stat用法

判断某个文件是否存在，可以用此接口.

bool file_exists(const char *path)
{
	struct stat buffer;
	int ret = stat(path, &buffer);
	return (ret == 0);
}

系统调用删除某个文件

char runscript[128] = {};
sprintf(runscript, "%s%s", "rm -rf  ", filename);
system(runscript);
system('sync')