libevent::日志

void log_callback(int severity, const char *msg)
{
    char szBuffer[512];

    FILE *pFd = fopen("./log.txt", "ab+");
    if (pFd == NULL)
        return;

    const char *severity_str;
    switch (severity)
    {
    case EVENT_LOG_DEBUG:
        severity_str = "debug";
        break;
    case EVENT_LOG_MSG:
        severity_str = "msg";
        break;
    case EVENT_LOG_WARN:
        severity_str = "warn";
        break;
    case EVENT_LOG_ERR:
        severity_str = "err";
        break;
    default:
        severity_str = "???";
        break;
    }

    snprintf(szBuffer, sizeof(szBuffer), "[%s]:%s", severity_str, msg);

    (void)fwrite(szBuffer, 1, strlen(szBuffer), pFd);

    fclose(pFd);
}


int main()
{
    //替换记录日志的默认函数
    event_set_log_callback(log_callback);
}