Storing Lower case Message in Shared Memory-I

#include<sys/types.h>

#include<sys/ipc.h>

#include<sys/msg.h>

#include<sys/shm.h>

#include<unistd.h>

#include<stdio.h>

#include<sys/stat.h>

#include<string.h>

main()

{

int shmid,i;

char *pa,a[1000];

shmid=shmget((key_t)1300,1024,0600|IPC_CREAT);

if(shmid==-1)

{printf("shmget failed");

return;

}

pa=(char*)shmat(shmid,0,0);

if(pa==(void *)-1)

{

printf("shmat failed");

return;

}

printf("Enter text&press$to terminate\n");

for(i=0;(a[i]=getchar())!='$';i++);

a[i]='\0';

strcpy(pa,a);

printf("The given text is placed into shared memory\n");

}

OUTPUT

[user@localhost ~]$ cc mgsh.c

[user @localhost ~]$ ./a.out

Enter text&press$to terminate

Message stored in shared memory

shared memory programs$

The given text is placed into shared memory

[user @localhost ~]$ 

MarkSheet Preparation Using SharedMemory –II

 PROGRAM:

#include<sys/types.h>

#include<sys/ipc.h>

#include<sys/msg.h>

#include<sys/shm.h>

#include<unistd.h>

#include<stdio.h>

#include<sys/stat.h>

#include<string.h>

struct stud

{char name[25];

int roll,m1,m2,m3,tot;

float avg;

};

main()

{struct stud m,*p;

p=&m;

int shmid;

shmid=shmget((key_t)1300,1024,0660|IPC_CREAT);

if(shmid==-1)

{printf("shmget failed");

return;

}

p=(struct stud *)shmat(shmid,0,0);

if(p==(void *)-1)

{printf("shmat failed");

return;

}

p->tot=p->m1+p->m2+p->m3;

p->avg=(float)p->tot/3.0;

printf("\nNAME: %s",p->name);

printf("\nROLLNO:%d",p->roll);

printf("\nMARK1:%d",p->m1);

printf("\nMARK@:%d",p->m2);

printf("\nMARK#:%d",p->m3);

printf("\nTOTAL:%d",p->tot);

printf("\nAVERAGE:%f",p->avg);

}

OUTPUT:

[user @localhost ~]$ cc cmarsh.c

[user @localhost ~]$ ./a.out

NAME: Kannan

ROLLNO:987

MARK1:89

MARK@:98

MARK#:78

TOTAL:265

AVERAGE:88.333336[user @localhost ~]$

MarkSheet Preparation Using SharedMemory –I

PROGRAM:

#include<sys/types.h>

#include<sys/ipc.h>

#include<sys/shm.h>

#include<unistd.h>

#include<stdio.h>

#include<sys/stat.h>

#include<string.h>

struct stud

{

char name[25];

int roll,m1,m2,m3,tot;

float avg;

};

main()

{

struct stud m,*p;

p=&m;

int shmid;

shmid=shmget((key_t)1300,1024,0600|IPC_CREAT);

if(shmid==-1)

{printf("shmget failed");

return;

}

p=(struct stud *)shmat(shmid,0,0);

if(p==(void *)-1)

{

printf("shmat failed");

return;

}

printf("Enter the name:\n");

scanf("%s",p->name);

printf("Enter the Roll.No:\n");

scanf("%d",&p->roll);

printf("Enter the marks  got in 3 subject: \n");

scanf("%d%d%d",&p->m1,&p->m2,&p->m3);

printf("\nThe given information is placed in shared memory\n");

}

OUTPUT:

[user @localhost ~]$ cc marsh.c

[user @localhost ~]$ ./a.out

Enter the name:

Kannan

Enter the Roll.No:

987

Enter the marks  got in 3 subject:

89 98 78

The given information is placed in shared memory

[user @localhost ~]$

Length of the string using Shared Memory-II

Program:

#include<sys/types.h>

#include<sys/ipc.h>

#include<sys/msg.h>

#include<sys/shm.h>

#include<unistd.h>

#include<stdio.h>

#include<sys/stat.h>

#include<string.h>

main()

{

int shmid,i,len;

char *pa,a[1000];

shmid=shmget((key_t)1300,1024,0600|IPC_CREAT);

if(shmid==-1)

{printf("shmget failed");

return;

}

pa=(char*)shmat(shmid,0,0);

if(pa==(void *)-1)

{

printf("shmat failed");

return;

}

len=strlen(pa);

printf("\nThe length of the text is : %d\n",len);

}

OUTPUT:

[user @localhost ~]$ cc lenshm.c

[user @localhost ~]$ ./a.out

The length of the text is : 54

[user @localhost ~]$

Length of the string using Shared Memory

Program

#include<sys/types.h>

#include<sys/ipc.h>

#include<sys/msg.h>

#include<sys/shm.h>

#include<unistd.h>

#include<stdio.h>

#include<sys/stat.h>

#include<string.h>

main()                 

{

int shmid,i;

char *pa,a[1000];

shmid=shmget((key_t)1300,1024,0600|IPC_CREAT);

if(shmid==-1)

{printf("shmget failed");

return;

}

pa=(char*)shmat(shmid,0,0);

if(pa==(void *)-1)

{

printf("shmat failed");

return;

}

printf("Enter text&press$to terminate\n");

for(i=0;(a[i]=getchar())!='$';i++);

a[i]='\0';

strcpy(pa,a);

printf("The given text is placed into shared memory\n");

}

OutPut

[user@localhost ~]$ cc mgsh.c

[user @localhost ~]$ ./a.out

Enter text&press$to terminate

Message stored in shared memory

shared memory programs$

The given text is placed into shared memory

[user @localhost ~]$ 

Shell Program To Extract the Message from Shared Memory

#include<sys/types.h>

#include<sys/ipc.h>

#include<sys/msg.h>

#include<sys/shm.h>

#include<unistd.h>

#include<stdio.h>

#include<sys/stat.h>

#include<string.h>

main()

{

int shmid,i;

char *pa,a[1000];

shmid=shmget((key_t)1300,1024,0600|IPC_CREAT);

if(shmid==-1)

{printf("shmget failed");

return;

}

pa=(char*)shmat(shmid,0,0);

if(pa==(void *)-1)

{

printf("shmat failed");

return;

}

printf("The text recived is: \n");

puts(pa);

}

Output:

[user@localhost ~]$ cc emgsh.c

[user@localhost ~]$ ./a.out

The text recived is:

Message stored in shared memory

shared memory programs

[user@localhost ~]$