I/O Status Block

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HP OpenVMS I/O User's Reference Manual

Mailbox Driver

Mailbox Function Codes

Mailbox Driver Programming Examples

I/O Status Block

On VAX and Alpha systems, the I/O status blocks (IOSB) for mailbox read, write, set protection, and get mailbox information QIO functions are shown in IOSB Contents Read Function, IOSB Contents Write Function, IOSB Contents Set Protection Function, and IOSB Contents Get Mailbox Information Function.

I/O Function Codes lists the I/O status returns for these functions. In addition to the IOSB return values, the following statuses can be returned in R0 by the call to the system service:

SS$_ACCVIO

SS$_EXQUOTA

SS$_ILLIOFUNC

SS$_INSFMEM

SS$_MBFULL

SS$_MBTOOSML

SS$_NOPRIV

SS$_NORMAL

(The OpenVMS system messages documentation provides explanations and suggested user actions for both types of returns.)

Figure 8 IOSB Contents -- Read Function

Figure 9 IOSB Contents-- Write Function

IOSB Contents -- Write Function

Figure 10 IOSB Contents-- Set Protection Function

IOSB Contents -- Set Protection Function

Figure 11 IOSB Contents -- Get Mailbox Information Function

Mailbox Function Codes

Mailbox Driver Programming Examples