NetIPC 3000/XL Programmer's Reference Manual (5958-8600)

Table Of Contents

54 Chapter2

Cross-System NetIPC

NetIPC Error Codes

NetIPC calls with the same names on different systems may return

different error codes. Refer to the corresponding NetIPC documentation

of your system for a complete list of the NetIPC error codes that are

applicable to your implementation.

IPCRECVCN

Checksumming — With PC NetIPC, the TCP checksum option cannot be

turned on. But if the HP 3000 requires it, the TCP checksum is in effect on

both sides of the connection.

Send and receive sizes — The HP 3000 send and receive size range is 1 to

30,000 bytes. The PC send and receive size range is 1 to 65,535 bytes.

Although the ranges are different, cross-system communication is not

affected. If you specify a send or receive size, be sure it is within the correct

range for the respective system. For example, if the PC node sends 60,000

bytes, the HP 3000 node can call IPCRECV twice, receiving 30,000 bytes the

ﬁrst time and the second 30,000 bytes the second time.

Note that the default send and receive sizes are different on different HP

systems. On the HP 3000, the default send and receive size is less than or

equal to 1,024 bytes.

IPCSEND

Send size — The PC send and receive size range is 1 to 65,635 bytes.

Although the ranges are different, cross-system communication is not

affected. If you specify a send or receive size, be sure it is within the correct

range for the respective system.

On the PC, you can specify the maximum receive size of the data buffer

through the

got array

in the IPCCONNECT call. This determines what the

maximum value the

dlen

parameter can be for any IPCRECV call. PC NetIPC

has no option array deﬁned for IPCCONNECT. This does not affect cross-system

communication. The maximum receive size of the data in the buffer on the

HP 3000 will determine the receive size buffer on the PC.

IPCSHUTDOWN Socket shut down — The HP 3000 provides a graceful release ﬂag that is

not available on the PC. If the graceful release ﬂag (

flags 17

) is set on the

HP 3000, the PC will respond as though it were a normal shutdown.

Table 2-5 Cross-System Calls (HP 3000 — PC)

NetIPC Call Cross-System Considerations