What are UNIX domain protocols?

The Unix domain protocols are not an actual protocol suite, but a way of performing client/server communication on a single host using the same API that is used for clients and servers on different hosts.

Why do we need credentials in UNIX domain protocol?

Unix domain sockets are used when passing descriptors between processes on the same host. We will provide a complete example of this in Section 15.7. Newer implementations of Unix domain sockets provide the client’s credentials (user ID and group IDs) to the server, which can provide additional security checking.

What is UNIX domain stream socket?

A Unix domain socket aka UDS or IPC socket (inter-process communication socket) is a data communications endpoint for exchanging data between processes executing on the same host operating system. It is also referred to by its address family AF_UNIX .

How are Unix domain sockets implemented?

Method of creating and opening. Sockets are created using socket and assigned their identity via bind . Named pipes are created using mkfifo . To connect to a UNIX domain socket the normal socket / connect calls are used, but a named pipe is written using regular file open and write .

Is Unix domain socket TCP?

Stream sockets, which use TCP as their underlying transport protocol. Datagram sockets, which use UDP as their underlying transport protocol. Unix Domain Sockets, which use local files to send and receive data instead of network interfaces and IP packets.

How fast are UNIX domain sockets?

The Unix socket implementation can send and receive more than twice the number of messages, over the course of a second, when compared to the IP one. During multiple runs, this proportion is consistent, varying around 10% for more or less on both of them.

Are UNIX domain sockets reliable?

Valid socket types in the UNIX domain are: SOCK_STREAM, for a stream-oriented socket; SOCK_DGRAM, for a datagram-oriented socket that preserves message boundaries (as on most UNIX implementations, UNIX domain datagram sockets are always reliable and don’t reorder datagrams); and (since Linux 2.6.

What is the difference between AF_UNIX and Af_inet?

The difference is that an INET socket is bound to an IP address-port tuple, while a UNIX socket is “bound” to a special file on your filesystem. Generally, only processes running on the same machine can communicate through the latter.

Do UNIX domain sockets use ports?

When the host is “localhost”, MySQL Unix clients use a Unix socket, AKA Unix Domain Socket, rather than a TCP/IP socket for the connection, thus the TCP port doesn’t matter.

What is the use of Unix Socket?

A Unix Socket is used in a client-server application framework. A server is a process that performs some functions on request from a client. Most of the application-level protocols like FTP, SMTP, and POP3 make use of sockets to establish connection between client and server and then for exchanging data.

Do UNIX sockets use TCP?

Bookmark this question. Show activity on this post. When the host is “localhost”, MySQL Unix clients use a Unix socket, AKA Unix Domain Socket, rather than a TCP/IP socket for the connection, thus the TCP port doesn’t matter.

Are UNIX sockets faster than TCP?

Unix domain sockets are often twice as fast as a TCP socket when both peers are on the same host. The Unix domain protocols are not an actual protocol suite, but a way of performing client/server communication on a single host using the same API that is used for clients and servers on different hosts.