C语言测试内存分布地址小Demo

Myth丶恋晨 2021-12-05 16:08 215阅读 0赞

#include <stdio.h>
    #include<malloc.h>
    #include<unistd.h>
    
    int bss_var0;                //未初始化全局变量--BSS段
    int data_var0=1;             //已初始化全局变量--数据段
    static int data_var1 = 1;    //已初始化静态全局变量--数据段
    static int bss_var1;         //未初始化静态全局变量--BSS段
    
    int main(){
    	static int data_var2=4;         //已初始化静态变量--数据段
    	static int bss_var2;            //未初始化静态变量--BSS段
    	
    	int stack_var0=2;
    	int stack_var1=3;
    
    	char* p = "123456";             //"123456"--代码段
    
    	printf("below are addresses of types of process's mem\n");
    	printf("Text location:\n");
    	printf("\tAddress of main(Code Segment):%p\n", main);
    	printf("\tNew end of \"123456\"(Code Segment):%p\n",p);
    	printf("____________________________\n");
    
    	printf("Data Location:\n");
    	printf("\tAddress of data_var0(Data Segment):%p\n",&data_var0);
    	printf("\tAddress of data_var1(Data Segment):%p\n",&data_var1);
    	printf("\tNew end of data_var2(Data Segment):%p\n",&data_var2);
    	printf("____________________________\n");
    
    	printf("BSS Location:\n");
    	printf("\tAddress of bss_var1:%p\n",&bss_var1);
    	printf("\tAddress of bss_var0:%p\n",&bss_var0);
    	printf("\tAddress of bss_var2:%p\n",&bss_var2);
    	printf("____________________________\n");
    
    	printf("Heap Location:\n");
    	char *b = sbrk((ptrdiff_t)0);
    	printf("\tInitial end of heap:%p\n",b);
    	brk(b+4);
    	b=sbrk((ptrdiff_t)0);
    	printf("\tNew end of heap:%p\n",b);
    	char *b1 = malloc(1024);         //
    	printf("\tNew end of heap:%p\n",b1);
    	printf("____________________________\n");
    
    	printf("Stack Location:\n");
    	printf("\tInitial end of stack:%p\n",&stack_var0);
    	printf("\tnew end of stack:%p\n",&stack_var1);
    	printf("____________________________\n");
    
    	return 0;
    }