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The size(1) command reports the sizes (in bytes) of the text, data, and bss segments.You can now buy a digital copy of all 12 Command & Conquer games from the EA Origin Store. The Heap area is shared by all shared libraries and dynamically loaded modules in a process. The Heap area is managed by malloc, realloc, and free, which may use the brk and sbrk system calls to adjust its size (note that the use of brk/sbrk and a single вЂњheap areaвЂќ is not required to fulfill the contract of malloc/realloc/free they may also be implemented using mmap to reserve potentially non-contiguous regions of virtual memory into the processвЂ™ virtual address space). The heap area begins at the end of the BSS segment and grows to larger addresses from there. Heap is the segment where dynamic memory allocation usually takes place. Each time a recursive function calls itself, a new stack frame is used, so one set of variables doesnвЂ™t interfere with the variables from another instance of the function.

This is how recursive functions in C can work. The newly called function then allocates room on the stack for its automatic and temporary variables. Each time a function is called, the address of where to return to and certain information about the callerвЂ™s environment, such as some of the machine registers, are saved on the stack. Stack, where automatic variables are stored, along with information that is saved each time a function is called.

The set of values pushed for one function call is termed a вЂњstack frameвЂќ A stack frame consists at minimum of a return address. A вЂњstack pointerвЂќ register tracks the top of the stack it is adjusted each time a value is вЂњpushedвЂќ onto the stack.

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On the standard PC x86 computer architecture, it grows toward address zero on some other architectures, it grows in the opposite direction. The stack area contains the program stack, a LIFO structure, typically located in the higher parts of memory. (With modern large address spaces and virtual memory techniques they may be placed almost anywhere, but they still typically grow in opposite directions.)

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The stack area traditionally adjoined the heap area and grew in the opposite direction when the stack pointer met the heap pointer, free memory was exhausted. Uninitialized data starts at the end of the data segment and contains all global variables and static variables that are initialized to zero or do not have explicit initialization in source code.ДЇor instance, a variable declared static int i would be contained in the BSS segment.ДЇor instance, a global variable declared int j would be contained in the BSS segment. Uninitialized data segment often called the вЂњ bssвЂќ segment, named after an ancient assembler operator that stood for вЂњ block started by symbol.вЂќ Data in this segment is initialized by the kernel to arithmetic 0 before the program starts executing And a global C statement like const char* string = вЂњhello worldвЂќ makes the string literal вЂњhello worldвЂќ to be stored in the initialized read-only area and the character pointer variable string in the initialized read-write area.Д®x: static int i = 10 will be stored in the data segment and global int i = 10 will also be stored in data segment global) would be stored in the initialized read-write area. This segment can be further classified into the initialized read-only area and the initialized read-write area.ДЇor instance, the global string defined by char s = вЂњhello worldвЂќ in C and a C statement like int debug=1 outside the main (i.e. Note that, the data segment is not read-only, since the values of the variables can be altered at run time. A data segment is a portion of the virtual address space of a program, which contains the global variables and static variables that are initialized by the programmer. Initialized data segment, usually called simply the Data Segment.

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