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coff
a.out elf
exec
switch
NFS
file mappings
FFS
virtual
device memory vnode/vfs
mappings interface
framework s5fs
anonymous RFS
mappings
Common
Facilities
disk driver block time-sharing
device scheduler processes
switch framework
tape driver system
processes
STREAMS
network tty
driver driver
Figure 2.17 Modern UNIX Kernel [VAHA96]
