35,93 → 35,28 |
* @brief Naming service for HelenOS IPC. |
*/ |
|
|
#include <ipc/ipc.h> |
#include <ipc/services.h> |
#include <ipc/ns.h> |
#include <ipc/services.h> |
#include <unistd.h> |
#include <stdio.h> |
#include <bool.h> |
#include <unistd.h> |
#include <stdlib.h> |
#include <errno.h> |
#include <assert.h> |
#include <libadt/list.h> |
#include <libadt/hash_table.h> |
#include <as.h> |
#include <ddi.h> |
#include <event.h> |
#include <macros.h> |
#include <sysinfo.h> |
#include <loader/loader.h> |
#include <ddi.h> |
#include <as.h> |
#include "ns.h" |
#include "service.h" |
#include "clonable.h" |
#include "task.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 void connect_to_service(ipcarg_t service, ipc_call_t *call, |
ipc_callid_t callid); |
|
void register_clonable(ipcarg_t service, ipcarg_t phone, ipc_call_t *call, |
ipc_callid_t callid); |
void connect_to_clonable(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; |
|
/** Pending connection structure. */ |
typedef struct { |
link_t link; |
ipcarg_t service; /**< Number of the service. */ |
ipc_callid_t callid; /**< Call ID waiting for the connection */ |
ipcarg_t arg2; /**< Second argument */ |
ipcarg_t arg3; /**< Third argument */ |
} pending_req_t; |
|
static link_t pending_req; |
|
/** Request for connection to a clonable service. */ |
typedef struct { |
link_t link; |
ipcarg_t service; |
ipc_call_t call; |
ipc_callid_t callid; |
} cs_req_t; |
|
/** List of clonable-service connection requests. */ |
static link_t cs_req; |
|
static void *clockaddr = NULL; |
static void *klogaddr = NULL; |
|
/** Return true if @a service is clonable. */ |
static bool service_clonable(int service) |
static void get_as_area(ipc_callid_t callid, ipc_call_t *call, void *ph_addr, |
size_t pages, void **addr) |
{ |
return (service == SERVICE_LOAD); |
} |
|
static void get_as_area(ipc_callid_t callid, ipc_call_t *call, void *ph_addr, count_t pages, void **addr) |
{ |
if (ph_addr == NULL) { |
ipc_answer_0(callid, ENOENT); |
return; |
145,67 → 80,53 |
ipc_answer_2(callid, EOK, (ipcarg_t) *addr, AS_AREA_READ); |
} |
|
/** Process pending connection requests */ |
static void process_pending_req() |
{ |
link_t *cur; |
|
loop: |
for (cur = pending_req.next; cur != &pending_req; cur = cur->next) { |
pending_req_t *pr = list_get_instance(cur, pending_req_t, link); |
|
unsigned long keys[3] = { |
pr->service, |
0, |
0 |
}; |
|
link_t *link = hash_table_find(&ns_hash_table, keys); |
if (!link) |
continue; |
|
hashed_service_t *hs = hash_table_get_instance(link, hashed_service_t, link); |
ipcarg_t retval = ipc_forward_fast(pr->callid, hs->phone, |
pr->arg2, pr->arg3, 0, IPC_FF_NONE); |
|
if (!(pr->callid & IPC_CALLID_NOTIFICATION)) |
ipc_answer_0(pr->callid, retval); |
|
list_remove(cur); |
free(pr); |
goto loop; |
} |
} |
|
int main(int argc, char **argv) |
{ |
printf(NAME ": HelenOS IPC Naming Service\n"); |
|
if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3, |
&ns_hash_table_ops)) { |
printf(NAME ": No memory available for services\n"); |
return ENOMEM; |
} |
int rc = service_init(); |
if (rc != EOK) |
return rc; |
|
list_initialize(&pending_req); |
list_initialize(&cs_req); |
rc = clonable_init(); |
if (rc != EOK) |
return rc; |
|
rc = task_init(); |
if (rc != EOK) |
return rc; |
|
printf(NAME ": Accepting connections\n"); |
|
while (true) { |
process_pending_req(); |
process_pending_conn(); |
process_pending_wait(); |
|
ipc_call_t call; |
ipc_callid_t callid = ipc_wait_for_call(&call); |
|
task_id_t id; |
ipcarg_t retval; |
|
if (callid & IPC_CALLID_NOTIFICATION) { |
id = (task_id_t) |
MERGE_LOUP32(IPC_GET_ARG2(call), IPC_GET_ARG3(call)); |
wait_notification((wait_type_t) IPC_GET_ARG1(call), id); |
continue; |
} |
|
switch (IPC_GET_METHOD(call)) { |
case IPC_M_SHARE_IN: |
switch (IPC_GET_ARG3(call)) { |
case SERVICE_MEM_REALTIME: |
get_as_area(callid, &call, sysinfo_value("clock.faddr"), 1, &clockaddr); |
get_as_area(callid, &call, |
(void *) sysinfo_value("clock.faddr"), |
1, &clockaddr); |
break; |
case SERVICE_MEM_KLOG: |
get_as_area(callid, &call, sysinfo_value("klog.faddr"), sysinfo_value("klog.pages"), &klogaddr); |
get_as_area(callid, &call, |
(void *) sysinfo_value("klog.faddr"), |
sysinfo_value("klog.pages"), &klogaddr); |
break; |
default: |
ipc_answer_0(callid, ENOENT); |
241,6 → 162,14 |
continue; |
} |
break; |
case NS_PING: |
retval = EOK; |
break; |
case NS_TASK_WAIT: |
id = (task_id_t) |
MERGE_LOUP32(IPC_GET_ARG1(call), IPC_GET_ARG2(call)); |
wait_for_task(id, &call, callid); |
continue; |
default: |
retval = ENOENT; |
break; |
254,213 → 183,6 |
return 0; |
} |
|
/** 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 |
}; |
|
if (hash_table_find(&ns_hash_table, keys)) |
return EEXISTS; |
|
hashed_service_t *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. |
* |
*/ |
void connect_to_service(ipcarg_t service, ipc_call_t *call, ipc_callid_t callid) |
{ |
ipcarg_t retval; |
unsigned long keys[3] = { |
service, |
0, |
0 |
}; |
|
link_t *link = hash_table_find(&ns_hash_table, keys); |
if (!link) { |
if (IPC_GET_ARG4(*call) & IPC_FLAG_BLOCKING) { |
/* Blocking connection, add to pending list */ |
pending_req_t *pr = (pending_req_t *) malloc(sizeof(pending_req_t)); |
if (!pr) { |
retval = ENOMEM; |
goto out; |
} |
|
pr->service = service; |
pr->callid = callid; |
pr->arg2 = IPC_GET_ARG2(*call); |
pr->arg3 = IPC_GET_ARG3(*call); |
list_append(&pr->link, &pending_req); |
return; |
} |
retval = ENOENT; |
goto out; |
} |
|
hashed_service_t *hs = hash_table_get_instance(link, hashed_service_t, link); |
retval = ipc_forward_fast(callid, hs->phone, IPC_GET_ARG2(*call), |
IPC_GET_ARG3(*call), 0, IPC_FF_NONE); |
out: |
if (!(callid & IPC_CALLID_NOTIFICATION)) |
ipc_answer_0(callid, retval); |
} |
|
/** Register clonable service. |
* |
* @param service Service to be registered. |
* @param phone Phone to be used for connections to the service. |
* @param call Pointer to call structure. |
* |
*/ |
void register_clonable(ipcarg_t service, ipcarg_t phone, ipc_call_t *call, |
ipc_callid_t callid) |
{ |
if (list_empty(&cs_req)) { |
/* There was no pending connection request. */ |
printf(NAME ": Unexpected clonable server.\n"); |
ipc_answer_0(callid, EBUSY); |
return; |
} |
|
cs_req_t *csr = list_get_instance(cs_req.next, cs_req_t, link); |
list_remove(&csr->link); |
|
/* Currently we can only handle a single type of clonable service. */ |
assert(csr->service == SERVICE_LOAD); |
|
ipc_answer_0(callid, EOK); |
|
int rc = ipc_forward_fast(csr->callid, phone, IPC_GET_ARG2(csr->call), |
IPC_GET_ARG3(csr->call), 0, IPC_FF_NONE); |
|
free(csr); |
ipc_hangup(phone); |
} |
|
/** Connect client to clonable 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. |
* |
*/ |
void connect_to_clonable(ipcarg_t service, ipc_call_t *call, |
ipc_callid_t callid) |
{ |
assert(service == SERVICE_LOAD); |
|
cs_req_t *csr = malloc(sizeof(cs_req_t)); |
if (csr == NULL) { |
ipc_answer_0(callid, ENOMEM); |
return; |
} |
|
/* Spawn a loader. */ |
int rc = loader_spawn("loader"); |
|
if (rc < 0) { |
free(csr); |
ipc_answer_0(callid, rc); |
return; |
} |
|
csr->service = service; |
csr->call = *call; |
csr->callid = callid; |
|
/* |
* We can forward the call only after the server we spawned connects |
* to us. Meanwhile we might need to service more connection requests. |
* Thus we store the call in a queue. |
*/ |
list_append(&csr->link, &cs_req); |
} |
|
/** 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) |
{ |
assert(key); |
assert(keys <= 3); |
assert(item); |
|
hashed_service_t *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)); |
} |
|
/** |
* @} |
*/ |