source: mainline/uspace/lib/c/generic/task.c@ a721f6a

/*
 * 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 <str.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.
 * @param err  If not NULL, the error value is stored here.
 *
 * @return ID of the newly created task or zero on error.
 *
 */
task_id_t task_spawn(const char *path, const char *const args[], int *err)
{
        /* Connect to a program loader. */
        loader_t *ldr = loader_connect();
        if (ldr == NULL) {
                if (err != NULL)
                        *err = EREFUSED;
                
                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 spawner's current working directory. */
        rc = loader_set_cwd(ldr);
        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);
        
        if (err != NULL)
                *err = EOK;
        
        return task_id;
        
error:
        /* Error exit */
        loader_abort(ldr);
        free(ldr);
        
        if (err != NULL)
                *err = rc;
        
        return 0;
}

int task_wait(task_id_t id, task_exit_t *texit, int *retval)
{
        ipcarg_t te, rv;
        int rc;

        rc = (int) async_req_2_2(PHONE_NS, NS_TASK_WAIT, LOWER32(id),
            UPPER32(id), &te, &rv);
        *texit = te;
        *retval = rv;

        return rc;
}

int task_retval(int val)
{
        return (int) async_req_1_0(PHONE_NS, NS_RETVAL, val);
}

/** @}
 */