Dynamic Allocation and
Pointer:
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What Are Pointers
Pointers are basically the same as any other
variable. However, what is different about them is that instead of
containing actual data, they contain a pointer to the memory location
where information can be found. This is a very important concept.
Many programs and ideas rely on pointers as the basis
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Array Of
Structures:
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C Structure is collection of different datatypes ( variables )
which are grouped together. Whereas, array of structures is nothing
but collection of structures. This is also called as structure array
in C.
Example:
This program is used to store and access “id, name and
percentage” for 3 students. Structure array
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Socket System
Calls:
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Let’s look at a call to socket() (the includes required are
sys/types.h and sys/socket.h):
int socket(int domain, int type,
int protocol);
A successful call to socket() returns a descriptor
that will be used for end-point communication. The first argument,
domain, specifies a communication domain — the protocol famil
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While Loop:
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/*C program to demonstrate the working of while loop*/
#include <stdio.h>
int main()
{
int number,factorial;
printf("Enter a number.\n");
scanf("%d",&number);
factorial=1;
while (number>0)
{
factorial=factorial*number;
--number
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A Small notes on Internet Protocol
(IP):
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TCP/IP includes a wide range of protocols which are used for a
variety of purposes on the network. The set of protocols that are a
part of TCP/IP is called the TCP/IP protocol stack or the TCP/IP
suite of protocols. The Network layer is also know as the internet
layer. The internet layer is a group of internetworking m
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Linux Process
creation:
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Process Descriptors:
The kernel maintains info about each
process in a process descriptor, of type task_struct.
See
include/linux/sched.h
Each process descriptor contains info such
as run-state of process, address space, list of open files, process
priority etc…
Process State:
Consists of an array of
mutually ex
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A small note on
Protocol:
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Application layer is the top most layer in OSI and TCP/IP layered
model. This layer exists in both layered Models because of its
significance, of interacting with user and user applications. This
layer is for applications which are involved in communi
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A small note on Linux
Kernel:
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kernel is the innermost portion of the operating system, where
user interface is the outer portion. kernel is the core internal, the
software that provides the basic services for all the other parts of
the system, manage hardware and distributes system resources.
applications running on the system communicate with th
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C Structure in
Detail:
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C Structure is a collection of different data types which are
grouped together and each element in a C structure is called member.
• If you want to access structure members in C, structure
variable should be declared.
• Many structure variables can be
declared for same structure and memory will be allocated for each
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C Pointers in
Detail:
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Pointers have many but easy concepts and they are very important
to C programming. There are following few important pointer concepts
which should be clear to a C programmer:
Passing pointers to
functions in C:
C programming language allows you to pass a
pointer to a function. To do so, simply declare the function pa
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A note on Linux
Signal:
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signal:
Signals are software interrupts.
A robust program
need to handle signals. This is because signals are a way to deliver
asynchronous events to the application.
A user hitting ctrl+c, a
process sending a signal to kill another process etc are all such
cases where a process needs to do
signal handling.
Li
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