source: mainline/uspace/srv/logger/writer.c@ 924786bf

/*
 * Copyright (c) 2012 Vojtech Horky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @defgroup logger Logging service.
 * @brief HelenOS logging service.
 * @{
 */

/** @file
 */

#include <ipc/services.h>
#include <ipc/logger.h>
#include <io/log.h>
#include <io/logctl.h>
#include <io/klog.h>
#include <ns.h>
#include <async.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <str_error.h>
#include "logger.h"


static logger_log_t *handle_create_log(sysarg_t parent)
{
        void *name;
        errno_t rc = async_data_write_accept(&name, true, 1, 0, 0, NULL);
        if (rc != EOK)
                return NULL;

        logger_log_t *log = find_or_create_log_and_lock(name, parent);

        free(name);

        return log;
}

static errno_t handle_receive_message(sysarg_t log_id, sysarg_t level)
{
        logger_log_t *log = find_log_by_id_and_lock(log_id);
        if (log == NULL)
                return ENOENT;

        void *message = NULL;
        errno_t rc = async_data_write_accept(&message, true, 1, 0, 0, NULL);
        if (rc != EOK)
                goto leave;

        if (!shall_log_message(log, level)) {
                rc = EOK;
                goto leave;
        }

        KLOG_PRINTF(level, "[%s] %s: %s",
            log->full_name, log_level_str(level),
            (const char *) message);
        write_to_log(log, level, message);

        rc = EOK;

leave:
        log_unlock(log);
        free(message);

        return rc;
}

void logger_connection_handler_writer(cap_call_handle_t chandle)
{
        logger_log_t *log;
        errno_t rc;

        /* Acknowledge the connection. */
        async_answer_0(chandle, EOK);

        logger_log("writer: new client.\n");

        logger_registered_logs_t registered_logs;
        registered_logs_init(&registered_logs);

        while (true) {
                ipc_call_t call;
                cap_call_handle_t chandle = async_get_call(&call);

                if (!IPC_GET_IMETHOD(call))
                        break;

                switch (IPC_GET_IMETHOD(call)) {
                case LOGGER_WRITER_CREATE_LOG:
                        log = handle_create_log(IPC_GET_ARG1(call));
                        if (log == NULL) {
                                async_answer_0(chandle, ENOMEM);
                                break;
                        }
                        if (!register_log(&registered_logs, log)) {
                                log_unlock(log);
                                async_answer_0(chandle, ELIMIT);
                                break;
                        }
                        log_unlock(log);
                        async_answer_1(chandle, EOK, (sysarg_t) log);
                        break;
                case LOGGER_WRITER_MESSAGE:
                        rc = handle_receive_message(IPC_GET_ARG1(call),
                            IPC_GET_ARG2(call));
                        async_answer_0(chandle, rc);
                        break;
                default:
                        async_answer_0(chandle, EINVAL);
                        break;
                }
        }

        unregister_logs(&registered_logs);
        logger_log("writer: client terminated.\n");
}


/**
 * @}
 */