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bc511a64f6
Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/* simulate `sbrk' with an array in .bss, for `unexec' support for Cygwin;
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complete rewrite of xemacs Cygwin `unexec' code
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Copyright (C) 2004-2017 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include "sheap.h"
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#include <stdio.h>
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#include "lisp.h"
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#include <unistd.h>
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#include <stdlib.h> /* for exit */
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static int debug_sheap;
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char bss_sbrk_buffer[STATIC_HEAP_SIZE];
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char *max_bss_sbrk_ptr;
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bool bss_sbrk_did_unexec;
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void *
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bss_sbrk (ptrdiff_t request_size)
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{
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static char *bss_sbrk_ptr;
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if (!bss_sbrk_ptr)
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{
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max_bss_sbrk_ptr = bss_sbrk_ptr = bss_sbrk_buffer;
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#ifdef CYGWIN
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/* Force space for fork to work. */
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sbrk (4096);
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#endif
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}
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int used = bss_sbrk_ptr - bss_sbrk_buffer;
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if (request_size < -used)
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{
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printf (("attempt to free too much: "
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"avail %d used %d failed request %"pD"d\n"),
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STATIC_HEAP_SIZE, used, request_size);
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exit (-1);
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return 0;
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}
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else if (STATIC_HEAP_SIZE - used < request_size)
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{
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printf ("static heap exhausted: avail %d used %d failed request %"pD"d\n",
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STATIC_HEAP_SIZE, used, request_size);
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exit (-1);
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return 0;
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}
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void *ret = bss_sbrk_ptr;
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bss_sbrk_ptr += request_size;
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if (max_bss_sbrk_ptr < bss_sbrk_ptr)
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max_bss_sbrk_ptr = bss_sbrk_ptr;
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if (debug_sheap)
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{
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if (request_size < 0)
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printf ("freed size %"pD"d\n", request_size);
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else
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printf ("allocated %p size %"pD"d\n", ret, request_size);
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}
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return ret;
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}
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