WebSVN – HelenOS-historic – Diff – /kernel/trunk/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 \
        || method == IPC_M_AS_AREA_RECV)
        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;
    if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_RECV)
        return 1;
    return 0;
}
 
/** Interpret process answer as control information
 *
 * This function is called directly after sys_ipc_answer
 */
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 */
            ipl_t ipl;
            as_t *as;
           
            ipl = interrupts_disable();
            spinlock_lock(&answer->sender->lock);
            as = answer->sender->as;
            spinlock_unlock(&answer->sender->lock);
            interrupts_restore(ipl);
           
            return as_area_share(as, IPC_GET_ARG1(*olddata), IPC_GET_ARG2(*olddata),
                         AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
        }
    } else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {
        if (!IPC_GET_RETVAL(answer->data)) {
            ipl_t ipl;
            as_t *as;
            int rc;
           
            ipl = interrupts_disable();
            spinlock_lock(&answer->sender->lock);
            as = answer->sender->as;
            spinlock_unlock(&answer->sender->lock);
            interrupts_restore(ipl);
           
            rc = as_area_share(AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG2(*olddata),
                       as, IPC_GET_ARG1(*olddata), IPC_GET_ARG3(*olddata));
            IPC_SET_RETVAL(answer->data, rc);
        }
    }
    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_ARG1(call->data));
        if (!size) {
            return EPERM;
        }
        IPC_SET_ARG2(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 usec Timeout. See waitq_sleep_timeout() for explanation.
 * @param nonblocking See waitq_sleep_timeout() for explanation.
 *
 * @return Callid, if callid & 1, then the call is answer
 */
__native sys_ipc_wait_for_call(ipc_data_t *calldata, __u32 usec, int nonblocking)
{
    call_t *call;
 
restart:   
    call = ipc_wait_for_call(&TASK->answerbox, usec, nonblocking);
    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 */
    if (STRUCT_TO_USPACE(calldata, &call->data)) {
        return 0;
    }
    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 1428	Rev 1434
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_AREA_SEND \	67	if (method == IPC_M_PHONE_HUNGUP \|\| method == IPC_M_AS_AREA_SEND \
68	\|\| method == IPC_M_AS_AREA_RECV)	68	\|\| method == IPC_M_AS_AREA_RECV)
69	return 0; /* This message is meant only for the receiver */	69	return 0; /* This message is meant only for the receiver */
70	return 1;	70	return 1;
71	}	71	}
72		72
73	/****************************************************/	73	/****************************************************/
74	/* Functions that preprocess answer before sending	74	/* Functions that preprocess answer before sending
75	* it to the recepient	75	* it to the recepient
76	*/	76	*/
77		77
78	/** Return true if the caller (ipc_answer) should save	78	/** Return true if the caller (ipc_answer) should save
79	* the old call contents for answer_preprocess	79	* the old call contents for answer_preprocess
80	*/	80	*/
81	static inline int answer_need_old(call_t *call)	81	static inline int answer_need_old(call_t *call)
82	{	82	{
83	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)	83	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
84	return 1;	84	return 1;
85	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)	85	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_ME_TO)
86	return 1;	86	return 1;
87	if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_SEND)	87	if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_SEND)
88	return 1;	88	return 1;
89	if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_RECV)	89	if (IPC_GET_METHOD(call->data) == IPC_M_AS_AREA_RECV)
90	return 1;	90	return 1;
91	return 0;	91	return 0;
92	}	92	}
93		93
94	/** Interpret process answer as control information	94	/** Interpret process answer as control information
95	*	95	*
96	* This function is called directly after sys_ipc_answer	96	* This function is called directly after sys_ipc_answer
97	*/	97	*/
98	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)	98	static inline int answer_preprocess(call_t answer, ipc_data_t olddata)
99	{	99	{
100	int phoneid;	100	int phoneid;
101		101
102	if (IPC_GET_RETVAL(answer->data) == EHANGUP) {	102	if (IPC_GET_RETVAL(answer->data) == EHANGUP) {
103	/* In case of forward, hangup the forwared phone,	103	/* In case of forward, hangup the forwared phone,
104	* not the originator	104	* not the originator
105	*/	105	*/
106	spinlock_lock(&answer->data.phone->lock);	106	spinlock_lock(&answer->data.phone->lock);
107	spinlock_lock(&TASK->answerbox.lock);	107	spinlock_lock(&TASK->answerbox.lock);
108	if (answer->data.phone->callee) {	108	if (answer->data.phone->callee) {
109	list_remove(&answer->data.phone->list);	109	list_remove(&answer->data.phone->list);
110	answer->data.phone->callee = 0;	110	answer->data.phone->callee = 0;
111	}	111	}
112	spinlock_unlock(&TASK->answerbox.lock);	112	spinlock_unlock(&TASK->answerbox.lock);
113	spinlock_unlock(&answer->data.phone->lock);	113	spinlock_unlock(&answer->data.phone->lock);
114	}	114	}
115		115
116	if (!olddata)	116	if (!olddata)
117	return 0;	117	return 0;
118		118
119	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {	119	if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_TO_ME) {
120	phoneid = IPC_GET_ARG3(*olddata);	120	phoneid = IPC_GET_ARG3(*olddata);
121	if (IPC_GET_RETVAL(answer->data)) {	121	if (IPC_GET_RETVAL(answer->data)) {
122	/* The connection was not accepted */	122	/* The connection was not accepted */
123	phone_dealloc(phoneid);	123	phone_dealloc(phoneid);
124	} else {	124	} else {
125	/* The connection was accepted */	125	/* The connection was accepted */
126	phone_connect(phoneid,&answer->sender->answerbox);	126	phone_connect(phoneid,&answer->sender->answerbox);
127	/* Set 'phone identification' as arg3 of response */	127	/* Set 'phone identification' as arg3 of response */
128	IPC_SET_ARG3(answer->data, (__native)&TASK->phones[phoneid]);	128	IPC_SET_ARG3(answer->data, (__native)&TASK->phones[phoneid]);
129	}	129	}
130	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {	130	} else if (IPC_GET_METHOD(*olddata) == IPC_M_CONNECT_ME_TO) {
131	/* If the users accepted call, connect */	131	/* If the users accepted call, connect */
132	if (!IPC_GET_RETVAL(answer->data)) {	132	if (!IPC_GET_RETVAL(answer->data)) {
133	ipc_phone_connect((phone_t )IPC_GET_ARG3(olddata),	133	ipc_phone_connect((phone_t )IPC_GET_ARG3(olddata),
134	&TASK->answerbox);	134	&TASK->answerbox);
135	}	135	}
136	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {	136	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_SEND) {
137	if (!IPC_GET_RETVAL(answer->data)) { /* Accepted, handle as_area receipt */	137	if (!IPC_GET_RETVAL(answer->data)) { /* Accepted, handle as_area receipt */
138	ipl_t ipl;	138	ipl_t ipl;
139	as_t *as;	139	as_t *as;
140		140
141	ipl = interrupts_disable();	141	ipl = interrupts_disable();
142	spinlock_lock(&answer->sender->lock);	142	spinlock_lock(&answer->sender->lock);
143	as = answer->sender->as;	143	as = answer->sender->as;
144	spinlock_unlock(&answer->sender->lock);	144	spinlock_unlock(&answer->sender->lock);
145	interrupts_restore(ipl);	145	interrupts_restore(ipl);
146		146
147	return as_area_share(as, IPC_GET_ARG1(olddata), IPC_GET_ARG2(olddata),	147	return as_area_share(as, IPC_GET_ARG1(olddata), IPC_GET_ARG2(olddata),
148	AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));	148	AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG3(*olddata));
149	}	149	}
150	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {	150	} else if (IPC_GET_METHOD(*olddata) == IPC_M_AS_AREA_RECV) {
151	if (!IPC_GET_RETVAL(answer->data)) {	151	if (!IPC_GET_RETVAL(answer->data)) {
152	ipl_t ipl;	152	ipl_t ipl;
153	as_t *as;	153	as_t *as;
-		154	int rc;
154		155
155	ipl = interrupts_disable();	156	ipl = interrupts_disable();
156	spinlock_lock(&answer->sender->lock);	157	spinlock_lock(&answer->sender->lock);
157	as = answer->sender->as;	158	as = answer->sender->as;
158	spinlock_unlock(&answer->sender->lock);	159	spinlock_unlock(&answer->sender->lock);
159	interrupts_restore(ipl);	160	interrupts_restore(ipl);
160		161
161	return as_area_share(AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG2(*olddata),	162	rc = as_area_share(AS, IPC_GET_ARG1(answer->data), IPC_GET_ARG2(*olddata),
162	as, IPC_GET_ARG1(olddata), IPC_GET_ARG3(olddata));	163	as, IPC_GET_ARG1(olddata), IPC_GET_ARG3(olddata));
-		164	IPC_SET_RETVAL(answer->data, rc);
163	}	165	}
164	}	166	}
165	return 0;	167	return 0;
166	}	168	}
167		169
168	/** Called before the request is sent	170	/** Called before the request is sent
169	*	171	*
170	* @return 0 - no error, -1 - report error to user	172	* @return 0 - no error, -1 - report error to user
171	*/	173	*/
172	static int request_preprocess(call_t *call)	174	static int request_preprocess(call_t *call)
173	{	175	{
174	int newphid;	176	int newphid;
175	size_t size;	177	size_t size;
176		178
177	switch (IPC_GET_METHOD(call->data)) {	179	switch (IPC_GET_METHOD(call->data)) {
178	case IPC_M_CONNECT_ME_TO:	180	case IPC_M_CONNECT_ME_TO:
179	newphid = phone_alloc();	181	newphid = phone_alloc();
180	if (newphid < 0)	182	if (newphid < 0)
181	return ELIMIT;	183	return ELIMIT;
182	/* Set arg3 for server */	184	/* Set arg3 for server */
183	IPC_SET_ARG3(call->data, (__native)&TASK->phones[newphid]);	185	IPC_SET_ARG3(call->data, (__native)&TASK->phones[newphid]);
184	call->flags \|= IPC_CALL_CONN_ME_TO;	186	call->flags \|= IPC_CALL_CONN_ME_TO;
185	call->private = newphid;	187	call->private = newphid;
186	break;	188	break;
187	case IPC_M_AS_AREA_SEND:	189	case IPC_M_AS_AREA_SEND:
188	size = as_get_size(IPC_GET_ARG1(call->data));	190	size = as_get_size(IPC_GET_ARG1(call->data));
189	if (!size) {	191	if (!size) {
190	return EPERM;	192	return EPERM;
191	}	193	}
192	IPC_SET_ARG2(call->data, size);	194	IPC_SET_ARG2(call->data, size);
193	break;	195	break;
194	default:	196	default:
195	break;	197	break;
196	}	198	}
197	return 0;	199	return 0;
198	}	200	}
199		201
200	/****************************************************/	202	/****************************************************/
201	/* Functions called to process received call/answer	203	/* Functions called to process received call/answer
202	* before passing to uspace	204	* before passing to uspace
203	*/	205	*/
204		206
205	/** Do basic kernel processing of received call answer */	207	/** Do basic kernel processing of received call answer */
206	static void process_answer(call_t *call)	208	static void process_answer(call_t *call)
207	{	209	{
208	if (IPC_GET_RETVAL(call->data) == EHANGUP && \	210	if (IPC_GET_RETVAL(call->data) == EHANGUP && \
209	call->flags & IPC_CALL_FORWARDED)	211	call->flags & IPC_CALL_FORWARDED)
210	IPC_SET_RETVAL(call->data, EFORWARD);	212	IPC_SET_RETVAL(call->data, EFORWARD);
211		213
212	if (call->flags & IPC_CALL_CONN_ME_TO) {	214	if (call->flags & IPC_CALL_CONN_ME_TO) {
213	if (IPC_GET_RETVAL(call->data))	215	if (IPC_GET_RETVAL(call->data))
214	phone_dealloc(call->private);	216	phone_dealloc(call->private);
215	else	217	else
216	IPC_SET_ARG3(call->data, call->private);	218	IPC_SET_ARG3(call->data, call->private);
217	}	219	}
218	}	220	}
219		221
220	/** Do basic kernel processing of received call request	222	/** Do basic kernel processing of received call request
221	*	223	*
222	* @return 0 - the call should be passed to userspace, 1 - ignore call	224	* @return 0 - the call should be passed to userspace, 1 - ignore call
223	*/	225	*/
224	static int process_request(answerbox_t box,call_t call)	226	static int process_request(answerbox_t box,call_t call)
225	{	227	{
226	int phoneid;	228	int phoneid;
227		229
228	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {	230	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME) {
229	phoneid = phone_alloc();	231	phoneid = phone_alloc();
230	if (phoneid < 0) { /* Failed to allocate phone */	232	if (phoneid < 0) { /* Failed to allocate phone */
231	IPC_SET_RETVAL(call->data, ELIMIT);	233	IPC_SET_RETVAL(call->data, ELIMIT);
232	ipc_answer(box,call);	234	ipc_answer(box,call);
233	return -1;	235	return -1;
234	}	236	}
235	IPC_SET_ARG3(call->data, phoneid);	237	IPC_SET_ARG3(call->data, phoneid);
236	}	238	}
237	return 0;	239	return 0;
238	}	240	}
239		241
240	/** Send a call over IPC, wait for reply, return to user	242	/** Send a call over IPC, wait for reply, return to user
241	*	243	*
242	* @return Call identification, returns -1 on fatal error,	244	* @return Call identification, returns -1 on fatal error,
243	-2 on 'Too many async request, handle answers first	245	-2 on 'Too many async request, handle answers first
244	*/	246	*/
245	__native sys_ipc_call_sync_fast(__native phoneid, __native method,	247	__native sys_ipc_call_sync_fast(__native phoneid, __native method,
246	__native arg1, ipc_data_t *data)	248	__native arg1, ipc_data_t *data)
247	{	249	{
248	call_t call;	250	call_t call;
249	phone_t *phone;	251	phone_t *phone;
250	int res;	252	int res;
251		253
252	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	254	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
253		255
254	ipc_call_static_init(&call);	256	ipc_call_static_init(&call);
255	IPC_SET_METHOD(call.data, method);	257	IPC_SET_METHOD(call.data, method);
256	IPC_SET_ARG1(call.data, arg1);	258	IPC_SET_ARG1(call.data, arg1);
257		259
258	if (!(res=request_preprocess(&call))) {	260	if (!(res=request_preprocess(&call))) {
259	ipc_call_sync(phone, &call);	261	ipc_call_sync(phone, &call);
260	process_answer(&call);	262	process_answer(&call);
261	} else	263	} else
262	IPC_SET_RETVAL(call.data, res);	264	IPC_SET_RETVAL(call.data, res);
263	STRUCT_TO_USPACE(&data->args, &call.data.args);	265	STRUCT_TO_USPACE(&data->args, &call.data.args);
264		266
265	return 0;	267	return 0;
266	}	268	}
267		269
268	/** Synchronous IPC call allowing to send whole message */	270	/** Synchronous IPC call allowing to send whole message */
269	__native sys_ipc_call_sync(__native phoneid, ipc_data_t *question,	271	__native sys_ipc_call_sync(__native phoneid, ipc_data_t *question,
270	ipc_data_t *reply)	272	ipc_data_t *reply)
271	{	273	{
272	call_t call;	274	call_t call;
273	phone_t *phone;	275	phone_t *phone;
274	int res;	276	int res;
275	int rc;	277	int rc;
276		278
277	ipc_call_static_init(&call);	279	ipc_call_static_init(&call);
278	rc = copy_from_uspace(&call.data.args, &question->args, sizeof(call.data.args));	280	rc = copy_from_uspace(&call.data.args, &question->args, sizeof(call.data.args));
279	if (rc != 0)	281	if (rc != 0)
280	return (__native) rc;	282	return (__native) rc;
281		283
282	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	284	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
283		285
284	if (!(res=request_preprocess(&call))) {	286	if (!(res=request_preprocess(&call))) {
285	ipc_call_sync(phone, &call);	287	ipc_call_sync(phone, &call);
286	process_answer(&call);	288	process_answer(&call);
287	} else	289	} else
288	IPC_SET_RETVAL(call.data, res);	290	IPC_SET_RETVAL(call.data, res);
289		291
290	rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);	292	rc = STRUCT_TO_USPACE(&reply->args, &call.data.args);
291	if (rc != 0)	293	if (rc != 0)
292	return rc;	294	return rc;
293		295
294	return 0;	296	return 0;
295	}	297	}
296		298
297	/** Check that the task did not exceed allowed limit	299	/** Check that the task did not exceed allowed limit
298	*	300	*
299	* @return 0 - Limit OK, -1 - limit exceeded	301	* @return 0 - Limit OK, -1 - limit exceeded
300	*/	302	*/
301	static int check_call_limit(void)	303	static int check_call_limit(void)
302	{	304	{
303	if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {	305	if (atomic_preinc(&TASK->active_calls) > IPC_MAX_ASYNC_CALLS) {
304	atomic_dec(&TASK->active_calls);	306	atomic_dec(&TASK->active_calls);
305	return -1;	307	return -1;
306	}	308	}
307	return 0;	309	return 0;
308	}	310	}
309		311
310	/** Send an asynchronous call over ipc	312	/** Send an asynchronous call over ipc
311	*	313	*
312	* @return Call identification, returns -1 on fatal error,	314	* @return Call identification, returns -1 on fatal error,
313	-2 on 'Too many async request, handle answers first	315	-2 on 'Too many async request, handle answers first
314	*/	316	*/
315	__native sys_ipc_call_async_fast(__native phoneid, __native method,	317	__native sys_ipc_call_async_fast(__native phoneid, __native method,
316	__native arg1, __native arg2)	318	__native arg1, __native arg2)
317	{	319	{
318	call_t *call;	320	call_t *call;
319	phone_t *phone;	321	phone_t *phone;
320	int res;	322	int res;
321		323
322	if (check_call_limit())	324	if (check_call_limit())
323	return IPC_CALLRET_TEMPORARY;	325	return IPC_CALLRET_TEMPORARY;
324		326
325	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);	327	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
326		328
327	call = ipc_call_alloc(0);	329	call = ipc_call_alloc(0);
328	IPC_SET_METHOD(call->data, method);	330	IPC_SET_METHOD(call->data, method);
329	IPC_SET_ARG1(call->data, arg1);	331	IPC_SET_ARG1(call->data, arg1);
330	IPC_SET_ARG2(call->data, arg2);	332	IPC_SET_ARG2(call->data, arg2);
331		333
332	if (!(res=request_preprocess(call)))	334	if (!(res=request_preprocess(call)))
333	ipc_call(phone, call);	335	ipc_call(phone, call);
334	else	336	else
335	ipc_backsend_err(phone, call, res);	337	ipc_backsend_err(phone, call, res);
336		338
337	return (__native) call;	339	return (__native) call;
338	}	340	}
339		341
340	/** Synchronous IPC call allowing to send whole message	342	/** Synchronous IPC call allowing to send whole message
341	*	343	*
342	* @return The same as sys_ipc_call_async	344	* @return The same as sys_ipc_call_async
343	*/	345	*/
344	__native sys_ipc_call_async(__native phoneid, ipc_data_t *data)	346	__native sys_ipc_call_async(__native phoneid, ipc_data_t *data)
345	{	347	{
346	call_t *call;	348	call_t *call;
347	phone_t *phone;	349	phone_t *phone;
348	int res;	350	int res;
349	int rc;	351	int rc;
350		352
351	if (check_call_limit())	353	if (check_call_limit())
352	return IPC_CALLRET_TEMPORARY;	354	return IPC_CALLRET_TEMPORARY;
353		355
354	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);	356	GET_CHECK_PHONE(phone, phoneid, return IPC_CALLRET_FATAL);
355		357
356	call = ipc_call_alloc(0);	358	call = ipc_call_alloc(0);
357	rc = copy_from_uspace(&call->data.args, &data->args, sizeof(call->data.args));	359	rc = copy_from_uspace(&call->data.args, &data->args, sizeof(call->data.args));
358	if (rc != 0) {	360	if (rc != 0) {
359	ipc_call_free(call);	361	ipc_call_free(call);
360	return (__native) rc;	362	return (__native) rc;
361	}	363	}
362	if (!(res=request_preprocess(call)))	364	if (!(res=request_preprocess(call)))
363	ipc_call(phone, call);	365	ipc_call(phone, call);
364	else	366	else
365	ipc_backsend_err(phone, call, res);	367	ipc_backsend_err(phone, call, res);
366		368
367	return (__native) call;	369	return (__native) call;
368	}	370	}
369		371
370	/** Forward received call to another destination	372	/** Forward received call to another destination
371	*	373	*
372	* The arg1 and arg2 are changed in the forwarded message	374	* The arg1 and arg2 are changed in the forwarded message
373	*	375	*
374	* Warning: If implementing non-fast version, make sure that	376	* Warning: If implementing non-fast version, make sure that
375	* arg3 is not rewritten for certain system IPC	377	* arg3 is not rewritten for certain system IPC
376	*/	378	*/
377	__native sys_ipc_forward_fast(__native callid, __native phoneid,	379	__native sys_ipc_forward_fast(__native callid, __native phoneid,
378	__native method, __native arg1)	380	__native method, __native arg1)
379	{	381	{
380	call_t *call;	382	call_t *call;
381	phone_t *phone;	383	phone_t *phone;
382		384
383	call = get_call(callid);	385	call = get_call(callid);
384	if (!call)	386	if (!call)
385	return ENOENT;	387	return ENOENT;
386		388
387	call->flags \|= IPC_CALL_FORWARDED;	389	call->flags \|= IPC_CALL_FORWARDED;
388		390
389	GET_CHECK_PHONE(phone, phoneid, {	391	GET_CHECK_PHONE(phone, phoneid, {
390	IPC_SET_RETVAL(call->data, EFORWARD);	392	IPC_SET_RETVAL(call->data, EFORWARD);
391	ipc_answer(&TASK->answerbox, call);	393	ipc_answer(&TASK->answerbox, call);
392	return ENOENT;	394	return ENOENT;
393	});	395	});
394		396
395	if (!is_forwardable(IPC_GET_METHOD(call->data))) {	397	if (!is_forwardable(IPC_GET_METHOD(call->data))) {
396	IPC_SET_RETVAL(call->data, EFORWARD);	398	IPC_SET_RETVAL(call->data, EFORWARD);
397	ipc_answer(&TASK->answerbox, call);	399	ipc_answer(&TASK->answerbox, call);
398	return EPERM;	400	return EPERM;
399	}	401	}
400		402
401	/* Userspace is not allowed to change method of system methods	403	/* Userspace is not allowed to change method of system methods
402	* on forward, allow changing ARG1 and ARG2 by means of method and arg1	404	* on forward, allow changing ARG1 and ARG2 by means of method and arg1
403	*/	405	*/
404	if (is_system_method(IPC_GET_METHOD(call->data))) {	406	if (is_system_method(IPC_GET_METHOD(call->data))) {
405	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)	407	if (IPC_GET_METHOD(call->data) == IPC_M_CONNECT_TO_ME)
406	phone_dealloc(IPC_GET_ARG3(call->data));	408	phone_dealloc(IPC_GET_ARG3(call->data));
407		409
408	IPC_SET_ARG1(call->data, method);	410	IPC_SET_ARG1(call->data, method);
409	IPC_SET_ARG2(call->data, arg1);	411	IPC_SET_ARG2(call->data, arg1);
410	} else {	412	} else {
411	IPC_SET_METHOD(call->data, method);	413	IPC_SET_METHOD(call->data, method);
412	IPC_SET_ARG1(call->data, arg1);	414	IPC_SET_ARG1(call->data, arg1);
413	}	415	}
414		416
415	return ipc_forward(call, phone, &TASK->answerbox);	417	return ipc_forward(call, phone, &TASK->answerbox);
416	}	418	}
417		419
418	/** Send IPC answer */	420	/** Send IPC answer */
419	__native sys_ipc_answer_fast(__native callid, __native retval,	421	__native sys_ipc_answer_fast(__native callid, __native retval,
420	__native arg1, __native arg2)	422	__native arg1, __native arg2)
421	{	423	{
422	call_t *call;	424	call_t *call;
423	ipc_data_t saved_data;	425	ipc_data_t saved_data;
424	int saveddata = 0;	426	int saveddata = 0;
425	int rc;	427	int rc;
426		428
427	/* Do not answer notification callids */	429	/* Do not answer notification callids */
428	if (callid & IPC_CALLID_NOTIFICATION)	430	if (callid & IPC_CALLID_NOTIFICATION)
429	return 0;	431	return 0;
430		432
431	call = get_call(callid);	433	call = get_call(callid);
432	if (!call)	434	if (!call)
433	return ENOENT;	435	return ENOENT;
434		436
435	if (answer_need_old(call)) {	437	if (answer_need_old(call)) {
436	memcpy(&saved_data, &call->data, sizeof(call->data));	438	memcpy(&saved_data, &call->data, sizeof(call->data));
437	saveddata = 1;	439	saveddata = 1;
438	}	440	}
439		441
440	IPC_SET_RETVAL(call->data, retval);	442	IPC_SET_RETVAL(call->data, retval);
441	IPC_SET_ARG1(call->data, arg1);	443	IPC_SET_ARG1(call->data, arg1);
442	IPC_SET_ARG2(call->data, arg2);	444	IPC_SET_ARG2(call->data, arg2);
443	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);	445	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
444		446
445	ipc_answer(&TASK->answerbox, call);	447	ipc_answer(&TASK->answerbox, call);
446	return rc;	448	return rc;
447	}	449	}
448		450
449	/** Send IPC answer */	451	/** Send IPC answer */
450	__native sys_ipc_answer(__native callid, ipc_data_t *data)	452	__native sys_ipc_answer(__native callid, ipc_data_t *data)
451	{	453	{
452	call_t *call;	454	call_t *call;
453	ipc_data_t saved_data;	455	ipc_data_t saved_data;
454	int saveddata = 0;	456	int saveddata = 0;
455	int rc;	457	int rc;
456		458
457	/* Do not answer notification callids */	459	/* Do not answer notification callids */
458	if (callid & IPC_CALLID_NOTIFICATION)	460	if (callid & IPC_CALLID_NOTIFICATION)
459	return 0;	461	return 0;
460		462
461	call = get_call(callid);	463	call = get_call(callid);
462	if (!call)	464	if (!call)
463	return ENOENT;	465	return ENOENT;
464		466
465	if (answer_need_old(call)) {	467	if (answer_need_old(call)) {
466	memcpy(&saved_data, &call->data, sizeof(call->data));	468	memcpy(&saved_data, &call->data, sizeof(call->data));
467	saveddata = 1;	469	saveddata = 1;
468	}	470	}
469	rc = copy_from_uspace(&call->data.args, &data->args,	471	rc = copy_from_uspace(&call->data.args, &data->args,
470	sizeof(call->data.args));	472	sizeof(call->data.args));
471	if (rc != 0)	473	if (rc != 0)
472	return rc;	474	return rc;
473		475
474	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);	476	rc = answer_preprocess(call, saveddata ? &saved_data : NULL);
475		477
476	ipc_answer(&TASK->answerbox, call);	478	ipc_answer(&TASK->answerbox, call);
477		479
478	return rc;	480	return rc;
479	}	481	}
480		482
481	/** Hang up the phone	483	/** Hang up the phone
482	*	484	*
483	*/	485	*/
484	__native sys_ipc_hangup(int phoneid)	486	__native sys_ipc_hangup(int phoneid)
485	{	487	{
486	phone_t *phone;	488	phone_t *phone;
487		489
488	GET_CHECK_PHONE(phone, phoneid, return ENOENT);	490	GET_CHECK_PHONE(phone, phoneid, return ENOENT);
489		491
490	if (ipc_phone_hangup(phone))	492	if (ipc_phone_hangup(phone))
491	return -1;	493	return -1;
492		494
493	return 0;	495	return 0;
494	}	496	}
495		497
496	/** Wait for incoming ipc call or answer	498	/** Wait for incoming ipc call or answer
497	*	499	*
498	* @param calldata Pointer to buffer where the call/answer data is stored	500	* @param calldata Pointer to buffer where the call/answer data is stored

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/ipc/sysipc.c @ 1428 – Rev 1428 → 1434