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273
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 34 (Page No. 83)
Write a shell that is similar to Fig. $1-19$ but contains enough code that it actually works so you can test it. You might also add some features such as redirection of input and output, pipes, and background jobs.
Write a shell that is similar to Fig. $1-19$ but contains enough code that it actually works so you can test it. You might also add some features such as redirection of i...
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275
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 32 (Page No. 83)
Virtual machines have become very popular for a variety of reasons. Nevertheless, they have some downsides. Name one.
Virtual machines have become very popular for a variety of reasons. Nevertheless, they have some downsides. Name one.
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276
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 31 (Page No. 83)
Explain how separation of policy and mechanism aids in building microkernel-based operating systems.
Explain how separation of policy and mechanism aids in building microkernel-based operating systems.
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279
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 28 (Page No. 83)
To a programmer, a system call looks like any other call to a library procedure. Is it important that a programmer know which library procedures result in system calls? Under what circumstances and why?
To a programmer, a system call looks like any other call to a library procedure. Is it important that a programmer know which library procedures result in system calls? U...
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280
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 27 (Page No. 83)
Modern operating systems decouple a process address space from the machine’s physical memory. List two advantages of this design.
Modern operating systems decouple a process address space from the machine’s physical memory. List two advantages of this design.
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281
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 26 (Page No. 83)
In the example given in Fig. $1-17$, the library procedure is called read and the system call itself is called read. Is it essential that both of these have the same name? If not, which one is more important?
In the example given in Fig. $1-17$, the library procedure is called read and the system call itself is called read. Is it essential that both of these have the same name...
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282
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 25 (Page No. 83)
What is the essential difference between a block special file and a character special file?
What is the essential difference between a block special file and a character special file?
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285
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 22 (Page No. 82)
Can the count = write(fd, buffer, nbytes); call return any value in count other than nbytes? If so, why?
Can thecount = write(fd, buffer, nbytes);call return any value in count other than nbytes? If so, why?
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286
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 21 (Page No. 82)
What type of multiplexing (time, space, or both) can be used for sharing the following resources: CPU, memory, disk, network card, printer, keyboard, and display?
What type of multiplexing (time, space, or both) can be used for sharing the following resources: CPU, memory, disk, network card, printer, keyboard, and display?
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287
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 20 (Page No. 82)
For each of the following system calls, give a condition that causes it to fail: fork, exec, and unlink.
For each of the following system calls, give a condition that causes it to fail: fork, exec, and unlink.
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288
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 19 (Page No. 82)
Is there any reason why you might want to mount a file system on a nonempty directory? If so, what is it?
Is there any reason why you might want to mount a file system on a nonempty directory? If so, what is it?
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289
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 18 (Page No. 82)
Why is the process table needed in a timesharing system? Is it also needed in personal computer systems running UNIX or Windows with a single user?
Why is the process table needed in a timesharing system? Is it also needed in personal computer systems running UNIX or Windows with a single user?
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293
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 14 (Page No. 82)
A computer has a pipeline with four stages. Each stage takes the same time to do its work, namely, $1$ nsec. How many instructions per second can this machine execute?
A computer has a pipeline with four stages. Each stage takes the same time to do its work, namely, $1$ nsec. How many instructions per second can this machine execute?
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295
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 12 (Page No. 82)
Which of the following instructions should be allowed only in kernel mode? Disable all interrupts. Read the time-of-day clock. Set the time-of-day clock. Change the memory map
Which of the following instructions should be allowed only in kernel mode?Disable all interrupts.Read the time-of-day clock.Set the time-of-day clock.Change the memory ma...
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297
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 10 (Page No. 81)
What is the difference between kernel and user mode? Explain how having two distinct modes aids in designing an operating system.
What is the difference between kernel and user mode? Explain how having two distinct modes aids in designing an operating system.
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298
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 9 (Page No. 81)
There are several design goals in building an operating system, for example, resource utilization, timeliness, robustness, and so on. Give an example of two design goals that may contradict one another.
There are several design goals in building an operating system, for example, resource utilization, timeliness, robustness, and so on. Give an example of two design goals ...
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300
Andrew S. Tanenbaum (OS) Edition 4 Exercise 1 Question 7 (Page No. 81)
The family-of-computers idea was introduced in the $1960s$ with the IBM System$/360$ mainframes. Is this idea now dead as a doornail or does it live on?
The family-of-computers idea was introduced in the $1960s$ with the IBM System$/360$ mainframes. Is this idea now dead as a doornail or does it live on?
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