diff options
Diffstat (limited to 'man7/pipe.7')
| -rw-r--r-- | man7/pipe.7 | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/man7/pipe.7 b/man7/pipe.7 index d5db27696..baf05bc4a 100644 --- a/man7/pipe.7 +++ b/man7/pipe.7 @@ -2,7 +2,7 @@ .\" .\" SPDX-License-Identifier: Linux-man-pages-copyleft .\" -.TH pipe 7 2022-12-04 "Linux man-pages 6.03" +.TH pipe 7 2023-07-16 "Linux man-pages 6.05.01" .SH NAME pipe \- overview of pipes and FIFOs .SH DESCRIPTION @@ -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" : @@ -356,10 +363,9 @@ are performed only when increasing a pipe's capacity; an unprivileged user can always decrease a pipe's capacity. .IP (c) The accounting and checking against the limits were done as follows: -.IP .RS -.PD 0 .IP (1) 5 +.PD 0 Test whether the user has exceeded the limit. .IP (2) Make the new pipe buffer allocation. |