Cosmos::Support::Command Namespace Reference

Functions
int32_t	Shell (string command_line, string outpath, string inpath, string errpath)

Function Documentation

int32_t Cosmos::Support::Command::Shell	(	string	command_line,
		string	outpath,
		string	inpath,
		string	errpath
	)

            {
                int32_t iretn=0;
                int devin, devout, deverr;
                int prev_stdin, prev_stdout, prev_stderr;

                if (command_line.empty())
                {
                    return GENERAL_ERROR_EMPTY;
                }

                if (outpath.empty())
                {
                    devout = dup(STDOUT_FILENO);
                }
                else
                {
                    devout = open(outpath.c_str(), O_CREAT|O_WRONLY|O_APPEND, 00666);
                }
                // Redirect.
                prev_stdout = dup(STDOUT_FILENO);
                dup2(devout, STDOUT_FILENO);
                close(devout);

                if (inpath.empty())
                {
                    devin = open("/dev/null", O_RDWR);
                }
                else
                {
                    devin = open(inpath.c_str(), O_RDONLY, 00666);
                }
                prev_stdin = dup(STDIN_FILENO);
                dup2(devin, STDIN_FILENO);
                close(devin);

                prev_stderr = dup(STDERR_FILENO);
                if (errpath.empty())
                {
                    deverr = devout;
                }
                else
                {
                    deverr = open(errpath.c_str(), O_CREAT|O_WRONLY|O_APPEND, 00666);
                }
                dup2(deverr, STDERR_FILENO);
                close(deverr);

                // Execute the command.
                iretn = system(command_line.c_str());

                // Reset standard file handles
                dup2(prev_stdin, STDIN_FILENO);
                dup2(prev_stdout, STDOUT_FILENO);
                dup2(prev_stderr, STDERR_FILENO);
                close(prev_stdin);
                close(prev_stdout);
                close(prev_stderr);

                return iretn;
            }