loader.c

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/*
 * 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.
 */

#include <ipc/loader.h>
#include <ipc/services.h>
#include <ipc/ns.h>
#include <libc.h>
#include <task.h>
#include <str.h>
#include <stdlib.h>
#include <async.h>
#include <errno.h>
#include <vfs/vfs.h>
#include <loader/loader.h>

int loader_spawn(const char *name)
{
        return __SYSCALL2(SYS_PROGRAM_SPAWN_LOADER,
            (sysarg_t) name, str_size(name));
}

loader_t *loader_connect(void)
{
        int phone_id = service_connect_blocking(SERVICE_LOAD, 0, 0);
        if (phone_id < 0)
                return NULL;
        
        loader_t *ldr = malloc(sizeof(loader_t));
        if (ldr == NULL)
                return NULL;
        
        ldr->phone_id = phone_id;
        return ldr;
}

int loader_get_task_id(loader_t *ldr, task_id_t *task_id)
{
        /* Get task ID. */
        ipc_call_t answer;
        aid_t req = async_send_0(ldr->phone_id, LOADER_GET_TASKID, &answer);
        int rc = async_data_read_start(ldr->phone_id, task_id, sizeof(task_id_t));
        if (rc != EOK) {
                async_wait_for(req, NULL);
                return rc;
        }
        
        sysarg_t retval;
        async_wait_for(req, &retval);
        return (int) retval;
}

int loader_set_cwd(loader_t *ldr)
{
        char *cwd;
        size_t len;

        cwd = (char *) malloc(MAX_PATH_LEN + 1);
        if (!cwd)
                return ENOMEM;
        if (!getcwd(cwd, MAX_PATH_LEN + 1))
                str_cpy(cwd, MAX_PATH_LEN + 1, "/"); 
        len = str_length(cwd);
        
        ipc_call_t answer;
        aid_t req = async_send_0(ldr->phone_id, LOADER_SET_CWD, &answer);
        int rc = async_data_write_start(ldr->phone_id, cwd, len);
        free(cwd);
        if (rc != EOK) {
                async_wait_for(req, NULL);
                return rc;
        }
        
        sysarg_t retval;
        async_wait_for(req, &retval);
        return (int) retval;
}

int loader_set_pathname(loader_t *ldr, const char *path)
{
        size_t pa_len;
        char *pa = absolutize(path, &pa_len);
        if (!pa)
                return 0;
        
        /* Send program pathname */
        ipc_call_t answer;
        aid_t req = async_send_0(ldr->phone_id, LOADER_SET_PATHNAME, &answer);
        int rc = async_data_write_start(ldr->phone_id, (void *) pa, pa_len);
        if (rc != EOK) {
                free(pa);
                async_wait_for(req, NULL);
                return rc;
        }
        
        free(pa);
        
        sysarg_t retval;
        async_wait_for(req, &retval);
        return (int) retval;
}

int loader_set_args(loader_t *ldr, const char *const argv[])
{
        /*
         * Serialize the arguments into a single array. First
         * compute size of the buffer needed.
         */
        const char *const *ap = argv;
        size_t buffer_size = 0;
        while (*ap != NULL) {
                buffer_size += str_size(*ap) + 1;
                ap++;
        }
        
        char *arg_buf = malloc(buffer_size);
        if (arg_buf == NULL)
                return ENOMEM;
        
        /* Now fill the buffer with null-terminated argument strings */
        ap = argv;
        char *dp = arg_buf;
        
        while (*ap != NULL) {
                str_cpy(dp, buffer_size - (dp - arg_buf), *ap);
                dp += str_size(*ap) + 1;
                ap++;
        }
        
        /* Send serialized arguments to the loader */
        ipc_call_t answer;
        aid_t req = async_send_0(ldr->phone_id, LOADER_SET_ARGS, &answer);
        sysarg_t rc = async_data_write_start(ldr->phone_id, (void *) arg_buf, buffer_size);
        if (rc != EOK) {
                async_wait_for(req, NULL);
                return rc;
        }
        
        async_wait_for(req, &rc);
        if (rc != EOK)
                return rc;
        
        /* Free temporary buffer */
        free(arg_buf);
        
        return EOK;
}

int loader_set_files(loader_t *ldr, fdi_node_t *const files[])
{
        /*
         * Serialize the arguments into a single array. First
         * compute size of the buffer needed.
         */
        fdi_node_t *const *ap = files;
        size_t count = 0;
        while (*ap != NULL) {
                count++;
                ap++;
        }
        
        fdi_node_t *files_buf;
        files_buf = (fdi_node_t *) malloc(count * sizeof(fdi_node_t));
        if (files_buf == NULL)
                return ENOMEM;
        
        /* Fill the buffer */
        size_t i;
        for (i = 0; i < count; i++)
                files_buf[i] = *files[i];
        
        /* Send serialized files to the loader */
        ipc_call_t answer;
        aid_t req = async_send_0(ldr->phone_id, LOADER_SET_FILES, &answer);
        sysarg_t rc = async_data_write_start(ldr->phone_id, (void *) files_buf,
            count * sizeof(fdi_node_t));
        if (rc != EOK) {
                async_wait_for(req, NULL);
                return rc;
        }
        
        async_wait_for(req, &rc);
        if (rc != EOK)
                return rc;
        
        /* Free temporary buffer */
        free(files_buf);
        
        return EOK;
}

int loader_load_program(loader_t *ldr)
{
        return (int) async_req_0_0(ldr->phone_id, LOADER_LOAD);
}

int loader_run(loader_t *ldr)
{
        int rc = async_req_0_0(ldr->phone_id, LOADER_RUN);
        if (rc != EOK)
                return rc;
        
        async_hangup(ldr->phone_id);
        ldr->phone_id = 0;
        return EOK;
}

void loader_abort(loader_t *ldr)
{
        async_hangup(ldr->phone_id);
        ldr->phone_id = 0;
}

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