Page 136 - slides.dvi

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Unix
–
–
I/O
Case
Block
two
Recall:
Study—
Low-level
Character
I/O
I/O
broad
everything
I/O
stuff
is
Subsystem
simpler
gory
low
accessed
but
Implementation
categories:
and
rate
via
Device Driver
Cooked
but
Character I/O
the
block
machine
file
Raw Character I/O
and
Device Driver
performance
complex
char.
⇒
system.
matters
dependent
Cache
Buffer
Device Driver
⇒
most
⇒
Generic File System Layer
Raw Block I/O
Device Driver
code
ignore.
in
emphasis
the
Kernel
Hardware
Kernel
User
on
the

“cooked”
buffer

cache.
interface.

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