skip book previous and next navigation links
go up to top of book: HP OpenVMS I/O User's Reference Manual HP OpenVMS I/O User's Reference Manual
go to beginning of chapter: Disk Drivers Disk Drivers
go to previous page: Disk Function Codes Disk Function Codes
go to next page: Disk Driver Programming ExampleDisk Driver Programming Example
end of book navigation links

I/O Status Block  



IOSB Contents shows the I/O status block (IOSB) for all disk device QIO functions except sense mode. IOSB Contents for the Sense Mode Function shows the I/O status block for the sense mode function. IOSB Contents for the Sense Mode Function lists the status messages for all functions and devices. (The OpenVMS system messages documentation provides explanations and suggested user actions for these messages.)  

Figure 7  IOSB Contents  
IOSB Contents

The byte count is a 32-bit integer that gives the actual number of bytes transferred to or from the process buffer.  

Figure 8  IOSB Contents for the Sense Mode Function  
IOSB Contents for the Sense Mode Function

The second longword of the I/O status block for the sense mode function returns information about the cylinder, track, and sector configurations for the particular device.


go to previous page: Disk Function Codes Disk Function Codes
go to next page: Disk Driver Programming ExampleDisk Driver Programming Example