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-.\" SPDX-License-Identifier: Linux-man-pages-1-para
-.\"
-.\" This man page is Copyright (C) 1999 Claus Fischer.
-.\"
-.\" 990620 - page created - aeb@cwi.nl
-.\"
-.TH fifo 7 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-fifo \- first-in first-out special file, named pipe
-.SH DESCRIPTION
-A FIFO special file (a named pipe) is similar to a pipe,
-except that it is accessed as part of the filesystem.
-It can be opened by multiple processes for reading or
-writing.
-When processes are exchanging data via the FIFO,
-the kernel passes all data internally without writing it
-to the filesystem.
-Thus, the FIFO special file has no
-contents on the filesystem; the filesystem entry merely
-serves as a reference point so that processes can access
-the pipe using a name in the filesystem.
-.P
-The kernel maintains exactly one pipe object for each
-FIFO special file that is opened by at least one process.
-The FIFO must be opened on both ends (reading and writing)
-before data can be passed.
-Normally, opening the FIFO blocks
-until the other end is opened also.
-.P
-A process can open a FIFO in nonblocking mode.
-In this
-case, opening for read-only succeeds even if no one has
-opened on the write side yet and opening for write-only
-fails with
-.B ENXIO
-(no such device or address) unless the other
-end has already been opened.
-.P
-Under Linux, opening a FIFO for read and write will succeed
-both in blocking and nonblocking mode.
-POSIX leaves this
-behavior undefined.
-This can be used to open a FIFO for
-writing while there are no readers available.
-A process
-that uses both ends of the connection in order to communicate
-with itself should be very careful to avoid deadlocks.
-.SH NOTES
-For details of the semantics of I/O on FIFOs, see
-.BR pipe (7).
-.P
-When a process tries to write to a FIFO that is not opened
-for read on the other side, the process is sent a
-.B SIGPIPE
-signal.
-.P
-FIFO special files can be created by
-.BR mkfifo (3),
-and are indicated by
-.I ls\~\-l
-with the file type \[aq]p\[aq].
-.SH SEE ALSO
-.BR mkfifo (1),
-.BR open (2),
-.BR pipe (2),
-.BR sigaction (2),
-.BR signal (2),
-.BR socketpair (2),
-.BR mkfifo (3),
-.BR pipe (7)