<<I am trying to implement NOWAITed I/O using NetIPC.  I seem to have
the choice of an immediate timeout and infinite time out.  Anyone ever do
this?? An example is worth a thousand words.  Oh and I have to do this in
COBOL as it is a COBOL shop.>>


"Timeout" is N/A for NOWAIT I/O; the operation always returns immediately,
and you use IODONTWAIT to see if the physical I/O has completed.

I don't do COBOL, but translating the following should provide what you need.

        int RecvBlockNoWait(SOCKET Sock, char *buf, int maxlen, int
recvflags)
                {
                int dlen = maxlen;
                short rlen = 0;
                int flags = recvflags;
                int res32 = 0;

                IPCCONTROL(Sock, 1,,,,,, &res32);       /* enable NOWAIT */
                if (res32)
                        {
                        printf("IPCCONTROL(1) error: %d\n", res32);
                        fflush(stdout);
                        errno_IPC = res32;
                        return SOCKET_ERROR;
                        }
                IPCRECV(Sock, buf, &dlen, &flags,, &res32);
                if (res32)
                        {
                        printf("Waited IPCRECV error: %d\n", res32);
                        fflush(stdout);
                        errno_IPC = res32;
                        return SOCKET_ERROR;
                        }
                dlen = 0;
                if (IODONTWAIT(Sock, buf, &rlen))       /* try to complete
the receive */
                        {
                        dlen = rlen;
                        }
                IPCCONTROL(Sock, 258,,,,,, &res32);
                if (res32)
                        {
                        printf("IPCCONTROL(258) error: %d\n", res32);
                        fflush(stdout);
                        }

                IPCCONTROL(Sock, 2,,,,,, &res32);       /* disable NOWAIT */
                if (res32)
                        {
                        printf("IPCCONTROL(2) error: %d\n", res32);
                        fflush(stdout);
                        }
                return dlen;
                }


Steve


Steve Dirickson    WestWin Consulting
(360) 598-6111   [log in to unmask]