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tape I/O under Unix: eof always true? [message #620]

Thu, 31 December 1992 06:18

knight
Messages: 37
Registered: January 1992

Member

Can anybody give me some help on IDL's handling of eof while reading
tape under Unix? The following test fails. I mount a (test) tar tape
and do the following:

IDL> openr,lun,/get_lun,'/dev/rst0'
IDL> print,eof(lun)
1 ; <==== Why? Shouldn't it be zero?
IDL> point_lun,lun,100
IDL> print,eof(lun)
1 ; <==== Same question.
IDL> a=bytarr(2048)
IDL> readu,lun,a
IDL> print,eof(lun)
1 ; <==== Same question.

Thanks for any help,

Fred
--
=Fred Knight (knight@ll.mit.edu) (617) 981-2027
C-483\\MIT Lincoln Laboratory\\244 Wood Street\\Lexington, MA 02173

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