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Network Programming Introduction to Inter process Communication : Pipes Introduction: There are two types of pipes for two-way communication: anonymous pipes and named pipes. Anonymous pipes enable related processes to transfer information to each other. Typically, an anonymous pipe is used for redirecting the standard input or output of a child process so that it can exchange data with its parent process. To exchange data in both directions (duplex operation), you must create two anonymous pipes. The parent process writes data to one pipe using its write handle, while the child process reads the data from that pipe using its read handle. Similarly, the child process writes data to the other pipe and the parent process reads from it. Anonymous pipes cannot be used over a network, nor can they be used between unrelated processes. Properties of Pipe: 1) Pipes do not have a name. For this reason, the processes must share a parent process. This is the main drawback to pipes. However, pipes are treated as file descriptors, so the pipes remain open even after fork and exec. 2) Pipes do not distinguish between messages; they just read a fixed number of bytes. Newline (\n) can be used to separate messages. A structure with a length field can be used for message containing binary data. 3) Pipes can also be used to get the output of a command or to provide input to a command. Creation of Pipes Since A pipe provides a one-way flow of data. Int pipe (int * filedes); Int pipefd[2]; /* pipefd[0] is opened for reading;pipefd[1] is opened for writing */ NP Lab Manual , RNEC P a g e | 2 For more Details access portals : ravinuthalavs.webs.com Ravinuthalavs.blogspot.com
o after call to fork o after both calls to dup2 NP Lab Manual , RNEC P a g e | 3 For more Details access portals : ravinuthalavs.webs.com Ravinuthalavs.blogspot.com I I
Page 1: IV YEAR B.Tech Network Programming
Page 5 and 6: WEEK 1: Aim: Implement the pipe usi
Page 7 and 8: Subject: NETWORK PROGRAMMING LAB Ye
Page 9 and 10: Output: [student@localhost ~]$ vi p
Page 11 and 12: Output: [student@localhost ~/khan]$
Page 13 and 14: } fclose(f); //closing file //creat
Page 17 and 18: Output: [student@localhost ~]$ cc m
Page 19 and 20: main() { int shmid; int semid; key_
Page 21 and 22: } for (i = 0; i < CHILD_INCREMENT_C
Page 23 and 24: if (*parent_shm == (CHILD_INCREMENT
Page 27 and 28: Output: [student@localhost ~]$ cc t
Page 29 and 30: Output: [student@localhost ~]$ ./ t
Page 31 and 32: } bzero(&servaddr, sizeof(servaddr)
Page 41 and 42: servAddr.sin_addr.s_addr = htonl(IN
Page 43 and 44: Output: [student@localhost ~]$ cc u
Page 45 and 46: *error = 0; return FD_ISSET(sd,&soc
Page 47 and 48: if(n
Page 51 and 52: printf("%s: from %s:UDP%u : %s \n"
Page 53 and 54:
Subject: NETWORK PROGRAMMING LAB Ye
Page 55 and 56:
cliAddr.sin_family = AF_INET; cliAd
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Output: [student@localhost ~]$ cc u
Page 59 and 60:
if(rc
Page 61 and 62:
Output: [student@localhost ~]$ cc u
Page 63 and 64:
if (select(sd+1,&socketReadSet,0,0,
Page 65 and 66:
} (struct sockaddr *) &echoServAddr
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