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1030 palkovsky 1 
#include <ipc.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <ns.h>
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#include <errno.h>
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/*
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irq_cmd_t msim_cmds[1] = {
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    { CMD_MEM_READ_1, (void *)0xB0000000, 0 }
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};
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irq_code_t msim_kbd = {
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    1,
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    msim_cmds
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};
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*/
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static int service;
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int main(int argc, char **argv)
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{
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    ipc_call_t call;
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    ipc_callid_t callid;
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    ipcarg_t retval, arg1, arg2;
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    printf("NS:Name service started.\n");
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//  ipc_register_irq(2, &msim_kbd);
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    while (1) {
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        callid = ipc_wait_for_call(&call, 0);
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        printf("NS:Call phone=%lX..", call.phoneid);
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        switch (IPC_GET_METHOD(call)) {
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        case IPC_M_INTERRUPT:
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            printf("GOT INTERRUPT: %c\n", IPC_GET_ARG2(call));
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            break;
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        case IPC_M_PHONE_HUNGUP:
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            printf("Phone hung up.\n");
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            retval = 0;
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            break;
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        case IPC_M_CONNECT_TO_ME:
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            printf("Somebody connecting phid=%zd.\n", IPC_GET_ARG3(call));
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            service = IPC_GET_ARG3(call);
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            retval = 0;
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            break;
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        case IPC_M_CONNECT_ME_TO:
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            printf("Connectme(%P)to: %zd\n",
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                   IPC_GET_ARG3(call), IPC_GET_ARG1(call));
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            retval = 0;
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            break;
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        case NS_PING:
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            printf("Ping...%P %P\n", IPC_GET_ARG1(call),
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                   IPC_GET_ARG2(call));
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            retval = 0;
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            arg1 = 0xdead;
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            arg2 = 0xbeef;
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            break;
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        case NS_HANGUP:
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            printf("Closing connection.\n");
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            retval = EHANGUP;
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            break;
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        case NS_PING_SVC:
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            printf("NS:Pinging service %d\n", service);
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            ipc_call_sync(service, NS_PING, 0xbeef, 0);
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            printf("NS:Got pong\n");
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            break;
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        default:
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            printf("Unknown method: %zd\n", IPC_GET_METHOD(call));
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            retval = ENOENT;
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            break;
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        }
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        if (! (callid & IPC_CALLID_NOTIFICATION)) {
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            printf("Answerinh\n");
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            ipc_answer(callid, retval, arg1, arg2);
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        }
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    }
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}