175c8867b0
This patch refactors heapprofd_malloc to make it easier to reuse the reserved signal for multiple purposes. We define a new generic signal handler for profilers, which dispatches to more specific logic based on the signal's payload (si_value). The profiler signal handler is installed during libc preinit, after malloc initialization (so races against synchronous heapprofd initialization need not be considered). In terms of code organization, I copied the existing approach with a loosely referenced function in bionic_globals.h. Do tell if you'd rather a different approach here. The profileability of a process is quite tied to the malloc files/interfaces in bionic - in particular, it's set through android_mallopt. I do not change that, but instead introduce a new android_mallopt option to be able to query profileability of the process (which is now used by the new profiler signal handler). As part of that, gZygoteChildProfileable is moved from heapprofd_malloc to common (alongside gZygoteChild). I've removed the masking and reraising of the heapprofd signal when racing against malloc_limit init. We're ok with taking a simpler approach and dropping the heapprofd signal in such an unlikely race. Note: this requires a corresponding change in heapprofd to use sigqueue() instead of kill(), as the latter leaves the si_value uninitialized(?) on the receiving side. Bug: 144281346 Change-Id: I93bb2e82cff5870e5ca499cf86439860aca9dfa5
46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/*
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* Copyright (C) 2019 The Android Open Source Project
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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
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* 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
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <stdint.h>
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#include <private/bionic_globals.h>
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bool HeapprofdShouldLoad();
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void HeapprofdInstallHooksAtInit(libc_globals* globals);
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void HeapprofdRememberHookConflict();
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void HandleHeapprofdSignal();
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bool HeapprofdInitZygoteChildProfiling();
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bool HeapprofdMallopt(int optcode, void* arg, size_t arg_size);
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