MPE/iX Intrinsics Reference Manual (32650-90875)

Chapter 6 239
Command Definitions (FLUSHLOG-GETUSERMODE)
FOPEN
that the disk file is restricted to the volume class whose
name is specified in
volclass . The specified volume class
must reside within the volume set bound to the group
where the file resides. This option is applicable only at file
creation.
devname device name option
Passes the logical device number, in ASCII format, of a
specific device. The file is assumed to be permanent. If the
logical device number of a nonshareable device is specified,
the nonshareable device must be ready prior to the FOPEN
call.
If the device name option is used to open a file residing on
a disk, specify the logical device number of the disk drive
where a volume which resides within the volume set
bound to the group where the file resides is mounted
(applicable only at file creation). Thereafter, the disk file is
associated with that volume, not with the originally
specified logical device number.
devclass device class option
Passes a device class name or volume class name of up to
eight alphanumeric characters beginning with an alpha
character. For example, TAPE or DISC. If
devclass is
specified, the file is allocated to any available device in
that class.
If the device class option is used to open a file residing on a
disk, specify a device class name that corresponds to a
valid and mounted volume class name; otherwise, it is
assumed that the attempt is to open a device file not a disk
file. Applicable only at file creation. The specified volume
class must reside within the volume set bound to the
group where the file resides. The file is free to span any of
the volumes that fall within the specified volume class.
NOTE If either volumeset, vol, volclass, devname , or devclass is not
specified, FOPEN defaults to a disk file located on the volume class DISC bound
to the group where the file resides. The file is free to span all volumes in the
volume class DISC.
When opening a magnetic tape that is shared for a second time, open the
device with the device name option instead of device class option. This
ensures that the system operator is not confused by a second tape request.
;DEN=
density tape density option
Passes the tape density to be used while writing to a tape
file. This option is applicable only when writing to a tape
on a drive that supports more than one density. When