Select() failing with EAGAIN?

Adam Jackson ajax at nwnk.net
Wed Aug 4 07:38:30 PDT 2010


On Tue, 2010-08-03 at 17:28 -0300, Fernando Carrijo wrote:
> The Open Group documentation for Select does not mention it failing with EAGAIN.
> 
>   http://opengroup.org/onlinepubs/007908775/xsh/select.html
> 
> Even so, we check for this error after Select is called in WaitForSomething.
> 
> Anybody knows why?

commit 85dd8efac1bc0715f03c99d261b1c5d0980623e1
Author: Daniel Stone <daniel at fooishbar.org>
Date:   Wed Dec 5 19:36:59 2007 +0000

    WaitForSomething: Ignore EAGAIN
    
    If select ever returns EAGAIN, don't bother complaining.

It does look like this has been seen in the wild for Linux systems at
least, where EAGAIN is 11:

http://www.google.com/search?q=%22WaitForSomething():+select:+errno%3D11%22

- ajax
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