//------------------------------------------------------------------------------
// <copyright file="LqrSMACPOpen2.cpp" company="LiquidRobotics">
//
// Copyright (c) 2014 Liquid Robotics, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
// This software is associated with a release.  Liquid Robotics makes no
// representation that the design, interfaces or component distribution will
// remain unchanged in future releases.
//
// </copyright>
//
// <summary>
//   Implementation of POpen2, which opens a process and provides access to the
//   input and output pipes and the process ID.
// </summary>
//
// <owner>Mike Cookson</owner>
//------------------------------------------------------------------------------

#include <stdio.h>
#include "LqrSMACPOpen2.h"
#include "LqrSMACPipes.h"

using namespace std;

namespace LiquidRobotics {
namespace SMACFramework {

POpen2ProcessInfo POpen2(const string& command, bool outputEqualsError)
{
	const int IN = 0;
	const int OUT = 1;
	const int ERR = 2;
	POpen2ProcessInfo result;
	Pipes inPipes(false);
	Pipes outPipes(false);
	Pipes errPipes(false);

	try
	{
		inPipes.Create();
		outPipes.Create();

		if (!outputEqualsError)
			errPipes.Create();
	}
	catch(...)
	{
		return result;
	}

	result.pid = fork();

	if (result.pid == 0)
	{
		dup2(inPipes.ReadPipe(), IN);
		dup2(outPipes.WritePipe(), OUT);

		if (outputEqualsError)
			dup2(outPipes.WritePipe(), ERR);
		else
			dup2(errPipes.WritePipe(), ERR);

		inPipes.Close();
		outPipes.Close();
		errPipes.Close();

		execl("/bin/sh", "sh", "-c", command.c_str(), NULL);
		perror("execl");
		exit(1);
	}
	else if (result.pid > 0)
	{
		result.infd = dup(inPipes.WritePipe());
		result.outfd = dup(outPipes.ReadPipe());

		if (!outputEqualsError)
			result.errfd = dup(errPipes.ReadPipe());
	}

	return result;
}

}
}
