Real-Ying

打印不同段数据的位置 

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

extern char** environ;

int global1;
int global2 = 1;

int main()
{
    //1.环境变量
    char **env = environ;
    while(*env){
        printf("(%p) (%p) %s\n",env,*env,*env);   //%p打印指针位置(所指地址)
        env++;
    }
    printf("\n");
    //2.全局变量(未初始化和初始化)
    printf("%p\n",&global1);
    printf("%p\n\n",&global2);
    //3.栈
    int local;
    char *localc = (char*)malloc(10);  //指针在栈中，指针内容在堆中
    printf("%p\n",&local);
    printf("%p\n\n",&localc);
    //4.堆
    printf("%p\n\n",localc);
    return 0;
}
我的环境，输出如下： 1 chenximing@chenximing-MS-7823:~$ ./a.out
 //首先打印了 环境表地址 环境变量地址 环境变量字符串
 2 (0x7ffe4aa6f4c8) (0x7ffe4aa7078a) XDG_SESSION_ID=1
 3 (0x7ffe4aa6f4d0) (0x7ffe4aa7079b) TERM=xterm-256color
 4 (0x7ffe4aa6f4d8) (0x7ffe4aa707af) SHELL=/bin/bash
 5 (0x7ffe4aa6f4e0) (0x7ffe4aa707bf) XDG_SESSION_COOKIE=526d72c400c09a742df8809a58e50d0e-1529375799.783462-1767108743
 6 (0x7ffe4aa6f4e8) (0x7ffe4aa70810) SSH_CLIENT=192.168.2.1 53068 22
 7 (0x7ffe4aa6f4f0) (0x7ffe4aa70830) SSH_TTY=/dev/pts/25
 8 (0x7ffe4aa6f4f8) (0x7ffe4aa70844) USER=chenximing

 9 ...

10 (0x7ffe4aa6f508) (0x7ffe4aa70d75) MAIL=/var/mail/chenximing
11 (0x7ffe4aa6f510) (0x7ffe4aa70d8f) PATH=/home/chenximing/bin:/usr/local/go/bin:/usr/lib/jvm/jdk1.8.0_144/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/chenximing/bin
12 (0x7ffe4aa6f518) (0x7ffe4aa70e47) QT_QPA_PLATFORMTHEME=appmenu-qt5
13 (0x7ffe4aa6f520) (0x7ffe4aa70e68) PWD=/home/chenximing
14 (0x7ffe4aa6f528) (0x7ffe4aa70e7d) JAVA_HOME=/usr/lib/jvm/jdk1.8.0_144
15 (0x7ffe4aa6f530) (0x7ffe4aa70ea1) LANG=zh_CN.UTF-8
16 (0x7ffe4aa6f538) (0x7ffe4aa70eb2) SHLVL=1
17 (0x7ffe4aa6f540) (0x7ffe4aa70eba) HOME=/home/chenximing
18 (0x7ffe4aa6f548) (0x7ffe4aa70ed0) GOROOT=/usr/local/go
19 (0x7ffe4aa6f550) (0x7ffe4aa70ee5) LANGUAGE=zh_CN:zh
20 (0x7ffe4aa6f558) (0x7ffe4aa70ef7) LOGNAME=chenximing
21 (0x7ffe4aa6f560) (0x7ffe4aa70f0a) CLASSPATH=.:/usr/lib/jvm/jdk1.8.0_144/lib
22 (0x7ffe4aa6f568) (0x7ffe4aa70f34) SSH_CONNECTION=192.168.2.1 53068 192.168.2.4 22
23 (0x7ffe4aa6f570) (0x7ffe4aa70f64) LC_CTYPE=zh_CN.UTF-8
24 (0x7ffe4aa6f578) (0x7ffe4aa70f79) GOPATH=~/go
25 (0x7ffe4aa6f580) (0x7ffe4aa70f85) LESSOPEN=| /usr/bin/lesspipe %s
26 (0x7ffe4aa6f588) (0x7ffe4aa70fa5) XDG_RUNTIME_DIR=/run/user/1000
27 (0x7ffe4aa6f590) (0x7ffe4aa70fc4) LESSCLOSE=/usr/bin/lesspipe %s %s
28 (0x7ffe4aa6f598) (0x7ffe4aa70fe6) _=./a.out
29 //以下是各字段变量的地址
30 0x60106c
31 0x601050
32 
33 0x7ffe4aa6f3bc
34 0x7ffe4aa6f3c0
35 
36 0x1725010

画图表示：

 

posted on 2019-11-24 17:39  Real-Ying  阅读(174)  评论(0)  编辑  收藏  举报

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