BSS (Block Started by Symbol) usually refers to an area of memory that is used to hold uninitialized global variables and static variables in the program. Features: Read and write, the BSS section will automatically clear 0 before the program executes. Therefore, the uninitialized global variable is 0 before the program executes.
Data segment: Data segment usually refers to an area of memory that is used to hold the initialized global variables in the program. The data segment belongs to static memory allocation.
Code Snippets: Code segment/text segment usually refers to an area of memory that is used to store program execution code. The size of this area is determined before the program runs, and the memory area is usually read-only, and some schemas allow the code snippet to be writable, which allows the program to be modified. In a code snippet, it is also possible to include some read-only constant variables, such as String constants.
Heap: A heap is used to store a dynamically allocated memory segment in a process run, which is not fixed in size and can be dynamically expanded or scaled down. When a process calls a function such as malloc to allocate memory, the newly allocated memory is dynamically added to the heap (heap is expanded), and freed memory is removed from the heap when memory is freed (heap is scaled down).
Stack : Stacks are also called stacks, which are local variables that are temporarily created by the user's program, that is, the variables defined in the parentheses "{}" (but not the variables that are static declarations, static means that the variables are stored in the data segment). In addition, when a function is called, its arguments are also pressed into the process stack that initiates the call, and the return value of the function is stored back to the stack when the call ends. Due to the advanced first-out features of the stack, the stack is particularly handy for saving/recovering call sites. In this sense, we can think of stacks as a memory area where temporary data is stored and exchanged
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In Linux system memory allocation
