
...
     */
    int startExec(const std::string &cmd, const std::vector<std::string>& args, 
          bool has_input, bool has_output);
    int send(const std::string& data);
    int receive(std::string& data, int cnt = -1);
    int getline(std::string& data, int timeosecs = -1);
    int wait();
    /** Wait with WNOHANG set. 
    @return true if process exited, false else.
    @param O: status, the wait(2) call's status value */
    bool maybereap(int *status);

	a/src/execmd.h		b/src/execmd.h
	...		...
136	*/	136	*/
137	int startExec(const std::string &cmd, const std::vector<std::string>& args,	137	int startExec(const std::string &cmd, const std::vector<std::string>& args,
138	bool has_input, bool has_output);	138	bool has_input, bool has_output);
139	int send(const std::string& data);	139	int send(const std::string& data);
140	int receive(std::string& data, int cnt = -1);	140	int receive(std::string& data, int cnt = -1);
141	int getline(std::string& data);	141	int getline(std::string& data, int timeosecs = -1);
142	int wait();	142	int wait();
143	/** Wait with WNOHANG set.	143	/** Wait with WNOHANG set.
144	@return true if process exited, false else.	144	@return true if process exited, false else.
145	@param O: status, the wait(2) call's status value */	145	@param O: status, the wait(2) call's status value */
146	bool maybereap(int *status);	146	bool maybereap(int *status);