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/*

 * Copyright (c) 2006 Jakub Jermar

 * Copyright (c) 2008 Jiri Svoboda

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup libc

 * @{

 */

/** @file

 */

#include <task.h>

#include <libc.h>

#include <stdlib.h>

#include <errno.h>

#include <loader/loader.h>

#include <string.h>

#include <ipc/ns.h>

#include <macros.h>

#include <async.h>

task_id_t task_get_id(void)

{

	task_id_t task_id;

	(void) __SYSCALL1(SYS_TASK_GET_ID, (sysarg_t) &task_id);

	return task_id;

}

/** Set the task name.

 *

 * @param name The new name, typically the command used to execute the

 *             program.

 *

 * @return Zero on success or negative error code.

 *

 */

int task_set_name(const char *name)

{

	return __SYSCALL2(SYS_TASK_SET_NAME, (sysarg_t) name, str_size(name));

}

/** Create a new task by running an executable from the filesystem.

 *

 * This is really just a convenience wrapper over the more complicated

 * loader API.

 *

 * @param path pathname of the binary to execute

 * @param argv command-line arguments

 *

 * @return ID of the newly created task or zero on error.

 *

 */

task_id_t task_spawn(const char *path, char *const args[])

{

	/* Connect to a program loader. */

	loader_t *ldr = loader_connect();

	if (ldr == NULL)

		return 0;

	/* Get task ID. */

	task_id_t task_id;

	int rc = loader_get_task_id(ldr, &task_id);

	if (rc != EOK)

		goto error;

	/* Send program pathname. */

	rc = loader_set_pathname(ldr, path);

	if (rc != EOK)

		goto error;

	/* Send arguments. */

	rc = loader_set_args(ldr, args);

	if (rc != EOK)

		goto error;

	/* Send default files */

	fs_node_t *files[4];

	fs_node_t stdin_node;

	fs_node_t stdout_node;

	fs_node_t stderr_node;

	if ((stdin != NULL) && (stdin != &stdin_null)) {

		fnode(stdin, &stdin_node);

		files[0] = &stdin_node;

	} else

		files[0] = NULL;

	if ((stdout != NULL) && (stdout != &stdout_klog)) {

		fnode(stdout, &stdout_node);

		files[1] = &stdout_node;

	} else

		files[1] = NULL;

	if ((stderr != NULL) && (stderr != &stdout_klog)) {

		fnode(stderr, &stderr_node);

		files[2] = &stderr_node;

	} else

		files[2] = NULL;

	files[3] = NULL;

	rc = loader_set_files(ldr, files);

	if (rc != EOK)

		goto error;

	/* Load the program. */

	rc = loader_load_program(ldr);

	if (rc != EOK)

		goto error;

	/* Run it. */

	rc = loader_run(ldr);

	if (rc != EOK)

		goto error;

	/* Success */

	free(ldr);

	return task_id;

error:

	/* Error exit */

	loader_abort(ldr);

	free(ldr);

	return 0;

}

int task_wait(task_id_t id)

{

	return (int) async_req_2_0(PHONE_NS, NS_TASK_WAIT, LOWER32(id), UPPER32(id));

}

/** @}

 */