Creating a socket file

State diagram for server and client model. This is the same number which appears on protocol field in the IP header of a packet. This helps in manipulating options for the socket referred by the file descriptor sockfd. This is completely optional, but it helps in reuse of address and port. After creation of the socket, bind function binds the socket to the address and port number specified in addr custom data structure.

It puts the server socket in a passive mode, where it waits for the client to approach the server to make a connection. We need to call extra library for various purpose of configuration. Save the file in directory and compile it. After successful compilation, run the executable file from command terminal. You may refer to the tutorial How to make first C program in Linux if you are not aware of compilation and execution process. Here the system call socket creates the socket file descriptor upon successful execution.

Upon successful execution of socket , it will return file descriptor and the following line will be printed on the screen:. If not successfully created, it will return -1 and indicate the error occurred in creation of socket. Specific error type is returned by errno which is located in errno. Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search.

Elaborating on the 2nd bullet, I understand that. How can I 'communicate' with them? Let us say a sock file is designed to respond in a specific way For ex: it takes the input 'time' and prints out the current time. It'd also be better if someone can point me to some application like nc maybe? Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams?

Collectives on Stack Overflow. Learn more. What are. Asked 3 years, 3 months ago. A socket object is then used to call other functions to setup a socket server. Now call bind hostname, port function to specify a port for your service on the given host. Next, call the accept method of the returned object. This method waits until a client connects to the port you specified, and then returns a connection object that represents the connection to that client.

Let us write a very simple client program which opens a connection to a given port and given host. This is very simple to create a socket client using Python's socket module function. The socket. Once you have a socket open, you can read from it like any IO object. When done, remember to close it, as you would close a file.