/*
* 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 <ipc/ipc.h>
#include <ipc/loader.h>
#include <libc.h>
#include <task.h>
#include <string.h>
#include <stdlib.h>
#include <async.h>
#include <errno.h>
#include <vfs/vfs.h>
#include <loader/loader.h>
/** Connect to a new program loader.
*
* Spawns a new program loader task and returns the connection structure.
* @param name Symbolic name to set on the newly created task.
* @return Pointer to the loader connection structure (should be
* de-allocated using free() after use).
*/
loader_t *loader_spawn(const char *name)
{
int phone_id, rc;
loader_t *ldr;
/*
* Ask kernel to spawn a new loader task.
*/
rc = __SYSCALL3(SYS_PROGRAM_SPAWN_LOADER, (sysarg_t) &phone_id,
(sysarg_t
) name
, strlen(name
)); if (rc != 0)
return NULL;
/*
* Say hello so that the loader knows the incoming connection's
* phone hash.
*/
rc = async_req_0_0(phone_id, LOADER_HELLO);
if (rc != EOK)
return NULL;
ldr
= malloc(sizeof(loader_t
)); if (ldr == NULL)
return NULL;
ldr->phone_id = phone_id;
return ldr;
}
/** Get ID of the new task.
*
* Retrieves the ID of the new task from the loader.
*
* @param ldr Loader connection structure.
* @param task_id Points to a variable where the ID should be stored.
* @return Zero on success or negative error code.
*/
int loader_get_task_id(loader_t *ldr, task_id_t *task_id)
{
ipc_call_t answer;
aid_t req;
int rc;
ipcarg_t retval;
/* Get task ID. */
req = async_send_0(ldr->phone_id, LOADER_GET_TASKID, &answer);
rc = ipc_data_read_start(ldr->phone_id, task_id, sizeof(task_id_t));
if (rc != EOK) {
async_wait_for(req, NULL);
return rc;
}
async_wait_for(req, &retval);
return (int)retval;
}
/** Set pathname of the program to load.
*
* Sets the name of the program file to load. The name can be relative
* to the current working directory (it will be absolutized before
* sending to the loader).
*
* @param ldr Loader connection structure.
* @param path Pathname of the program file.
* @return Zero on success or negative error code.
*/
int loader_set_pathname(loader_t *ldr, const char *path)
{
ipc_call_t answer;
aid_t req;
int rc;
ipcarg_t retval;
char *pa;
size_t pa_len;
pa = absolutize(path, &pa_len);
if (!pa)
return 0;
/* Send program pathname */
req = async_send_0(ldr->phone_id, LOADER_SET_PATHNAME, &answer);
rc = ipc_data_write_start(ldr->phone_id, (void *)pa, pa_len);
if (rc != EOK) {
async_wait_for(req, NULL);
return rc;
}
async_wait_for(req, &retval);
return (int)retval;
}
/** Set command-line arguments for the program.
*
* Sets the vector of command-line arguments to be passed to the loaded
* program. By convention, the very first argument is typically the same as
* the command used to execute the program.
*
* @param ldr Loader connection structure.
* @param argv NULL-terminated array of pointers to arguments.
* @return Zero on success or negative error code.
*/
int loader_set_args(loader_t *ldr, char *const argv[])
{
aid_t req;
ipc_call_t answer;
ipcarg_t rc;
char *const *ap;
char *dp;
char *arg_buf;
size_t buffer_size;
/*
* Serialize the arguments into a single array. First
* compute size of the buffer needed.
*/
ap = argv;
buffer_size = 0;
while (*ap != NULL) {
buffer_size
+= strlen(*ap
) + 1; ++ap;
}
arg_buf
= malloc(buffer_size
); if (arg_buf == NULL) return ENOMEM;
/* Now fill the buffer with null-terminated argument strings */
ap = argv;
dp = arg_buf;
while (*ap != NULL) {
++ap;
}
/* Send serialized arguments to the loader */
req = async_send_0(ldr->phone_id, LOADER_SET_ARGS, &answer);
rc = ipc_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 */
return EOK;
}
/** Instruct loader to load the program.
*
* If this function succeeds, the program has been successfully loaded
* and is ready to be executed.
*
* @param ldr Loader connection structure.
* @return Zero on success or negative error code.
*/
int loader_load_program(loader_t *ldr)
{
int rc;
rc = async_req_0_0(ldr->phone_id, LOADER_LOAD);
if (rc != EOK)
return rc;
return EOK;
}
/** Instruct loader to execute the program.
*
* Note that this function blocks until the loader actually replies
* so you cannot expect this function to return if you are debugging
* the task and its thread is stopped.
*
* After using this function, no further operations must be performed
* on the loader structure. It should be de-allocated using free().
*
* @param ldr Loader connection structure.
* @return Zero on success or negative error code.
*/
int loader_run(loader_t *ldr)
{
int rc;
rc = async_req_0_0(ldr->phone_id, LOADER_RUN);
if (rc != EOK)
return rc;
return EOK;
}
/** Cancel the loader session.
*
* Tells the loader not to load any program and terminate.
* After using this function, no further operations must be performed
* on the loader structure. It should be de-allocated using free().
*
* @param ldr Loader connection structure.
* @return Zero on success or negative error code.
*/
void loader_abort(loader_t *ldr)
{
ipc_hangup(ldr->phone_id);
ldr->phone_id = 0;
}
/** @}
*/