OS Shared Memory C Program

Operating Systems Lab Manual / OS Shared Memory C Program

Program Name

Theory

Shared memory is a memory shared between two or more processes.Using pointers to shared memory
we read and write data to shared memory.

shmat():Shared memory Attach
shmdt():Shared memory Dettach

Program Code

#include<stdio.h> 
#include<sys/types.h> 
#include<sys/ipc.h> 
#include<string.h> 
#include<stdlib.h> 
#include<sys/msg.h> 
int main()
{
int shmid,pid; char *ptr;
shmid=shmget((key_t)27,10,IPC_CREAT| 0666); 
ptr=(char *) 
shmat(shmid,0,0);
printf("\nEnter a Message\n"); 
read(0,ptr,10);
write(1,ptr,10); 
shmdt(ptr);
return 0;
}

Input:
Enter a Message
Data sent to shared Memory

Output:
Data sent to shared Memory

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