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Community/Discussion/General/Using a file descriptor from pipe with select/List of Posts
Forum Topic - Using a file descriptor from pipe with select: (5 Items)
   
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Steve Osselton(deleted)
02/24/2015 11:25 AM
post113364
Using a file descriptor from pipe with select   
I am porting some existing Linux code that wakes a thread blocked on select by adding the pipe
read file descriptor to the select fd set and writing to the write pipe fd (to break out of a read select). Looks like 
select isn't being triggered, are there any know issues with doing this on QNX (6.5)?

Cheers Steve.
Sean Boudreau(deleted)
02/24/2015 11:29 AM
post113365
Re: Using a file descriptor from pipe with select   
On Tue, Feb 24, 2015 at 11:25:43AM -0500, Steve Osselton wrote:
> I am porting some existing Linux code that wakes a thread blocked on select by adding the pipe
> read file descriptor to the select fd set and writing to the write pipe fd (to break out of a read select). Looks like
 select isn't being triggered, are there any know issues with doing this on QNX (6.5)?
> 

No known issues.  I know this has been done in the past.

Regards,

-seanb
Steve Osselton(deleted)
02/24/2015 12:09 PM
post113366
Re: Using a file descriptor from pipe with select   
Thanks, on closer analysis pipe was failing with perror "pipe: Function not implemented", which I
guess is because I'm running on a custom kernel with this support removed (is a 3rd party kernel).
Sean Boudreau(deleted)
02/24/2015 12:12 PM
post113367
Re: Using a file descriptor from pipe with select   
pipe support isn't in the kernel (microkernel), it's provided
by the pipe manager: the process called 'pipe'.

On Tue, Feb 24, 2015 at 12:09:01PM -0500, Steve Osselton wrote:
> Thanks, on closer analysis pipe was failing with perror "pipe: Function not implemented", which I
> guess is because I'm running on a custom kernel with this support removed (is a 3rd party kernel).
> 
> 
> 
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Steve Osselton(deleted)
02/24/2015 12:27 PM
post113368
Re: Using a file descriptor from pipe with select   
Ahh, thought this was only required for inter-process pipe support?

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