linux-kernel - Re: uClibc

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Date:	Thu, 18 Jan 2007 21:36:53 +0000
From:	James Chapman <jchapman@...alix.com>
To:	Sue Alfano <smalfano@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: uClibc - waitid()

You're asking the wrong list. Try the uClibc list at uclibc.org.

glibc and uClibc provide C APIs to kernel system calls. uClibc doesn't 
implement all features that glibc supports - there are several kernel 
APIs that uClibc doesn't expose. Ask the uClibc folk for advice.

-- 
James Chapman
Katalix Systems Ltd
http://www.katalix.com
Catalysts for your Embedded Linux software development

Sue Alfano wrote:

> Can anyone help with this?
> 
> We have an application that runs fine on our linux workstations, but
> will not compile to run on a new target.  This application is using
> the WNOWAIT option for the waitid() function.  When the source file is
> compiled for the target using powerpc-uclibc-gcc, it fails because
> WNOWAIT is not defined.  The best that I can tell, waitid() doesn't
> appear to be supported in uClibc (version 0.9.27).  I checked the
> latest version on the uClibc site, but it doesn't appear to have been
> considered for inclusion.  I looked in glibc (versions 2.4, 2.3.5, and
> 2.0.6), but could only find emulated/stub/pseudo implementations for
> waitid().  The Linux man page for waitid() states that it's supported
> since the 2.6.9 kernel release.  At this point I'm not sure where the
> waitid() source code and WNOWAIT definition is suppose to be (kernel,
> uClibc, glibc, gcc) or what version of wait.h is actually being used
> (there appears to be many versions floating around on the machine).
> Since I'm way off in the weeds on this I was hoping somebody with more
> Linux experience than me (that would be just about anyone) might be
> able to shed some light on this problem or point me in a more
> constructive direction.
> 
> Do you have any information as to the status of the waitid() support?
> It must have been available at one time since it's running on my linux
> workstation (Linux version 2.6.15-1.2054_FC5smp
> (bhcompile@...0-bc1-3.build.redhat.com) (gcc version 4.1.0 20060304
> (Red Hat 4.1.0-3)) #1 SMP Tue Mar 14 16:05:46 EST2006).
> 
> Was there a reason why it wasn't added to uClibc (other than the size 
> issue)?
> 
> Is there a recommended way to deal with applications that are using
> waitid() with the WNOWAIT option?
> 
> Thanks for any assistance,
> Sue
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