Path: utzoo!attcan!uunet!ginosko!brutus.cs.uiuc.edu!usc!bloom-beacon!morgan.COM!jordan
From: jordan@morgan.COM (Jordan Hayes)
Newsgroups: comp.windows.x
Subject: X Toolkit Error: Select failed (Motif)
Message-ID: <8909132333.AA25879@Morgan.COM>
Date: 13 Sep 89 23:33:30 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 24

I have a simple application that does

	XtAppAddInput(app, fd, XtInputReadMask, callback, NULL);

with a file descriptor and adds whatever comes across that descriptor
to an XmScrolledList ... if I let it run for a while, invariably it
will exit with

	X Toolkit Error: Select failed

This application has been running for months under SunView using the
equivalent "watch this descriptor, call me when there's something to
do" without incident.  This is on a Sun 4, 4.0.3, etc.

Looking at Xt/NextEvent.c, this happens when select() returns -1 and
it's not because of EINTR ... hmmm, there's not that many things that
can make this happen ...

I tried to use trace to see what errno is when select returns -1, but
it must be a heisenbug, because it ran overnight with no problem.

Has anyone ever seen this happen before?

/jordan