e184423526
For processes that start very early, atrace initialization can cause an selinux denial, so make sure it's possible to disable it and avoid the call to open "trace_marker". Bug: 63927601 Test: disable atrace early in vold, ensure that selinux denial is avoided. Change-Id: I2422e6d0db323bc13c6d6ed1896435151fca21f7
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
/*
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* Copyright (C) 2012 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 <cutils/trace.h>
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#include "trace-dev.inc"
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static pthread_once_t atrace_once_control = PTHREAD_ONCE_INIT;
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// Set whether tracing is enabled in this process. This is used to prevent
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// the Zygote process from tracing.
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void atrace_set_tracing_enabled(bool enabled)
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{
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atomic_store_explicit(&atrace_is_enabled, enabled, memory_order_release);
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atomic_store_explicit(&atrace_is_ready, false, memory_order_release);
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atrace_update_tags();
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}
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static void atrace_init_once()
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{
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atrace_marker_fd = open("/sys/kernel/debug/tracing/trace_marker", O_WRONLY | O_CLOEXEC);
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if (atrace_marker_fd == -1) {
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ALOGE("Error opening trace file: %s (%d)", strerror(errno), errno);
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atrace_enabled_tags = 0;
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return;
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}
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atrace_enabled_tags = atrace_get_property();
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}
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void atrace_setup()
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{
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if (atomic_load_explicit(&atrace_is_enabled, memory_order_acquire)) {
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pthread_once(&atrace_once_control, atrace_init_once);
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}
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atomic_store_explicit(&atrace_is_ready, true, memory_order_release);
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}
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void atrace_begin_body(const char* name)
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{
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WRITE_MSG("B|%d|", "%s", name, "");
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}
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void atrace_end_body()
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{
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WRITE_MSG("E|%d", "%s", "", "");
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}
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void atrace_async_begin_body(const char* name, int32_t cookie)
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{
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WRITE_MSG("S|%d|", "|%" PRId32, name, cookie);
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}
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void atrace_async_end_body(const char* name, int32_t cookie)
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{
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WRITE_MSG("F|%d|", "|%" PRId32, name, cookie);
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}
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void atrace_int_body(const char* name, int32_t value)
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{
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WRITE_MSG("C|%d|", "|%" PRId32, name, value);
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}
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void atrace_int64_body(const char* name, int64_t value)
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{
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WRITE_MSG("C|%d|", "|%" PRId64, name, value);
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}
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