Merge "logd: allow opting into simple or serialized log buffers" am: ed99870f am: c89430bd

log.tag.<tag>             string persist The <tag> specific logging level.

persist.log.tag.<tag>      string build  default for log.tag.<tag>

logd.buffer_type           string (empty) Set the log buffer type.  Current choices are 'simple',

                                          'chatty', or 'serialized'.  Defaults to 'chatty' if empty.

NB:

- auto - managed by /init

- bool+ - "true", "false" and comma separated list of "eng" (forced false if

#include <android-base/logging.h>

#include <android-base/macros.h>

#include <android-base/properties.h>

#include <android-base/stringprintf.h>

#include <cutils/android_get_control_file.h>

#include <cutils/sockets.h>

#include "SerializedLogBuffer.h"

#include "SimpleLogBuffer.h"

using android::base::GetProperty;

#define KMSG_PRIORITY(PRI)                                 \

    '<', '0' + LOG_MAKEPRI(LOG_DAEMON, LOG_PRI(PRI)) / 10, \

        '0' + LOG_MAKEPRI(LOG_DAEMON, LOG_PRI(PRI)) % 10, '>'

    // Pruning configuration.

    PruneList prune_list;

    std::string buffer_type = GetProperty("logd.buffer_type", "chatty");

    // Partial (required for chatty) or full logging statistics.

    bool enable_full_log_statistics = __android_logger_property_get_bool(

            "logd.statistics", BOOL_DEFAULT_TRUE | BOOL_DEFAULT_FLAG_PERSIST |

                                       BOOL_DEFAULT_FLAG_ENG | BOOL_DEFAULT_FLAG_SVELTE);

    LogStatistics log_statistics(enable_full_log_statistics, false);

    LogStatistics log_statistics(enable_full_log_statistics, buffer_type == "serialized");

    // Serves the purpose of managing the last logs times read on a

    // socket connection, and as a reader lock on a range of log

    // entries.

    // Serves the purpose of managing the last logs times read on a socket connection, and as a

    // reader lock on a range of log entries.

    LogReaderList reader_list;

    // LogBuffer is the object which is responsible for holding all log entries.

    LogBuffer* logBuf;

    if (true) {

        logBuf = new ChattyLogBuffer(&reader_list, &log_tags, &prune_list, &log_statistics);

    LogBuffer* log_buffer = nullptr;

    if (buffer_type == "chatty") {

        log_buffer = new ChattyLogBuffer(&reader_list, &log_tags, &prune_list, &log_statistics);

    } else if (buffer_type == "serialized") {

        log_buffer = new SerializedLogBuffer(&reader_list, &log_tags, &log_statistics);

    } else if (buffer_type == "simple") {

        log_buffer = new SimpleLogBuffer(&reader_list, &log_tags, &log_statistics);

    } else {

        logBuf = new SimpleLogBuffer(&reader_list, &log_tags, &log_statistics);

        LOG(FATAL) << "buffer_type must be one of 'chatty', 'serialized', or 'simple'";

    }

    // LogReader listens on /dev/socket/logdr. When a client

    // connects, log entries in the LogBuffer are written to the client.

    LogReader* reader = new LogReader(logBuf, &reader_list);

    LogReader* reader = new LogReader(log_buffer, &reader_list);

    if (reader->startListener()) {

        return EXIT_FAILURE;

    }

    // LogListener listens on /dev/socket/logdw for client

    // initiated log messages. New log entries are added to LogBuffer

    // and LogReader is notified to send updates to connected clients.

    LogListener* swl = new LogListener(logBuf);

    LogListener* swl = new LogListener(log_buffer);

    if (!swl->StartListener()) {

        return EXIT_FAILURE;

    }

    // Command listener listens on /dev/socket/logd for incoming logd

    // administrative commands.

    CommandListener* cl = new CommandListener(logBuf, &log_tags, &prune_list, &log_statistics);

    CommandListener* cl = new CommandListener(log_buffer, &log_tags, &prune_list, &log_statistics);

    if (cl->startListener()) {

        return EXIT_FAILURE;

    }

        int dmesg_fd = __android_logger_property_get_bool("ro.logd.auditd.dmesg", BOOL_DEFAULT_TRUE)

                               ? fdDmesg

                               : -1;

        al = new LogAudit(logBuf, dmesg_fd, &log_statistics);

        al = new LogAudit(log_buffer, dmesg_fd, &log_statistics);

    }

    LogKlog* kl = nullptr;

    if (klogd) {

        kl = new LogKlog(logBuf, fdDmesg, fdPmesg, al != nullptr, &log_statistics);

        kl = new LogKlog(log_buffer, fdDmesg, fdPmesg, al != nullptr, &log_statistics);

    }

    readDmesg(al, kl);