A couple weeks ago, `david_chrisnall` on lobste.rs talked about pipe content negotiation [0]. Here is the relevant paragraph: """ Pipe content negotiation is

A couple weeks ago, `david_chrisnall` on lobste.rs talked about pipe content negotiation [0]. Here is the relevant paragraph: """ Pipe content negotiation is a simple protocol modeled on the OpenStep drag-and-drop protocol, implemented as three ioctls. The sender issues a blocking ioctl to advertise a set of things that it can produce, the [receiver] issues a blocking ioctl to receive this list and a second (non-blocking) one to select the one that it wants to use. If the sender does a write before content negotiation, the receiver’s ioctl unblocks and returns an error, similarly if the receiver does a read before completing content negotiation the sender unblocks and returns an error. This lets you establish a pipe between two processes that can negotiate a content type but also fall back to whatever your default was if neither end supported it. """ [0] https://lobste.rs/s/mtatsi/unix_shell_programming_next_50_years#c_p4ojir https://lobste.rs/s/mtatsi/unix_shell_programming_next_50_ye...