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| -rw-r--r-- | man7/pipe.7 | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/man7/pipe.7 b/man7/pipe.7 index c3e06bdab..91554fa3c 100644 --- a/man7/pipe.7 +++ b/man7/pipe.7 @@ -56,12 +56,19 @@ If a process attempts to write to a full pipe (see below), then .BR write (2) blocks until sufficient data has been read from the pipe to allow the write to complete. +.PP Nonblocking I/O is possible by using the .BR fcntl (2) .B F_SETFL operation to enable the .B O_NONBLOCK -open file status flag. +open file status flag or by opening a +.BR fifo (7) +with +.BR O_NONBLOCK . +If any process has the pipe open for writing, reads fail with +.BR EAGAIN ; +otherwise\[em]with no potential writers\[em]reads succeed and return empty. .PP The communication channel provided by a pipe is a .IR "byte stream" : |