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When an eventfd overflows, select() indicates the file as both 

readable and writable (not as having an exceptional condition).
This commit is contained in:
Michael Kerrisk 2008-08-18 11:09:15 +00:00
parent aa966d080f
commit 20e5fb78ea
1 changed files with 6 additions and 7 deletions
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13
man2/eventfd.2
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@ -16,7 +16,7 @@
.\" Foundation, Inc., 59 Temple Place, Suite 330, Boston,
.\" MA 02111-1307 USA
.\"
.TH EVENTFD 2 2008-02-11 Linux "Linux Programmer's Manual"
.TH EVENTFD 2 2008-08-19 Linux "Linux Programmer's Manual"
.SH NAME
eventfd \- create a file descriptor for event notification
.SH SYNOPSIS
@ -126,15 +126,14 @@ argument; the
flag)
if it is possible to write a value of at least "1" without blocking.
.IP *
The file descriptor indicates an exceptional condition
(the
If an overflow of the counter value was detected,
then
.BR select (2)
.I exceptfds
argument; the
indicates the file descriptor as being both readable and writable, and
.BR poll (2)
returns a
.B POLLERR
flag)
if an overflow of the counter value was detected.
event.
As noted above,
.BR write (2)
can never overflow the counter.