The Dlog API provides functions for sending log output.

Required Header

#include <dlog.h>

Overview

Sending log message to circular buffer. dlog APIs include Priority and Tag. By using priority and Tag, we can easily filtered messages what we want to see.

priority

priority level indicates the urgency of log message

Macro example for useful usage

The dlog APIs can be used by defining own macros. The macros can be defined like below examples. Thus, developers can use appropriate method as a matter of convenience.

#undef LOG_TAG
#define LOG_TAG "APP_TAG"

#define LOGI(fmt, arg...) \
    ({ do { \
        dlog_print(DLOG_INFO, LOG_TAG, "%s: %s(%d) > " fmt, __MODULE__, __func__, __LINE__, ##arg); \
    } while (0); })
#define LOGW(fmt, arg...) \
    ({ do { \
        dlog_print(DLOG_WARN, LOG_TAG, "%s: %s(%d) > " fmt, __MODULE__, __func__, __LINE__, ##arg); \
    } while (0); })
#define LOGE(fmt, arg...) \
    ({ do { \
        dlog_print(DLOG_ERROR, LOG_TAG, "%s: %s(%d) > " fmt, __MODULE__, __func__, __LINE__, ##arg); \
    } while (0); })

dlogutil

Introduction

You can use dlogutil command to view and follow the contents of the log buffers. The general usage is :

dlogutil [<option>] ... [<filter-spec>] ...

Filtering log output

Every log message has a tag and a priority associated with it. Filter expression follows this format tag:priority where tag indicates the tag of interest and priority indicates the minimum level of priority to report for that tag. You can add any number of tag:priority specifications in a single filter expression. The tag of a log message is a short indicating the system component from which the message originates The priority is one of the following character values, orderd from lowest to highest priority:
D - debug
I - info
W - warning
E - Error

for example, if you want to see MY_APP tag and above of debug priority,

# dlogutil MY_APP:D

if you want to see all log message above of info priority.

# dlogutil *:I

List of logutil command options

>>>>>>> mobile

Enumeration Type Documentation

Function Documentation

#include<dlog.h>
int main(void)
{
    int integer = 21;
    char string[] = "test dlog";

    dlog_print(DLOG_INFO, "USR_TAG", "test dlog");
    dlog_print(DLOG_INFO, "USR_TAG", "%s, %d", string, integer);
    return 0;
}

#include<dlog.h>
void my_debug_print(char *format, ...)
{
    va_list ap;

    va_start(ap, format);
    dlog_vprint(DLOG_INFO, "USR_TAG", format, ap);
    va_end(ap);
}

int main(void)
{
    my_debug_print("%s", "test dlog");
    my_debug_print("%s, %d", "test dlog", 21);
    return 0;
}