148 lines
5.3 KiB
C
148 lines
5.3 KiB
C
/*
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* Copyright (C) 2016 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 <stdatomic.h>
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#include <cutils/list.h>
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#include <log/log.h>
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#include "log_portability.h"
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#include "uio.h"
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__BEGIN_DECLS
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/* Union, sock or fd of zero is not allowed unless static initialized */
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union android_log_context_union {
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void* priv;
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atomic_int sock;
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atomic_int fd;
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};
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struct android_log_transport_write {
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const char* name; /* human name to describe the transport */
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unsigned logMask; /* mask cache of available() success */
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union android_log_context_union context; /* Initialized by static allocation */
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int (*available)(log_id_t logId); /* Does not cause resources to be taken */
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int (*open)(); /* can be called multiple times, reusing current resources */
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void (*close)(); /* free up resources */
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/* write log to transport, returns number of bytes propagated, or -errno */
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int (*write)(log_id_t logId, struct timespec* ts, struct iovec* vec,
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size_t nr);
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};
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struct android_log_logger_list;
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struct android_log_transport_context;
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struct android_log_logger;
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struct android_log_transport_read {
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const char* name; /* human name to describe the transport */
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/* Does not cause resources to be taken */
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int (*available)(log_id_t logId);
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int (*version)(struct android_log_logger* logger,
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struct android_log_transport_context* transp);
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/* Release resources taken by the following interfaces */
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void (*close)(struct android_log_logger_list* logger_list,
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struct android_log_transport_context* transp);
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/*
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* Expect all to instantiate open automagically on any call,
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* so we do not have an explicit open call.
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*/
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int (*read)(struct android_log_logger_list* logger_list,
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struct android_log_transport_context* transp,
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struct log_msg* log_msg);
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/* Must only be called if not ANDROID_LOG_NONBLOCK (blocking) */
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int (*poll)(struct android_log_logger_list* logger_list,
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struct android_log_transport_context* transp);
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int (*clear)(struct android_log_logger* logger,
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struct android_log_transport_context* transp);
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ssize_t (*setSize)(struct android_log_logger* logger,
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struct android_log_transport_context* transp, size_t size);
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ssize_t (*getSize)(struct android_log_logger* logger,
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struct android_log_transport_context* transp);
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ssize_t (*getReadableSize)(struct android_log_logger* logger,
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struct android_log_transport_context* transp);
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ssize_t (*getPrune)(struct android_log_logger_list* logger_list,
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struct android_log_transport_context* transp, char* buf,
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size_t len);
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ssize_t (*setPrune)(struct android_log_logger_list* logger_list,
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struct android_log_transport_context* transp, char* buf,
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size_t len);
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ssize_t (*getStats)(struct android_log_logger_list* logger_list,
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struct android_log_transport_context* transp, char* buf,
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size_t len);
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};
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struct android_log_transport_context {
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union android_log_context_union context; /* zero init per-transport context */
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struct android_log_transport_read* transport;
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unsigned logMask; /* mask of requested log buffers */
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int ret; /* return value associated with following data */
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struct log_msg logMsg; /* peek at upcoming data, valid if logMsg.len != 0 */
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};
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struct android_log_logger_list {
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struct listnode logger;
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android_log_transport_context transport_context;
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bool transport_initialized;
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int mode;
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unsigned int tail;
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log_time start;
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pid_t pid;
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};
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struct android_log_logger {
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struct listnode node;
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struct android_log_logger_list* parent;
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log_id_t logId;
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};
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/* assumes caller has structures read-locked, single threaded, or fenced */
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#define logger_for_each(logp, logger_list) \
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for ((logp) = node_to_item((logger_list)->logger.next, \
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struct android_log_logger, node); \
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((logp) != node_to_item(&(logger_list)->logger, \
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struct android_log_logger, node)) && \
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((logp)->parent == (logger_list)); \
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(logp) = \
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node_to_item((logp)->node.next, struct android_log_logger, node))
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/* OS specific dribs and drabs */
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#if defined(_WIN32)
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#include <private/android_filesystem_config.h>
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typedef uint32_t uid_t;
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static inline uid_t __android_log_uid() {
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return AID_SYSTEM;
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}
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#else
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static inline uid_t __android_log_uid() {
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return getuid();
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}
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#endif
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void __android_log_lock();
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int __android_log_trylock();
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void __android_log_unlock();
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__END_DECLS
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