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114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
// 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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#include "base/process/memory.h"
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#include <stddef.h>
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#include <new>
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#include "base/allocator/allocator_shim.h"
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#include "base/allocator/features.h"
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#include "base/files/file_path.h"
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#include "base/files/file_util.h"
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#include "base/logging.h"
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#include "base/process/internal_linux.h"
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#include "base/strings/string_number_conversions.h"
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#include "build/build_config.h"
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#if defined(USE_TCMALLOC)
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#include "third_party/tcmalloc/chromium/src/gperftools/tcmalloc.h"
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#endif
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namespace base {
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size_t g_oom_size = 0U;
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namespace {
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void OnNoMemorySize(size_t size) {
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g_oom_size = size;
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if (size != 0)
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LOG(FATAL) << "Out of memory, size = " << size;
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LOG(FATAL) << "Out of memory.";
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}
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void OnNoMemory() {
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OnNoMemorySize(0);
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}
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} // namespace
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void EnableTerminationOnHeapCorruption() {
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// On Linux, there nothing to do AFAIK.
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}
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void EnableTerminationOnOutOfMemory() {
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// Set the new-out of memory handler.
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std::set_new_handler(&OnNoMemory);
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// If we're using glibc's allocator, the above functions will override
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// malloc and friends and make them die on out of memory.
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#if BUILDFLAG(USE_ALLOCATOR_SHIM)
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allocator::SetCallNewHandlerOnMallocFailure(true);
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#elif defined(USE_TCMALLOC)
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// For tcmalloc, we need to tell it to behave like new.
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tc_set_new_mode(1);
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#endif
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}
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// NOTE: This is not the only version of this function in the source:
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// the setuid sandbox (in process_util_linux.c, in the sandbox source)
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// also has its own C version.
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bool AdjustOOMScore(ProcessId process, int score) {
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if (score < 0 || score > kMaxOomScore)
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return false;
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FilePath oom_path(internal::GetProcPidDir(process));
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// Attempt to write the newer oom_score_adj file first.
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FilePath oom_file = oom_path.AppendASCII("oom_score_adj");
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if (PathExists(oom_file)) {
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std::string score_str = IntToString(score);
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DVLOG(1) << "Adjusting oom_score_adj of " << process << " to "
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<< score_str;
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int score_len = static_cast<int>(score_str.length());
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return (score_len == WriteFile(oom_file, score_str.c_str(), score_len));
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}
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// If the oom_score_adj file doesn't exist, then we write the old
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// style file and translate the oom_adj score to the range 0-15.
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oom_file = oom_path.AppendASCII("oom_adj");
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if (PathExists(oom_file)) {
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// Max score for the old oom_adj range. Used for conversion of new
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// values to old values.
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const int kMaxOldOomScore = 15;
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int converted_score = score * kMaxOldOomScore / kMaxOomScore;
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std::string score_str = IntToString(converted_score);
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DVLOG(1) << "Adjusting oom_adj of " << process << " to " << score_str;
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int score_len = static_cast<int>(score_str.length());
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return (score_len == WriteFile(oom_file, score_str.c_str(), score_len));
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}
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return false;
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}
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bool UncheckedMalloc(size_t size, void** result) {
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#if BUILDFLAG(USE_ALLOCATOR_SHIM)
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*result = allocator::UncheckedAlloc(size);
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#elif defined(MEMORY_TOOL_REPLACES_ALLOCATOR) || \
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(!defined(LIBC_GLIBC) && !defined(USE_TCMALLOC))
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*result = malloc(size);
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#elif defined(LIBC_GLIBC) && !defined(USE_TCMALLOC)
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*result = __libc_malloc(size);
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#elif defined(USE_TCMALLOC)
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*result = tc_malloc_skip_new_handler(size);
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#endif
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return *result != NULL;
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}
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} // namespace base
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