WebSVN – HelenOS – Diff – /trunk/uspace/srv/ns/ns.c


/*
 * Copyright (c) 2006 Ondrej Palkovsky
 * 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 ns
 * @{
 */
 
/**
 * @file    ns.c
 * @brief   Naming service for HelenOS IPC.
 */
 
 
#include <ipc/ipc.h>
#include <ipc/ns.h>
#include <ipc/services.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <libadt/list.h>
#include <libadt/hash_table.h>
#include <sysinfo.h>
#include <ddi.h>
#include <as.h>
 
#define NAME    "NS"
 
#define NS_HASH_TABLE_CHAINS    20
 
static int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call);
static int connect_to_service(ipcarg_t service, ipc_call_t *call,
    ipc_callid_t callid);
 
/* Static functions implementing NS hash table operations. */
static hash_index_t ns_hash(unsigned long *key);
static int ns_compare(unsigned long *key, hash_count_t keys, link_t *item);
static void ns_remove(link_t *item);
 
/** Operations for NS hash table. */
static hash_table_operations_t ns_hash_table_ops = {
    .hash = ns_hash,
    .compare = ns_compare,
    .remove_callback = ns_remove
};
 
/** NS hash table structure. */
static hash_table_t ns_hash_table;
 
/** NS hash table item. */
typedef struct {
    link_t link;
    ipcarg_t service;       /**< Number of the service. */
    ipcarg_t phone;         /**< Phone registered with the service. */
    ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
} hashed_service_t;
 
static void *clockaddr = NULL;
static void *klogaddr = NULL;
 
static void get_as_area(ipc_callid_t callid, ipc_call_t *call, char *name,
    void **addr)
{
    void *ph_addr;
 
    if (!*addr) {
        ph_addr = (void *) sysinfo_value(name);
        if (!ph_addr) {
            ipc_answer_0(callid, ENOENT);
            return;
        }
        *addr = as_get_mappable_page(PAGE_SIZE);
        physmem_map(ph_addr, *addr, 1,
            AS_AREA_READ | AS_AREA_CACHEABLE);
    }
    ipc_answer_2(callid, EOK, (ipcarg_t) *addr, AS_AREA_READ);
}
 
int main(int argc, char **argv)
{
    ipc_call_t call;
    ipc_callid_t callid;
   
    ipcarg_t retval;
 
    if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3,
        &ns_hash_table_ops)) {
        return ENOMEM;
    }
       
    while (1) {
        callid = ipc_wait_for_call(&call);
        switch (IPC_GET_METHOD(call)) {
        case IPC_M_AS_AREA_RECV:
            switch (IPC_GET_ARG3(call)) {
            case SERVICE_MEM_REALTIME:
                get_as_area(callid, &call, "clock.faddr",
                    &clockaddr);
                break;
            case SERVICE_MEM_KLOG:
                get_as_area(callid, &call, "klog.faddr",
                    &klogaddr);
                break;
            default:
                ipc_answer_0(callid, ENOENT);
            }
            continue;
        case IPC_M_PHONE_HUNGUP:
            retval = EOK;
            break;
        case IPC_M_CONNECT_TO_ME:
            /*
             * Server requests service registration.
             */
            retval = register_service(IPC_GET_ARG1(call),
                IPC_GET_ARG3(call), &call);
            break;
        case IPC_M_CONNECT_ME_TO:
            /*
             * Client requests to be connected to a service.
             */
            retval = connect_to_service(IPC_GET_ARG1(call), &call,
                callid);
            break;
        default:
            retval = ENOENT;
            break;
        }
        if (!(callid & IPC_CALLID_NOTIFICATION)) {
            ipc_answer_0(callid, retval);
        }
    }
}
 
/** Register service.
 *
 * @param service Service to be registered.
 * @param phone Phone to be used for connections to the service.
 * @param call Pointer to call structure.
 *
 * @return Zero on success or a value from @ref errno.h.
 */
int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)
{
    unsigned long keys[3] = {
        service,
        call->in_phone_hash,
        0
    };
    hashed_service_t *hs;
           
    if (hash_table_find(&ns_hash_table, keys)) {
        return EEXISTS;
    }
           
    hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
    if (!hs) {
        return ENOMEM;
    }
           
    link_initialize(&hs->link);
    hs->service = service;
    hs->phone = phone;
    hs->in_phone_hash = call->in_phone_hash;
    hash_table_insert(&ns_hash_table, keys, &hs->link);
           
    return 0;
}
 
/** Connect client to service.
 *
 * @param service Service to be connected to.
 * @param call Pointer to call structure.
 * @param callid Call ID of the request.
 *
 * @return Zero on success or a value from @ref errno.h.
 */
int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
{
    unsigned long keys[3] = { service, 0, 0 };
    link_t *hlp;
    hashed_service_t *hs;
           
    hlp = hash_table_find(&ns_hash_table, keys);
    if (!hlp) {
        return ENOENT;
    }
    hs = hash_table_get_instance(hlp, hashed_service_t, link);
    return ipc_forward_fast(callid, hs->phone, IPC_GET_ARG2(*call), 0,
        IPC_FF_NONE);
}
 
/** Compute hash index into NS hash table.
 *
 * @param key Pointer keys. However, only the first key (i.e. service number)
 *        is used to compute the hash index.
 * @return Hash index corresponding to key[0].
 */
hash_index_t ns_hash(unsigned long *key)
{
    assert(key);
    return *key % NS_HASH_TABLE_CHAINS;
}
 
/** Compare a key with hashed item.
 *
 * This compare function always ignores the third key.
 * It exists only to make it possible to remove records
 * originating from connection with key[1] in_phone_hash
 * value. Note that this is close to being classified
 * as a nasty hack.
 *
 * @param key Array of keys.
 * @param keys Must be lesser or equal to 3.
 * @param item Pointer to a hash table item.
 * @return Non-zero if the key matches the item, zero otherwise.
 */
int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)
{
    hashed_service_t *hs;
 
    assert(key);
    assert(keys <= 3);
    assert(item);
   
    hs = hash_table_get_instance(item, hashed_service_t, link);
   
    if (keys == 2)
        return key[1] == hs->in_phone_hash;
    else
        return key[0] == hs->service;
}
 
/** Perform actions after removal of item from the hash table.
 *
 * @param item Item that was removed from the hash table.
 */
void ns_remove(link_t *item)
{
    assert(item);
    free(hash_table_get_instance(item, hashed_service_t, link));
}
 
/**
 * @}
 */
 

Rev 2619	Rev 2622
1	/*	1	/*
2	* Copyright (c) 2006 Ondrej Palkovsky	2	* Copyright (c) 2006 Ondrej Palkovsky
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup ns	29	/** @addtogroup ns
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file ns.c	34	* @file ns.c
35	* @brief Naming service for HelenOS IPC.	35	* @brief Naming service for HelenOS IPC.
36	*/	36	*/
37		37
38		38
39	#include <ipc/ipc.h>	39	#include <ipc/ipc.h>
40	#include <ipc/ns.h>	40	#include <ipc/ns.h>
41	#include <ipc/services.h>	41	#include <ipc/services.h>
42	#include <stdio.h>	42	#include <stdio.h>
43	#include <unistd.h>	43	#include <unistd.h>
44	#include <stdlib.h>	44	#include <stdlib.h>
45	#include <errno.h>	45	#include <errno.h>
46	#include <assert.h>	46	#include <assert.h>
47	#include <libadt/list.h>	47	#include <libadt/list.h>
48	#include <libadt/hash_table.h>	48	#include <libadt/hash_table.h>
49	#include <sysinfo.h>	49	#include <sysinfo.h>
50	#include <ddi.h>	50	#include <ddi.h>
51	#include <as.h>	51	#include <as.h>
52		52
53	#define NAME "NS"	53	#define NAME "NS"
54		54
55	#define NS_HASH_TABLE_CHAINS 20	55	#define NS_HASH_TABLE_CHAINS 20
56		56
57	static int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call);	57	static int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call);
58	static int connect_to_service(ipcarg_t service, ipc_call_t *call,	58	static int connect_to_service(ipcarg_t service, ipc_call_t *call,
59	ipc_callid_t callid);	59	ipc_callid_t callid);
60		60
61	/* Static functions implementing NS hash table operations. */	61	/* Static functions implementing NS hash table operations. */
62	static hash_index_t ns_hash(unsigned long *key);	62	static hash_index_t ns_hash(unsigned long *key);
63	static int ns_compare(unsigned long key, hash_count_t keys, link_t item);	63	static int ns_compare(unsigned long key, hash_count_t keys, link_t item);
64	static void ns_remove(link_t *item);	64	static void ns_remove(link_t *item);
65		65
66	/** Operations for NS hash table. */	66	/** Operations for NS hash table. */
67	static hash_table_operations_t ns_hash_table_ops = {	67	static hash_table_operations_t ns_hash_table_ops = {
68	.hash = ns_hash,	68	.hash = ns_hash,
69	.compare = ns_compare,	69	.compare = ns_compare,
70	.remove_callback = ns_remove	70	.remove_callback = ns_remove
71	};	71	};
72		72
73	/** NS hash table structure. */	73	/** NS hash table structure. */
74	static hash_table_t ns_hash_table;	74	static hash_table_t ns_hash_table;
75		75
76	/** NS hash table item. */	76	/** NS hash table item. */
77	typedef struct {	77	typedef struct {
78	link_t link;	78	link_t link;
79	ipcarg_t service; /*< Number of the service. /	79	ipcarg_t service; /*< Number of the service. /
80	ipcarg_t phone; /*< Phone registered with the service. /	80	ipcarg_t phone; /*< Phone registered with the service. /
81	ipcarg_t in_phone_hash; /*< Incoming phone hash. /	81	ipcarg_t in_phone_hash; /*< Incoming phone hash. /
82	} hashed_service_t;	82	} hashed_service_t;
83		83
84	static void *clockaddr = NULL;	84	static void *clockaddr = NULL;
85	static void *klogaddr = NULL;	85	static void *klogaddr = NULL;
86		86
87	static void get_as_area(ipc_callid_t callid, ipc_call_t call, char name,	87	static void get_as_area(ipc_callid_t callid, ipc_call_t call, char name,
88	void **addr)	88	void **addr)
89	{	89	{
90	void *ph_addr;	90	void *ph_addr;
91		91
92	if (!*addr) {	92	if (!*addr) {
93	ph_addr = (void *) sysinfo_value(name);	93	ph_addr = (void *) sysinfo_value(name);
94	if (!ph_addr) {	94	if (!ph_addr) {
95	ipc_answer_0(callid, ENOENT);	95	ipc_answer_0(callid, ENOENT);
96	return;	96	return;
97	}	97	}
98	*addr = as_get_mappable_page(PAGE_SIZE);	98	*addr = as_get_mappable_page(PAGE_SIZE);
99	physmem_map(ph_addr, *addr, 1,	99	physmem_map(ph_addr, *addr, 1,
100	AS_AREA_READ \| AS_AREA_CACHEABLE);	100	AS_AREA_READ \| AS_AREA_CACHEABLE);
101	}	101	}
102	ipc_answer_2(callid, EOK, (ipcarg_t) *addr, AS_AREA_READ);	102	ipc_answer_2(callid, EOK, (ipcarg_t) *addr, AS_AREA_READ);
103	}	103	}
104		104
105	int main(int argc, char **argv)	105	int main(int argc, char **argv)
106	{	106	{
107	ipc_call_t call;	107	ipc_call_t call;
108	ipc_callid_t callid;	108	ipc_callid_t callid;
109		109
110	ipcarg_t retval;	110	ipcarg_t retval;
111		111
112	if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3,	112	if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3,
113	&ns_hash_table_ops)) {	113	&ns_hash_table_ops)) {
114	return ENOMEM;	114	return ENOMEM;
115	}	115	}
116		116
117	while (1) {	117	while (1) {
118	callid = ipc_wait_for_call(&call);	118	callid = ipc_wait_for_call(&call);
119	switch (IPC_GET_METHOD(call)) {	119	switch (IPC_GET_METHOD(call)) {
120	case IPC_M_AS_AREA_RECV:	120	case IPC_M_AS_AREA_RECV:
121	switch (IPC_GET_ARG3(call)) {	121	switch (IPC_GET_ARG3(call)) {
122	case SERVICE_MEM_REALTIME:	122	case SERVICE_MEM_REALTIME:
123	get_as_area(callid, &call, "clock.faddr",	123	get_as_area(callid, &call, "clock.faddr",
124	&clockaddr);	124	&clockaddr);
125	break;	125	break;
126	case SERVICE_MEM_KLOG:	126	case SERVICE_MEM_KLOG:
127	get_as_area(callid, &call, "klog.faddr",	127	get_as_area(callid, &call, "klog.faddr",
128	&klogaddr);	128	&klogaddr);
129	break;	129	break;
130	default:	130	default:
131	ipc_answer_0(callid, ENOENT);	131	ipc_answer_0(callid, ENOENT);
132	}	132	}
133	continue;	133	continue;
134	case IPC_M_PHONE_HUNGUP:	134	case IPC_M_PHONE_HUNGUP:
135	retval = EOK;	135	retval = EOK;
136	break;	136	break;
137	case IPC_M_CONNECT_TO_ME:	137	case IPC_M_CONNECT_TO_ME:
138	/*	138	/*
139	* Server requests service registration.	139	* Server requests service registration.
140	*/	140	*/
141	retval = register_service(IPC_GET_ARG1(call),	141	retval = register_service(IPC_GET_ARG1(call),
142	IPC_GET_ARG3(call), &call);	142	IPC_GET_ARG3(call), &call);
143	break;	143	break;
144	case IPC_M_CONNECT_ME_TO:	144	case IPC_M_CONNECT_ME_TO:
145	/*	145	/*
146	* Client requests to be connected to a service.	146	* Client requests to be connected to a service.
147	*/	147	*/
148	retval = connect_to_service(IPC_GET_ARG1(call), &call,	148	retval = connect_to_service(IPC_GET_ARG1(call), &call,
149	callid);	149	callid);
150	break;	150	break;
151	default:	151	default:
152	retval = ENOENT;	152	retval = ENOENT;
153	break;	153	break;
154	}	154	}
155	if (!(callid & IPC_CALLID_NOTIFICATION)) {	155	if (!(callid & IPC_CALLID_NOTIFICATION)) {
156	ipc_answer_0(callid, retval);	156	ipc_answer_0(callid, retval);
157	}	157	}
158	}	158	}
159	}	159	}
160		160
161	/** Register service.	161	/** Register service.
162	*	162	*
163	* @param service Service to be registered.	163	* @param service Service to be registered.
164	* @param phone Phone to be used for connections to the service.	164	* @param phone Phone to be used for connections to the service.
165	* @param call Pointer to call structure.	165	* @param call Pointer to call structure.
166	*	166	*
167	* @return Zero on success or a value from @ref errno.h.	167	* @return Zero on success or a value from @ref errno.h.
168	*/	168	*/
169	int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)	169	int register_service(ipcarg_t service, ipcarg_t phone, ipc_call_t *call)
170	{	170	{
171	unsigned long keys[3] = {	171	unsigned long keys[3] = {
172	service,	172	service,
173	call->in_phone_hash,	173	call->in_phone_hash,
174	0	174	0
175	};	175	};
176	hashed_service_t *hs;	176	hashed_service_t *hs;
177		177
178	if (hash_table_find(&ns_hash_table, keys)) {	178	if (hash_table_find(&ns_hash_table, keys)) {
179	return EEXISTS;	179	return EEXISTS;
180	}	180	}
181		181
182	hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));	182	hs = (hashed_service_t *) malloc(sizeof(hashed_service_t));
183	if (!hs) {	183	if (!hs) {
184	return ENOMEM;	184	return ENOMEM;
185	}	185	}
186		186
187	link_initialize(&hs->link);	187	link_initialize(&hs->link);
188	hs->service = service;	188	hs->service = service;
189	hs->phone = phone;	189	hs->phone = phone;
190	hs->in_phone_hash = call->in_phone_hash;	190	hs->in_phone_hash = call->in_phone_hash;
191	hash_table_insert(&ns_hash_table, keys, &hs->link);	191	hash_table_insert(&ns_hash_table, keys, &hs->link);
192		192
193	return 0;	193	return 0;
194	}	194	}
195		195
196	/** Connect client to service.	196	/** Connect client to service.
197	*	197	*
198	* @param service Service to be connected to.	198	* @param service Service to be connected to.
199	* @param call Pointer to call structure.	199	* @param call Pointer to call structure.
200	* @param callid Call ID of the request.	200	* @param callid Call ID of the request.
201	*	201	*
202	* @return Zero on success or a value from @ref errno.h.	202	* @return Zero on success or a value from @ref errno.h.
203	*/	203	*/
204	int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)	204	int connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid)
205	{	205	{
206	unsigned long keys[3] = { service, 0, 0 };	206	unsigned long keys[3] = { service, 0, 0 };
207	link_t *hlp;	207	link_t *hlp;
208	hashed_service_t *hs;	208	hashed_service_t *hs;
209		209
210	hlp = hash_table_find(&ns_hash_table, keys);	210	hlp = hash_table_find(&ns_hash_table, keys);
211	if (!hlp) {	211	if (!hlp) {
212	return ENOENT;	212	return ENOENT;
213	}	213	}
214	hs = hash_table_get_instance(hlp, hashed_service_t, link);	214	hs = hash_table_get_instance(hlp, hashed_service_t, link);
215	return ipc_forward_fast(callid, hs->phone, IPC_GET_ARG2(*call), 0);	215	return ipc_forward_fast(callid, hs->phone, IPC_GET_ARG2(*call), 0,
-		216	IPC_FF_NONE);
216	}	217	}
217		218
218	/** Compute hash index into NS hash table.	219	/** Compute hash index into NS hash table.
219	*	220	*
220	* @param key Pointer keys. However, only the first key (i.e. service number)	221	* @param key Pointer keys. However, only the first key (i.e. service number)
221	* is used to compute the hash index.	222	* is used to compute the hash index.
222	* @return Hash index corresponding to key[0].	223	* @return Hash index corresponding to key[0].
223	*/	224	*/
224	hash_index_t ns_hash(unsigned long *key)	225	hash_index_t ns_hash(unsigned long *key)
225	{	226	{
226	assert(key);	227	assert(key);
227	return *key % NS_HASH_TABLE_CHAINS;	228	return *key % NS_HASH_TABLE_CHAINS;
228	}	229	}
229		230
230	/** Compare a key with hashed item.	231	/** Compare a key with hashed item.
231	*	232	*
232	* This compare function always ignores the third key.	233	* This compare function always ignores the third key.
233	* It exists only to make it possible to remove records	234	* It exists only to make it possible to remove records
234	* originating from connection with key[1] in_phone_hash	235	* originating from connection with key[1] in_phone_hash
235	* value. Note that this is close to being classified	236	* value. Note that this is close to being classified
236	* as a nasty hack.	237	* as a nasty hack.
237	*	238	*
238	* @param key Array of keys.	239	* @param key Array of keys.
239	* @param keys Must be lesser or equal to 3.	240	* @param keys Must be lesser or equal to 3.
240	* @param item Pointer to a hash table item.	241	* @param item Pointer to a hash table item.
241	* @return Non-zero if the key matches the item, zero otherwise.	242	* @return Non-zero if the key matches the item, zero otherwise.
242	*/	243	*/
243	int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)	244	int ns_compare(unsigned long key[], hash_count_t keys, link_t *item)
244	{	245	{
245	hashed_service_t *hs;	246	hashed_service_t *hs;
246		247
247	assert(key);	248	assert(key);
248	assert(keys <= 3);	249	assert(keys <= 3);
249	assert(item);	250	assert(item);
250		251
251	hs = hash_table_get_instance(item, hashed_service_t, link);	252	hs = hash_table_get_instance(item, hashed_service_t, link);
252		253
253	if (keys == 2)	254	if (keys == 2)
254	return key[1] == hs->in_phone_hash;	255	return key[1] == hs->in_phone_hash;
255	else	256	else
256	return key[0] == hs->service;	257	return key[0] == hs->service;
257	}	258	}
258		259
259	/** Perform actions after removal of item from the hash table.	260	/** Perform actions after removal of item from the hash table.
260	*	261	*
261	* @param item Item that was removed from the hash table.	262	* @param item Item that was removed from the hash table.
262	*/	263	*/
263	void ns_remove(link_t *item)	264	void ns_remove(link_t *item)
264	{	265	{
265	assert(item);	266	assert(item);
266	free(hash_table_get_instance(item, hashed_service_t, link));	267	free(hash_table_get_instance(item, hashed_service_t, link));
267	}	268	}
268		269
269	/**	270	/**
270	* @}	271	* @}
271	*/	272	*/
272		273

Subversion Repositories HelenOS

(root)/trunk/uspace/srv/ns/ns.c – Rev 2619 → 2622