90 lines
3.5 KiB
C
90 lines
3.5 KiB
C
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_PROCESS_MEMORY_H_
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#define BASE_PROCESS_MEMORY_H_
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#include <stddef.h>
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#include "base/base_export.h"
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#include "base/process/process_handle.h"
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#include "build/build_config.h"
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namespace base {
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// Enables 'terminate on heap corruption' flag. Helps protect against heap
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// overflow. Has no effect if the OS doesn't provide the necessary facility.
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BASE_EXPORT void EnableTerminationOnHeapCorruption();
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// Turns on process termination if memory runs out.
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BASE_EXPORT void EnableTerminationOnOutOfMemory();
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// Terminates process. Should be called only for out of memory errors.
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// Crash reporting classifies such crashes as OOM.
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BASE_EXPORT void TerminateBecauseOutOfMemory(size_t size);
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#if defined(OS_LINUX) || defined(OS_ANDROID) || defined(OS_AIX)
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BASE_EXPORT extern size_t g_oom_size;
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// The maximum allowed value for the OOM score.
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const int kMaxOomScore = 1000;
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// This adjusts /proc/<pid>/oom_score_adj so the Linux OOM killer will
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// prefer to kill certain process types over others. The range for the
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// adjustment is [-1000, 1000], with [0, 1000] being user accessible.
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// If the Linux system doesn't support the newer oom_score_adj range
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// of [0, 1000], then we revert to using the older oom_adj, and
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// translate the given value into [0, 15]. Some aliasing of values
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// may occur in that case, of course.
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BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score);
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#endif
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namespace internal {
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// Returns true if address-space was released. Some configurations reserve part
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// of the process address-space for special allocations (e.g. WASM).
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bool ReleaseAddressSpaceReservation();
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} // namespace internal
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#if defined(OS_WIN)
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namespace win {
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// Custom Windows exception code chosen to indicate an out of memory error.
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// See https://msdn.microsoft.com/en-us/library/het71c37.aspx.
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// "To make sure that you do not define a code that conflicts with an existing
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// exception code" ... "The resulting error code should therefore have the
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// highest four bits set to hexadecimal E."
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// 0xe0000008 was chosen arbitrarily, as 0x00000008 is ERROR_NOT_ENOUGH_MEMORY.
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const DWORD kOomExceptionCode = 0xe0000008;
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} // namespace win
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#endif
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namespace internal {
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// Handles out of memory, with the failed allocation |size|, or 0 when it is not
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// known.
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BASE_EXPORT NOINLINE void OnNoMemoryInternal(size_t size);
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} // namespace internal
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// Special allocator functions for callers that want to check for OOM.
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// These will not abort if the allocation fails even if
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// EnableTerminationOnOutOfMemory has been called.
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// This can be useful for huge and/or unpredictable size memory allocations.
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// Please only use this if you really handle the case when the allocation
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// fails. Doing otherwise would risk security.
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// These functions may still crash on OOM when running under memory tools,
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// specifically ASan and other sanitizers.
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// Return value tells whether the allocation succeeded. If it fails |result| is
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// set to NULL, otherwise it holds the memory address.
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BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedMalloc(size_t size,
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void** result);
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BASE_EXPORT WARN_UNUSED_RESULT bool UncheckedCalloc(size_t num_items,
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size_t size,
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void** result);
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} // namespace base
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#endif // BASE_PROCESS_MEMORY_H_
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