git: kernel - Implement POLLHUP for pipes and filesystem fifos (4)
dillon at crater.dragonflybsd.org
Thu May 13 11:08:11 PDT 2021
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date: Thu May 13 11:03:39 2021 -0700
kernel - Implement POLLHUP for pipes and filesystem fifos (4)
* pipes need the same shutdown-vs-closed treatment. Only trigger
POLLHUP when the other end is closed. Do not trigger POLLHUP
when the other end issues a shutdown(..SHUT_WR).
* NOTE: Linux does not support shutdown() on pipes because linux
pipes are half-duplex. BSD pipes are full-duplex and shutdown()
makes more sense. That said, make shutdown()'s POLLHUP behavior
uniform across the board... meaningthat shutdown() does NOT trigger
POLLHUP, only a complete close().
This is important because I suspect linux programmers might use
POLLHUP to try to detect unexpected terminations, whereas a
shutdown() is par for the course when communications are being
shut-down in an expected manner.
Summary of changes:
sys/kern/sys_pipe.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
DragonFly BSD source repository
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