/*

* Copyright (c) 2009-2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

#include <unistd.h>

#include "process.h"

#include "buffer.h"

#include <stdlib.h>

#include <string.h>

#include <poll.h>

#include <signal.h>

#include <errno.h>

#include <sys/wait.h>

#include "log.h"

proc *process_new(void)

{

	proc *p = malloc(sizeof(proc));

	p->output = buffer_new();

	if (!p->output)

	{

		free(p);

		return  NULL;

	}

	p->starttime = 0;

	p->endtime = 0;

	p->returncode = 1;

	p->pid = 0;

	p->causeofdeath = PROC_NORMALDEATH;

	return p;

}

void childsig(int sig)

{

	//wait(&stat_loc);

	DEBUG(("SIGCHLD\n"));

}

struct sigaction child_action;

proc *process_run(char executable[], char *args[], int timeout)

{

	proc *p = process_new();

	if (p == NULL)

		return NULL;

	char *text;

	int status;

	int stdout_p[2];

	int stderr_p[2];

	child_action.sa_handler = childsig;

	sigemptyset (&child_action.sa_mask);

	child_action.sa_flags = 0;

	sigaction (SIGCHLD, &child_action, NULL);

	pipe(stdout_p);

	pipe(stderr_p);

	pid_t child = fork();

	if (child == 0)

	{

		close(stdout_p[0]);

		dup2(stdout_p[1], 1);

		close(stdout_p[1]);

		close(stderr_p[0]);

		dup2(stderr_p[1], 2);

		close(stderr_p[1]);

		execvp(executable, args);

		exit(1);

	} else if (child == -1) {

		p->causeofdeath = PROC_SOMEODDDEATH;

		return p;

	}

	else

	{

		close(stdout_p[1]);

		close(stderr_p[1]);

		p->pid = child;

		DEBUG(("child running\n"));

	}

	struct pollfd pf[2];

	int pv;

	int have_status = 0;

	do

	{

		pf[0].fd = stdout_p[0];

		pf[1].fd = stderr_p[0];

		pf[0].events = POLLIN;

		pf[0].revents = 0;

		pf[1].events = POLLIN;

		pf[1].revents = 0;

		DEBUG(("polling\n"));

	       	pv = poll(pf, 2, timeout);

		DEBUG(("polled %d\n", pv));

		if (pv == -1)

		{

		       	if (errno == EAGAIN)

			{

				errno = 0;

				DEBUG(("errno: \n"));

				continue;

			} else {

				/* EINVAL - can't poll */

				process_free(&p);

				return NULL;

			}

		} else if (pv == 0 ) {

			/* timeout */

			DEBUG(("timeout: \n"));

			kill(p->pid, SIGTERM);

			p->causeofdeath = PROC_TIMEOUTDEATH;

			break;

		}

		if (pf[0].revents & POLLIN )

		{

			char *space = buffer_makespace(p->output, 1024);

			int nbytes = read(pf[0].fd, space, 1024);

			if (nbytes < 0)

				break;

			buffer_usespace(p->output, nbytes);

		}

		if (pf[1].revents & POLLIN )

		{

			char *space = buffer_makespace(p->output, 1024);

			int nbytes = read(pf[1].fd, space, 1024);

			if (nbytes < 0)

				break;

			buffer_usespace(p->output, nbytes);

		}

		if  (pf[0].revents & (POLLERR | POLLHUP | POLLNVAL))

		{

			DEBUG(("stdout: pollerr %d\n", pf[0].revents));

			break;

		}

		if (  pf[1].revents & (POLLERR | POLLHUP | POLLNVAL)) 

		{

			DEBUG(("stderr: pollerr %d\n", pf[1].revents));

			break;

		}

		DEBUG(("events: %d %d \n", pf[0].revents, pf[1].revents));

	}

	while (1);

	waitpid(p->pid, &status, 0);

	if (WIFEXITED(status))

	{

		p->causeofdeath = PROC_NORMALDEATH;

		p->returncode = WEXITSTATUS(status);

		DEBUG(("process exited normally \n"));

	} else {

		if (p->causeofdeath == PROC_TIMEOUTDEATH)

			p->returncode = 128;

		else {	

			p->causeofdeath = PROC_SOMEODDDEATH;

			if (WIFSIGNALED(status))

				p->returncode = WTERMSIG(status);

			else

				p->returncode = 128;

		}

		DEBUG(("process terminated \n"));

	}

	return p;

}

void process_free(proc **pp)

{

	if (!pp)

		return;

	if (! *pp)

		return;

	if ((*pp)->output)

		buffer_free(&((*pp)->output));

	free(*pp);

	*pp = NULL;

}