e7bb7bca4f
Adds a function to read the current trace system property value, and sets the trace tags to it, do be used as a sysprop change callback. Change-Id: Ia6336652173aa5b07188898736c2c795a69fe79a
88 lines
2.7 KiB
C
88 lines
2.7 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 <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <cutils/atomic.h>
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#include <cutils/compiler.h>
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#include <cutils/properties.h>
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#include <cutils/trace.h>
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#define LOG_TAG "cutils-trace"
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#include <cutils/log.h>
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int32_t atrace_is_ready = 0;
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int atrace_marker_fd = -1;
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uint64_t atrace_enabled_tags = ATRACE_TAG_NOT_READY;
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static pthread_once_t atrace_once_control = PTHREAD_ONCE_INIT;
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static pthread_mutex_t atrace_tags_mutex = PTHREAD_MUTEX_INITIALIZER;
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// Read the sysprop and return the value tags should be set to
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static uint64_t atrace_get_property()
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{
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char value[PROPERTY_VALUE_MAX];
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char *endptr;
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uint64_t tags;
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property_get("debug.atrace.tags.enableflags", value, "0");
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errno = 0;
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tags = strtoull(value, &endptr, 0);
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if (value[0] == '\0' || *endptr != '\0') {
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ALOGE("Error parsing trace property: Not a number: %s", value);
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return 0;
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} else if (errno == ERANGE || tags == ULLONG_MAX) {
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ALOGE("Error parsing trace property: Number too large: %s", value);
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return 0;
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}
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return (tags | ATRACE_TAG_ALWAYS) & ATRACE_TAG_VALID_MASK;
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}
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// Update tags if tracing is ready. Useful as a sysprop change callback.
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void atrace_update_tags()
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{
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uint64_t tags;
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if (CC_UNLIKELY(android_atomic_acquire_load(&atrace_is_ready))) {
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tags = atrace_get_property();
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pthread_mutex_lock(&atrace_tags_mutex);
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atrace_enabled_tags = tags;
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pthread_mutex_unlock(&atrace_tags_mutex);
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}
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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);
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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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android_atomic_release_store(1, &atrace_is_ready);
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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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