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epoll_ctl.2: Give the reader a clue that the 'events' field can be zero 

'events' specified as zero still allows EPOLLHUP and
EPOLLERR to be reported.

Reported-by: Nicolas Biscos <nicolas.biscos+man7@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2017-03-31 07:01:57 +02:00
parent 25c2dd2f87
commit 967631f2c8
1 changed files with 3 additions and 2 deletions
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5
man2/epoll_ctl.2
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@ -95,8 +95,8 @@ struct epoll_event {
The The
.I events .I events
member is a bit mask composed using the following available event member is a bit mask composed by ORing together zero or more of
types: the following available event types:
.TP .TP
.B EPOLLIN .B EPOLLIN
The associated file is available for The associated file is available for
@ -134,6 +134,7 @@ Hang up happened on the associated file descriptor.
.BR epoll_wait (2) .BR epoll_wait (2)
will always wait for this event; it is not necessary to set it in will always wait for this event; it is not necessary to set it in
.IR events . .IR events .
Note that when reading from a channel such as a pipe or a stream socket, Note that when reading from a channel such as a pipe or a stream socket,
this event merely indicates that the peer closed its end of the channel. this event merely indicates that the peer closed its end of the channel.
Subsequent reads from the channel will return 0 (end of file) Subsequent reads from the channel will return 0 (end of file)