Client To Server Model with System Calls in Unix

System calls never have been fun to work with. They are elaborately written, have multiple arguments and can even have variations within those method calls.

Client To Server Model with System Calls in Unix

It’s a problem because many programmers, even the high end developers are uncomfortable when it comes to writing code with system calls. I certainly do not blame them- have you ever looked at the struct that lets you write custom signal behavior? It takes another struct within it as one of its arguments so we really are not dealing with the easiest of constructs.

The Client to server model is one of the oldest models of codes that many communication softwares use as their skeleton. Why do you need to know how to make one on your own? Because these things are difficult and as it turns out, you will have a tough time working on an already build one if you do not know the basic flow of these things.

Now the above pasted code has been referenced from various tutorials but is largely of my client-server code. The excerpt is of the socket which is used to generate communication of data between alternate processes. This code does 4 basic things; it creates the socket and then names it. Once that is done it goes on to check for IPs to connect and then it accepts those connections via the accept API.

This sets up a connection between two different programs between the terminals in Linux’s interface. There are certain variations with each OS but that’s something which is verifiable.

Now with the connection established, you can do a number of useful operations within the server which you can then send back to the client.

This is another of the methods we wrote for writing out any printed line on the terminal. The sprint is used to convert any kind of a variable into a string stream as the Write API can only take strings as its arguments.

Once you have forked into another process, you can load a different process or program on it using the execlp command. Bear in mind that the exec commands have variations with different arguments as well. The execlp launches a different code once it works which is why you only include the error condition code beneath it.

Putting the pieces

The client to server model is practically implemented via the socket code. The other pieces that I have included help you write more process oriented procedures in your Unix applications. You can be doing high level development via newer coding streams but it always helps to be able to implement certain procedures via system calls as they add up a level of basicity in the processing stream.

Overall, Unix offers more control in terms of process handling but I advise care when using the exec and kill codes for getting rid of processes. Handle this properly and you can do literally anything via your client server platform.

Uzair Tajuddin

Uzair is a passionate blogger who loves to write on digital marketing and web development topics. For more updates visit http://www.psdcenter.com

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