7a3681e5b6
This library is used by a number of different libraries in the system. Make it easy for platform libraries to use this library and create an actual exported include file. Change the names of the functions to reflect the new name of the library. Run clang_format on the async_safe_log.cpp file since the formatting is all over the place. Bug: 31919199 Test: Compiled for angler/bullhead, and booted. Test: Ran bionic unit tests. Test: Ran the malloc debug tests. Change-Id: I8071bf690c17b0ea3bc8dc5749cdd5b6ad58478a
102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "private/bionic_lock.h"
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#include "private/bionic_systrace.h"
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#include "private/CachedProperty.h"
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#include <cutils/trace.h> // For ATRACE_TAG_BIONIC.
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#define WRITE_OFFSET 32
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static Lock g_lock;
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static int g_trace_marker_fd = -1;
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static bool should_trace() {
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static CachedProperty g_debug_atrace_tags_enableflags("debug.atrace.tags.enableflags");
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static uint64_t g_tags;
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g_lock.lock();
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if (g_debug_atrace_tags_enableflags.DidChange()) {
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g_tags = strtoull(g_debug_atrace_tags_enableflags.Get(), nullptr, 0);
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}
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g_lock.unlock();
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return ((g_tags & ATRACE_TAG_BIONIC) != 0);
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}
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static int get_trace_marker_fd() {
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g_lock.lock();
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if (g_trace_marker_fd == -1) {
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g_trace_marker_fd = open("/sys/kernel/debug/tracing/trace_marker", O_CLOEXEC | O_WRONLY);
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}
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g_lock.unlock();
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return g_trace_marker_fd;
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}
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void bionic_trace_begin(const char* message) {
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if (!should_trace()) {
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return;
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}
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int trace_marker_fd = get_trace_marker_fd();
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if (trace_marker_fd == -1) {
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return;
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}
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// If bionic tracing has been enabled, then write the message to the
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// kernel trace_marker.
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int length = strlen(message);
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char buf[length + WRITE_OFFSET];
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size_t len = snprintf(buf, length + WRITE_OFFSET, "B|%d|%s", getpid(), message);
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// Tracing may stop just after checking property and before writing the message.
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// So the write is acceptable to fail. See b/20666100.
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TEMP_FAILURE_RETRY(write(trace_marker_fd, buf, len));
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}
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void bionic_trace_end() {
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if (!should_trace()) {
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return;
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}
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int trace_marker_fd = get_trace_marker_fd();
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if (trace_marker_fd == -1) {
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return;
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}
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TEMP_FAILURE_RETRY(write(trace_marker_fd, "E", 1));
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}
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ScopedTrace::ScopedTrace(const char* message) : called_end_(false) {
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bionic_trace_begin(message);
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}
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ScopedTrace::~ScopedTrace() {
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End();
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}
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void ScopedTrace::End() {
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if (!called_end_) {
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bionic_trace_end();
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called_end_ = true;
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}
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}
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