Unix

Linux Socket Programming by Example by Warren Gay

By Warren Gay

Linux Socket Programming through instance starts off with a really easy advent to the basics of socket point programming. because the chapters development, you're brought to comparable thoughts, comparable to forming community addresses, Ipv6, the TCP/IP protocol suite and techniques, writing servers, and growing safe purposes. additionally, you will know about socket basics, domain names and addresses, handle conversion features, socket varieties and protocols, web sockets, forms and protocols, binding an tackle to a socket, utilizing Datagram orientated protocols, and lots more and plenty extra.

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Extra resources for Linux Socket Programming by Example

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582 unix 1 [ ] STREAM . . 574 unix 1 [ ] STREAM . . 572 unix 1 [ ] STREAM . . 408 $ Team-Fly® Path @00000019 @0000001f @00000020 @00000011 @00000030 @00000023 /dev/log /dev/log /dev/log /dev/log /dev/log Page 17 The executable program 01lst01 is invoked in line 1 in the output shown. Lines 2 and 3 show that the socket pair was opened on file descriptors 3 and 4. What follows in lines 4 to 20 are the output lines from the netstat(1) command that was invoked from the system(3) function call, within the program.

Understanding Sockets It is important that you have an understanding of some of the concepts behind the socket interface before you try to apply them. This section outlines some of the high level concepts surrounding the sockets themselves. Defining a Socket To communicate with someone using a telephone, you must pick up the handset, dial the other party's telephone number, and wait for them to answer. While you speak to that other party, there are two endpoints of communication established: •Your telephone, at your location •The remote party's telephone, at his location As long as both of you communicate, there are two endpoints involved, with a line of communication in between them.

The read(2) call in line 49 now attempts to read a message from the other socket s[0] . Any message up to the maximum size of array buf[] can be read in this statement. 7. Lines 50 to 55 check and report any error that might occur in the read statement. 8. Lines 60 to 62 report a successful reception of a message, and report what it was. Page 21 9. " to socket s[0] . This will demonstrate that information can travel both ways with sockets as endpoints, unlike a pipe. 10. Line 75 announces a successful write in line 67.

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