Tagged Questions

An operating System (OS) is a basic software whose rule is to intermediate software requisitions for resources and the hardware available, manage input/output, memory allocation/deallocation, file systems, among other basic tasks a device (not necessarily a computer) should do.

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2answers
143 views

How absolute code get generated

I have gone through with memory managment concepts of Operating system concept of Galvin , I have read a statment : If you know at compile time where the process will reside in memory, then absolute ...
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0answers
5 views

Windows Key Mapper Software

I'm searching for a good mapper that let me add or replace some windows shortcuts through keys.. My keyboard doens't have Fn Key and so, I love for example to do this.. Windows Key + Up Arrow - ...
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0answers
7 views

Round Robin Scheduling with WRITE(disk) condition

Round Robin Problem. Time Quantum = 5 Proc At St WT RT TT CS p1 0 8 p2 5 5 p3 8 9 p4 13 5 p5 15 8 Process number, Arrival Time(At), Service Time(St), Waiting ...
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2answers
83 views

Can i use c/c++ to communicate with a hardware device? [closed]

i was wondering if its possible to use c/c++ to communicate with a hardware device such as a pci card just like a windows application would? Or this type of thing too hard for an individual to do ...
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0answers
23 views

How can detect OS of a remote server [closed]

How we can detect Operating System of a remote server that we have only it's host name or IP address using PHP languages? I search but only find OS detection of clients not servers. please help me.
3
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2answers
68 views

Mobile operating systems theory textbooks?

There are many good textbooks that cover the theory of operating systems (e.g. Silberschatz, Tanenbaum), but I am not aware of any that give a mobile operating systems perspective. For example, I ...
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4answers
92 views

contiguously space on hard disk - NTFS

My question is about file allocation methods on NTFS Fs. I have two main questions - When i create a file on NTFS, is it stored contiguously on the physical hard disk? if not - is there a way to ...
1
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0answers
20 views

Automated OS Testing for Applications?

Is there any service like Travis-CI but for different OS's so that I can make sure a project builds - I'm specifically looking at those special build options that have to be configured for different ...
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votes
5answers
5k views

Store value of os.system or os.popen

I want to grep the error's out of a log file and save the value as an error. When I use: errors = os.system("cat log.txt | grep 'ERROR' | wc -l") I get the return code that the command worked or ...
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1answer
18 views

How does Kernel protect Mode Bits (PSW) from being modified by User Program?

I understand that the CPU distinguishes Kernel Mode and User Mode based on the Program Status Word, but suppose that a User Program was attempting to gain unauthorised access to invoke system calls by ...
1
vote
1answer
11 views

Is it possible to have priority inversion with two processes?

The usual example gives three processes, but shouldn't it be possible with only two processes? Let us assume we have two processes, p3 and p1. p3's priority is less than p1. p3 is currently in the ...
3
votes
3answers
76 views

Understanding Malloc implementation

Does the memory remains assigned if I didn't free the allocated memory using malloc even after exiting the program? It's running in Ubuntu Linux 14.
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4answers
59 views

What is the Most Portable programming language to use [closed]

I have been developing a small java program over the last few weeks and during testing i have noticed that some computers i have been testing it on do not have Java installed. This got me thinking ...
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0answers
5 views

Per-Process and System-wide Open Table entry Creation Order?

I was Looking at these two instances of open tables in a text book on operating systems, and it explains them well bit it skips over creation order. So my question is: An entry in a Per-Process ...
0
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1answer
21 views

how to run the windows batch file at background even the system is logged off

We need to run a batch file at the background in windows machine. The scripts needs to run even the system is logged off. Also the script should restart when the system restarted. Thanks in advance. ...

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