Linux Programing

原创于 2008-01-21 12:30:04 发布 · 138 阅读

CC 4.0 BY-SA版权

本文详细介绍了进程中的五种主要内存区域：代码段存放可执行指令；初始化数据段存放已初始化的全局变量；零初始化数据段存放默认初始化为零的数据；堆区通过动态分配内存获得；栈区用于局部变量的分配。

For a working definition,we've said that a process is a running program.This means that the operating system h-as loaded the executable file for the program into memory,has arranged for it to have access to its command-lin-e arguments and environment variables,and has started it running.A process has five conceptually different are-as of memory allocated to it:

Code:

Often referred to sa the text segment,this is the area in which the executable instructions reside.

Initialized data:

Statically allocated and global data that are initialized with nonzero values live in the data segment.

Zero-initialized data:

Global and statically allocated data that are initialized to zero by default are kept in what is colloquially called the SS area of the process.

Heap:

The heap is where dynamic memory(obtained by malloc() and friends)comes from.

Stack:

The stack segment is where local variables are allocated.