First-in, First-Out File System (FIFOFS)

The FIFOFS feature provides support for named pipes. It requires either NFS_CLIENT or UFS to be configured as well as POSIX_SOCKETS and AF_LOCAL.

For details, see the FIFOFS(5FEA) man page.

FIFOFS API

The FIFOFS feature does not have its own API, but enables nodes created using mkfifo() to be used as pipes.