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How to prevent unauthorized memory access in c?

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2016-11-21 03:41:16
2016-11-21 03:41:16

Make sure a password has been set on the computer and make sure its one that you know is easy to memorize but hard for others to find out. firewall - software firewall is a program that is stored into the computer which protects the computer from unauthorized incoming and outgoing data. virus protection program - that helps stop or detect and fix virus problems from happening.

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You access memory with a pointer or a reference to the memory. To allocate memory dynamically, use calloc or malloc (C or C++) or new (C++ only).

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A pointer in C++ is the same as a pointer in C -- it is a variable that is used to store a memory address and which allows indirect access to that memory address. When a pointer is not in use, it must be zeroed or nullified by assigning the NULL value, thus preventing indirect access to invalid memory.

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1) Using inline assembly language functions feature in C we can directly access system registers. 2) C programming also supports high level language features. 3) C Programming is used to access memory directly using pointer.

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C language is a middle level language, a middle language is one which somehow allows you to access your computer memory directly. Where as Java and C# are completely highlevel language as they dont allow you to directly access your computer memory, Assembly Language is said to be the low level language as it allow the the direct access of memory. you can read more on C language here: http://thetechnofreaks.com/2011/08/23/the-basics-welcome-to-the-world-of-programming/ Actually, there are no 'middle level languages', machine code and Assembly is low level, everything else is high level. And of course you cannot break out from your virtual memory space using C (or any other language). It is called 'protected mode' for a reason.

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There is no memory management operator in C++ -- it is an unmanaged language. You use the C++ new operator to allocate memory, and use the C++ delete operator to release previously allocated memory.

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Registers >> Cache >> Main Memory >> Magnetic disk >> Magnetic tape โ€ข As one goes down the hierarchy, the following occur: a . Decreasing cost per bit b . Increasing capacity c . Increasing access time d . Decreasing frequency of access to the memory by the processor

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# Manual memory allocation/deallocation # (Semi-) direct access to registers

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A dangling pointer is one that points to a memory location but the memory itself has been freed or released back to the system. The memory may still contain valid information, but the system can overwrite the data at any time so any attempt to access that memory via the dangling pointer could prove disastrous. As soon as memory is released, the pointer is invalid -- because the memory it points to is potentially invalid. To prevent this, always nullify pointers (set them to point at memory address zero) when they are no longer required, immediately after releasing the memory they point to. There are occasion when this is not necessary, such as when releasing a member pointer in a class destructor, but if a pointer is re-used, it must be initialised before being accessed again.

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You do not access MS Access from C you do it from windows by using MS Access api calls. MS Access does not run on a computer running Linux, QNX or DOS etc. but they can all be programmed in C

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Java does not have the concept of Reference Variables. We cannot access the memory location where the data is stored in Java.

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Yes, C++ has pointers, which are references to memory locations. which are variables that store memory addresses, or NULL (zero). If the pointer is non-NULL, the pointer is said to dereference the object (or variable) residing at the stored memory address, which permits indirect access to that object so long as the object remains in scope.

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New and Delete are the memory management operators in c++,like c language we use malloc() and calloc() functions to allocate memory and free() functiong to release the memory similarily we use new to allocate memory in C++ and Delete to release the allocated memory....

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State-of-the-art graphics is usually pushing the boundaries of CPU and memory capacity as graphics become more and more visually impressive. C and C++ allows for very fast code by giving programmers access to low-level operations (such as pointer arithmetic, memory management, etc).

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Being a high level language like java..., C supports direct access to memory as assembly language (which is a low level language) . So C is called mid level language

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In Windows you can use the CreateFileMapping API to create shared memory in one program, and OpenFileMapping to access that memory from another program. For a more generic approach, consider using disk files, pipes or messages.

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Static memory allocation occurs at compile time where as dynamic memory allocation occurs at run time.

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There are no access specifiers in C. All functions and data are public.

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U need to find the DRIVER for C language that will connect to Oracle or Access Database and then access that driver through C program.

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A pointer is simply a variable that stores a memory address. Thus a pointer to an object is simply a variable that stores the memory address of an object. Since pointers are variables, they require memory of their own. Pointers may also be constant, which simply means you cannot change what they point to. Pointers can also be dereferenced to provide indirect access to the memory they point to -- hence they are known as pointers. However, unlike C, pointers are not the same as references. In C++, a reference is simply an alias for a memory address and requires no storage of its own.

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A) Users can unknowingly sever access to shared files or printers.C) Sensitive data could be made available to unauthorized users.Guide to Networking Essentials, Fifth Edition

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Contiguous memory allocation in C programming refers to the assigning of consecutive memory blocks to a process. Contiguous memory allocation is one of the oldest and most popular memory allocation schemes in programming.

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yes, In C its possible to allocate array in expanded memory at run time

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C. Richard Puff has written: 'Memory organization and structure' -- subject(s): Memory

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-Connect your PSP to your computer using a Usb cable. -You may also use a memory stick duo adaptor supported by some computers. -Access the PSP's memory stick -Photos go into C:/(Your memory stick drive)/PSP/PHOTO Create the folders if you don't have them.


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