log日志写法

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#define LOG_FILE                            "./log.txt"#define MAX_LOG_SIZE                        20971520      //20M#define G_LOG(fmt, ...)                     g_mylog(__FILE__, __LINE__, __FUNCTION__,  fmt, ##__VA_ARGS__)      //LOG日志宏定义//声明gint g_mylog (const gchar* file, gint line, const gchar* function, gchar* fmt, ...);//实现gint g_mylog (const gchar* file, gint line, const gchar* function, gchar* fmt, ...){    va_list arg;    char    pre[128], tmp[1024];    long    clock;    struct  tm *c_ptr;    FILE    *fp;    struct  stat statbuff;    time( &clock );    c_ptr = localtime(&clock);    sprintf(pre, "[%04d-%02d-%02d %02d:%02d:%02d][%s:%d:%s()]",         c_ptr->tm_year+1900, c_ptr->tm_mon+1, c_ptr->tm_mday,         c_ptr->tm_hour, c_ptr->tm_min, c_ptr->tm_sec, file, line , function);    va_start(arg, fmt);    vsprintf(tmp, fmt, arg);    va_end (arg);    if(!(fp = fopen(LOG_FILE, "at")))   //以追加方式打开文件，不存在则创建        return -1;    fprintf(fp, "%s %s\n", pre, tmp);    fstat(fileno(fp), &statbuff);    if (statbuff.st_size > MAX_LOG_SIZE)    //如果文件超过规定大小，则保存为back文件    {        char path[1024];        fclose(fp);        sprintf(path,"cp %s %s_bak", LOG_FILE, LOG_FILE);        system(path);        sprintf(path,"rm %s", LOG_FILE);        system(path);    }    else    {        fclose(fp);    }    return 0;}

//用法
G_LOG("test1, %d", 8899);
G_LOG("test2");

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