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1175 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2006 Jakub Jermar
3148 svoboda 3 
 * Copyright (c) 2008 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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1866 jermar 30 
/** @addtogroup libc
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 * @{
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 */
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/** @file
1175 jermar 34 
 */
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#include <task.h>
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#include <ipc/ipc.h>
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#include <ipc/loader.h>
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#include <libc.h>
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#include <string.h>
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#include <stdlib.h>
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#include <async.h>
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#include <errno.h>
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task_id_t task_get_id(void)
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{
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    task_id_t task_id;
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    (void) __SYSCALL1(SYS_TASK_GET_ID, (sysarg_t) &task_id);
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    return task_id;
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}
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static int task_spawn_loader(void)
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{
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    int phone_id, rc;
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    rc = __SYSCALL1(SYS_PROGRAM_SPAWN_LOADER, (sysarg_t) &phone_id);
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    if (rc != 0)
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        return rc;
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    return phone_id;
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}
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static int loader_set_args(int phone_id, const char *argv[])
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{
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    aid_t req;
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    ipc_call_t answer;
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    ipcarg_t rc;
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    const char **ap;
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    char *dp;
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    char *arg_buf;
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    size_t buffer_size;
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    size_t len;
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    /*
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     * Serialize the arguments into a single array. First
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     * compute size of the buffer needed.
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     */
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    ap = argv;
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    buffer_size = 0;
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    while (*ap != NULL) {
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        buffer_size += strlen(*ap) + 1;
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        ++ap;
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    }
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    arg_buf = malloc(buffer_size);
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    if (arg_buf == NULL) return ENOMEM;
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    /* Now fill the buffer with null-terminated argument strings */
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    ap = argv;
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    dp = arg_buf;
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    while (*ap != NULL) {
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        strcpy(dp, *ap);
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        dp += strlen(*ap) + 1;
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        ++ap;
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    }
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    /* Send serialized arguments to the loader */
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    req = async_send_0(phone_id, LOADER_SET_ARGS, &answer);
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    rc = ipc_data_write_start(phone_id, (void *)arg_buf, buffer_size);
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    if (rc != EOK) {
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        async_wait_for(req, NULL);
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        return rc;
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    }
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    async_wait_for(req, &rc);
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    if (rc != EOK) return rc;
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    /* Free temporary buffer */
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    free(arg_buf);
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    return EOK;
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}
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3148 svoboda 119 
/** Create a new task by running an executable from VFS.
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 *
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 * @param path  pathname of the binary to execute
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 * @param argv  command-line arguments
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 * @return  ID of the newly created task or zero on error.
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 */
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task_id_t task_spawn(const char *path, const char *argv[])
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{
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    int phone_id;
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    ipc_call_t answer;
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    aid_t req;
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    int rc;
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    ipcarg_t retval;
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    /* Spawn a program loader */   
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    phone_id = task_spawn_loader();
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    if (phone_id < 0) return 0;
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    /*
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     * Say hello so that the loader knows the incoming connection's
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     * phone hash.
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     */
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    rc = async_req_0_0(phone_id, LOADER_HELLO);
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    if (rc != EOK) return 0;
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    /* Send program pathname */
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    req = async_send_0(phone_id, LOADER_SET_PATHNAME, &answer);
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    rc = ipc_data_write_start(phone_id, (void *)path, strlen(path));
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    if (rc != EOK) {
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        async_wait_for(req, NULL);
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        return 1;
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    }
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    async_wait_for(req, &retval);
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    if (retval != EOK) goto error;
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    /* Send arguments */
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    rc = loader_set_args(phone_id, argv);
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    if (rc != EOK) goto error;
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    /* Request loader to start the program */  
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    rc = async_req_0_0(phone_id, LOADER_RUN);
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    if (rc != EOK) goto error;
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    /* Success */
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    ipc_hangup(phone_id);
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    return 1;
3148 svoboda 166 
 
3174 svoboda 167 
    /* Error exit */
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error:
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    ipc_hangup(phone_id);
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    return 0;
3004 svoboda 171 
}
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1866 jermar 173 
/** @}
1653 cejka 174 
 */