28,11 → 28,11 |
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/** @addtogroup ns |
* @{ |
*/ |
*/ |
|
/** |
* @file ns.c |
* @brief Naming service for HelenOS IPC. |
* @file ns.c |
* @brief Naming service for HelenOS IPC. |
*/ |
|
|
40,6 → 40,7 |
#include <ipc/ns.h> |
#include <ipc/services.h> |
#include <stdio.h> |
#include <bool.h> |
#include <unistd.h> |
#include <stdlib.h> |
#include <errno.h> |
47,17 → 48,24 |
#include <libadt/list.h> |
#include <libadt/hash_table.h> |
#include <sysinfo.h> |
#include <loader/loader.h> |
#include <ddi.h> |
#include <as.h> |
|
#define NAME "ns" |
#define NAME "ns" |
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#define NS_HASH_TABLE_CHAINS 20 |
#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, |
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); |
76,60 → 84,128 |
/** 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. */ |
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; |
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static link_t pending_req; |
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/** 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; |
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/** List of clonable-service connection requests. */ |
static link_t cs_req; |
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static void *clockaddr = NULL; |
static void *klogaddr = NULL; |
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static void get_as_area(ipc_callid_t callid, ipc_call_t *call, char *name, |
void **addr) |
/** Return true if @a service is clonable. */ |
static bool service_clonable(int service) |
{ |
void *ph_addr; |
return (service == SERVICE_LOAD); |
} |
|
if (!*addr) { |
ph_addr = (void *) sysinfo_value(name); |
if (!ph_addr) { |
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; |
} |
|
if (*addr == NULL) { |
*addr = as_get_mappable_page(pages * PAGE_SIZE); |
|
if (*addr == NULL) { |
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); |
|
if (physmem_map(ph_addr, *addr, pages, |
AS_AREA_READ | AS_AREA_CACHEABLE) != 0) { |
ipc_answer_0(callid, ENOENT); |
return; |
} |
} |
|
ipc_answer_2(callid, EOK, (ipcarg_t) *addr, AS_AREA_READ); |
} |
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/** 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); |
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unsigned long keys[3] = { |
pr->service, |
0, |
0 |
}; |
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link_t *link = hash_table_find(&ns_hash_table, keys); |
if (!link) |
continue; |
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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); |
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if (!(pr->callid & IPC_CALLID_NOTIFICATION)) |
ipc_answer_0(pr->callid, retval); |
|
list_remove(cur); |
free(pr); |
goto loop; |
} |
} |
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int main(int argc, char **argv) |
{ |
printf(NAME ": HelenOS IPC Naming Service\n"); |
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ipc_call_t call; |
ipc_callid_t callid; |
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ipcarg_t retval; |
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if (!hash_table_create(&ns_hash_table, NS_HASH_TABLE_CHAINS, 3, |
&ns_hash_table_ops)) { |
printf(NAME ": No memory available\n"); |
printf(NAME ": No memory available for services\n"); |
return ENOMEM; |
} |
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list_initialize(&pending_req); |
list_initialize(&cs_req); |
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printf(NAME ": Accepting connections\n"); |
while (1) { |
callid = ipc_wait_for_call(&call); |
while (true) { |
process_pending_req(); |
|
ipc_call_t call; |
ipc_callid_t callid = ipc_wait_for_call(&call); |
ipcarg_t retval; |
|
switch (IPC_GET_METHOD(call)) { |
case IPC_M_SHARE_IN: |
switch (IPC_GET_ARG3(call)) { |
case SERVICE_MEM_REALTIME: |
get_as_area(callid, &call, "clock.faddr", |
&clockaddr); |
get_as_area(callid, &call, sysinfo_value("clock.faddr"), 1, &clockaddr); |
break; |
case SERVICE_MEM_KLOG: |
get_as_area(callid, &call, "klog.faddr", |
&klogaddr); |
get_as_area(callid, &call, sysinfo_value("klog.faddr"), sysinfo_value("klog.pages"), &klogaddr); |
break; |
default: |
ipc_answer_0(callid, ENOENT); |
142,23 → 218,36 |
/* |
* Server requests service registration. |
*/ |
retval = register_service(IPC_GET_ARG1(call), |
IPC_GET_ARG5(call), &call); |
if (service_clonable(IPC_GET_ARG1(call))) { |
register_clonable(IPC_GET_ARG1(call), |
IPC_GET_ARG5(call), &call, callid); |
continue; |
} else { |
retval = register_service(IPC_GET_ARG1(call), |
IPC_GET_ARG5(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); |
if (service_clonable(IPC_GET_ARG1(call))) { |
connect_to_clonable(IPC_GET_ARG1(call), |
&call, callid); |
continue; |
} else { |
connect_to_service(IPC_GET_ARG1(call), &call, |
callid); |
continue; |
} |
break; |
default: |
retval = ENOENT; |
break; |
} |
if (!(callid & IPC_CALLID_NOTIFICATION)) { |
|
if (!(callid & IPC_CALLID_NOTIFICATION)) |
ipc_answer_0(callid, retval); |
} |
} |
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/* Not reached */ |
168,10 → 257,11 |
/** 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. |
* @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) |
{ |
180,23 → 270,20 |
call->in_phone_hash, |
0 |
}; |
hashed_service_t *hs; |
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if (hash_table_find(&ns_hash_table, keys)) { |
|
if (hash_table_find(&ns_hash_table, keys)) |
return EEXISTS; |
} |
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hs = (hashed_service_t *) malloc(sizeof(hashed_service_t)); |
if (!hs) { |
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hashed_service_t *hs = (hashed_service_t *) malloc(sizeof(hashed_service_t)); |
if (!hs) |
return ENOMEM; |
} |
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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); |
|
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return 0; |
} |
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203,36 → 290,135 |
/** Connect client to service. |
* |
* @param service Service to be connected to. |
* @param call Pointer to call structure. |
* @param callid Call ID of the request. |
* @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) |
void 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; |
ipcarg_t retval; |
unsigned long keys[3] = { |
service, |
0, |
0 |
}; |
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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; |
} |
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hlp = hash_table_find(&ns_hash_table, keys); |
if (!hlp) { |
return ENOENT; |
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; |
} |
hs = hash_table_get_instance(hlp, hashed_service_t, link); |
return ipc_forward_fast(callid, hs->phone, IPC_GET_ARG2(*call), |
IPC_GET_ARG3(*call), 0, IPC_FF_NONE); |
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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); |
} |
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/** 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; |
} |
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cs_req_t *csr = list_get_instance(cs_req.next, cs_req_t, link); |
list_remove(&csr->link); |
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/* Currently we can only handle a single type of clonable service. */ |
assert(csr->service == SERVICE_LOAD); |
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ipc_answer_0(callid, EOK); |
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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); |
} |
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/** 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; |
} |
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/* 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); |
} |
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/** 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. |
* 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; |
return (*key % NS_HASH_TABLE_CHAINS); |
} |
|
/** Compare a key with hashed item. |
243,20 → 429,20 |
* value. Note that this is close to being classified |
* as a nasty hack. |
* |
* @param key Array of keys. |
* @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); |
hashed_service_t *hs = hash_table_get_instance(item, hashed_service_t, link); |
|
if (keys == 2) |
return key[1] == hs->in_phone_hash; |
267,6 → 453,7 |
/** 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) |
{ |
274,6 → 461,6 |
free(hash_table_get_instance(item, hashed_service_t, link)); |
} |
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/** |
/** |
* @} |
*/ |