C語言測試內存分佈地址小Demo

#include <stdio.h>
#include<malloc.h>
#include<unistd.h>

int bss_var0;                //未初始化全局變量--BSS段
int data_var0=1;             //已初始化全局變量--數據段
static int data_var1 = 1;    //已初始化靜態全局變量--數據段
static int bss_var1;         //未初始化靜態全局變量--BSS段

int main(){
	static int data_var2=4;         //已初始化靜態變量--數據段
	static int bss_var2;            //未初始化靜態變量--BSS段
	
	int stack_var0=2;
	int stack_var1=3;

	char* p = "123456";             //"123456"--代碼段

	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;
}