A/UX® System Administrator's Reference Sections 1M, 7, and 8

gd(7) gd(7)
7
for writing.
ioctl (fd, GD SPARE, blocknum)
This ioctl causes hardware-specific bad blocking of the
block number given as the third argument (blocknum) to the
function. The block number is always relative to the start of
a partition. This ioctl call may only be used by the superuser,
or if the file descriptor is open for writing.
ioctl (fd, GD UNSETPNAME, 0)
The partition name, if any, assigned to the minor device
number is removed. If the minor number is assigned a partition
by default, the partition name assignment is recalculated
on next access. Otherwise, an error (ENXIO) is returned on
next access. This function may only be invoked by the superuser,
or if the file descriptor is open for writing.
ioctl (fd, UIOCEXTE, 0)
This ioctl activates error printing on the system console.
The file descriptor may correspond to any character device
file associated with the desired controller. This ioctl may
only be performed by the superuser, or on a file descriptor
that is open for writing.
ioctl (fd, UIOCFORMAT, disk/ormat)
This ioctl formats the disk. The placeholder fd should be
an open file descriptor of the character device (that is,
/ dev / rdsk/ c?d? s ?). The third parameter to the ioctl
function call contains the address of a diskformat structure
(defined in /usr / include/ sys/ diskformat. h).
The d secsize field of this structure may be used to specify
512-=-byte or 532-byte sector size for formatting. The 532byte
sector size will not be supported in future versions of the
driver and should not be used. The other fields of the diskformat
structure are ignored. The ioctl may only be applied
to partition 31 of a disk. The ioctl may only be used
by the superuser, or if the file descriptor is open for writing.
ioctl (fd, UIOCNEXTE, 0)
This ioctl deactivates error printing. The file descriptor
may correspond to any character device file associated with
the desired controller. When deactivated, device errors continue
to be logged by errdemon(lM) but do not disturb t.lte
display on the console. This ioctl may only be performed
February, 1990
RevisionC