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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 */
    fdi_node_t *files[4];
    fdi_node_t stdin_node;
    fdi_node_t stdout_node;
    fdi_node_t stderr_node;
    
    if ((stdin != NULL) && (fnode(stdin, &stdin_node) == EOK))
        files[0] = &stdin_node;
    else
        files[0] = NULL;
    
    if ((stdout != NULL) && (fnode(stdout, &stdout_node) == EOK))
        files[1] = &stdout_node;
    else
        files[1] = NULL;
    
    if ((stderr != NULL) && (fnode(stderr, &stderr_node) == EOK))
        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, int *retval)
{
    ipcarg_t rv;
    int rc;

    rc = (int) async_req_2_1(PHONE_NS, NS_TASK_WAIT, LOWER32(id),
        UPPER32(id), &rv);
    *retval = rv;

    return rc;
}

int task_retval(int val)
{
    task_id_t id;

    id = task_get_id();
    return (int) async_req_3_0(PHONE_NS, NS_RETVAL, LOWER32(id),
        UPPER32(id), val);
}

/** @}
 */