blob: 50d1cb441d8368d59c6dc53974fb7d3716f4c380 [file] [log] [blame]
/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _LIBLOG_LOGGER_H__
#define _LIBLOG_LOGGER_H__
#include <stdatomic.h>
#include <stdbool.h>
#include <cutils/list.h>
#include <log/log.h>
#include <log/uio.h>
#include "log_portability.h"
__BEGIN_DECLS
/* Union, sock or fd of zero is not allowed unless static initialized */
union android_log_context {
void *private;
atomic_int sock;
atomic_int fd;
struct listnode *node;
atomic_uintptr_t atomic_pointer;
};
struct android_log_transport_write {
struct listnode node;
const char *name;
unsigned logMask; /* cache of available success */
union android_log_context context; /* Initialized by static allocation */
int (*available)(log_id_t logId);
int (*open)();
void (*close)();
int (*write)(log_id_t logId, struct timespec *ts, struct iovec *vec, size_t nr);
};
struct android_log_logger_list;
struct android_log_transport_context;
struct android_log_logger;
struct android_log_transport_read {
struct listnode node;
const char *name;
int (*available)(log_id_t logId);
int (*version)(struct android_log_logger *logger,
struct android_log_transport_context *transp);
void (*close)(struct android_log_logger_list *logger_list,
struct android_log_transport_context *transp);
/*
* Expect all to instantiate open on any call, so we do not have
* an expicit open call
*/
int (*read)(struct android_log_logger_list *logger_list,
struct android_log_transport_context *transp,
struct log_msg *log_msg);
/* Assumption is only called if not ANDROID_LOG_NONBLOCK */
int (*poll)(struct android_log_logger_list *logger_list,
struct android_log_transport_context *transp);
int (*clear)(struct android_log_logger *logger,
struct android_log_transport_context *transp);
ssize_t (*setSize)(struct android_log_logger *logger,
struct android_log_transport_context *transp,
size_t size);
ssize_t (*getSize)(struct android_log_logger *logger,
struct android_log_transport_context *transp);
ssize_t (*getReadableSize)(struct android_log_logger *logger,
struct android_log_transport_context *transp);
ssize_t (*getPrune)(struct android_log_logger_list *logger_list,
struct android_log_transport_context *transp,
char *buf, size_t len);
ssize_t (*setPrune)(struct android_log_logger_list *logger_list,
struct android_log_transport_context *transp,
char *buf, size_t len);
ssize_t (*getStats)(struct android_log_logger_list *logger_list,
struct android_log_transport_context *transp,
char *buf, size_t len);
};
struct android_log_logger_list {
struct listnode logger;
struct listnode transport;
int mode;
unsigned int tail;
log_time start;
pid_t pid;
};
struct android_log_logger {
struct listnode node;
struct android_log_logger_list *parent;
log_id_t logId;
};
struct android_log_transport_context {
struct listnode node;
union android_log_context context; /* zero init per-transport context */
struct android_log_logger_list *parent;
struct android_log_transport_read *transport;
unsigned logMask;
int ret;
struct log_msg logMsg; /* valid is logMsg.len != 0 */
};
/* assumes caller has structures read-locked, single threaded, or fenced */
#define transport_context_for_each(transp, logger_list) \
for ((transp) = node_to_item((logger_list)->transport.next, \
struct android_log_transport_context, \
node); \
((transp) != node_to_item(&(logger_list)->transport, \
struct android_log_transport_context, \
node)) && \
((transp)->parent == (logger_list)); \
(transp) = node_to_item((transp)->node.next, \
struct android_log_transport_context, node))
#define logger_for_each(logp, logger_list) \
for ((logp) = node_to_item((logger_list)->logger.next, \
struct android_log_logger, node); \
((logp) != node_to_item(&(logger_list)->logger, \
struct android_log_logger, node)) && \
((logp)->parent == (logger_list)); \
(logp) = node_to_item((logp)->node.next, \
struct android_log_logger, node))
/* OS specific dribs and drabs */
#if defined(_WIN32)
#include <private/android_filesystem_config.h>
typedef uint32_t uid_t;
static inline uid_t __android_log_uid() { return AID_SYSTEM; }
#else
static inline uid_t __android_log_uid() { return getuid(); }
#endif
LIBLOG_HIDDEN void __android_log_lock();
LIBLOG_HIDDEN int __android_log_trylock();
LIBLOG_HIDDEN void __android_log_unlock();
__END_DECLS
#endif /* _LIBLOG_LOGGER_H__ */