Use Python for Socket Programming to connect two or more PCs to share a text file.

Problem Statement:

Use Python for Socket Programming to connect two or more PCs to share a text file.

PROGRAM

serverm.py

import socket
import threading


#works for 5 times client trying to connect to it.After 5 clients have accessed it, server stops.
class sc(threading.Thread):
    def __init__(self):
        threading.Thread.__init__(self)
    def run(self):
        threadlock.acquire()
        ch=client.recv(1111)           #RECEIVE choice entered by client

        if ch=='1':                     #client is writing to the server file, temp.txt
            f=open('temp.txt','a+')
            r=client.recv(4096)
            f.write(r+'\n')
            f.close()
        else:
            f=open('temp.txt','a+')      #sending file data to the client from server file.
            msg=f.read()
            client.send(msg)
            f.close()
        threadlock.release()
threadlock=threading.Lock()
s=socket.socket()
s.bind(('localhost',9998))
s.listen(5)                              #5 is the mac number of connections that can be queued for this process
for i in range (0,5):
    client,client_addr=s.accept()
    s1=sc()
    s1.start()
    s1.join()
client.close()
s.close()

clientm.py

import socket

c=socket.socket()

c.connect(("localhost",9998))

ch=raw_input("Enter choice: 1 Write  2 Read\n")

c.send(ch)

if ch=='1':

    print "Writing to the file...\n"

    msg=raw_input("-->")

    c.send(msg)

else:

    print("file contents are...\n")

    msg=c.recv(4096)

    client_file=open('temp_copy.txt','w+')

    client_file.write(msg+'\n')

    client_file.close()

    print(msg)

c.close()

    

Write an IPC program using pipe. Process A accepts a character string and Process B inverses the string. Pipe is used to establish communication between A and B processes using Python or C++.

Problem Statement:

Write an IPC program using pipe. Process A accepts a character string and Process B inverses the string. Pipe is used to establish communication between A and B processes using Python or C++.

PROGRAM

Unnamed Pipe

#!/usr/bin/python
import os,sys

class npipe:
        def unnamed(self):
                fdr,fdw=os.pipe()
                procid=os.fork()
                if procid:
                    os.close(fdw)
                    fdr=os.fdopen(fdr)
                    str=fdr.read()
                    str=str[::-1]
                    print "reversed string: ",str
                    sys.exit(0)
                else:
                    os.close(fdr) 
                    str1=raw_input("Enter string: ")
                    fdw=os.fdopen(fdw,'w')
                    fdw.write(str1)
                    fdw.close()
                    sys.exit(0)

ob=npipe()
ob.unnamed()

Named Pipe

n_1.py

#!/usr/bin/python
import os
import sys

class a5_1:
        fd=0
        pipename="pipe3"

        def create_pipe(self):
                os.mkfifo(self.pipename)

        def write_pipe(self):
                self.fd=open(self.pipename,'w')
                self.fd.write("1")
                self.fd.close()
                str=raw_input("Enter string: ")
                self.fd=open(self.pipename,'w')
                self.fd.write(str)
                self.fd.close()

obj1=a5_1()
obj1.create_pipe()

while True:
    print "1.Enter string  2.Exit"
    choice=raw_input("Enter choice: ")
    if choice=='1':
        obj1.write_pipe()
    else:
        obj1.fd=open(obj1.pipename,'w')
        obj1.fd.write("2")
        obj1.fd.close()
        os.unlink(obj1.pipename)

        break;

n_2.py

#!/usr/bin/python

import os

import sys

class a5_2:

        fd=0

        pipename="pipe3"

        def read_pipe(self):

                self.fd=open(self.pipename,'r')

                stri=self.fd.read()

                revstr=stri[::-1]

                print "reveresed string: ",revstr

                self.fd.close()

obj2=a5_2()

while True:

    obj2.fd=open(obj2.pipename,'r')

    choice=obj2.fd.read()

    if choice=='1':

        obj2.read_pipe()

    else:

        break

Write a program in Python/C++ to read display the i-node information for a given text file, image file.

Problem Statement:
Write a program in Python/C++ to read display the i-node information for a given text file, image file.

PROGRAM

#include <iostream>

#include <sys/stat.h>

using namespace std;

class inode

{

    struct stat s;

    char str[1000];

public:

    void accept()

    {

     cout<<"Enter the path of the file:\t";

     cin>>str;

    }

    void information()

    {

    int d=stat(str,&s);

    }

    void disp()

    {

     cout<<"\nThe inode details of the file:\n";

     cout<<"\n\t 1)Device ID: "<<s.st_dev;

     cout<<"\n\t 2)File Serial No: "<<s.st_ino;

     cout<<"\n\t 3)Mode : "<<s.st_mode;

     cout<<"\n\t 4)No of Hard Links: "<<s.st_nlink;

     cout<<"\n\t 5)User ID: "<<s.st_uid;

     cout<<"\n\t 6)Group ID: "<<s.st_gid;

     cout<<"\n\t 7)Size: "<<s.st_size;

     cout<<"\n\t 8)Time of last access: "<<s.st_atime;

     cout<<"\n\t 9)Time of last data modification: "<<s.st_mtime;

     cout<<"\n\t 10)Time of last status change: "<<s.st_ctime;

     cout<<"\n\t 11)I/O block size: "<<s.st_blksize;

     cout<<"\n\t 12)No of blocks allocated: "<<s.st_blocks<<endl;

    }

};

int main()

{

    inode node;

    node.accept();

    node.information();

    node.disp();

    return 0;

}

OUTPUT

[dbsl@localhost ~]$ g++ A4_inode.cpp

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

     Enter path: /home/dbsl/A4_inode.cpp

     Filename : /home/dbsl/A4_inode.cpp

     Device id : 2058

     Inode number : 526528

     Device id (if the file is character or block special) : 0

     File size :2132

     Block size : 4096

     Number of blocks allocated for this file : 8

     Last access time : 1406093149 s

     Modified time : 1405655410 s

     Number of hard links : 1

     User name : dbsl

     User id : 1000

     Group name : dbsl

     Group id : 1000

     Mode : -rw-r--r--