WebSVN – HelenOS – Blame – /trunk/uspace/lib/libc/generic/task.c

Rev	Author	Line No.	Line
1175	jermar	1	/*
2071	jermar	2	* Copyright (c) 2006 Jakub Jermar
3222	svoboda	3	* Copyright (c) 2008 Jiri Svoboda
1175	jermar	4	* All rights reserved.
		5	*
		6	* Redistribution and use in source and binary forms, with or without
		7	* modification, are permitted provided that the following conditions
		8	* are met:
		9	*
		10	* - Redistributions of source code must retain the above copyright
		11	* notice, this list of conditions and the following disclaimer.
		12	* - Redistributions in binary form must reproduce the above copyright
		13	* notice, this list of conditions and the following disclaimer in the
		14	* documentation and/or other materials provided with the distribution.
		15	* - The name of the author may not be used to endorse or promote products
		16	* derived from this software without specific prior written permission.
		17	*
		18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1653	cejka	28	*/
		29
1866	jermar	30	/** @addtogroup libc
1653	cejka	31	* @{
		32	*/
		33	/** @file
1175	jermar	34	*/
		35
		36	#include <task.h>
3222	svoboda	37	#include <ipc/ipc.h>
		38	#include <ipc/loader.h>
1175	jermar	39	#include <libc.h>
3222	svoboda	40	#include <string.h>
		41	#include <stdlib.h>
		42	#include <async.h>
		43	#include <errno.h>
1175	jermar	44
1228	jermar	45	task_id_t task_get_id(void)
1175	jermar	46	{
		47	task_id_t task_id;
		48
1228	jermar	49	(void) __SYSCALL1(SYS_TASK_GET_ID, (sysarg_t) &task_id);
1175	jermar	50
		51	return task_id;
		52	}
1653	cejka	53
3222	svoboda	54	static int task_spawn_loader(void)
3073	decky	55	{
3222	svoboda	56	int phone_id, rc;
		57
		58	rc = __SYSCALL1(SYS_PROGRAM_SPAWN_LOADER, (sysarg_t) &phone_id);
		59	if (rc != 0)
		60	return rc;
		61
		62	return phone_id;
3073	decky	63	}
		64
3222	svoboda	65	static int loader_set_args(int phone_id, const char *argv[])
		66	{
		67	aid_t req;
		68	ipc_call_t answer;
		69	ipcarg_t rc;
		70
		71	const char **ap;
		72	char *dp;
		73	char *arg_buf;
		74	size_t buffer_size;
		75	size_t len;
		76
		77	/*
		78	* Serialize the arguments into a single array. First
		79	* compute size of the buffer needed.
		80	*/
		81	ap = argv;
		82	buffer_size = 0;
		83	while (*ap != NULL) {
		84	buffer_size += strlen(*ap) + 1;
		85	++ap;
		86	}
		87
		88	arg_buf = malloc(buffer_size);
		89	if (arg_buf == NULL) return ENOMEM;
		90
		91	/* Now fill the buffer with null-terminated argument strings */
		92	ap = argv;
		93	dp = arg_buf;
		94	while (*ap != NULL) {
		95	strcpy(dp, *ap);
		96	dp += strlen(*ap) + 1;
		97
		98	++ap;
		99	}
		100
		101	/* Send serialized arguments to the loader */
		102
		103	req = async_send_0(phone_id, LOADER_SET_ARGS, &answer);
		104	rc = ipc_data_write_start(phone_id, (void *)arg_buf, buffer_size);
		105	if (rc != EOK) {
		106	async_wait_for(req, NULL);
		107	return rc;
		108	}
		109
		110	async_wait_for(req, &rc);
		111	if (rc != EOK) return rc;
		112
		113	/* Free temporary buffer */
		114	free(arg_buf);
		115
		116	return EOK;
		117	}
		118
		119	/** Create a new task by running an executable from VFS.
		120	*
		121	* @param path pathname of the binary to execute
		122	* @param argv command-line arguments
		123	* @return ID of the newly created task or zero on error.
		124	*/
		125	task_id_t task_spawn(const char path, const char argv[])
		126	{
		127	int phone_id;
		128	ipc_call_t answer;
		129	aid_t req;
		130	int rc;
		131	ipcarg_t retval;
		132
		133	/* Spawn a program loader */
		134	phone_id = task_spawn_loader();
		135	if (phone_id < 0) return 0;
		136
		137	/*
		138	* Say hello so that the loader knows the incoming connection's
		139	* phone hash.
		140	*/
		141	rc = async_req_0_0(phone_id, LOADER_HELLO);
		142	if (rc != EOK) return 0;
		143
		144	/* Send program pathname */
		145	req = async_send_0(phone_id, LOADER_SET_PATHNAME, &answer);
		146	rc = ipc_data_write_start(phone_id, (void *)path, strlen(path));
		147	if (rc != EOK) {
		148	async_wait_for(req, NULL);
		149	return 1;
		150	}
		151
		152	async_wait_for(req, &retval);
		153	if (retval != EOK) goto error;
		154
		155	/* Send arguments */
		156	rc = loader_set_args(phone_id, argv);
		157	if (rc != EOK) goto error;
		158
		159	/* Request loader to start the program */
		160	rc = async_req_0_0(phone_id, LOADER_RUN);
		161	if (rc != EOK) goto error;
		162
		163	/* Success */
		164	ipc_hangup(phone_id);
		165	return 1;
		166
		167	/* Error exit */
		168	error:
		169	ipc_hangup(phone_id);
		170	return 0;
		171	}
		172
1866	jermar	173	/** @}
1653	cejka	174	*/

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(root)/trunk/uspace/lib/libc/generic/task.c – Rev 3222