WebSVN – HelenOS – Diff – /branches/dynload/kernel/generic/src/ipc/sysipc.c


/*
 * Copyright (C) 2006 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <arch.h>
#include <proc/task.h>
#include <proc/thread.h>
#include <errno.h>
#include <memstr.h>
#include <debug.h>
#include <ipc/ipc.h>
#include <ipc/sysipc.h>
#include <ipc/irq.h>
#include <ipc/ipcrsc.h>
#include <arch/interrupt.h>
#include <print.h>
#include <syscall/copy.h>
#include <security/cap.h>
#include <mm/as.h>
 
#define GET_CHECK_PHONE(phone,phoneid,err) { \
      if (phoneid > IPC_MAX_PHONES) { err; } \
      phone = &TASK->phones[phoneid]; \
}
 
#define STRUCT_TO_USPACE(dst,src) copy_to_uspace(dst,src,sizeof(*(src)))
 
/** Return true if the method is a system method */
static inline int is_system_method(__native method)
{
    if (method <= IPC_M_LAST_SYSTEM)
        return 1;
    return 0;
}
 
/** Return true if the message with this method is forwardable
 *
 * - some system messages may be forwarded, for some of them
 *   it is useless
 */
static inline int is_forwardable(__native method)
{
    if (method == IPC_M_PHONE_HUNGUP || method == IPC_M_AS_AREA_SEND)
        return 0; /* This message is meant only for the receiver */
    return 1;
}
 
/****************************************************/
/* Functions that preprocess answer before sending
 * it to the recepient
 */
 
/** Return true if the caller (ipc_answer) should save
 * the old call contents for answer_preprocess
 */
static inline int answer_need_old(call_t *call)
{
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
        return 1;
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)
        return 1;
    if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_SEND)
        return 1;
    return 0;
}
 
/** Interpret process answer as control information */
static inline int answer_preprocess(call_t *answer, ipc_data_t *olddata)
{
    int phoneid;
 
    if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
        /* In case of forward, hangup the forwared phone,
         * not the originator
         */
        spinlock_lock(&answer->data.phone->lock);
        spinlock_lock(&TASK->answerbox.lock);
        if (answer->data.phone->callee) {
            list_remove(&answer->data.phone->list);
            answer->data.phone->callee = 0;
        }
        spinlock_unlock(&TASK->answerbox.lock);
        spinlock_unlock(&answer->data.phone->lock);
    }
 
    if (!olddata)
        return 0;
 
    if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
        phoneid = IPC_GET_ARG3(*olddata);
        if (IPC_GET_RETVAL(answer->data)) {
            /* The connection was not accepted */
            phone_dealloc(phoneid);
        } else {
            /* The connection was accepted */
            phone_connect(phoneid,&answer->sender->answerbox);
            /* Set 'phone identification' as arg3 of response */
            IPC_SET_ARG3(answer->data, (__native)&TASK->phones[phoneid]);
        }
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
        /* If the users accepted call, connect */
        if (!IPC_GET_RETVAL(answer->data)) {
            ipc_phone_connect((phone_t *)IPC_GET_ARG3(*olddata),
                      &TASK->answerbox);
        }
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
        if (!IPC_GET_RETVAL(answer->data)) { /* Accepted, handle as_area receipt */
            return as_area_steal(answer->sender,
                         IPC_GET_ARG2(*olddata),IPC_GET_ARG3(*olddata),
                         IPC_GET_ARG1(answer->data));
        }
    }
    return 0;
}
 
/** Called before the request is sent
 *
 * @return 0 - no error, -1 - report error to user
 */
static int request_preprocess(call_t *call)
{
    int newphid;
    size_t size;
 
    switch (IPC_GET_METHOD(call->data)) {
    case IPC_M_CONNECT_ME_TO:
        newphid = phone_alloc();
        if (newphid < 0)
            return ELIMIT;
        /* Set arg3 for server */
        IPC_SET_ARG3(call->data, (__native)&TASK->phones[newphid]);
        call->flags |= IPC_CALL_CONN_ME_TO;
        call->private = newphid;
        break;
    case IPC_M_AS_AREA_SEND:
        size = as_get_size(IPC_GET_ARG2(call->data));
        if (!size) {
            return EPERM;
        }
        IPC_SET_ARG3(call->data, size);
        break;
    default:
        break;
    }
    return 0;
}
 
/****************************************************/
/* Functions called to process received call/answer
 * before passing to uspace
 */
 
/** Do basic kernel processing of received call answer */
static void process_answer(call_t *call)
{
    if (IPC_GET_RETVAL(call->data) == EHANGUP && \
        call->flags & IPC_CALL_FORWARDED)
        IPC_SET_RETVAL(call->data, EFORWARD);
 
    if (call->flags & IPC_CALL_CONN_ME_TO) {
        if (IPC_GET_RETVAL(call->data))
            phone_dealloc(call->private);
        else
            IPC_SET_ARG3(call->data, call->private);
    }
}
 
/** Do basic kernel processing of received call request
 *
 * @return 0 - the call should be passed to userspace, 1 - ignore call
 */
static int process_request(answerbox_t *box,call_t *call)
{
    int phoneid;
 
    if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
        phoneid = phone_alloc();
        if (phoneid < 0) { /* Failed to allocate phone */
            IPC_SET_RETVAL(call->data, ELIMIT);
            ipc_answer(box,call);
            return -1;
        }
        IPC_SET_ARG3(call->data, phoneid);
    }
    return 0;
}
 
/** Send a call over IPC, wait for reply, return to user
 *
 * @return Call identification, returns -1 on fatal error,
           -2 on 'Too many async request, handle answers first
 */
__native sys_ipc_call_sync_fast(__native phoneid, __native method,
                __native arg1, ipc_data_t *data)
{
    call_t call;
    phone_t *phone;
    int res;
 
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
 
    ipc_call_static_init(&call);
    IPC_SET_METHOD(call.data, method);
    IPC_SET_ARG1(call.data, arg1);
 
    if (!(res=request_preprocess(&call))) {
        ipc_call_sync(phone, &call);
        process_answer(&call);
    } else
        IPC_SET_RETVAL(call.data, res);
    STRUCT_TO_USPACE(&data->args, &call.data.args);
 
    return 0;
}
 
/** Synchronous IPC call allowing to send whole message */
__native sys_ipc_call_sync(__native phoneid, ipc_data_t *question,
               ipc_data_t *reply)
{
    call_t call;
    phone_t *phone;
    int res;
    int rc;
 
    ipc_call_static_init(&call);
    rc = copy_from_uspace(&call.data.args, &question->args, sizeof(call.data.args));
    if (rc != 0)
        return (__native) rc;
 
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
 
    if (!(res=request_preprocess(&call))) {
        ipc_call_sync(phone, &call);
        process_answer(&call);
    } else
        IPC_SET_RETVAL(call.data, res);
 
    rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
    if (rc != 0)
        return rc;
 
    return 0;
}
 
/** Check that the task did not exceed allowed limit
 *
 * @return 0 - Limit OK,   -1 - limit exceeded
 */
static int check_call_limit(void)
{
    if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
        atomic_dec(&TASK->active_calls);
        return -1;
    }
    return 0;
}
 
/** Send an asynchronous call over ipc
 *
 * @return Call identification, returns -1 on fatal error,
           -2 on 'Too many async request, handle answers first
 */
__native sys_ipc_call_async_fast(__native phoneid, __native method,
                 __native arg1, __native arg2)
{
    call_t *call;
    phone_t *phone;
    int res;
 
    if (check_call_limit())
        return IPC_CALLRET_TEMPORARY;
 
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
 
    call = ipc_call_alloc(0);
    IPC_SET_METHOD(call->data, method);
    IPC_SET_ARG1(call->data, arg1);
    IPC_SET_ARG2(call->data, arg2);
 
    if (!(res=request_preprocess(call)))
        ipc_call(phone, call);
    else
        ipc_backsend_err(phone, call, res);
 
    return (__native) call;
}
 
/** Synchronous IPC call allowing to send whole message
 *
 * @return The same as sys_ipc_call_async
 */
__native sys_ipc_call_async(__native phoneid, ipc_data_t *data)
{
    call_t *call;
    phone_t *phone;
    int res;
    int rc;
 
    if (check_call_limit())
        return IPC_CALLRET_TEMPORARY;
 
    GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
 
    call = ipc_call_alloc(0);
    rc = copy_from_uspace(&call->data.args, &data->args, sizeof(call->data.args));
    if (rc != 0) {
        ipc_call_free(call);
        return (__native) rc;
    }
    if (!(res=request_preprocess(call)))
        ipc_call(phone, call);
    else
        ipc_backsend_err(phone, call, res);
 
    return (__native) call;
}
 
/** Forward received call to another destination
 *
 * The arg1 and arg2 are changed in the forwarded message
 *
 * Warning: If implementing non-fast version, make sure that
 *          arg3 is not rewritten for certain system IPC
 */
__native sys_ipc_forward_fast(__native callid, __native phoneid,
                  __native method, __native arg1)
{
    call_t *call;
    phone_t *phone;
 
    call = get_call(callid);
    if (!call)
        return ENOENT;
 
    call->flags |= IPC_CALL_FORWARDED;
 
    GET_CHECK_PHONE(phone, phoneid, {
        IPC_SET_RETVAL(call->data, EFORWARD);
        ipc_answer(&TASK->answerbox, call);
        return ENOENT;
    });    
 
    if (!is_forwardable(IPC_GET_METHOD(call->data))) {
        IPC_SET_RETVAL(call->data, EFORWARD);
        ipc_answer(&TASK->answerbox, call);
        return EPERM;
    }
 
    /* Userspace is not allowed to change method of system methods
     * on forward, allow changing ARG1 and ARG2 by means of method and arg1
     */
    if (is_system_method(IPC_GET_METHOD(call->data))) {
        if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
            phone_dealloc(IPC_GET_ARG3(call->data));
 
        IPC_SET_ARG1(call->data, method);
        IPC_SET_ARG2(call->data, arg1);
    } else {
        IPC_SET_METHOD(call->data, method);
        IPC_SET_ARG1(call->data, arg1);
    }
 
    return ipc_forward(call, phone, &TASK->answerbox);
}
 
/** Send IPC answer */
__native sys_ipc_answer_fast(__native callid, __native retval,
                 __native arg1, __native arg2)
{
    call_t *call;
    ipc_data_t saved_data;
    int saveddata = 0;
    int rc;
 
    /* Do not answer notification callids */
    if (callid & IPC_CALLID_NOTIFICATION)
        return 0;
 
    call = get_call(callid);
    if (!call)
        return ENOENT;
 
    if (answer_need_old(call)) {
        memcpy(&saved_data, &call->data, sizeof(call->data));
        saveddata = 1;
    }
 
    IPC_SET_RETVAL(call->data, retval);
    IPC_SET_ARG1(call->data, arg1);
    IPC_SET_ARG2(call->data, arg2);
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
 
    ipc_answer(&TASK->answerbox, call);
    return rc;
}
 
/** Send IPC answer */
__native sys_ipc_answer(__native callid, ipc_data_t *data)
{
    call_t *call;
    ipc_data_t saved_data;
    int saveddata = 0;
    int rc;
 
    /* Do not answer notification callids */
    if (callid & IPC_CALLID_NOTIFICATION)
        return 0;
 
    call = get_call(callid);
    if (!call)
        return ENOENT;
 
    if (answer_need_old(call)) {
        memcpy(&saved_data, &call->data, sizeof(call->data));
        saveddata = 1;
    }
    rc = copy_from_uspace(&call->data.args, &data->args,
             sizeof(call->data.args));
    if (rc != 0)
        return rc;
 
    rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
   
    ipc_answer(&TASK->answerbox, call);
 
    return rc;
}
 
/** Hang up the phone
 *
 */
__native sys_ipc_hangup(int phoneid)
{
    phone_t *phone;
 
    GET_CHECK_PHONE(phone, phoneid, return ENOENT);
 
    if (ipc_phone_hangup(phone))
        return -1;
 
    return 0;
}
 
/** Wait for incoming ipc call or answer
 *
 * @param calldata Pointer to buffer where the call/answer data is stored
 * @param flags
 * @return Callid, if callid & 1, then the call is answer
 */
__native sys_ipc_wait_for_call(ipc_data_t *calldata, __native flags)
{
    call_t *call;
 
restart:   
    call = ipc_wait_for_call(&TASK->answerbox, flags);
    if (!call)
        return 0;
 
    if (call->flags & IPC_CALL_NOTIF) {
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
        STRUCT_TO_USPACE(&calldata->args, &call->data.args);
        ipc_call_free(call);
       
        return ((__native)call) | IPC_CALLID_NOTIFICATION;
    }
 
    if (call->flags & IPC_CALL_ANSWERED) {
        process_answer(call);
 
        ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
 
        atomic_dec(&TASK->active_calls);
 
        if (call->flags & IPC_CALL_DISCARD_ANSWER) {
            ipc_call_free(call);
            goto restart;
        }
 
        STRUCT_TO_USPACE(&calldata->args, &call->data.args);
        ipc_call_free(call);
 
        return ((__native)call) | IPC_CALLID_ANSWERED;
    }
 
    if (process_request(&TASK->answerbox, call))
        goto restart;
 
    /* Include phone address('id') of the caller in the request,
     * copy whole call->data, not only call->data.args */
    STRUCT_TO_USPACE(calldata, &call->data);
    return (__native)call;
}
 
/** Connect irq handler to task */
__native sys_ipc_register_irq(__native irq, irq_code_t *ucode)
{
    if (!(cap_get(TASK) & CAP_IRQ_REG))
        return EPERM;
 
    if (irq >= IRQ_COUNT)
        return (__native) ELIMIT;
 
    irq_ipc_bind_arch(irq);
 
    return ipc_irq_register(&TASK->answerbox, irq, ucode);
}
 
/* Disconnect irq handler from task */
__native sys_ipc_unregister_irq(__native irq)
{
    if (!(cap_get(TASK) & CAP_IRQ_REG))
        return EPERM;
 
    if (irq >= IRQ_COUNT)
        return (__native) ELIMIT;
 
    ipc_irq_unregister(&TASK->answerbox, irq);
 
    return 0;
}
 

Rev 1346	Rev 1359
1	/*	1	/*
2	* Copyright (C) 2006 Ondrej Palkovsky	2	* Copyright (C) 2006 Ondrej Palkovsky
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	#include <arch.h>	29	#include <arch.h>
30	#include <proc/task.h>	30	#include <proc/task.h>
31	#include <proc/thread.h>	31	#include <proc/thread.h>
32	#include <errno.h>	32	#include <errno.h>
33	#include <memstr.h>	33	#include <memstr.h>
34	#include <debug.h>	34	#include <debug.h>
35	#include <ipc/ipc.h>	35	#include <ipc/ipc.h>
36	#include <ipc/sysipc.h>	36	#include <ipc/sysipc.h>
37	#include <ipc/irq.h>	37	#include <ipc/irq.h>
38	#include <ipc/ipcrsc.h>	38	#include <ipc/ipcrsc.h>
39	#include <arch/interrupt.h>	39	#include <arch/interrupt.h>
40	#include <print.h>	40	#include <print.h>
41	#include <syscall/copy.h>	41	#include <syscall/copy.h>
42	#include <security/cap.h>	42	#include <security/cap.h>
43	#include <mm/as.h>	43	#include <mm/as.h>
44		44
45	#define GET_CHECK_PHONE(phone,phoneid,err) { \	45	#define GET_CHECK_PHONE(phone,phoneid,err) { \
46	if (phoneid > IPC_MAX_PHONES) { err; } \	46	if (phoneid > IPC_MAX_PHONES) { err; } \
47	phone = &TASK->phones[phoneid]; \	47	phone = &TASK->phones[phoneid]; \
48	}	48	}
49		49
50	#define STRUCT_TO_USPACE(dst,src) copy_to_uspace(dst,src,sizeof(*(src)))	50	#define STRUCT_TO_USPACE(dst,src) copy_to_uspace(dst,src,sizeof(*(src)))
51		51
52	/** Return true if the method is a system method */	52	/** Return true if the method is a system method */
53	static inline int is_system_method(__native method)	53	static inline int is_system_method(__native method)
54	{	54	{
55	if (method <= IPC_M_LAST_SYSTEM)	55	if (method <= IPC_M_LAST_SYSTEM)
56	return 1;	56	return 1;
57	return 0;	57	return 0;
58	}	58	}
59		59
60	/** Return true if the message with this method is forwardable	60	/** Return true if the message with this method is forwardable
61	*	61	*
62	* - some system messages may be forwarded, for some of them	62	* - some system messages may be forwarded, for some of them
63	* it is useless	63	* it is useless
64	*/	64	*/
65	static inline int is_forwardable(__native method)	65	static inline int is_forwardable(__native method)
66	{	66	{
67	if (method == IPC_M_PHONE_HUNGUP \|\| method == IPC_M_AS_SEND)	67	if (method == IPC_M_PHONE_HUNGUP \|\| method == IPC_M_AS_AREA_SEND)
68	return 0; /* This message is meant only for the receiver */	68	return 0; /* This message is meant only for the receiver */
69	return 1;	69	return 1;
70	}	70	}
71		71
72	/****************************************************/	72	/****************************************************/
73	/* Functions that preprocess answer before sending	73	/* Functions that preprocess answer before sending
74	* it to the recepient	74	* it to the recepient
75	*/	75	*/
76		76
77	/** Return true if the caller (ipc_answer) should save	77	/** Return true if the caller (ipc_answer) should save
78	* the old call contents for answer_preprocess	78	* the old call contents for answer_preprocess
79	*/	79	*/
80	static inline int answer_need_old(call_t *call)	80	static inline int answer_need_old(call_t *call)
81	{	81	{
82	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)	82	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
83	return 1;	83	return 1;
84	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)	84	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)
85	return 1;	85	return 1;
86	if (IPC_GET_METHOD(call->data) == IPC_M_AS_SEND)	86	if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_SEND)
87	return 1;	87	return 1;
88	return 0;	88	return 0;
89	}	89	}
90		90
91	/** Interpret process answer as control information */	91	/** Interpret process answer as control information */
92	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)	92	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)
93	{	93	{
94	int phoneid;	94	int phoneid;
95		95
96	if (IPC_GET_RETVAL(answer->data) == EHANGUP) {	96	if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
97	/* In case of forward, hangup the forwared phone,	97	/* In case of forward, hangup the forwared phone,
98	* not the originator	98	* not the originator
99	*/	99	*/
100	spinlock_lock(&answer->data.phone->lock);	100	spinlock_lock(&answer->data.phone->lock);
101	spinlock_lock(&TASK->answerbox.lock);	101	spinlock_lock(&TASK->answerbox.lock);
102	if (answer->data.phone->callee) {	102	if (answer->data.phone->callee) {
103	list_remove(&answer->data.phone->list);	103	list_remove(&answer->data.phone->list);
104	answer->data.phone->callee = 0;	104	answer->data.phone->callee = 0;
105	}	105	}
106	spinlock_unlock(&TASK->answerbox.lock);	106	spinlock_unlock(&TASK->answerbox.lock);
107	spinlock_unlock(&answer->data.phone->lock);	107	spinlock_unlock(&answer->data.phone->lock);
108	}	108	}
109		109
110	if (!olddata)	110	if (!olddata)
111	return 0;	111	return 0;
112		112
113	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {	113	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
114	phoneid = IPC_GET_ARG3(*olddata);	114	phoneid = IPC_GET_ARG3(*olddata);
115	if (IPC_GET_RETVAL(answer->data)) {	115	if (IPC_GET_RETVAL(answer->data)) {
116	/* The connection was not accepted */	116	/* The connection was not accepted */
117	phone_dealloc(phoneid);	117	phone_dealloc(phoneid);
118	} else {	118	} else {
119	/* The connection was accepted */	119	/* The connection was accepted */
120	phone_connect(phoneid,&answer->sender->answerbox);	120	phone_connect(phoneid,&answer->sender->answerbox);
121	/* Set 'phone identification' as arg3 of response */	121	/* Set 'phone identification' as arg3 of response */
122	IPC_SET_ARG3(answer->data, (__native)&TASK->phones[phoneid]);	122	IPC_SET_ARG3(answer->data, (__native)&TASK->phones[phoneid]);
123	}	123	}
124	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {	124	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
125	/* If the users accepted call, connect */	125	/* If the users accepted call, connect */
126	if (!IPC_GET_RETVAL(answer->data)) {	126	if (!IPC_GET_RETVAL(answer->data)) {
127	ipc_phone_connect((phone_t )IPC_GET_ARG3(olddata),	127	ipc_phone_connect((phone_t )IPC_GET_ARG3(olddata),
128	&TASK->answerbox);	128	&TASK->answerbox);
129	}	129	}
130	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_SEND) {	130	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
131	if (!IPC_GET_RETVAL(answer->data)) { /* Accepted, handle As_area receival */	131	if (!IPC_GET_RETVAL(answer->data)) { /* Accepted, handle as_area receipt */
132	return as_area_steal(answer->sender,	132	return as_area_steal(answer->sender,
133	IPC_GET_ARG2(olddata),IPC_GET_ARG3(olddata),	133	IPC_GET_ARG2(olddata),IPC_GET_ARG3(olddata),
134	IPC_GET_ARG1(answer->data));	134	IPC_GET_ARG1(answer->data));
135	}	135	}
136	}	136	}
137	return 0;	137	return 0;
138	}	138	}
139		139
140	/** Called before the request is sent	140	/** Called before the request is sent
141	*	141	*
142	* @return 0 - no error, -1 - report error to user	142	* @return 0 - no error, -1 - report error to user
143	*/	143	*/
144	static int request_preprocess(call_t *call)	144	static int request_preprocess(call_t *call)
145	{	145	{
146	int newphid;	146	int newphid;
147	size_t size;	147	size_t size;
148		148
149	switch (IPC_GET_METHOD(call->data)) {	149	switch (IPC_GET_METHOD(call->data)) {
150	case IPC_M_CONNECT_ME_TO:	150	case IPC_M_CONNECT_ME_TO:
151	newphid = phone_alloc();	151	newphid = phone_alloc();
152	if (newphid < 0)	152	if (newphid < 0)
153	return ELIMIT;	153	return ELIMIT;
154	/* Set arg3 for server */	154	/* Set arg3 for server */
155	IPC_SET_ARG3(call->data, (__native)&TASK->phones[newphid]);	155	IPC_SET_ARG3(call->data, (__native)&TASK->phones[newphid]);
156	call->flags \|= IPC_CALL_CONN_ME_TO;	156	call->flags \|= IPC_CALL_CONN_ME_TO;
157	call->private = newphid;	157	call->private = newphid;
158	break;	158	break;
159	case IPC_M_AS_SEND:	159	case IPC_M_AS_AREA_SEND:
160	size = as_get_size(IPC_GET_ARG2(call->data));	160	size = as_get_size(IPC_GET_ARG2(call->data));
161	if (!size) {	161	if (!size) {
162	return EPERM;	162	return EPERM;
163	}	163	}
164	IPC_SET_ARG3(call->data, size);	164	IPC_SET_ARG3(call->data, size);
165	break;	165	break;
166	default:	166	default:
167	break;	167	break;
168	}	168	}
169	return 0;	169	return 0;
170	}	170	}
171		171
172	/****************************************************/	172	/****************************************************/
173	/* Functions called to process received call/answer	173	/* Functions called to process received call/answer
174	* before passing to uspace	174	* before passing to uspace
175	*/	175	*/
176		176
177	/** Do basic kernel processing of received call answer */	177	/** Do basic kernel processing of received call answer */
178	static void process_answer(call_t *call)	178	static void process_answer(call_t *call)
179	{	179	{
180	if (IPC_GET_RETVAL(call->data) == EHANGUP && \	180	if (IPC_GET_RETVAL(call->data) == EHANGUP && \
181	call->flags & IPC_CALL_FORWARDED)	181	call->flags & IPC_CALL_FORWARDED)
182	IPC_SET_RETVAL(call->data, EFORWARD);	182	IPC_SET_RETVAL(call->data, EFORWARD);
183		183
184	if (call->flags & IPC_CALL_CONN_ME_TO) {	184	if (call->flags & IPC_CALL_CONN_ME_TO) {
185	if (IPC_GET_RETVAL(call->data))	185	if (IPC_GET_RETVAL(call->data))
186	phone_dealloc(call->private);	186	phone_dealloc(call->private);
187	else	187	else
188	IPC_SET_ARG3(call->data, call->private);	188	IPC_SET_ARG3(call->data, call->private);
189	}	189	}
190	}	190	}
191		191
192	/** Do basic kernel processing of received call request	192	/** Do basic kernel processing of received call request
193	*	193	*
194	* @return 0 - the call should be passed to userspace, 1 - ignore call	194	* @return 0 - the call should be passed to userspace, 1 - ignore call
195	*/	195	*/
196	static int process_request(answerbox_t box,call_t call)	196	static int process_request(answerbox_t box,call_t call)
197	{	197	{
198	int phoneid;	198	int phoneid;
199		199
200	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {	200	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
201	phoneid = phone_alloc();	201	phoneid = phone_alloc();
202	if (phoneid < 0) { /* Failed to allocate phone */	202	if (phoneid < 0) { /* Failed to allocate phone */
203	IPC_SET_RETVAL(call->data, ELIMIT);	203	IPC_SET_RETVAL(call->data, ELIMIT);
204	ipc_answer(box,call);	204	ipc_answer(box,call);
205	return -1;	205	return -1;
206	}	206	}
207	IPC_SET_ARG3(call->data, phoneid);	207	IPC_SET_ARG3(call->data, phoneid);
208	}	208	}
209	return 0;	209	return 0;
210	}	210	}
211		211
212	/** Send a call over IPC, wait for reply, return to user	212	/** Send a call over IPC, wait for reply, return to user
213	*	213	*
214	* @return Call identification, returns -1 on fatal error,	214	* @return Call identification, returns -1 on fatal error,
215	-2 on 'Too many async request, handle answers first	215	-2 on 'Too many async request, handle answers first
216	*/	216	*/
217	__native sys_ipc_call_sync_fast(__native phoneid, __native method,	217	__native sys_ipc_call_sync_fast(__native phoneid, __native method,
218	__native arg1, ipc_data_t *data)	218	__native arg1, ipc_data_t *data)
219	{	219	{
220	call_t call;	220	call_t call;
221	phone_t *phone;	221	phone_t *phone;
222	int res;	222	int res;
223		223
224	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	224	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
225		225
226	ipc_call_static_init(&call);	226	ipc_call_static_init(&call);
227	IPC_SET_METHOD(call.data, method);	227	IPC_SET_METHOD(call.data, method);
228	IPC_SET_ARG1(call.data, arg1);	228	IPC_SET_ARG1(call.data, arg1);
229		229
230	if (!(res=request_preprocess(&call))) {	230	if (!(res=request_preprocess(&call))) {
231	ipc_call_sync(phone, &call);	231	ipc_call_sync(phone, &call);
232	process_answer(&call);	232	process_answer(&call);
233	} else	233	} else
234	IPC_SET_RETVAL(call.data, res);	234	IPC_SET_RETVAL(call.data, res);
235	STRUCT_TO_USPACE(&data->args, &call.data.args);	235	STRUCT_TO_USPACE(&data->args, &call.data.args);
236		236
237	return 0;	237	return 0;
238	}	238	}
239		239
240	/** Synchronous IPC call allowing to send whole message */	240	/** Synchronous IPC call allowing to send whole message */
241	__native sys_ipc_call_sync(__native phoneid, ipc_data_t *question,	241	__native sys_ipc_call_sync(__native phoneid, ipc_data_t *question,
242	ipc_data_t *reply)	242	ipc_data_t *reply)
243	{	243	{
244	call_t call;	244	call_t call;
245	phone_t *phone;	245	phone_t *phone;
246	int res;	246	int res;
247	int rc;	247	int rc;
248		248
249	ipc_call_static_init(&call);	249	ipc_call_static_init(&call);
250	rc = copy_from_uspace(&call.data.args, &question->args, sizeof(call.data.args));	250	rc = copy_from_uspace(&call.data.args, &question->args, sizeof(call.data.args));
251	if (rc != 0)	251	if (rc != 0)
252	return (__native) rc;	252	return (__native) rc;
253		253
254	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	254	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
255		255
256	if (!(res=request_preprocess(&call))) {	256	if (!(res=request_preprocess(&call))) {
257	ipc_call_sync(phone, &call);	257	ipc_call_sync(phone, &call);
258	process_answer(&call);	258	process_answer(&call);
259	} else	259	} else
260	IPC_SET_RETVAL(call.data, res);	260	IPC_SET_RETVAL(call.data, res);
261		261
262	rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);	262	rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
263	if (rc != 0)	263	if (rc != 0)
264	return rc;	264	return rc;
265		265
266	return 0;	266	return 0;
267	}	267	}
268		268
269	/** Check that the task did not exceed allowed limit	269	/** Check that the task did not exceed allowed limit
270	*	270	*
271	* @return 0 - Limit OK, -1 - limit exceeded	271	* @return 0 - Limit OK, -1 - limit exceeded
272	*/	272	*/
273	static int check_call_limit(void)	273	static int check_call_limit(void)
274	{	274	{
275	if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {	275	if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
276	atomic_dec(&TASK->active_calls);	276	atomic_dec(&TASK->active_calls);
277	return -1;	277	return -1;
278	}	278	}
279	return 0;	279	return 0;
280	}	280	}
281		281
282	/** Send an asynchronous call over ipc	282	/** Send an asynchronous call over ipc
283	*	283	*
284	* @return Call identification, returns -1 on fatal error,	284	* @return Call identification, returns -1 on fatal error,
285	-2 on 'Too many async request, handle answers first	285	-2 on 'Too many async request, handle answers first
286	*/	286	*/
287	__native sys_ipc_call_async_fast(__native phoneid, __native method,	287	__native sys_ipc_call_async_fast(__native phoneid, __native method,
288	__native arg1, __native arg2)	288	__native arg1, __native arg2)
289	{	289	{
290	call_t *call;	290	call_t *call;
291	phone_t *phone;	291	phone_t *phone;
292	int res;	292	int res;
293		293
294	if (check_call_limit())	294	if (check_call_limit())
295	return IPC_CALLRET_TEMPORARY;	295	return IPC_CALLRET_TEMPORARY;
296		296
297	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);	297	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
298		298
299	call = ipc_call_alloc(0);	299	call = ipc_call_alloc(0);
300	IPC_SET_METHOD(call->data, method);	300	IPC_SET_METHOD(call->data, method);
301	IPC_SET_ARG1(call->data, arg1);	301	IPC_SET_ARG1(call->data, arg1);
302	IPC_SET_ARG2(call->data, arg2);	302	IPC_SET_ARG2(call->data, arg2);
303		303
304	if (!(res=request_preprocess(call)))	304	if (!(res=request_preprocess(call)))
305	ipc_call(phone, call);	305	ipc_call(phone, call);
306	else	306	else
307	ipc_backsend_err(phone, call, res);	307	ipc_backsend_err(phone, call, res);
308		308
309	return (__native) call;	309	return (__native) call;
310	}	310	}
311		311
312	/** Synchronous IPC call allowing to send whole message	312	/** Synchronous IPC call allowing to send whole message
313	*	313	*
314	* @return The same as sys_ipc_call_async	314	* @return The same as sys_ipc_call_async
315	*/	315	*/
316	__native sys_ipc_call_async(__native phoneid, ipc_data_t *data)	316	__native sys_ipc_call_async(__native phoneid, ipc_data_t *data)
317	{	317	{
318	call_t *call;	318	call_t *call;
319	phone_t *phone;	319	phone_t *phone;
320	int res;	320	int res;
321	int rc;	321	int rc;
322		322
323	if (check_call_limit())	323	if (check_call_limit())
324	return IPC_CALLRET_TEMPORARY;	324	return IPC_CALLRET_TEMPORARY;
325		325
326	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);	326	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
327		327
328	call = ipc_call_alloc(0);	328	call = ipc_call_alloc(0);
329	rc = copy_from_uspace(&call->data.args, &data->args, sizeof(call->data.args));	329	rc = copy_from_uspace(&call->data.args, &data->args, sizeof(call->data.args));
330	if (rc != 0) {	330	if (rc != 0) {
331	ipc_call_free(call);	331	ipc_call_free(call);
332	return (__native) rc;	332	return (__native) rc;
333	}	333	}
334	if (!(res=request_preprocess(call)))	334	if (!(res=request_preprocess(call)))
335	ipc_call(phone, call);	335	ipc_call(phone, call);
336	else	336	else
337	ipc_backsend_err(phone, call, res);	337	ipc_backsend_err(phone, call, res);
338		338
339	return (__native) call;	339	return (__native) call;
340	}	340	}
341		341
342	/** Forward received call to another destination	342	/** Forward received call to another destination
343	*	343	*
344	* The arg1 and arg2 are changed in the forwarded message	344	* The arg1 and arg2 are changed in the forwarded message
345	*	345	*
346	* Warning: If implementing non-fast version, make sure that	346	* Warning: If implementing non-fast version, make sure that
347	* arg3 is not rewritten for certain system IPC	347	* arg3 is not rewritten for certain system IPC
348	*/	348	*/
349	__native sys_ipc_forward_fast(__native callid, __native phoneid,	349	__native sys_ipc_forward_fast(__native callid, __native phoneid,
350	__native method, __native arg1)	350	__native method, __native arg1)
351	{	351	{
352	call_t *call;	352	call_t *call;
353	phone_t *phone;	353	phone_t *phone;
354		354
355	call = get_call(callid);	355	call = get_call(callid);
356	if (!call)	356	if (!call)
357	return ENOENT;	357	return ENOENT;
358		358
359	call->flags \|= IPC_CALL_FORWARDED;	359	call->flags \|= IPC_CALL_FORWARDED;
360		360
361	GET_CHECK_PHONE(phone, phoneid, {	361	GET_CHECK_PHONE(phone, phoneid, {
362	IPC_SET_RETVAL(call->data, EFORWARD);	362	IPC_SET_RETVAL(call->data, EFORWARD);
363	ipc_answer(&TASK->answerbox, call);	363	ipc_answer(&TASK->answerbox, call);
364	return ENOENT;	364	return ENOENT;
365	});	365	});
366		366
367	if (!is_forwardable(IPC_GET_METHOD(call->data))) {	367	if (!is_forwardable(IPC_GET_METHOD(call->data))) {
368	IPC_SET_RETVAL(call->data, EFORWARD);	368	IPC_SET_RETVAL(call->data, EFORWARD);
369	ipc_answer(&TASK->answerbox, call);	369	ipc_answer(&TASK->answerbox, call);
370	return EPERM;	370	return EPERM;
371	}	371	}
372		372
373	/* Userspace is not allowed to change method of system methods	373	/* Userspace is not allowed to change method of system methods
374	* on forward, allow changing ARG1 and ARG2 by means of method and arg1	374	* on forward, allow changing ARG1 and ARG2 by means of method and arg1
375	*/	375	*/
376	if (is_system_method(IPC_GET_METHOD(call->data))) {	376	if (is_system_method(IPC_GET_METHOD(call->data))) {
377	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)	377	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
378	phone_dealloc(IPC_GET_ARG3(call->data));	378	phone_dealloc(IPC_GET_ARG3(call->data));
379		379
380	IPC_SET_ARG1(call->data, method);	380	IPC_SET_ARG1(call->data, method);
381	IPC_SET_ARG2(call->data, arg1);	381	IPC_SET_ARG2(call->data, arg1);
382	} else {	382	} else {
383	IPC_SET_METHOD(call->data, method);	383	IPC_SET_METHOD(call->data, method);
384	IPC_SET_ARG1(call->data, arg1);	384	IPC_SET_ARG1(call->data, arg1);
385	}	385	}
386		386
387	return ipc_forward(call, phone, &TASK->answerbox);	387	return ipc_forward(call, phone, &TASK->answerbox);
388	}	388	}
389		389
390	/** Send IPC answer */	390	/** Send IPC answer */
391	__native sys_ipc_answer_fast(__native callid, __native retval,	391	__native sys_ipc_answer_fast(__native callid, __native retval,
392	__native arg1, __native arg2)	392	__native arg1, __native arg2)
393	{	393	{
394	call_t *call;	394	call_t *call;
395	ipc_data_t saved_data;	395	ipc_data_t saved_data;
396	int saveddata = 0;	396	int saveddata = 0;
397	int rc;	397	int rc;
398		398
399	/* Do not answer notification callids */	399	/* Do not answer notification callids */
400	if (callid & IPC_CALLID_NOTIFICATION)	400	if (callid & IPC_CALLID_NOTIFICATION)
401	return 0;	401	return 0;
402		402
403	call = get_call(callid);	403	call = get_call(callid);
404	if (!call)	404	if (!call)
405	return ENOENT;	405	return ENOENT;
406		406
407	if (answer_need_old(call)) {	407	if (answer_need_old(call)) {
408	memcpy(&saved_data, &call->data, sizeof(call->data));	408	memcpy(&saved_data, &call->data, sizeof(call->data));
409	saveddata = 1;	409	saveddata = 1;
410	}	410	}
411		411
412	IPC_SET_RETVAL(call->data, retval);	412	IPC_SET_RETVAL(call->data, retval);
413	IPC_SET_ARG1(call->data, arg1);	413	IPC_SET_ARG1(call->data, arg1);
414	IPC_SET_ARG2(call->data, arg2);	414	IPC_SET_ARG2(call->data, arg2);
415	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);	415	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
416		416
417	ipc_answer(&TASK->answerbox, call);	417	ipc_answer(&TASK->answerbox, call);
418	return rc;	418	return rc;
419	}	419	}
420		420
421	/** Send IPC answer */	421	/** Send IPC answer */
422	__native sys_ipc_answer(__native callid, ipc_data_t *data)	422	__native sys_ipc_answer(__native callid, ipc_data_t *data)
423	{	423	{
424	call_t *call;	424	call_t *call;
425	ipc_data_t saved_data;	425	ipc_data_t saved_data;
426	int saveddata = 0;	426	int saveddata = 0;
427	int rc;	427	int rc;
428		428
429	/* Do not answer notification callids */	429	/* Do not answer notification callids */
430	if (callid & IPC_CALLID_NOTIFICATION)	430	if (callid & IPC_CALLID_NOTIFICATION)
431	return 0;	431	return 0;
432		432
433	call = get_call(callid);	433	call = get_call(callid);
434	if (!call)	434	if (!call)
435	return ENOENT;	435	return ENOENT;
436		436
437	if (answer_need_old(call)) {	437	if (answer_need_old(call)) {
438	memcpy(&saved_data, &call->data, sizeof(call->data));	438	memcpy(&saved_data, &call->data, sizeof(call->data));
439	saveddata = 1;	439	saveddata = 1;
440	}	440	}
441	rc = copy_from_uspace(&call->data.args, &data->args,	441	rc = copy_from_uspace(&call->data.args, &data->args,
442	sizeof(call->data.args));	442	sizeof(call->data.args));
443	if (rc != 0)	443	if (rc != 0)
444	return rc;	444	return rc;
445		445
446	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);	446	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
447		447
448	ipc_answer(&TASK->answerbox, call);	448	ipc_answer(&TASK->answerbox, call);
449		449
450	return rc;	450	return rc;
451	}	451	}
452		452
453	/** Hang up the phone	453	/** Hang up the phone
454	*	454	*
455	*/	455	*/
456	__native sys_ipc_hangup(int phoneid)	456	__native sys_ipc_hangup(int phoneid)
457	{	457	{
458	phone_t *phone;	458	phone_t *phone;
459		459
460	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	460	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
461		461
462	if (ipc_phone_hangup(phone))	462	if (ipc_phone_hangup(phone))
463	return -1;	463	return -1;
464		464
465	return 0;	465	return 0;
466	}	466	}
467		467
468	/** Wait for incoming ipc call or answer	468	/** Wait for incoming ipc call or answer
469	*	469	*
470	* @param calldata Pointer to buffer where the call/answer data is stored	470	* @param calldata Pointer to buffer where the call/answer data is stored
471	* @param flags	471	* @param flags
472	* @return Callid, if callid & 1, then the call is answer	472	* @return Callid, if callid & 1, then the call is answer
473	*/	473	*/
474	__native sys_ipc_wait_for_call(ipc_data_t *calldata, __native flags)	474	__native sys_ipc_wait_for_call(ipc_data_t *calldata, __native flags)
475	{	475	{
476	call_t *call;	476	call_t *call;
477		477
478	restart:	478	restart:
479	call = ipc_wait_for_call(&TASK->answerbox, flags);	479	call = ipc_wait_for_call(&TASK->answerbox, flags);
480	if (!call)	480	if (!call)
481	return 0;	481	return 0;
482		482
483	if (call->flags & IPC_CALL_NOTIF) {	483	if (call->flags & IPC_CALL_NOTIF) {
484	ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));	484	ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
485	STRUCT_TO_USPACE(&calldata->args, &call->data.args);	485	STRUCT_TO_USPACE(&calldata->args, &call->data.args);
486	ipc_call_free(call);	486	ipc_call_free(call);
487		487
488	return ((__native)call) \| IPC_CALLID_NOTIFICATION;	488	return ((__native)call) \| IPC_CALLID_NOTIFICATION;
489	}	489	}
490		490
491	if (call->flags & IPC_CALL_ANSWERED) {	491	if (call->flags & IPC_CALL_ANSWERED) {
492	process_answer(call);	492	process_answer(call);
493		493
494	ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));	494	ASSERT(! (call->flags & IPC_CALL_STATIC_ALLOC));
495		495
496	atomic_dec(&TASK->active_calls);	496	atomic_dec(&TASK->active_calls);
497		497
498	if (call->flags & IPC_CALL_DISCARD_ANSWER) {	498	if (call->flags & IPC_CALL_DISCARD_ANSWER) {
499	ipc_call_free(call);	499	ipc_call_free(call);
500	goto restart;	500	goto restart;

Subversion Repositories HelenOS

(root)/branches/dynload/kernel/generic/src/ipc/sysipc.c @ 3474 – Rev 1346 → 1359