;/* divert.c - commodity to monitor user inactivity - compiled with SASC 5.10
LC -b0 -cfist -v -j73 divert.c
Blink FROM LIB:c.o,divert.o TO divert LIBRARY LIB:LC.lib,LIB:Amiga.lib NODEBUG SC SD
quit; */
#include <exec/libraries.h>
#include <libraries/commodities.h>
#include <dos/dos.h>
#include <clib/exec_protos.h>
#include <clib/alib_protos.h>
#include <clib/alib_stdio_protos.h>
#include <clib/commodities_protos.h>
#include <devices/inputevent.h>

#ifdef LATTICE
int CXBRK(void) { return(0); }  /* Disable Lattice CTRL/C handling */
int chkabort(void) { return(0); }
#endif

#define TIMER_CLICKS 100

void main(int, char **);
void ProcessMsg(void);
void CxFunction(CxMsg *, CxObj *);

struct Library *CxBase, *IconBase;
struct MsgPort *broker_mp;
CxObj *broker, *cocustom, *cosignal;

struct NewBroker newbroker =
{
    NB_VERSION,
    "Divert",           /* string to identify this broker */
    "Divert",
    "show divert",
    NBU_UNIQUE | NBU_NOTIFY,  /* Don't want any new commodities starting with this name. */
    0, 0, 0, 0                /* If someone tries it, let me know                        */
};

struct Task *task;
ULONG cxsigflag, signal, cxobjsignal;

void main(int argc, char **argv)
{
    UBYTE **ttypes;
    CxMsg *msg;

    if (CxBase = OpenLibrary("commodities.library", 37L))
    {
        /* open the icon.library for support library functions, ArgArrayInit() and ArgArrayDone() */
        if (IconBase = OpenLibrary("icon.library", 36L))
        {
            if (broker_mp = CreateMsgPort())
            {
                newbroker.nb_Port = broker_mp;
                cxsigflag = 1L << broker_mp->mp_SigBit;

                /* ArgArrayInit() is a support library function (in the 2.0 version of amiga.lib) */
                /* that makes it easy to read arguments from either a CLI or from Workbench's     */
                /* ToolTypes. Because it uses icon.library, the library has to be open before     */
                /* before calling this function.  ArgArrayDone() cleans up after this function.   */
                ttypes = ArgArrayInit(argc, argv);

                /* ArgInt() (in amiga.lib) searches through the array set up by ArgArrayInit()    */
                /* for a specific ToolType.  If it finds one, it returns the numeric value of the */
                /* number that followed the ToolType (i.e., CX_PRIORITY=7).  If it  doesn't find  */
                /* the ToolType, it returns the default value (the third argument)                */
                newbroker.nb_Pri = (BYTE)ArgInt(ttypes, "CX_PRIORITY", 0);

                if (broker = CxBroker(&newbroker, NULL))
                {
                    /* CxCustom() takes two arguments, a pointer to the custom function           */
                    /* and an ID. Commodities Exchange will assign that ID to any CxMsg           */
                    /* passed to the custom  function.                                            */
                    if (cocustom = CxCustom(CxFunction, 0L))
                    {
                        AttachCxObj(broker, cocustom);

                        /* Allocate a signal bit for the signal CxObj */
                        if ( (signal = (ULONG)AllocSignal(-1L)) != -1)
                        {
                            /* set up the signal mask */
                            cxobjsignal = 1L << signal;
                            cxsigflag |= cxobjsignal;

                            /* CxSignal takes two arguments, a pointer to the task to signal      */
                            /* (normally the commodity) and the number of the signal bit the      */
                            /* commodity acquired to signal with.                                 */
                            task = FindTask(NULL);
                            if (cosignal = CxSignal(task, signal))
                            {
                                AttachCxObj(cocustom, cosignal);
                                ActivateCxObj(broker, 1L);
                                ProcessMsg();
                            }
                            FreeSignal(signal);
                        }
                    }
                    /* DeleteCxObjAll() is a commodities.library function that not only deletes   */
                    /* the CxObject pointed to in its argument, but it deletes all of the         */
                    /* CxObjects that are attached to it.                                         */
                    DeleteCxObjAll(broker);

                    /* Empty the port of all CxMsgs */
                    while(msg = (CxMsg *)GetMsg(broker_mp))
                        ReplyMsg((struct Message *)msg);
                }
                DeletePort(broker_mp);
            }
            ArgArrayDone();   /* this amiga.lib function cleans up after ArgArrayInit()           */
            CloseLibrary(IconBase);
        }
        CloseLibrary(CxBase);
    }
}

void ProcessMsg(void)
{
    extern struct MsgPort *broker_mp;
    extern CxObj *broker;
    extern ULONG cxsigflag;
    CxMsg *msg;
    ULONG sigrcvd, msgid;
    LONG returnvalue = 1L;

    while (returnvalue)
    {
        sigrcvd = Wait(SIGBREAKF_CTRL_C | cxsigflag);

        while(msg = (CxMsg *)GetMsg(broker_mp))
        {
            msgid = CxMsgID(msg);
            ReplyMsg((struct Message *)msg);

            switch(msgid)
            {
                case CXCMD_DISABLE:
                    ActivateCxObj(broker, 0L);
                    break;
                case CXCMD_ENABLE:
                    ActivateCxObj(broker, 1L);
                    break;
                case CXCMD_KILL:
                    returnvalue = 0L;
                    break;
                case CXCMD_UNIQUE:
                    returnvalue = 0L;
                    break;
            }
        }

        if (sigrcvd & SIGBREAKF_CTRL_C) returnvalue = 0L;

        /* Check to see if the signal CxObj signalled us. */
        if (sigrcvd & cxobjsignal) printf("Got Signal\n");
    }
}

/* The custom function for the custom CxObject.  Any code for a custom CxObj must be short        */
/* and sweet because it runs as part of the input.device task.                                    */
void CxFunction(register CxMsg *cxm, CxObj *co)
{
    struct InputEvent *ie;
    static ULONG time = 0L;

    /* Get the struct InputEvent associated with this CxMsg. Unlike the InputEvent                */
    /* extracted from a CxSender's CxMsg, this is a *REAL* input event, be careful with it.       */
    ie = (struct InputEvent *)CxMsgData(cxm);

    /* This custom function counts the number of timer events that go by while no other input     */
    /* events occur.  If it counts more than a certain amount of timer events, it clears the      */
    /* count and diverts the timer event CxMsg to the custom object's personal                    */
    /* list.  If an event besides a timer event passes by, the timer event count is reset.        */
    if (ie->ie_Class == IECLASS_TIMER)
    {
        time++;
        if (time >= TIMER_CLICKS)
        {
            time = 0L;
            DivertCxMsg(cxm, co, co);
        }
    }
    else
        time = 0L;
}

[Back to Amiga Developer Docs]