在 C 程序中，我有 2 个程序，一个用于将字符串存储在共享内存中，另一个程序是通过访问共享内存来打印相同的字符串。
program 1->
printf("\n SENDER ADDRESS");
printf("\nTHE ADDRESS IS %p",addr1);
printf("\nENTER THE MESSAGE:");
scanf("%s",addr1);
printf("\nMESSAGE STORED IN %p IS %s",addr1,addr1);
program->2
I am having the same text body in program 2 . **BUT IT IS PRINTING THE LOGICAL ADDRESS. HENCE IN THE OUTPUT IAM GETTING 2 DIFFERENT LOGICAL ADRESS. BUT INSTEAD OF THAT IF I WANT TO HAVE SAME PHYSICAL ADDRESS(TO SATISFY THE COLLEGE PROFFESSOR)HOW CAN I DO.**
PLEASE HELP....
PROGRAM 1:
#include<sys/types.h>
#include<string.h>
#include<sys/ipc.h>
#include<sys/shm.h>
#include<stdio.h>
main()
{
key_t key;
int shmid;
char* addr1;
key = ftok("/home/tamil/myc/pws.c",'T');
shmid = shmget(key,128*1024,IPC_CREAT|SHM_R|SHM_W);
addr1 = shmat(shmid,0,0);
printf("\nIPC SHARED MEMORY");
printf("\n SENDER ADDRESS");
printf("\nTHE ADDRESS IS %p",addr1);
printf("\nENTER THE MESSAGE:");
scanf("%s",addr1);
printf("\nMESSAGE STORED IN %p IS %s",addr1,addr1);
}
PROGRAM 2:
#include<sys/types.h>
#include<string.h>
#include<sys/ipc.h>
#include<sys/shm.h>
#include<stdio.h>
main()
{
int shmid;
char* addr1;
key_t key;
key = ftok("/home/tamil/myc/pws.c",'T');
shmid = shmget(key,128*1024,SHM_R|SHM_W);
addr1 = shmat(shmid,0,0);
printf("\nIPC SHARED MEMORY");
printf("\n SENDER ADDRESS");
printf("\nTHE ADDRESSS IS %p",addr1);
printf("\nMESSAGE STORED IN %p IS %s",addr1,addr1);
}
output:
tamil@ubuntu:~/myc$ cc shmget.c
tamil@ubuntu:~/myc$ ./a.out
IPC SHARED MEMORY
SENDER ADDRESS
**THE ADDRESS IS **0xb786c000****
ENTER THE MESSAGE:helloworld
MESSAGE STORED IN **0xb786c000** IS helloworldtamil@ubuntu:~/myc$ cc shmget2.c
tamil@ubuntu:~/myc$ ./a.out
IPC SHARED MEMORY
SENDER ADDRESS
**THE ADDRESSS IS **0xb7706000****
MESSAGE STORED IN **0xb7706000** IS helloworldtamil@ubuntu:~/myc$