/******************************************************************************

	COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.

	This file is part of LibMaxsi.

	LibMaxsi is free software: you can redistribute it and/or modify it under
	the terms of the GNU Lesser General Public License as published by the Free
	Software Foundation, either version 3 of the License, or (at your option)
	any later version.

	LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
	more details.

	You should have received a copy of the GNU Lesser General Public License
	along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.

	process.cpp
	Exposes system calls for process creation and management.

******************************************************************************/

#include <libmaxsi/platform.h>
#include <libmaxsi/syscall.h>
#include <libmaxsi/process.h>
#include <stdio.h>
#include <dirent.h>

namespace Maxsi
{
	namespace Process
	{
		DEFN_SYSCALL1_VOID(SysExit, SYSCALL_EXIT, int);
		DEFN_SYSCALL4(int, SysExecVE, SYSCALL_EXEC, const char*, int, char* const*, char* const*);
		DEFN_SYSCALL0(pid_t, SysFork, SYSCALL_FORK);
		DEFN_SYSCALL0(pid_t, SysGetPID, SYSCALL_GETPID);
		DEFN_SYSCALL0(pid_t, SysGetParentPID, SYSCALL_GETPPID);
		DEFN_SYSCALL3(pid_t, SysWait, SYSCALL_WAIT, pid_t, int*, int);

		int Execute(const char* filepath, int argc, const char** argv)
		{
			return SysExecVE(filepath, argc, (char* const*) argv, NULL);
		}

		void Abort()
		{
			// TODO: Send SIGABRT instead!
			Exit(128 + 6);
		}

		extern "C" void abort() { return Abort(); }

		extern "C" void _exit(int status)
		{
			SysExit(status);
		}

		DUAL_FUNCTION(void, exit, Exit, (int status))
		{
			dcloseall();
			fcloseall();
			_exit(status);
		}

		DUAL_FUNCTION(pid_t, fork, Fork, ())
		{
			return SysFork();
		}

		DUAL_FUNCTION(pid_t, getpid, GetPID, ())
		{
			return SysGetPID();
		}

		DUAL_FUNCTION(pid_t, getppid, GetParentPID, ())
		{
			return SysGetParentPID();
		}

		extern "C" pid_t waitpid(pid_t pid, int* status, int options)
		{
			return SysWait(pid, status, options);
		}

		extern "C" pid_t wait(int* status)
		{
			return waitpid(-1, status, 0);
		}
	}
}