Mohanraj
INTERPROCESS COMMUNICATION
USING PIPES
AIM:
To implement the concept of interprocess
communication using pipes using c program.
ALGORITHM:
1. create
the pipe and create the process.
2. get
the input in the main process and pass the output to the child process using
pipe.
3. perform
the operation given in the child process and print the output.
4. stop
the program.
PROGRAM:
#include<stdio.h>
#include<unistd.h>
#include<string.h>
main()
{
int
p1[2],p2[2],p3[2],p4[2];
int i,j=0,k=0,l=0;
char
r[10],s[10],t[10],u[10];
printf("\t
PROCESS 1.ENTER THE STRING");
scanf("%s",r);
pipe(p1);
pipe(p2);
write(p1[1],r,sizeof(r));
write(p2[1],r,sizeof(r));
int a=fork();
if(a==0)
{
printf("\n\t
PROCESS 2:it splits the given string\n");
read(p1[0],r,sizeof(r));
int n=strlen(r);
for(i=0;i<n/2;i++)
{
s[i]=r[i];
}
for(i=n/2;i<=n;i++)
{
t[j++]=r[i];
}
pipe(p3);
pipe(p4);
write(p3[1],s,sizeof(s));
write(p4[1],t,sizeof(t));
int b=fork();
if(b==0)
{
printf("p4
%d\t",getpid());
printf("p2
%d\n",getppid());
read(p3[0],s,sizeof(s));
printf("\t
PROCESS 4:sub string \t %s \t",s);
printf("no of
char=%d \n",strlen(s));
}
else
{
int c=fork();
if(c==0)
{
printf("p5
%d\t",getpid());
printf("p2
%d\n",getppid());
read(p4[0],t,sizeof(t));
printf("\t
PROCESS 5:sub string \t %s \t",t);
printf("no of
char=%d \n",strlen(t));
}
else
{
wait();
printf("p2
%d\t",getpid());
printf("p1
%d\n",getppid());
} }}
else
{
wait();
int d=fork();
if(d==0)
{
printf("p3
%d\t",getpid());
printf("p1
%d\n",getppid());
read(p2[0],r,sizeof(r));
for(i=strlen(r)-1;i>=0;i--)
{
u[l++]=r[i];
}
for(i=0;i<strlen(r);i++)
{
if(u[i]==r[i])
k++;
else
continue;
}
if(k==strlen(r))
printf("\t
PROCESS 3: the given string is palindrome\n");
else
printf("\t
PROCESS 3: the given string is not palindrome\n");
}
else
{
printf("p1
%d\t",getpid());
printf("kernal %d\t\n",getppid());
}
}}
OUTPUT:
Process 1:
enter the string ARUN
Process 2:
it splits the string
P4 8137 p2
8136
Process 3:
sub string a r no of char=2
P5 8138 p2
8136
Process 4;
substring u n no of char=2
P2 8136 p1
8132
P3 8139 p1
8132
Process 3:
the given string is not palindrome
Process 1:
enter the string MADAM
Process 2:
it splits the string
P4 8137 p2
8136
Process 4:
sub string m a no of char=2
P5 8138 p2
8136
Process 5:
sub string dam no of char=3
P2 8136 p1
8132
P3 8139 p1
8132
Process 3:
the given string is palindrome
Posted in: C / C++ Program
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