A8

AIM   :     Inter-process Communication using Shared Memory using System .Application to demonstrate: Client and Server Programs in which server process creates a shared memory segment and writes the message to the shared memory segment. Client process reads the message from the shared memory segment and displays it to the screen

p8.c(CLIENT)

#include<stdio.h>

#include<sys/ipc.h>

#include<sys/types.h>

#include<sys/shm.h>

#include<stdlib.h>

#define SHMSZ 27

int main()

{

int shmid;

key_t key;

char *shm,*s;

key=5678;

if((shmid=shmget(key,SHMSZ,0666))<0)

{

perror("Shmget");

exit(1);

}

if((shm=shmat(shmid,NULL,0))==(char *)-1)

{

perror("shmat");

exit(1);

}

for(s=shm;*s!=NULL;s++)

putchar(*s);

putchar('\n');

*shm='*';

exit(0);

}

p8b.c (server)

#include<stdio.h>

#include<stdlib.h>

#include<sys/types.h>

#include<sys/ipc.h>

#include<sys/shm.h>

#include<stdlib.h>

#include<unistd.h>

#define SHMSZ 27

int main()

{

char c;

int shmid;

key_t key;

char *shm,*s;

key=5678;

if((shmid=shmget(key,SHMSZ,IPC_CREAT|0666))<0)

{

perror("Shmget");

exit(1);

}

if((shm=shmat(shmid,NULL,0))==(char *)-1)

{

perror("shmat");

exit(1);

}

s=shm;

for(c='a';c<='z';c++)

*s++=c;

*s=NULL;

while(*shm!='*')

sleep(1);

exit(0);

}

/*