liblog: convert to C++
Bug: 119867234
Test: liblog, logcat, logd unit tests
Change-Id: I2a33b6fc37f9860c0041e3573bfb59ea389f623c
diff --git a/liblog/logger_read.cpp b/liblog/logger_read.cpp
new file mode 100644
index 0000000..e429c36
--- /dev/null
+++ b/liblog/logger_read.cpp
@@ -0,0 +1,467 @@
+/*
+** Copyright 2013-2014, 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.
+*/
+
+#include "log/log_read.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <sched.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <android/log.h>
+#include <cutils/list.h>
+#include <private/android_filesystem_config.h>
+
+#include "config_read.h"
+#include "log_portability.h"
+#include "logger.h"
+
+/* android_logger_alloc unimplemented, no use case */
+/* android_logger_free not exported */
+static void android_logger_free(struct logger* logger) {
+ struct android_log_logger* logger_internal = (struct android_log_logger*)logger;
+
+ if (!logger_internal) {
+ return;
+ }
+
+ list_remove(&logger_internal->node);
+
+ free(logger_internal);
+}
+
+/* android_logger_alloc unimplemented, no use case */
+
+/* method for getting the associated sublog id */
+LIBLOG_ABI_PUBLIC log_id_t android_logger_get_id(struct logger* logger) {
+ return ((struct android_log_logger*)logger)->logId;
+}
+
+static int init_transport_context(struct android_log_logger_list* logger_list) {
+ struct android_log_transport_read* transport;
+ struct listnode* node;
+
+ if (!logger_list) {
+ return -EINVAL;
+ }
+
+ if (list_empty(&logger_list->logger)) {
+ return -EINVAL;
+ }
+
+ if (!list_empty(&logger_list->transport)) {
+ return 0;
+ }
+
+ __android_log_lock();
+ /* mini __write_to_log_initialize() to populate transports */
+ if (list_empty(&__android_log_transport_read) && list_empty(&__android_log_persist_read)) {
+ __android_log_config_read();
+ }
+ __android_log_unlock();
+
+ node = (logger_list->mode & ANDROID_LOG_PSTORE) ? &__android_log_persist_read
+ : &__android_log_transport_read;
+
+ read_transport_for_each(transport, node) {
+ struct android_log_transport_context* transp;
+ struct android_log_logger* logger;
+ unsigned logMask = 0;
+
+ logger_for_each(logger, logger_list) {
+ log_id_t logId = logger->logId;
+
+ if ((logId == LOG_ID_SECURITY) && (__android_log_uid() != AID_SYSTEM)) {
+ continue;
+ }
+ if (transport->read && (!transport->available || (transport->available(logId) >= 0))) {
+ logMask |= 1 << logId;
+ }
+ }
+ if (!logMask) {
+ continue;
+ }
+ transp = static_cast<android_log_transport_context*>(calloc(1, sizeof(*transp)));
+ if (!transp) {
+ return -ENOMEM;
+ }
+ transp->parent = logger_list;
+ transp->transport = transport;
+ transp->logMask = logMask;
+ transp->ret = 1;
+ list_add_tail(&logger_list->transport, &transp->node);
+ }
+ if (list_empty(&logger_list->transport)) {
+ return -ENODEV;
+ }
+ return 0;
+}
+
+#define LOGGER_FUNCTION(logger, def, func, args...) \
+ ssize_t ret = -EINVAL; \
+ struct android_log_transport_context* transp; \
+ struct android_log_logger* logger_internal = (struct android_log_logger*)(logger); \
+ \
+ if (!logger_internal) { \
+ return ret; \
+ } \
+ ret = init_transport_context(logger_internal->parent); \
+ if (ret < 0) { \
+ return ret; \
+ } \
+ \
+ ret = (def); \
+ transport_context_for_each(transp, logger_internal->parent) { \
+ if ((transp->logMask & (1 << logger_internal->logId)) && transp->transport && \
+ transp->transport->func) { \
+ ssize_t retval = (transp->transport->func)(logger_internal, transp, ##args); \
+ if ((ret >= 0) || (ret == (def))) { \
+ ret = retval; \
+ } \
+ } \
+ } \
+ return ret
+
+LIBLOG_ABI_PUBLIC int android_logger_clear(struct logger* logger) {
+ LOGGER_FUNCTION(logger, -ENODEV, clear);
+}
+
+/* returns the total size of the log's ring buffer */
+LIBLOG_ABI_PUBLIC long android_logger_get_log_size(struct logger* logger) {
+ LOGGER_FUNCTION(logger, -ENODEV, getSize);
+}
+
+LIBLOG_ABI_PUBLIC int android_logger_set_log_size(struct logger* logger, unsigned long size) {
+ LOGGER_FUNCTION(logger, -ENODEV, setSize, size);
+}
+
+/*
+ * returns the readable size of the log's ring buffer (that is, amount of the
+ * log consumed)
+ */
+LIBLOG_ABI_PUBLIC long android_logger_get_log_readable_size(struct logger* logger) {
+ LOGGER_FUNCTION(logger, -ENODEV, getReadableSize);
+}
+
+/*
+ * returns the logger version
+ */
+LIBLOG_ABI_PUBLIC int android_logger_get_log_version(struct logger* logger) {
+ LOGGER_FUNCTION(logger, 4, version);
+}
+
+#define LOGGER_LIST_FUNCTION(logger_list, def, func, args...) \
+ struct android_log_transport_context* transp; \
+ struct android_log_logger_list* logger_list_internal = \
+ (struct android_log_logger_list*)(logger_list); \
+ \
+ ssize_t ret = init_transport_context(logger_list_internal); \
+ if (ret < 0) { \
+ return ret; \
+ } \
+ \
+ ret = (def); \
+ transport_context_for_each(transp, logger_list_internal) { \
+ if (transp->transport && (transp->transport->func)) { \
+ ssize_t retval = (transp->transport->func)(logger_list_internal, transp, ##args); \
+ if ((ret >= 0) || (ret == (def))) { \
+ ret = retval; \
+ } \
+ } \
+ } \
+ return ret
+
+/*
+ * returns statistics
+ */
+LIBLOG_ABI_PUBLIC ssize_t android_logger_get_statistics(struct logger_list* logger_list, char* buf,
+ size_t len) {
+ LOGGER_LIST_FUNCTION(logger_list, -ENODEV, getStats, buf, len);
+}
+
+LIBLOG_ABI_PUBLIC ssize_t android_logger_get_prune_list(struct logger_list* logger_list, char* buf,
+ size_t len) {
+ LOGGER_LIST_FUNCTION(logger_list, -ENODEV, getPrune, buf, len);
+}
+
+LIBLOG_ABI_PUBLIC int android_logger_set_prune_list(struct logger_list* logger_list, char* buf,
+ size_t len) {
+ LOGGER_LIST_FUNCTION(logger_list, -ENODEV, setPrune, buf, len);
+}
+
+LIBLOG_ABI_PUBLIC struct logger_list* android_logger_list_alloc(int mode, unsigned int tail,
+ pid_t pid) {
+ struct android_log_logger_list* logger_list;
+
+ logger_list = static_cast<android_log_logger_list*>(calloc(1, sizeof(*logger_list)));
+ if (!logger_list) {
+ return NULL;
+ }
+
+ list_init(&logger_list->logger);
+ list_init(&logger_list->transport);
+ logger_list->mode = mode;
+ logger_list->tail = tail;
+ logger_list->pid = pid;
+
+ return (struct logger_list*)logger_list;
+}
+
+LIBLOG_ABI_PUBLIC struct logger_list* android_logger_list_alloc_time(int mode, log_time start,
+ pid_t pid) {
+ struct android_log_logger_list* logger_list;
+
+ logger_list = static_cast<android_log_logger_list*>(calloc(1, sizeof(*logger_list)));
+ if (!logger_list) {
+ return NULL;
+ }
+
+ list_init(&logger_list->logger);
+ list_init(&logger_list->transport);
+ logger_list->mode = mode;
+ logger_list->start = start;
+ logger_list->pid = pid;
+
+ return (struct logger_list*)logger_list;
+}
+
+/* android_logger_list_register unimplemented, no use case */
+/* android_logger_list_unregister unimplemented, no use case */
+
+/* Open the named log and add it to the logger list */
+LIBLOG_ABI_PUBLIC struct logger* android_logger_open(struct logger_list* logger_list,
+ log_id_t logId) {
+ struct android_log_logger_list* logger_list_internal =
+ (struct android_log_logger_list*)logger_list;
+ struct android_log_logger* logger;
+
+ if (!logger_list_internal || (logId >= LOG_ID_MAX)) {
+ goto err;
+ }
+
+ logger_for_each(logger, logger_list_internal) {
+ if (logger->logId == logId) {
+ goto ok;
+ }
+ }
+
+ logger = static_cast<android_log_logger*>(calloc(1, sizeof(*logger)));
+ if (!logger) {
+ goto err;
+ }
+
+ logger->logId = logId;
+ list_add_tail(&logger_list_internal->logger, &logger->node);
+ logger->parent = logger_list_internal;
+
+ /* Reset known transports to re-evaluate, we just added one */
+ while (!list_empty(&logger_list_internal->transport)) {
+ struct listnode* node = list_head(&logger_list_internal->transport);
+ struct android_log_transport_context* transp =
+ node_to_item(node, struct android_log_transport_context, node);
+
+ list_remove(&transp->node);
+ free(transp);
+ }
+ goto ok;
+
+err:
+ logger = NULL;
+ok:
+ return (struct logger*)logger;
+}
+
+/* Open the single named log and make it part of a new logger list */
+LIBLOG_ABI_PUBLIC struct logger_list* android_logger_list_open(log_id_t logId, int mode,
+ unsigned int tail, pid_t pid) {
+ struct logger_list* logger_list = android_logger_list_alloc(mode, tail, pid);
+
+ if (!logger_list) {
+ return NULL;
+ }
+
+ if (!android_logger_open(logger_list, logId)) {
+ android_logger_list_free(logger_list);
+ return NULL;
+ }
+
+ return logger_list;
+}
+
+/* Validate log_msg packet, read function has already been null checked */
+static int android_transport_read(struct android_log_logger_list* logger_list,
+ struct android_log_transport_context* transp,
+ struct log_msg* log_msg) {
+ int ret = (*transp->transport->read)(logger_list, transp, log_msg);
+
+ if (ret > (int)sizeof(*log_msg)) {
+ ret = sizeof(*log_msg);
+ }
+
+ transp->ret = ret;
+
+ /* propagate errors, or make sure len & hdr_size members visible */
+ if (ret < (int)(sizeof(log_msg->entry.len) + sizeof(log_msg->entry.hdr_size))) {
+ if (ret >= (int)sizeof(log_msg->entry.len)) {
+ log_msg->entry.len = 0;
+ }
+ return ret;
+ }
+
+ /* hdr_size correction (logger_entry -> logger_entry_v2+ conversion) */
+ if (log_msg->entry_v2.hdr_size == 0) {
+ log_msg->entry_v2.hdr_size = sizeof(struct logger_entry);
+ }
+ if ((log_msg->entry_v2.hdr_size < sizeof(log_msg->entry_v1)) ||
+ (log_msg->entry_v2.hdr_size > sizeof(log_msg->entry))) {
+ return -EINVAL;
+ }
+
+ /* len validation */
+ if (ret <= log_msg->entry_v2.hdr_size) {
+ log_msg->entry.len = 0;
+ } else {
+ log_msg->entry.len = ret - log_msg->entry_v2.hdr_size;
+ }
+
+ return ret;
+}
+
+/* Read from the selected logs */
+LIBLOG_ABI_PUBLIC int android_logger_list_read(struct logger_list* logger_list,
+ struct log_msg* log_msg) {
+ struct android_log_transport_context* transp;
+ struct android_log_logger_list* logger_list_internal =
+ (struct android_log_logger_list*)logger_list;
+
+ int ret = init_transport_context(logger_list_internal);
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* at least one transport */
+ transp = node_to_item(logger_list_internal->transport.next, struct android_log_transport_context,
+ node);
+
+ /* more than one transport? */
+ if (transp->node.next != &logger_list_internal->transport) {
+ /* Poll and merge sort the entries if from multiple transports */
+ struct android_log_transport_context* oldest = NULL;
+ int ret;
+ int polled = 0;
+ do {
+ if (polled) {
+ sched_yield();
+ }
+ ret = -1000;
+ polled = 0;
+ do {
+ int retval = transp->ret;
+ if ((retval > 0) && !transp->logMsg.entry.len) {
+ if (!transp->transport->read) {
+ retval = transp->ret = 0;
+ } else if ((logger_list_internal->mode & ANDROID_LOG_NONBLOCK) ||
+ !transp->transport->poll) {
+ retval = android_transport_read(logger_list_internal, transp, &transp->logMsg);
+ } else {
+ int pollval = (*transp->transport->poll)(logger_list_internal, transp);
+ if (pollval <= 0) {
+ sched_yield();
+ pollval = (*transp->transport->poll)(logger_list_internal, transp);
+ }
+ polled = 1;
+ if (pollval < 0) {
+ if ((pollval == -EINTR) || (pollval == -EAGAIN)) {
+ return -EAGAIN;
+ }
+ retval = transp->ret = pollval;
+ } else if (pollval > 0) {
+ retval = android_transport_read(logger_list_internal, transp, &transp->logMsg);
+ }
+ }
+ }
+ if (ret < retval) {
+ ret = retval;
+ }
+ if ((transp->ret > 0) && transp->logMsg.entry.len &&
+ (!oldest || (oldest->logMsg.entry.sec > transp->logMsg.entry.sec) ||
+ ((oldest->logMsg.entry.sec == transp->logMsg.entry.sec) &&
+ (oldest->logMsg.entry.nsec > transp->logMsg.entry.nsec)))) {
+ oldest = transp;
+ }
+ transp = node_to_item(transp->node.next, struct android_log_transport_context, node);
+ } while (transp != node_to_item(&logger_list_internal->transport,
+ struct android_log_transport_context, node));
+ if (!oldest && (logger_list_internal->mode & ANDROID_LOG_NONBLOCK)) {
+ return (ret < 0) ? ret : -EAGAIN;
+ }
+ transp = node_to_item(logger_list_internal->transport.next,
+ struct android_log_transport_context, node);
+ } while (!oldest && (ret > 0));
+ if (!oldest) {
+ return ret;
+ }
+ // ret is a positive value less than sizeof(struct log_msg)
+ ret = oldest->ret;
+ if (ret < oldest->logMsg.entry.hdr_size) {
+ // zero truncated header fields.
+ memset(
+ log_msg, 0,
+ (oldest->logMsg.entry.hdr_size > sizeof(oldest->logMsg) ? sizeof(oldest->logMsg)
+ : oldest->logMsg.entry.hdr_size));
+ }
+ memcpy(log_msg, &oldest->logMsg, ret);
+ oldest->logMsg.entry.len = 0; /* Mark it as copied */
+ return ret;
+ }
+
+ /* if only one, no need to copy into transport_context and merge-sort */
+ return android_transport_read(logger_list_internal, transp, log_msg);
+}
+
+/* Close all the logs */
+LIBLOG_ABI_PUBLIC void android_logger_list_free(struct logger_list* logger_list) {
+ struct android_log_logger_list* logger_list_internal =
+ (struct android_log_logger_list*)logger_list;
+
+ if (logger_list_internal == NULL) {
+ return;
+ }
+
+ while (!list_empty(&logger_list_internal->transport)) {
+ struct listnode* node = list_head(&logger_list_internal->transport);
+ struct android_log_transport_context* transp =
+ node_to_item(node, struct android_log_transport_context, node);
+
+ if (transp->transport && transp->transport->close) {
+ (*transp->transport->close)(logger_list_internal, transp);
+ }
+ list_remove(&transp->node);
+ free(transp);
+ }
+
+ while (!list_empty(&logger_list_internal->logger)) {
+ struct listnode* node = list_head(&logger_list_internal->logger);
+ struct android_log_logger* logger = node_to_item(node, struct android_log_logger, node);
+ android_logger_free((struct logger*)logger);
+ }
+
+ free(logger_list_internal);
+}