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| 100 | * |
100 | * |
| 101 | * Calling process asks the callee to create a callback connection, |
101 | * Calling process asks the callee to create a callback connection, |
| 102 | * so that it can start initiating new messages. |
102 | * so that it can start initiating new messages. |
| 103 | * |
103 | * |
| 104 | * The protocol for negotiating is: |
104 | * The protocol for negotiating is: |
| 105 | * - sys_connect_to_me - sends a message IPC_M_CONNECTTOME |
105 | * - sys_connect_to_me - sends a message IPC_M_CONNECT_TO_ME |
| 106 | * - sys_wait_for_call - upon receipt tries to allocate new phone |
106 | * - sys_wait_for_call - upon receipt tries to allocate new phone |
| 107 | * - if it fails, responds with ELIMIT |
107 | * - if it fails, responds with ELIMIT |
| 108 | * - passes call to userspace. If userspace |
108 | * - passes call to userspace. If userspace |
| 109 | * responds with error, phone is deallocated and |
109 | * responds with error, phone is deallocated and |
| 110 | * error is sent back to caller. Otherwise |
110 | * error is sent back to caller. Otherwise |
| 111 | * the call is accepted and the response is sent back. |
111 | * the call is accepted and the response is sent back. |
| 112 | * - the allocated phoneid is passed to userspace |
112 | * - the allocated phoneid is passed to userspace |
| 113 | * (on the receiving sid) as ARG3 of the call. |
113 | * (on the receiving side) as ARG3 of the call. |
| 114 | * - the caller obtains taskid of the called thread |
114 | * - the caller obtains taskid of the called thread |
| 115 | */ |
115 | */ |
| 116 | #define IPC_M_CONNECT_TO_ME 1 |
116 | #define IPC_M_CONNECT_TO_ME 1 |
| 117 | /** Protocol for CONNECT - ME - TO |
117 | /** Protocol for CONNECT - ME - TO |
| 118 | * |
118 | * |