process.h

这是一个linux下的Shell.有命令历史和命令提示

//the information of process.
//not include pipe
struct pro_info
{
	pro_info()
	{
		init();
	};
	void init(void)
	{
		argv = 0;
		id   = -1;				//id == -1 processs has't be running. -2 run over. bigger than 0  runnnig.
		background = false;
		input_filepath = 0;
		input_fid = -1;
		output_filepath = 0;
		output_fid = -1;
		output_over_tail = false;
	};
	~pro_info()
	{		
		if(argv)
		{
			char** temp = argv;
			while(*(argv++))
				delete *argv;
			delete temp;
		}
		delete input_filepath;
		delete output_filepath;
	}
	pro_info& operator=(pro_info& x)
	{
		int num = 0;
		char** temp = x.argv;
		if(!temp)
		{
			argv = 0;
			input_filepath = 0;
			output_filepath = 0;
		}
		else
		{
			background = x.background;
			while(*(temp++))
			{
				num++;
			}
			argv = new char*[num + 1];
			argv[num] = 0;
			for(int i = 0; i < num;i++)
			{
				argv[i] = new char[strlen(x.argv[i]) + 1];
				strcpy(argv[i], x.argv[i]);
			}
			if(x.input_filepath)
			{
				input_filepath = new char[strlen(x.input_filepath) + 1];
				strcpy(input_filepath, x.input_filepath);
				input_fid = x.input_fid;
			}
			else
				input_filepath = 0;
			
			if(x.output_filepath)
			{
				output_filepath = new char[strlen(x.output_filepath) + 1];
				strcpy(output_filepath, x.output_filepath);
				output_fid = x.output_fid;
				output_over_tail = x.output_over_tail;
			}
			else
				output_filepath = 0;
			
		}
		return x;
	}
	char**  argv;
	int     id;
	bool    background;
	char*   input_filepath;
	int     input_fid;
	char*   output_filepath;
	int     output_fid;
    bool    output_over_tail;
};

struct process_node
{
	process_node()
	{
		pro.init();
		next = 0;
		pipe_read = pipe_write = -1;
		readFlag = false;
		writeFlag = false;
	};
	~process_node()
	{
	}
	pro_info pro;
	process_node* next;
	int pipe_read;
	int pipe_write;
	bool readFlag;
	bool writeFlag;
};