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1335 jermar 1
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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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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/**
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 * @file	ns.c
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 * @brief	Naming service for HelenOS IPC.
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 */
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1353 jermar 34
#include <ipc/ipc.h>
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#include <ipc/ns.h>
1030 palkovsky 36
#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
1335 jermar 40
#include <assert.h>
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#include <libadt/list.h>
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#include <libadt/hash_table.h>
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#define NAME	"NS"
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#define NS_HASH_TABLE_CHAINS	20
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1336 jermar 48
static int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call);
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static int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid);
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1335 jermar 51
/* Static functions implementing NS hash table operations. */
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static hash_index_t ns_hash(unsigned long *key);
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static int ns_compare(unsigned long *key, hash_count_t keys, link_t *item);
1336 jermar 54
static void ns_remove(link_t *item);
1335 jermar 55
 
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/** Operations for NS hash table. */
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static hash_table_operations_t ns_hash_table_ops = {
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	.hash = ns_hash,
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	.compare = ns_compare,
1336 jermar 60
	.remove_callback = ns_remove
1335 jermar 61
};
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/** NS hash table structure. */
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static hash_table_t ns_hash_table;
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/** NS hash table item. */
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typedef struct {
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	link_t link;
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	ipcarg_t service;		/**< Number of the service. */
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	ipcarg_t phone;			/**< Phone registered with the service. */
1336 jermar 71
	ipcarg_t in_phone_hash;		/**< Incoming phone hash. */
1335 jermar 72
} hashed_service_t;
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74
int static ping_phone;
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1030 palkovsky 76
int main(int argc, char **argv)
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{
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	ipc_call_t call;
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	ipc_callid_t callid;
1360 jermar 80
	char *as_area;
1030 palkovsky 81
 
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	ipcarg_t retval, arg1, arg2;
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1363 vana 84
//	printf("%s: Naming service started.\n", NAME);
1335 jermar 85
 
1336 jermar 86
	if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3, &ns_hash_table_ops)) {
1363 vana 87
//		printf("%s: cannot create hash table\n", NAME);
1335 jermar 88
		return ENOMEM;
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	}
1343 jermar 90
 
1030 palkovsky 91
	while (1) {
1365 jermar 92
		callid = ipc_wait_for_call(&call);
1343 jermar 93
//		printf("NS: Call in_phone_hash=%lX...", call.in_phone_hash);
1091 palkovsky 94
		switch (IPC_GET_METHOD(call)) {
1360 jermar 95
		case IPC_M_AS_AREA_SEND:
1418 jermar 96
			as_area = (char *)IPC_GET_ARG1(call);
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//			printf("Received as_area: %P, size:%d\n", as_area, IPC_GET_ARG2(call));
1343 jermar 98
			retval = ipc_answer_fast(callid, 0,(sysarg_t)(1024*1024), 0);
1330 palkovsky 99
			if (!retval) {
1363 vana 100
//				printf("Reading shared memory...");
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//				printf("Text: %s", as_area);
1330 palkovsky 102
			} else
1363 vana 103
//				printf("Failed answer: %d\n", retval);
1330 palkovsky 104
			continue;
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			break;
1259 palkovsky 106
		case IPC_M_INTERRUPT:
1363 vana 107
//			printf("GOT INTERRUPT: %c\n", IPC_GET_ARG2(call));
1259 palkovsky 108
			break;
1089 palkovsky 109
		case IPC_M_PHONE_HUNGUP:
1363 vana 110
//			printf("Phone hung up.\n");
1089 palkovsky 111
			retval = 0;
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			break;
1336 jermar 113
		case IPC_M_CONNECT_TO_ME:
1335 jermar 114
			/*
1336 jermar 115
			 * Server requests service registration.
1335 jermar 116
			 */
1336 jermar 117
			retval = register_service(IPC_GET_ARG1(call), IPC_GET_ARG3(call), &call);
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			ping_phone = IPC_GET_ARG3(call);
1030 palkovsky 119
			break;
1089 palkovsky 120
		case IPC_M_CONNECT_ME_TO:
1336 jermar 121
			/*
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			 * Client requests to be connected to a service.
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			 */
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			retval = connect_to_service(IPC_GET_ARG1(call), &call, callid);
1061 palkovsky 125
			break;
1338 jermar 126
		case NS_HANGUP:
1363 vana 127
//			printf("Closing connection.\n");
1338 jermar 128
			retval = EHANGUP;
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			break;
1030 palkovsky 130
		case NS_PING:
1363 vana 131
//			printf("Ping...%P %P\n", IPC_GET_ARG1(call),
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//			       IPC_GET_ARG2(call));
1030 palkovsky 133
			retval = 0;
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			arg1 = 0xdead;
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			arg2 = 0xbeef;
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			break;
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		case NS_PING_SVC:
1363 vana 138
//			printf("NS:Pinging service %d\n", ping_phone);
1335 jermar 139
			ipc_call_sync(ping_phone, NS_PING, 0xbeef, 0);
1363 vana 140
//			printf("NS:Got pong\n");
1030 palkovsky 141
			break;
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		default:
1363 vana 143
//			printf("Unknown method: %zd\n", IPC_GET_METHOD(call));
1030 palkovsky 144
			retval = ENOENT;
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			break;
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		}
1282 palkovsky 147
		if (! (callid & IPC_CALLID_NOTIFICATION)) {
1343 jermar 148
//			printf("Answering.\n");
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			ipc_answer_fast(callid, retval, arg1, arg2);
1282 palkovsky 150
		}
1030 palkovsky 151
	}
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}
1335 jermar 153
 
1338 jermar 154
/** Register service.
1336 jermar 155
 *
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 * @param service Service to be registered.
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 * @param phone phone Phone to be used for connections to the service.
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 * @param call Pointer to call structure.
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 *
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 * @return Zero on success or a value from @ref errno.h.
161
 */
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int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)
163
{
164
	unsigned long keys[3] = { service, call->in_phone_hash, 0 };
165
	hashed_service_t *hs;
166
 
1363 vana 167
//	printf("Registering service %d on phone %d...", service, phone);
1336 jermar 168
 
169
	if (hash_table_find(&ns_hash_table, keys)) {
1363 vana 170
//		printf("Service %d already registered.\n", service);
1336 jermar 171
		return EEXISTS;
172
	}
173
 
174
	hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
175
	if (!hs) {
1363 vana 176
//		printf("Failed to register service %d.\n", service);
1336 jermar 177
		return ENOMEM;
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	}
179
 
180
	link_initialize(&hs->link);
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	hs->service = service;
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	hs->phone = phone;
183
	hs->in_phone_hash = call->in_phone_hash;
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	hash_table_insert(&ns_hash_table, keys, &hs->link);
185
 
186
	return 0;
187
}
188
 
189
/** Connect client to service.
190
 *
191
 * @param service Service to be connected to.
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 * @param call Pointer to call structure.
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 * @param callid Call ID of the request.
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 *
195
 * @return Zero on success or a value from @ref errno.h.
196
 */
197
int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
198
{
199
	unsigned long keys[3] = { service, 0, 0 };
200
	link_t *hlp;
201
	hashed_service_t *hs;
202
 
203
	hlp = hash_table_find(&ns_hash_table, keys);
204
	if (!hlp) {
1343 jermar 205
//		printf("Service %d not registered.\n", service);
1336 jermar 206
		return ENOENT;
207
	}
208
	hs = hash_table_get_instance(hlp, hashed_service_t, link);
1363 vana 209
//	printf("Connecting in_phone_hash=%lX to service at phone %d...", call->in_phone_hash, hs->phone);
1336 jermar 210
	return ipc_forward_fast(callid, hs->phone, 0, 0);
211
}
212
 
1335 jermar 213
/** Compute hash index into NS hash table.
214
 *
1336 jermar 215
 * @param key Pointer keys. However, only the first key (i.e. service number)
216
 * 	      is used to compute the hash index.
217
 * @return Hash index corresponding to key[0].
1335 jermar 218
 */
219
hash_index_t ns_hash(unsigned long *key)
220
{
221
	assert(key);
222
	return *key % NS_HASH_TABLE_CHAINS;
223
}
224
 
225
/** Compare a key with hashed item.
226
 *
1336 jermar 227
 * This compare function always ignores the third key.
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 * It exists only to make it possible to remove records
229
 * originating from connection with key[1] in_phone_hash
230
 * value. Note that this is close to being classified
231
 * as a nasty hack.
232
 *
233
 * @param key Array of keys.
234
 * @param keys Must be lesser or equal to 3.
1335 jermar 235
 * @param item Pointer to a hash table item.
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 * @return Non-zero if the key matches the item, zero otherwise.
237
 */
1336 jermar 238
int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)
1335 jermar 239
{
240
	hashed_service_t *hs;
241
 
242
	assert(key);
1336 jermar 243
	assert(keys <= 3);
1335 jermar 244
	assert(item);
245
 
246
	hs = hash_table_get_instance(item, hashed_service_t, link);
247
 
1336 jermar 248
	if (keys == 2)
249
		return key[1] == hs->in_phone_hash;
250
	else
251
		return key[0] == hs->service;
1335 jermar 252
}
1336 jermar 253
 
254
/** Perform actions after removal of item from the hash table.
255
 *
256
 * @param item Item that was removed from the hash table.
257
 */
258
void ns_remove(link_t *item)
259
{
260
	assert(item);
261
	free(hash_table_get_instance(item, hashed_service_t, link));
262
}