4 * DEBUG: section 54 Interprocess Communication
11 #include "base/TextException.h"
12 #include "comm/Connection.h"
14 #include "ipc/Messages.h"
16 #include "ipc/TypedMsgHdr.h"
17 #include "ipc/StartListening.h"
18 #include "ipc/SharedListen.h"
20 /// holds information necessary to handle JoinListen response
21 class PendingOpenRequest
24 Ipc::OpenListenerParams params
; ///< actual comm_open_sharedListen() parameters
25 AsyncCall::Pointer callback
; // who to notify
28 /// maps ID assigned at request time to the response callback
29 typedef std::map
<int, PendingOpenRequest
> SharedListenRequestMap
;
30 static SharedListenRequestMap TheSharedListenRequestMap
;
33 AddToMap(const PendingOpenRequest
&por
)
35 // find unused ID using linear seach; there should not be many entries
36 for (int id
= 0; true; ++id
) {
37 if (TheSharedListenRequestMap
.find(id
) == TheSharedListenRequestMap
.end()) {
38 TheSharedListenRequestMap
[id
] = por
;
42 assert(false); // not reached
46 Ipc::OpenListenerParams::OpenListenerParams()
48 xmemset(this, 0, sizeof(*this));
52 Ipc::OpenListenerParams::operator <(const OpenListenerParams
&p
) const
54 if (sock_type
!= p
.sock_type
)
55 return sock_type
< p
.sock_type
;
58 return proto
< p
.proto
;
60 // ignore flags and fdNote differences because they do not affect binding
62 return addr
.compareWhole(p
.addr
) < 0;
67 Ipc::SharedListenRequest::SharedListenRequest(): requestorId(-1), mapId(-1)
69 // caller will then set public data members
72 Ipc::SharedListenRequest::SharedListenRequest(const TypedMsgHdr
&hdrMsg
)
74 hdrMsg
.checkType(mtSharedListenRequest
);
78 void Ipc::SharedListenRequest::pack(TypedMsgHdr
&hdrMsg
) const
80 hdrMsg
.setType(mtSharedListenRequest
);
85 Ipc::SharedListenResponse::SharedListenResponse(const Comm::ConnectionPointer
&c
, int anErrNo
, int aMapId
):
86 conn(c
), errNo(anErrNo
), mapId(aMapId
)
90 Ipc::SharedListenResponse::SharedListenResponse(const TypedMsgHdr
&hdrMsg
):
91 conn(NULL
), errNo(0), mapId(-1)
93 hdrMsg
.checkType(mtSharedListenResponse
);
95 conn
= new Comm::Connection
;
96 conn
->fd
= hdrMsg
.getFd();
97 // other conn details are passed in OpenListenerParams and filled out by SharedListenJoin()
100 void Ipc::SharedListenResponse::pack(TypedMsgHdr
&hdrMsg
) const
102 hdrMsg
.setType(mtSharedListenResponse
);
103 hdrMsg
.putPod(*this);
104 hdrMsg
.putFd(conn
->fd
);
108 void Ipc::JoinSharedListen(const OpenListenerParams
¶ms
,
109 AsyncCall::Pointer
&callback
)
111 PendingOpenRequest por
;
113 por
.callback
= callback
;
115 SharedListenRequest request
;
116 request
.requestorId
= KidIdentifier
;
117 request
.params
= por
.params
;
118 request
.mapId
= AddToMap(por
);
120 debugs(54, 3, HERE
<< "getting listening FD for " << request
.params
.addr
<<
121 " mapId=" << request
.mapId
);
124 request
.pack(message
);
125 SendMessage(coordinatorAddr
, message
);
128 void Ipc::SharedListenJoined(const SharedListenResponse
&response
)
130 Comm::ConnectionPointer c
= response
.conn
;
132 // Dont debugs c fully since only FD is filled right now.
133 debugs(54, 3, HERE
<< "got listening FD " << c
->fd
<< " errNo=" <<
134 response
.errNo
<< " mapId=" << response
.mapId
);
136 Must(TheSharedListenRequestMap
.find(response
.mapId
) != TheSharedListenRequestMap
.end());
137 PendingOpenRequest por
= TheSharedListenRequestMap
[response
.mapId
];
138 Must(por
.callback
!= NULL
);
139 TheSharedListenRequestMap
.erase(response
.mapId
);
141 if (Comm::IsConnOpen(c
)) {
142 OpenListenerParams
&p
= por
.params
;
145 // XXX: leave the comm AI stuff to comm_import_opened()?
146 struct addrinfo
*AI
= NULL
;
147 p
.addr
.GetAddrInfo(AI
);
148 AI
->ai_socktype
= p
.sock_type
;
149 AI
->ai_protocol
= p
.proto
;
150 comm_import_opened(c
, FdNote(p
.fdNote
), AI
);
151 p
.addr
.FreeAddrInfo(AI
);
154 StartListeningCb
*cbd
= dynamic_cast<StartListeningCb
*>(por
.callback
->getDialer());
157 cbd
->errNo
= response
.errNo
;
158 cbd
->handlerSubscription
= por
.params
.handlerSubscription
;
159 ScheduleCallHere(por
.callback
);