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https://github.com/RGBCube/serenity
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e21cc4cff6
This brings mmap more in line with other operating systems. Prior to this, it was impossible to request memory that was definitely committed, instead MAP_PURGEABLE would provide a region that was not actually purgeable, but also not fully committed, which meant that using such memory still could cause crashes when the underlying pages could no longer be allocated. This fixes some random crashes in low-memory situations where non-volatile memory is mapped (e.g. malloc, tls, Gfx::Bitmap, etc) but when a page in these regions is first accessed, there is insufficient physical memory available to commit a new page.
67 lines
2.5 KiB
C
67 lines
2.5 KiB
C
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#define MAP_FILE 0x00
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#define MAP_SHARED 0x01
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#define MAP_PRIVATE 0x02
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#define MAP_FIXED 0x10
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#define MAP_ANONYMOUS 0x20
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#define MAP_ANON MAP_ANONYMOUS
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#define MAP_STACK 0x40
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#define MAP_NORESERVE 0x80
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#define PROT_READ 0x1
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#define PROT_WRITE 0x2
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#define PROT_EXEC 0x4
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#define PROT_NONE 0x0
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#define MAP_FAILED ((void*)-1)
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#define MADV_SET_VOLATILE 0x100
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#define MADV_SET_NONVOLATILE 0x200
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#define MADV_GET_VOLATILE 0x400
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#define MAP_INHERIT_ZERO 1
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__BEGIN_DECLS
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void* mmap(void* addr, size_t, int prot, int flags, int fd, off_t);
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void* mmap_with_name(void* addr, size_t, int prot, int flags, int fd, off_t, const char* name);
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void* serenity_mmap(void* addr, size_t, int prot, int flags, int fd, off_t, size_t alignment, const char* name);
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void* mremap(void* old_address, size_t old_size, size_t new_size, int flags);
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int munmap(void*, size_t);
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int mprotect(void*, size_t, int prot);
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int set_mmap_name(void*, size_t, const char*);
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int madvise(void*, size_t, int advice);
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int minherit(void*, size_t, int inherit);
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void* allocate_tls(size_t);
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__END_DECLS
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