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Modern Operating Systems by Herbert Bos and Andrew S. Tanenb...
Modern_Operating_Systems_by_Herbert_Bos_and_Andrew_S._Tanenbaum_4th_Ed.pdf
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Modern Operating Systems by Herbert Bos and Andrew...
Modern_Operating_Systems_by_Herbert_Bos_and_Andrew_S._Tanenbaum_4th_Ed.pdf-M ODERN O PERATING S YSTEMS
Modern Operating Systems by Herbert...
Modern_Operating_Systems_by_Herbert_Bos_and_Andrew_S._Tanenbaum_4th_Ed.pdf-M ODERN O PERATING S YSTEMS
Page 886
CHAP. 10
PROBLEMS
855
running the program special rights only with respect to access to files. Why is this fea-
ture useful?
56.
On a Linux system, go to
/proc/####
directory, where #### is a decimal number cor-
responding to a process currently running in the system. Answer the following along
with an explanation:
(a) What is the size of most of the files in this directory?
(b) What are the time and date settings of most of the files?
(c) What type of access right is provided to the users for accessing the files?
57.
If you are writing an Android activity to display a Web page in a browser, how would
you implement its activity-state saving to minimize the amount of saved state without
losing anything important?
58.
If you are writing networking code on Android that uses a socket to download a file,
what should you consider doing that is different than on a standard Linux system?
59.
If you are designing something like Android’s
zygote
process for a system that will
have multiple threads running in each process forked from it, would you prefer to start
those threads in zygote or after the fork?
60.
Imagine you use Android’s Binder IPC to send an object to another process.
You later
receive an object from a call into your process, and find that what you have received is
the same object as previously sent.
What can you assume or not assume about the cal-
ler in your process?
61.
Consider an Android system that, immediately after starting, follows these steps:
1. The home (or launcher) application is started.
2. The email application starts syncing its mailbox in the background.
3. The user launches a camera application.
4. The user launches a Web browser application.
The web page the user is now viewing in the browser application requires inceasingly
more RAM, until it needs everything it can get.
What happens?
62.
Write a minimal shell that allows simple commands to be started.
It should also allow
them to be started in the background.
63.
Using assembly language and BIOS calls, write a program that boots itself from a flop-
py disk on a Pentium-class computer. The program should use BIOS calls to read the
keyboard and echo the characters typed, just to demonstrate that it is running.
64.
Write a dumb terminal program to connect two Linux computers via the serial ports.
Use the POSIX terminal management calls to configure the ports.
65.
Write a client-server application which, on request, transfers a large file via sockets.
Reimplement the same application using shared memory. Which version do you expect
to perform better? Why? Conduct performance measurements with the code you have
written and using different file sizes. What are your observations? What do you think
happens inside the Linux kernel which results in this behavior?
66.
Implement a basic user-level threads library to run on top of Linux. The library API
should contain function calls like
mythreads
init
,
mythreads
create
,
mythreads
join
,
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