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

Rev	Author	Line No.	Line
1175	jermar	1	/*
2071	jermar	2	* Copyright (c) 2006 Jakub Jermar
3148	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>
3004	svoboda	37	#include <ipc/ipc.h>
3148	svoboda	38	#include <ipc/loader.h>
3102	svoboda	39	#include <libc.h>
3148	svoboda	40	#include <string.h>
3174	svoboda	41	#include <stdlib.h>
3004	svoboda	42	#include <async.h>
		43	#include <errno.h>
3403	svoboda	44	#include <vfs/vfs.h>
1175	jermar	45
1228	jermar	46	task_id_t task_get_id(void)
1175	jermar	47	{
		48	task_id_t task_id;
		49
1228	jermar	50	(void) __SYSCALL1(SYS_TASK_GET_ID, (sysarg_t) &task_id);
1175	jermar	51
		52	return task_id;
		53	}
1653	cejka	54
3004	svoboda	55	static int task_spawn_loader(void)
		56	{
		57	int phone_id, rc;
		58
3203	svoboda	59	rc = __SYSCALL1(SYS_PROGRAM_SPAWN_LOADER, (sysarg_t) &phone_id);
3004	svoboda	60	if (rc != 0)
		61	return rc;
		62
		63	return phone_id;
		64	}
3148	svoboda	65
3174	svoboda	66	static int loader_set_args(int phone_id, const char *argv[])
		67	{
		68	aid_t req;
		69	ipc_call_t answer;
3202	svoboda	70	ipcarg_t rc;
3174	svoboda	71
		72	const char **ap;
		73	char *dp;
		74	char *arg_buf;
		75	size_t buffer_size;
		76	size_t len;
		77
		78	/*
		79	* Serialize the arguments into a single array. First
		80	* compute size of the buffer needed.
		81	*/
		82	ap = argv;
		83	buffer_size = 0;
		84	while (*ap != NULL) {
		85	buffer_size += strlen(*ap) + 1;
		86	++ap;
		87	}
		88
		89	arg_buf = malloc(buffer_size);
		90	if (arg_buf == NULL) return ENOMEM;
		91
		92	/* Now fill the buffer with null-terminated argument strings */
		93	ap = argv;
		94	dp = arg_buf;
		95	while (*ap != NULL) {
		96	strcpy(dp, *ap);
		97	dp += strlen(*ap) + 1;
		98
		99	++ap;
		100	}
		101
		102	/* Send serialized arguments to the loader */
		103
		104	req = async_send_0(phone_id, LOADER_SET_ARGS, &answer);
		105	rc = ipc_data_write_start(phone_id, (void *)arg_buf, buffer_size);
		106	if (rc != EOK) {
		107	async_wait_for(req, NULL);
		108	return rc;
		109	}
		110
		111	async_wait_for(req, &rc);
		112	if (rc != EOK) return rc;
		113
		114	/* Free temporary buffer */
		115	free(arg_buf);
		116
		117	return EOK;
		118	}
		119
3148	svoboda	120	/** Create a new task by running an executable from VFS.
		121	*
		122	* @param path pathname of the binary to execute
		123	* @param argv command-line arguments
		124	* @return ID of the newly created task or zero on error.
		125	*/
3190	svoboda	126	task_id_t task_spawn(const char path, const char argv[])
3004	svoboda	127	{
		128	int phone_id;
		129	ipc_call_t answer;
		130	aid_t req;
		131	int rc;
3216	svoboda	132	ipcarg_t retval;
3148	svoboda	133
3403	svoboda	134	char *pa;
		135	size_t pa_len;
		136
		137	pa = absolutize(path, &pa_len);
		138	if (!pa)
		139	return 0;
		140
3148	svoboda	141	/* Spawn a program loader */
3004	svoboda	142	phone_id = task_spawn_loader();
3403	svoboda	143	if (phone_id < 0)
		144	return 0;
3004	svoboda	145
3148	svoboda	146	/*
		147	* Say hello so that the loader knows the incoming connection's
		148	* phone hash.
		149	*/
		150	rc = async_req_0_0(phone_id, LOADER_HELLO);
3403	svoboda	151	if (rc != EOK)
		152	return 0;
3004	svoboda	153
3148	svoboda	154	/* Send program pathname */
		155	req = async_send_0(phone_id, LOADER_SET_PATHNAME, &answer);
3403	svoboda	156	rc = ipc_data_write_start(phone_id, (void *)pa, pa_len);
3004	svoboda	157	if (rc != EOK) {
3148	svoboda	158	async_wait_for(req, NULL);
3004	svoboda	159	return 1;
		160	}
		161
3216	svoboda	162	async_wait_for(req, &retval);
3403	svoboda	163	if (retval != EOK)
		164	goto error;
3004	svoboda	165
3174	svoboda	166	/* Send arguments */
		167	rc = loader_set_args(phone_id, argv);
3403	svoboda	168	if (rc != EOK)
		169	goto error;
3174	svoboda	170
3148	svoboda	171	/* Request loader to start the program */
		172	rc = async_req_0_0(phone_id, LOADER_RUN);
3403	svoboda	173	if (rc != EOK)
		174	goto error;
3004	svoboda	175
3174	svoboda	176	/* Success */
3148	svoboda	177	ipc_hangup(phone_id);
3174	svoboda	178	return 1;
3148	svoboda	179
3174	svoboda	180	/* Error exit */
		181	error:
		182	ipc_hangup(phone_id);
		183	return 0;
3004	svoboda	184	}
		185
1866	jermar	186	/** @}
1653	cejka	187	*/

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