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  1. /*
  2.  * Copyright (c) 2009 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  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
  15.  *   derived from this software without specific prior written permission.
  16.  *
  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
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  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
  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
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup ns
  30.  * @{
  31.  */
  32.  
  33. #include <ipc/ipc.h>
  34. #include <ipc/services.h>
  35. #include <adt/list.h>
  36. #include <bool.h>
  37. #include <errno.h>
  38. #include <assert.h>
  39. #include <stdio.h>
  40. #include <malloc.h>
  41. #include <loader/loader.h>
  42. #include "clonable.h"
  43. #include "ns.h"
  44.  
  45. /** Request for connection to a clonable service. */
  46. typedef struct {
  47.     link_t link;
  48.     ipcarg_t service;
  49.     ipc_call_t call;
  50.     ipc_callid_t callid;
  51. } cs_req_t;
  52.  
  53. /** List of clonable-service connection requests. */
  54. static link_t cs_req;
  55.  
  56. int clonable_init(void)
  57. {
  58.     list_initialize(&cs_req);
  59.     return EOK;
  60. }
  61.  
  62. /** Return true if @a service is clonable. */
  63. bool service_clonable(int service)
  64. {
  65.     return (service == SERVICE_LOAD);
  66. }
  67.  
  68. /** Register clonable service.
  69.  *
  70.  * @param service Service to be registered.
  71.  * @param phone   Phone to be used for connections to the service.
  72.  * @param call    Pointer to call structure.
  73.  *
  74.  */
  75. void register_clonable(ipcarg_t service, ipcarg_t phone, ipc_call_t *call,
  76.     ipc_callid_t callid)
  77. {
  78.     if (list_empty(&cs_req)) {
  79.         /* There was no pending connection request. */
  80.         printf(NAME ": Unexpected clonable server.\n");
  81.         ipc_answer_0(callid, EBUSY);
  82.         return;
  83.     }
  84.    
  85.     cs_req_t *csr = list_get_instance(cs_req.next, cs_req_t, link);
  86.     list_remove(&csr->link);
  87.    
  88.     /* Currently we can only handle a single type of clonable service. */
  89.     assert(csr->service == SERVICE_LOAD);
  90.    
  91.     ipc_answer_0(callid, EOK);
  92.    
  93.     ipc_forward_fast(csr->callid, phone, IPC_GET_ARG2(csr->call),
  94.         IPC_GET_ARG3(csr->call), 0, IPC_FF_NONE);
  95.    
  96.     free(csr);
  97.     ipc_hangup(phone);
  98. }
  99.  
  100. /** Connect client to clonable service.
  101.  *
  102.  * @param service Service to be connected to.
  103.  * @param call    Pointer to call structure.
  104.  * @param callid  Call ID of the request.
  105.  *
  106.  * @return Zero on success or a value from @ref errno.h.
  107.  *
  108.  */
  109. void connect_to_clonable(ipcarg_t service, ipc_call_t *call,
  110.     ipc_callid_t callid)
  111. {
  112.     assert(service == SERVICE_LOAD);
  113.    
  114.     cs_req_t *csr = malloc(sizeof(cs_req_t));
  115.     if (csr == NULL) {
  116.         ipc_answer_0(callid, ENOMEM);
  117.         return;
  118.     }
  119.    
  120.     /* Spawn a loader. */
  121.     int rc = loader_spawn("loader");
  122.    
  123.     if (rc < 0) {
  124.         free(csr);
  125.         ipc_answer_0(callid, rc);
  126.         return;
  127.     }
  128.    
  129.     csr->service = service;
  130.     csr->call = *call;
  131.     csr->callid = callid;
  132.    
  133.     /*
  134.      * We can forward the call only after the server we spawned connects
  135.      * to us. Meanwhile we might need to service more connection requests.
  136.      * Thus we store the call in a queue.
  137.      */
  138.     list_append(&csr->link, &cs_req);
  139. }
  140.  
  141. /**
  142.  * @}
  143.  */
  144.