Multi-Answer QuestionFigure below illustrates the block diagram of a Unix file system. Two processes perform open file commands to open files "foo" and "baand perform operations on these two files. Suppose that Process 1 is a "producer process" and Process 2 is a "consumer process" thatcommunicate data using file "/../../bar" and tables shown in figure.Select all correct answers.System-wideopen-tiletablePer-processopen-file table-1File system3file descriptorSuper block54Process 1FCB's65...fd1 = open(/../../too, Read-only)fd2 = open(/../../bar, Read-and-write)wc = write (out-fd, buffer, #-of-bytes)76Free blocks879File blocks10Per-processopen-file table-2113FCB: File Control BlockProcess 24Buffer: size 1024 bytesfd3= open(/../../bar, Read-only)fd4 = open(/../../too, Read-and-write)rc = read (in-td, butter, #-of-bytes)56"Per-process open-file tables" allow processes to open a file several times with different file-descriptors and for different purposes.The operating system uses FCBs of files/../../bar and /../../foo to access the index-blocks and data-blocks of those files.128 bytesNot empty wc = write (out-fd, buffer, #-of-bytes)Free blocks7File blocks10Per-processopen-file table-2113FCB: File Control BlockProcess 24Buffer: size 1024 bytesfd3= open(/../../bar, Read-only)fd4 = open(/../../too, Read-and-write)rc = read (in-fd, buffer, #-of-bytes)5......6O "Per-process open-file tables" allow processes to open a file several times with different file-descriptors and for different purposes.O The operating system uses FCBs of files /../../bar and /../../foo to access the index-blocks and data-blocks of those files.O When process 1 or process 2 closes file "/../../foo", then "file-count" of this file in the "system-wide open-file table" will bedecremented, and when this file-count becomes zero, the FCB of "/../../foo" will be written back to the file system.In order to open file /../../foo, its file control block (FCB) should be stored in an empty location in the "per-process open-file table".Since the file-descriptors fd2 and fd3 are used to open the same file /../../bar, then both of them should have the same number.O Process 1 uses fd1 to write data into the "buffer" and Process 2 uses fd4 to read data from the buffer.< Previous128 bytes89Not empty

Multi-Answer Question Figure below illustrates the block diagram of a Unix file system. Two processes perform open file commands to open files "foo" ar and perform operations on these two files. Suppose that Process 1 is a "producer process" and Process 2 is a "consumer process' communicate data using file "/../../bar" and tables shown in figure. Select all correct answers. System-wide open-file table Per-process open-file table-1 File system 3 Super block file descriptor 5 4 Process 1 FCB's 6 5 fd1 = open(/../../too, Read-only) fd2 = open(/../../bar, Read-and-write) wc = write (out-fd, buffer, #-of-bytes) 7 6 Free blocks 8 7 9

Multi-Answer Question Figure below illustrates the block diagram of a Unix file system. Two processes perform open file commands to open files "foo" ar and perform operations on these two files. Suppose that Process 1 is a "producer process" and Process 2 is a "consumer process' communicate data using file "/../../bar" and tables shown in figure. Select all correct answers. System-wide open-file table Per-process open-file table-1 File system 3 Super block file descriptor 5 4 Process 1 FCB's 6 5 fd1 = open(/../../too, Read-only) fd2 = open(/../../bar, Read-and-write) wc = write (out-fd, buffer, #-of-bytes) 7 6 Free blocks 8 7 9

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Question

wc = write (out-fd, buffer, #-of-bytes)
Free blocks
7
File blocks
10
Per-process
open-file table-2
11
3
FCB: File Control Block
Process 2
4
Buffer: size 1024 bytes
fd3= open(/../../bar, Read-only)
fd4 = open(/../../too, Read-and-write)
rc = read (in-fd, buffer, #-of-bytes)
5
......
6
O "Per-process open-file tables" allow processes to open a file several times with different file-descriptors and for different purposes.
O The operating system uses FCBs of files /../../bar and /../../foo to access the index-blocks and data-blocks of those files.
O When process 1 or process 2 closes file "/../../foo", then "file-count" of this file in the "system-wide open-file table" will be
decremented, and when this file-count becomes zero, the FCB of "/../../foo" will be written back to the file system.
In order to open file /../../foo, its file control block (FCB) should be stored in an empty location in the "per-process open-file table".
Since the file-descriptors fd2 and fd3 are used to open the same file /../../bar, then both of them should have the same number.
O Process 1 uses fd1 to write data into the "buffer" and Process 2 uses fd4 to read data from the buffer.
< Previous
128 bytes
8
9
Not empty

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