/*
* 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>
#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;
int static ping_phone;
static void get_realtime_as(ipc_callid_t callid, ipc_call_t *call)
{
static void *addr = NULL;
void *ph_addr;
if (!addr) {
ph_addr = (void *)sysinfo_value("clock.faddr");
if (!ph_addr) {
ipc_answer_fast(callid, ENOENT, 0, 0);
return;
}
addr = as_get_mappable_page(PAGE_SIZE);
map_physmem(ph_addr, addr, 1, AS_AREA_READ | AS_AREA_CACHEABLE);
}
ipc_answer_fast(callid, 0, (ipcarg_t)addr, AS_AREA_READ | AS_AREA_CACHEABLE);
}
int main(int argc, char **argv)
{
ipc_call_t call;
ipc_callid_t callid;
char *as_area;
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);
// printf("NS: Call in_phone_hash=%lX...", call.in_phone_hash);
switch (IPC_GET_METHOD(call)) {
case IPC_M_AS_AREA_SEND:
as_area = (char *)IPC_GET_ARG1(call);
// printf("Received as_area: %P, size:%d\n", as_area, IPC_GET_ARG2(call));
retval = ipc_answer_fast(callid, 0,(sysarg_t)(1024*1024), 0);
if (!retval) {
// printf("Reading shared memory...");
// printf("Text: %s", as_area);
} else
// printf("Failed answer: %d\n", retval);
continue;
case IPC_M_AS_AREA_RECV:
get_realtime_as(callid, &call);
continue;
case IPC_M_INTERRUPT:
break;
case IPC_M_PHONE_HUNGUP:
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)
{
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;
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)
{
free(hash_table_get_instance
(item
, hashed_service_t
, link
)); }