f6e5b58260
Add two functions to allow objects that own a file descriptor to enforce that only they can close their file descriptor. Use them in FILE* and DIR*. Bug: http://b/110100358 Test: bionic_unit_tests Test: aosp/master boots without errors Test: treehugger Change-Id: Iecd6e8b26c62217271e0822dc3d2d7888b091a45
55 lines
2 KiB
C++
55 lines
2 KiB
C++
/*
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* Copyright (C) 2014 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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#include <unistd.h>
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#include "pthread_internal.h"
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extern "C" pid_t __getpid();
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pid_t __get_cached_pid() {
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pthread_internal_t* self = __get_thread();
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if (__predict_true(self)) {
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pid_t cached_pid;
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if (__predict_true(self->get_cached_pid(&cached_pid))) {
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return cached_pid;
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}
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}
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return 0;
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}
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pid_t getpid() {
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pid_t cached_pid = __get_cached_pid();
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if (__predict_true(cached_pid != 0)) {
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return cached_pid;
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}
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// We're still in the dynamic linker or we're in the middle of forking, so ask the kernel.
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// We don't know whether it's safe to update the cached value, so don't try.
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return __getpid();
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}
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