.h>
67 #include <sys/resource.h>
68 #endif /* BSD4_2 */
70 #ifdef emacs
71 /* The important properties of this type are that 1) it's a pointer, and
72 2) arithmetic on it should work as if the size of the object pointed
73 to has a size of 1. */
74 typedef POINTER_TYPE *POINTER;
76 typedef unsigned long SIZE;
78 #ifdef NULL
79 #undef NULL
80 #endif
81 #define NULL ((POINTER) 0)
83 extern POINTER start_of_data ();
84 #if defined USE_LSB_TAG
85 #define EXCEEDS_LISP_PTR(ptr) 0
86 #elif defined DATA_SEG_BITS
87 #define EXCEEDS_LISP_PTR(ptr) \
88 (((EMACS_UINT) (ptr) & ~DATA_SEG_BITS) >> VALBITS)
89 #else
90 #define EXCEEDS_LISP_PTR(ptr) ((EMACS_UINT) (ptr) >> VALBITS)
91 #endif
93 #ifdef DATA_START
94 #define start_of_data() ((char *)DATA_START)
95 #endif
97 #ifdef BSD_SYSTEM
98 #ifndef DATA_SEG_BITS
99 #ifndef DATA_START
100 extern char etext;
101 #define start_of_data() &etext
102 #endif
103 #endif
104 #endif
106 #else /* not emacs */
107 extern char etext;
108 #define start_of_data() &etext
109 #endif /* not emacs */
111 #endif /* not _LIBC */
114 /* start of data space; can be changed by calling malloc_init */
115 static POINTER data_space_start;
117 /* Number of bytes of writable memory we can expect to be able to get */
118 static unsigned long lim_data;
120 #ifdef NO_LIM_DATA
121 static void
122 get_lim_data ()
124 lim_data = -1;
126 #else /* not NO_LIM_DATA */
128 #ifdef USG
130 static void
131 get_lim_data ()
133 extern long ulimit ();
135 lim_data = -1;
137 /* Use the ulimit call, if we seem to have it. */
138 #if !defined (ULIMIT_BREAK_VALUE) || defined (GNU_LINUX)
139 lim_data = ulimit (3, 0);
140 #endif
142 /* If that didn't work, just use the macro's value. */
143 #ifdef ULIMIT_BREAK_VALUE
144 if (lim_data == -1)
145 lim_data = ULIMIT_BREAK_VALUE;
146 #endif
148 lim_data -= (long) data_space_start;
151 #else /* not USG */
152 #ifdef WINDOWSNT
154 static void
155 get_lim_data ()
157 extern unsigned long reserved_heap_size;
158 lim_data = reserved_heap_size;
161 #else
162 #if !defined (BSD4_2) && !defined (__osf__)
164 #ifdef MSDOS
165 void
166 get_lim_data ()
168 _go32_dpmi_meminfo info;
170 _go32_dpmi_get_free_memory_information (&info);
171 lim_data = info.available_memory;
173 #else /* not MSDOS */
174 static void
175 get_lim_data ()
177 lim_data = vlimit (LIM_DATA, -1);
179 #endif /* not MSDOS */
181 #else /* BSD4_2 */
183 static void
184 get_lim_data ()
186 struct rlimit XXrlimit;
188 getrlimit (RLIMIT_DATA, &XXrlimit);
189 #ifdef RLIM_INFINITY
190 lim_data = XXrlimit.rlim_cur & RLIM_INFINITY; /* soft limit */
191 #else
192 lim_data = XXrlimit.rlim_cur; /* soft limit */
193 #endif
195 #endif /* BSD4_2 */
196 #endif /* not WINDOWSNT */
197 #endif /* not USG */
198 #endif /* not NO_LIM_DATA */
200 /* arch-tag: fe39244e-e54f-4208-b7aa-02556f7841c5
201 (do not change this comment) */