Utilities 3 (Disk 38) (Mar 1987) : c / pipedevice / misc.c

/*
 *  misc.c  - support routines - Phillip Lindsay (C) Commodore 1986
 *  You may freely distribute this source and use it for Amiga Development -
 *  as long as the Copyright notice is left intact.
 *
 * 30-SEP-86
 *
 *  Modified by Matthew Dillon for my PIPE: device.
 */

#include <exec/types.h>
#include <exec/nodes.h>
#include <exec/lists.h>
#include <exec/ports.h>
#include <libraries/dos.h>
#include <libraries/dosextens.h>

extern void returnpkt();

/* returnpkt() - packet support routine
 * here is the guy who sends the packet back to the sender...
 *
 * (I modeled this just like the BCPL routine [so its a little redundant] )
 */

void
returnpktplain(packet, myproc)
struct DosPacket *packet;
struct Process *myproc;
{
    returnpkt(packet, myproc, packet->dp_Res1, packet->dp_Res2);
}

void
returnpkt(packet, myproc, res1, res2)
struct DosPacket *packet;
struct Process *myproc;
ULONG  res1, res2;
{
    struct Message *mess;
    struct MsgPort *replyport;

    packet->dp_Res1          = res1;
    packet->dp_Res2          = res2;
    replyport                = packet->dp_Port;
    mess                     = packet->dp_Link;
    packet->dp_Port          = &myproc->pr_MsgPort;
    mess->mn_Node.ln_Name    = (char *) packet;
    mess->mn_Node.ln_Succ    = NULL;
    mess->mn_Node.ln_Pred    = NULL;
    PutMsg(replyport, mess);
}


/*
 * taskwait() ... Waits for a message to arrive at your port and
 *   extracts the packet address which is returned to you.
 */

struct DosPacket *
taskwait(myproc)
struct Process *myproc;
{
    struct MsgPort *myport;
    struct Message *mymess;

    myport = &myproc->pr_MsgPort;
    WaitPort(myport);
    mymess = (struct Message *)GetMsg(myport);
    return((struct DosPacket *)mymess->mn_Node.ln_Name);
}

/* end of misc.c    */