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130 lines
4.7 KiB
130 lines
4.7 KiB
/*
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* Copyright (C) 2005-2017 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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#pragma once
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#include <stdint.h>
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#include <sys/types.h>
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#include <android/log.h>
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#include <log/log_time.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ANDROID_LOG_WRAP_DEFAULT_TIMEOUT 7200 /* 2 hour default */
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/*
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* Native log reading interface section. See logcat for sample code.
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*
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* The preferred API is an exec of logcat. Likely uses of this interface
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* are if native code suffers from exec or filtration being too costly,
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* access to raw information, or parsing is an issue.
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*/
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struct logger_entry {
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uint16_t len; /* length of the payload */
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uint16_t hdr_size; /* sizeof(struct logger_entry) */
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int32_t pid; /* generating process's pid */
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uint32_t tid; /* generating process's tid */
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uint32_t sec; /* seconds since Epoch */
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uint32_t nsec; /* nanoseconds */
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uint32_t lid; /* log id of the payload, bottom 4 bits currently */
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uint32_t uid; /* generating process's uid */
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};
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/*
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* The maximum size of a log entry which can be read.
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* An attempt to read less than this amount may result
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* in read() returning EINVAL.
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*/
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#define LOGGER_ENTRY_MAX_LEN (5 * 1024)
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struct log_msg {
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union {
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unsigned char buf[LOGGER_ENTRY_MAX_LEN + 1];
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struct logger_entry entry;
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} __attribute__((aligned(4)));
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#ifdef __cplusplus
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uint64_t nsec() const {
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return static_cast<uint64_t>(entry.sec) * NS_PER_SEC + entry.nsec;
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}
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log_id_t id() {
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return static_cast<log_id_t>(entry.lid);
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}
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char* msg() {
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unsigned short hdr_size = entry.hdr_size;
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if (hdr_size >= sizeof(struct log_msg) - sizeof(entry)) {
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return nullptr;
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}
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return reinterpret_cast<char*>(buf) + hdr_size;
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}
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unsigned int len() { return entry.hdr_size + entry.len; }
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#endif
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};
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struct logger;
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log_id_t android_logger_get_id(struct logger* logger);
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/* Clears the given log buffer. */
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int android_logger_clear(struct logger* logger);
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/* Return the allotted size for the given log buffer. */
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long android_logger_get_log_size(struct logger* logger);
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/* Set the allotted size for the given log buffer. */
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int android_logger_set_log_size(struct logger* logger, unsigned long size);
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/* Return the actual, uncompressed size that can be read from the given log buffer. */
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long android_logger_get_log_readable_size(struct logger* logger);
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/* Return the actual, compressed size that the given log buffer is consuming. */
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long android_logger_get_log_consumed_size(struct logger* logger);
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/* Deprecated. Always returns '4' regardless of input. */
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int android_logger_get_log_version(struct logger* logger);
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struct logger_list;
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ssize_t android_logger_get_statistics(struct logger_list* logger_list,
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char* buf, size_t len);
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ssize_t android_logger_get_prune_list(struct logger_list* logger_list,
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char* buf, size_t len);
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int android_logger_set_prune_list(struct logger_list* logger_list, const char* buf, size_t len);
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/* The below values are used for the `mode` argument of the below functions. */
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/* Note that 0x00000003 were previously used and should be considered reserved. */
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#define ANDROID_LOG_NONBLOCK 0x00000800
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#define ANDROID_LOG_WRAP 0x40000000 /* Block until buffer about to wrap */
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#define ANDROID_LOG_PSTORE 0x80000000
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struct logger_list* android_logger_list_alloc(int mode, unsigned int tail,
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pid_t pid);
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struct logger_list* android_logger_list_alloc_time(int mode, log_time start,
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pid_t pid);
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void android_logger_list_free(struct logger_list* logger_list);
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/* In the purest sense, the following two are orthogonal interfaces */
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int android_logger_list_read(struct logger_list* logger_list,
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struct log_msg* log_msg);
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/* Multiple log_id_t opens */
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struct logger* android_logger_open(struct logger_list* logger_list, log_id_t id);
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/* Single log_id_t open */
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struct logger_list* android_logger_list_open(log_id_t id, int mode,
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unsigned int tail, pid_t pid);
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#define android_logger_list_close android_logger_list_free
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#ifdef __cplusplus
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}
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#endif
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