Search Results

@Shamrock

Yes infact, I believe I was getting confused between system calls and interrupts.

More specifically, where system call handling and exception handling meet, that is what portion of...

One more clarification,
From what i understand, there are a limited number of exceptions made available. But the no. of system calls is quite high,

If the dispatch table is indexed via the...

Hmm so as I understand it,

int 0x80 causes the change to the kernel mode.

here 0x80 is used to index the IDT to get the location of the ISR.

What does the ISR location usually contain?
...

Could this post be moved to the Unix for Dummies Q&A?

I recently went through Understanding the linux kernel, to get an idea of how system calls and interrupts function in an x86 based machine.

However, the level of detail has left me slightly...

My initial corruption was due to lack of accounting for that 1 index. Anyways, even when I accounted for it, I was getting the corruption, so I concluded that this lack of index was not the root...

Corona : you were spot on. The FD array was getting corrupted.
The array was dynamically allocated.

However, I tried statically allocating the array and it worked like a charm. The interesting...

I am trying to write code for a client-server scenario using AF_INET sockets..

As is usually the case, everything works fine and dandy on my machine, but gives me the following error at runtime:
...

Good news everyone!
I got my shell to work in almost all cases. There are one or two bugs which I need to iron out, which I'll have a crack at tonight. Thank you for all your inputs!

Why should'nt builtins work in the middle of the pipe?

In my home directory,
I tried ls | set | grep path
O/P given was:

path (/usr/local/sbin /usr/local/bin /usr/sbin /usr/bin /sbin /bin...

Ok, I went the other way round,

I implemented all builtins first, thinking I could use them as needed in my pipes.
I tried to mesh that in with the prev eg. which you gave of the IPC via pipes....

I am on Ubuntu 64 11.04. Lots to digest for one post. :)
Will try out some stuff and get back.

---------- Post updated at 07:49 PM ---------- Previous update was at 07:13 PM ----------

Thank...

Regarding the last portion,



What I meant to say is I am having a hard time debugging the child process once it execs, as gdb is attached to the parent.
(I thought as there is no explicit...

@Thanks alister.

The clarification was very helpful indeed.
While we are on the subject, (and I know there are scattered resources available on google for this), how is the pipe underlying...

@Corona

That is one elegant piece of code. Initially, I was going to bug you with added clarifications on how the code was working, but then decided that after so much effort on your part, the...

@Corona Apologise if the bumping was excessive..
The fork is done as a part of the line, run the command in a subshell.
Thanks for the explanation though, let me ensure if I am correctly closing...

I am trying to create a csh clone, but am having problems implementing piped commands. Specifically, the below code simply hangs after input of ls | grep <text>
It does however filter the output and...