| 0,0 → 1,262 |
|---|
| /* |
| * 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. |
| */ |
| |
| /** |
| * @file ns.c |
| * @brief Naming service for HelenOS IPC. |
| */ |
| |
| #include <ipc/ipc.h> |
| #include <ipc/ns.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> |
| |
| #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; |
| |
| int static ping_phone; |
| |
| int main(int argc, char **argv) |
| { |
| ipc_call_t call; |
| ipc_callid_t callid; |
| char *as; |
| |
| ipcarg_t retval, arg1, arg2; |
| |
| printf("%s: Naming service started.\n", NAME); |
| |
| if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3, &ns_hash_table_ops)) { |
| printf("%s: cannot create hash table\n", NAME); |
| return ENOMEM; |
| } |
| |
| while (1) { |
| callid = ipc_wait_for_call(&call, 0); |
| // printf("NS: Call in_phone_hash=%lX...", call.in_phone_hash); |
| switch (IPC_GET_METHOD(call)) { |
| case IPC_M_AS_SEND: |
| as = (char *)IPC_GET_ARG2(call); |
| printf("Received as: %P, size:%d\n", as, IPC_GET_ARG3(call)); |
| retval = ipc_answer_fast(callid, 0,(sysarg_t)(1024*1024), 0); |
| if (!retval) { |
| printf("Reading shared memory..."); |
| printf("Text: %s", as); |
| } else |
| printf("Failed answer: %d\n", retval); |
| continue; |
| break; |
| case IPC_M_INTERRUPT: |
| printf("GOT INTERRUPT: %c\n", IPC_GET_ARG2(call)); |
| break; |
| case IPC_M_PHONE_HUNGUP: |
| printf("Phone hung up.\n"); |
| retval = 0; |
| break; |
| case IPC_M_CONNECT_TO_ME: |
| /* |
| * Server requests service registration. |
| */ |
| retval = register_service(IPC_GET_ARG1(call), IPC_GET_ARG3(call), &call); |
| ping_phone = IPC_GET_ARG3(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; |
| case NS_HANGUP: |
| printf("Closing connection.\n"); |
| retval = EHANGUP; |
| break; |
| case NS_PING: |
| printf("Ping...%P %P\n", IPC_GET_ARG1(call), |
| IPC_GET_ARG2(call)); |
| retval = 0; |
| arg1 = 0xdead; |
| arg2 = 0xbeef; |
| break; |
| case NS_PING_SVC: |
| printf("NS:Pinging service %d\n", ping_phone); |
| ipc_call_sync(ping_phone, NS_PING, 0xbeef, 0); |
| printf("NS:Got pong\n"); |
| break; |
| default: |
| printf("Unknown method: %zd\n", IPC_GET_METHOD(call)); |
| retval = ENOENT; |
| break; |
| } |
| if (! (callid & IPC_CALLID_NOTIFICATION)) { |
| // printf("Answering.\n"); |
| ipc_answer_fast(callid, retval, arg1, arg2); |
| } |
| } |
| } |
| |
| /** Register service. |
| * |
| * @param service Service to be registered. |
| * @param phone 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; |
| |
| printf("Registering service %d on phone %d...", service, phone); |
| |
| if (hash_table_find(&ns_hash_table, keys)) { |
| printf("Service %d already registered.\n", service); |
| return EEXISTS; |
| } |
| |
| hs = (hashed_service_t *) malloc(sizeof(hashed_service_t)); |
| if (!hs) { |
| printf("Failed to register service %d.\n", service); |
| 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) { |
| // printf("Service %d not registered.\n", service); |
| return ENOENT; |
| } |
| hs = hash_table_get_instance(hlp, hashed_service_t, link); |
| printf("Connecting in_phone_hash=%lX to service at phone %d...", call->in_phone_hash, hs->phone); |
| return ipc_forward_fast(callid, hs->phone, 0, 0); |
| } |
| |
| /** 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)); |
| } |