mirror of
https://github.com/FFmpeg/FFmpeg.git
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Martin Storsjö
35b7df64a0
This file attempts to define _DEFAULT_SOURCE and similar macros
to affect the system headers regarding what APIs they expose.
However, as this file includes libavutil/error.h before defining
the _*_SOURCE macros, we may end up including system headers that
end up initializing which features are exposed, before we set our
defines (before including <sys/mman.h>).
This is not an issue with glibc 2.37 and newer, since those versions
stopped looking for defines like _DEFAULT_SOURCE for exposing
MAP_ANONYMOUS (see [1]). This wasn't an issue before these functions
were split out to a separate file in
4d9be5f57c either, as these defines
used to be set at the top of libswscale/utils.c, before including other
headers than config.h.
[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=954b8f38958de72c4712088735eb175118f17b51
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
/*
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* Copyright (C) 2005 Aurelien Jacobs <aurel@gnuage.org>
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* Copyright (C) 2009, 2026 Ramiro Polla <ramiro.polla@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#if HAVE_MMAP && HAVE_MPROTECT
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# define _DEFAULT_SOURCE
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# define _SVID_SOURCE // needed for MAP_ANONYMOUS
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# define _DARWIN_C_SOURCE // needed for MAP_ANON
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# include <sys/mman.h>
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# if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
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# define MAP_ANONYMOUS MAP_ANON
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# endif
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#endif
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#include "libavutil/error.h"
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#include "jit.h"
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#if HAVE_MMAP && HAVE_MPROTECT && defined(MAP_ANONYMOUS)
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void *ff_sws_jit_alloc(size_t size)
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{
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void *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (ptr == MAP_FAILED)
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return NULL;
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return ptr;
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}
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int ff_sws_jit_protect(void *ptr, size_t size)
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{
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if (mprotect(ptr, size, PROT_READ | PROT_EXEC) == -1)
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return AVERROR(errno);
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return 0;
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}
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void ff_sws_jit_free(void *ptr, size_t size)
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{
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if (ptr)
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munmap(ptr, size);
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}
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#elif HAVE_VIRTUALALLOC
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#include <windows.h>
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void *ff_sws_jit_alloc(size_t size)
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{
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return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
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}
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int ff_sws_jit_protect(void *ptr, size_t size)
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{
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DWORD old_protect;
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if (!VirtualProtect(ptr, size, PAGE_EXECUTE_READ, &old_protect))
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return AVERROR(EINVAL);
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return 0;
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}
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void ff_sws_jit_free(void *ptr, size_t size)
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{
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if (ptr)
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VirtualFree(ptr, 0, MEM_RELEASE);
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}
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#else
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#include "libavutil/mem.h"
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void *ff_sws_jit_alloc(size_t size)
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{
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return av_malloc(size);
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}
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int ff_sws_jit_protect(void *ptr, size_t size)
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{
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return 0;
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}
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void ff_sws_jit_free(void *ptr, size_t size)
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{
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av_free(ptr);
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}
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#endif
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