e4030384c4
When Android is running in a container, ftrace trace_marker may be disabled, e.g. Chrome OS verified mode. To enable trace, a socket is created for everyone to send trace event. Modify libcutils so apps using it can write trace to the socket. To achieve this goal without touching code for normal device, trace-container.c is created for code specific to container. Shared code between trace-dev.c and trace-container.c is moved to local trace-dev.h. Note that to avoid sharing FDs across different processes, Zygote closes FD and reopen it to /dev/null if it is a socket. Therefore, we need to manually close FD and reopen it again after forking. This is done in the atrace_set_tracing_enabled as Zygote also use it to clear flags during forking. Related change: - http://crrev.com/2400163003 (Chromium) - http://ag/2028075 (Android system/core) - http://ag/1738271 (Android device/google/cheets2) Bug: 29776474, 62410809 Test: run chrome://tracing and see data from the host side. Change-Id: I3fe969e284b972c28e4f32f23cd948aaea61a043
77 lines
2 KiB
C
77 lines
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 "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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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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goto done;
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}
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atrace_enabled_tags = atrace_get_property();
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done:
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atomic_store_explicit(&atrace_is_ready, true, memory_order_release);
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}
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void atrace_setup()
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{
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pthread_once(&atrace_once_control, atrace_init_once);
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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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