NAME:T.KRISHNA ANANTHI

REG.NO:1041733

INTERPROCESS COMMUNICATIONS USING SHARED MEMORY,

PIPE AND MESSAGE QUEUES.

1.Develop an application for getting a name in parent and convert it into uppercase in

child using shared memory.

#include<unistd.h>

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<ctype.h>

#include<sys/ipc.h>

#include<sys/shm.h>

#include<sys/types.h>

#include<sys/wait.h>

#include<stdio_ext.h>

int main()

{

int id,n,pid,i;

char *a,*b;

id=shmget(111,50,IPC_CREAT|00666);

pid=fork();

if(pid>0)

{

a=shmat(id,NULL,0);

printf("\nEnter the string...\t");

gets(a);

wait(NULL);

shmdt(a);

}

else

{

sleep(5);

b=shmat(id,NULL,0);

n=strlen(b);

printf(“\n\n”);

for(i=0;i<n;i++)

printf("%c",toupper(b[i]));

shmdt(b);

}

return 0;

}

[ananthi@ananthi ~]$ gcc -Wall 7a.c -o a

[ananthi@ananthi ~]$ ./a out

Enter the string... krishna ananthi

KRISHNA ANANTHI[ananthi@ananthi ~]$

2.Develop an echo client / server application using shared memory.

//SERVER SIDE

#include<unistd.h>

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<ctype.h>

#include<sys/ipc.h>

#include<sys/shm.h>

#include<sys/types.h>

#include<sys/wait.h>

#include<stdio_ext.h>

int main()

{

int id;

char *a;

id=shmget(111,50,IPC_CREAT|00666);

a=shmat(id,NULL,0);

printf("\nEnter the string in server side..\t");

scanf("%s",a);

printf("\n\nServer waits until client responds...\n\n");

while(a[0]!='$');

printf("\n\nCLIENT::%s",a);

printf("\n\nServer task completed....\n");

return 0;

}

SAMPLE INPUT AND OUTPUT:

[ananthi@ananthi ~]$ gcc -Wall 7bs.c -o a

[ananthi@ananthi ~]$ ./a out

Enter the string in server side.. Serverbusy.....

Server waits until client responds...

CLIENT::$client goes to offline..

Server task completed....

[ananthi@ananthi ~]$

//CLIENT SIDE

#include<unistd.h>

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<ctype.h>

#include<sys/ipc.h>

#include<sys/shm.h>

#include<sys/types.h>

#include<sys/wait.h>

#include<stdio_ext.h>

int main()

{

int id,n;

char *a;

id=shmget(111,50,00666);

a=shmat(id,NULL,0);

n=strlen(a);

printf("\nDisplaying the string in client side wrote by server..\n\nSERVER :: ");

printf("%s",a);

strcpy(a,"$client goes to offline..\n\n");

return 0;

}

SAMPLE INPUT AND OUTPUT:

[ananthi@ananthi ~]$ gcc -Wall 7bc.c -o a

[ananthi@ananthi ~]$ ./a out

Displaying the string in client side wrote by server..

SERVER :: Serverbusy.....[ananthi@ananthi ~]$

3.Develop an application to get a number in child and find the reverse of that number in

parent using pipe.

#include<unistd.h>

#include<stdio.h>

#include<sys/types.h>

#include<stdio_ext.h>

int main()

{

int pid,n,rev=0,fd[2],b;

pipe(fd);

pid=fork();

if(pid==0)

{

printf("\n\nEnter the number..\t");

scanf("%d",&n);

close(fd[0]);

write(fd[1],&n,1);

}

else

{

close(fd[1]);

read(fd[0],&n,1);

while(n>0)

{

rev=(rev*10)+n%10;

n=n/10;

}

printf("\n\nReversed number is %d\n",rev);

}

return 0;

}

SAMPLE INPUT AND OUTPUT:

[ananthi@ananthi ~]$ gcc -Wall 7c.c -o a

[ananthi@ananthi ~]$ ./a out

Enter the number of bits.. 5

Enter the number.. 12345

Reversed number is 54321

[ananthi@ananthi ~]$

4.Develop a client / server chat application using pipes

//SERVER

#include<stdio.h>

#include<sys/types.h>

#include<sys/stat.h>

#include<sys/wait.h>

#include<fcntl.h>

int main()

{

char n[50];

int r,w;

mkfifo("ananthi",00666);

mkfifo("priya",00666);

close(r);

w=open("ananthi",O_WRONLY);

printf("\n\t\tSERVER ANANTHI:\n\n");

gets(n);

write(w,&n,sizeof(n));

while(1)

{

wait(0);

close(w);

r=open("priya",O_RDONLY);

read(r,&n,sizeof(n));

printf("\nCLIENT PRIYA:%s\n",n);

close(r);

w=open("ananthi",O_WRONLY);

printf("\nSERVER ANANTHI:");

gets(n);

write(w,&n,sizeof(n));

}

return 0;

}

SAMPLE INPUT AND OUTPUT:

[ananthi@ananthi ~]$ gcc -Wall 7ds.c -o s

[ananthi@ananthi ~]$ ./s

SERVER ANANTHI:

SERVER ANANTHI: hi mohana..

CLIENT PRIYA: hi krish..

SERVER ANANTHI: how r u ?

CLIENT PRIYA: fine.

SERVER ANANTHI: then wat doing?

CLIENT PRIYA: doing program

SERVER ANANTHI: wat pro??

CLIENT PRIYA: ipc..

SERVER ANANTHI: it is easy??

CLIENT PRIYA: easy only.. do it

SERVER ANANTHI: ok..i will do it..:)

CLIENT PRIYA: that's good..bye tc

SERVER ANANTHI: bye.. gud nite..:) sweet dreams..

[1]+ Stopped ./s

[ananthi@ananthi ~]$

//CLIENT

#include<unistd.h>

#include<stdio.h>

#include<sys/types.h>

#include<fcntl.h>

#include<sys/wait.h>

int main()

{

char n[50];

int r,w;

printf("\t\tCLIENT PRIYA:\n\n");

while(1)

{

wait(0);

close(w);

r=open("ananthi",O_RDONLY);

read(r,&n,sizeof(n));

printf("\nSERVER ANANTHI:\n");

puts(n);

close(r);

w=open("priya",O_WRONLY);

printf("\nCLIENT PRIYA:");

gets(n);

write(w,&n,sizeof(n));

}

return 0;

}

SAMPLE INPUT AND OUTPUT:

[ananthi@ananthi ~]$ gcc -Wall 7dc.c -o c

[ananthi@ananthi ~]$ ./c

CLIENT PRIYA:

SERVER ANANTHI: hi mohana..

CLIENT PRIYA: hi krish..

SERVER ANANTHI: how r u ?

CLIENT PRIYA: fine.

SERVER ANANTHI: then wat doing??

CLIENT PRIYA: doing program

SERVER ANANTHI: wat pro??

CLIENT PRIYA: ipc..

SERVER ANANTHI: it is easy??

CLIENT PRIYA: easy only.. do it

SERVER ANANTHI: ok..i will do it..:)

CLIENT PRIYA: that's good..bye tc

SERVER ANANTHI: bye.. gud nite..:) sweet dreams..

CLIENT PRIYA:

[1]+ Stopped ./c

[ananthi@ananthi ~]$