Vax 613 0S Instruction Manual Page 284

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IOCTL
IOCTL
Perform device-specific I/O operations; unsupported through TURBOchannel
options.
Format
status = DISPATCH(IOCTL,
channel_nbr,
opt_p1,
opt_p2,
opt_p3,
opt_p4);
Arguments
IOCTL
IOCTL function code (12
16
).
channel_nbr
Channel associated with the device on which to perform the operation.
opt_p1
Optional parameter 1.
For magnetic tape devices, opt_p1 = operation_type , where:
01
16
= SKIP over tape mark
02
16
= SKIP to next/previous interrecord gap
03
16
= SKIP to beginning-of-tape mark
04
16
= WRITE tape mark
opt_p2
Optional parameter 2.
For magnetic tape devices, opt_p2 = count of skips to perform.
opt_p3
Optional parameter 3.
opt_p4
Optional parameter 4.
Description
This routine performs device-specific actions to a particular class of device. The
routine now supports only magnetic tape devices.
16–60 Console
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