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#define IPC_GET_ARG3(data)              ((data)[3])
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#define IPC_GET_ARG3(data)              ((data)[3])
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/* Well known phone descriptors */
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/* Well known phone descriptors */
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#define PHONE_NS              0
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#define PHONE_NS              0
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/* System-specific methods - only through special syscalls
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 * These methods have special behaviour
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 */
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#define IPC_M_IAMCONNECTING   0
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/** Protocol for CONNECT - TO - ME
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 *
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 * Calling process asks the callee to create a callback connection,
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 * so that it can start initiating new messages.
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 *
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 * The protocol for negotiating is as follows:
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 * - sys_connecttome - sends a message IPC_M_CONNECTTOME
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 * - sys_wait_for_call - upon receipt tries to allocate new phone
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 *                       - if it fails, responds with ELIMIT
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 *                     - passes call to userspace. If userspace
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 *                       responds with error, phone is deallocated and
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 *                       error is sent back to caller. Otherwise
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 *                       the call is accepted and the response is sent back.
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 *                     - the allocated phoneid is passed to userspace as
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 *                       ARG3 of the call.
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 *                     - the caller obtains taskid of the called thread
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 */
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#define IPC_M_CONNECTTOME     1
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#define IPC_M_CONNECTMETO     2
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/* Well-known methods */
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#define IPC_M_FIRST_USER      512
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#define IPC_M_PING            512
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/* User methods */
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#define FIRST_USER_METHOD     1024
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#ifdef KERNEL
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#ifdef KERNEL
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#include <synch/mutex.h>
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#include <synch/mutex.h>
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#include <synch/condvar.h>
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#include <synch/condvar.h>
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#include <adt/list.h>
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#include <adt/list.h>
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#define IPC_MAX_PHONES  16
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#define IPC_MAX_PHONES  16
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typedef struct answerbox answerbox_t;
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typedef struct answerbox answerbox_t;
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typedef __native ipc_data_t[IPC_CALL_LEN];
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typedef struct {
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typedef struct {
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    link_t list;
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    link_t list;
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    answerbox_t *callerbox;
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    answerbox_t *callerbox;
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    int flags;
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    int flags;
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    task_t *sender;
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    task_t *sender;
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    __native data[IPC_CALL_LEN];
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    ipc_data_t data;
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} call_t;
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} call_t;
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struct answerbox {
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struct answerbox {
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    SPINLOCK_DECLARE(lock);
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    SPINLOCK_DECLARE(lock);
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    task_t *task;
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    mutex_t mutex;
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    mutex_t mutex;
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    condvar_t cv;
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    condvar_t cv;
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    link_t connected_phones; /**< Phones connected to this answerbox */
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    link_t connected_phones; /**< Phones connected to this answerbox */
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    link_t calls;            /**< Received calls */
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    link_t calls;            /**< Received calls */