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acebbab3 RS |
1 | /* simulate `sbrk' with an array in .bss, for `unexec' support for Cygwin; |
2 | complete rewrite of xemacs Cygwin `unexec' code | |
3e62da95 | 3 | |
4e6835db | 4 | Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
3e62da95 SM |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
8 | GNU Emacs is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
684d6f5b | 10 | the Free Software Foundation; either version 3, or (at your option) |
3e62da95 SM |
11 | any later version. |
12 | ||
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GNU Emacs; see the file COPYING. If not, write to | |
4fc5845f LK |
20 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | Boston, MA 02110-1301, USA. */ | |
3e62da95 SM |
22 | |
23 | #include <config.h> | |
24 | #include <stdio.h> | |
25 | #include "lisp.h" | |
26 | ||
27 | #include <unistd.h> | |
28 | ||
50f9edc2 | 29 | #define STATIC_HEAP_SIZE (12 * 1024 * 1024) |
3e62da95 SM |
30 | |
31 | int debug_sheap = 0; | |
32 | ||
33 | #define BLOCKSIZE 4096 | |
34 | ||
35 | char bss_sbrk_buffer[STATIC_HEAP_SIZE]; | |
36 | char *bss_sbrk_ptr; | |
37 | int bss_sbrk_did_unexec; | |
38 | ||
39 | void * | |
40 | bss_sbrk (ptrdiff_t request_size) | |
41 | { | |
42 | if (!bss_sbrk_ptr) | |
43 | { | |
44 | bss_sbrk_ptr = bss_sbrk_buffer; | |
45 | #ifdef CYGWIN | |
46 | sbrk (BLOCKSIZE); /* force space for fork to work */ | |
47 | #endif | |
48 | } | |
49 | ||
50 | if (!(int) request_size) | |
51 | { | |
52 | return (bss_sbrk_ptr); | |
53 | } | |
54 | else if (bss_sbrk_ptr + (int) request_size < bss_sbrk_buffer) | |
55 | { | |
56 | printf | |
57 | ("attempt to free too much: avail %d used %d failed request %d\n", | |
58 | STATIC_HEAP_SIZE, bss_sbrk_ptr - bss_sbrk_buffer, | |
59 | (int) request_size); | |
60 | exit (-1); | |
61 | return 0; | |
62 | } | |
63 | else if (bss_sbrk_ptr + (int) request_size > | |
64 | bss_sbrk_buffer + STATIC_HEAP_SIZE) | |
65 | { | |
66 | printf ("static heap exhausted: avail %d used %d failed request %d\n", | |
67 | STATIC_HEAP_SIZE, | |
68 | bss_sbrk_ptr - bss_sbrk_buffer, (int) request_size); | |
69 | exit (-1); | |
70 | return 0; | |
71 | } | |
72 | else if ((int) request_size < 0) | |
73 | { | |
74 | bss_sbrk_ptr += (int) request_size; | |
75 | if (debug_sheap) | |
76 | printf ("freed size %d\n", request_size); | |
77 | return bss_sbrk_ptr; | |
78 | } | |
79 | else | |
80 | { | |
81 | char *ret = bss_sbrk_ptr; | |
82 | if (debug_sheap) | |
83 | printf ("allocated 0x%08x size %d\n", ret, request_size); | |
84 | bss_sbrk_ptr += (int) request_size; | |
85 | return ret; | |
86 | } | |
87 | } | |
88 | ||
89 | void | |
90 | report_sheap_usage (int die_if_pure_storage_exceeded) | |
91 | { | |
92 | char buf[200]; | |
93 | sprintf (buf, "Static heap usage: %d of %d bytes", | |
94 | bss_sbrk_ptr - bss_sbrk_buffer, STATIC_HEAP_SIZE); | |
95 | message ("%s", buf); | |
96 | } | |
92713841 MB |
97 | |
98 | /* arch-tag: 1bc386e8-71c2-4da4-b8b5-c1674a9cf926 | |
99 | (do not change this comment) */ |