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Source Code 1992 March
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Source_Code_CD-ROM_Walnut_Creek_March_1992.iso
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README
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1990-12-28
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585b
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This driver is a System V adaptation of an equivalent driver for 4.2BSD.
The original idea appeared in Version 8 Unix.
When a process opens minor device N of this driver it get a file descriptor
which is a duplicate of its own file descriptor N, as if a dup(2) call had
been effected.
This is most useful to make it possible to redirect to the standard input
output and error streams programs that require a named file as operand. For
example, something like
cp /etc/passwd /dev/stdout | wc
will work as intended (this particular example may not be very useful, but
others are).