[asterisk-dev] About implementation of poll() in poll.c

[SteveK]

On Jul 21, 2006, at 10:40 AM, Pranav Peshwe wrote:

> Hello,
>          In chan_sip.c , ast_io_wait() uses the poll() function
> defined in poll.c. poll() internally uses select() for fd  
> multiplexing.
> Why is poll() implemented using select() in asterisk inspite of  
> being present as a
> standard function already i.e POLL(2)  - on linux atleast ? The  
> semantics of the
> implemented poll() function look similar to POLL(2).
> Is there any specific reason ? like portability problems for poll 
> () ? or is the
> implementation in any way different in functionality from POLL(2) ?
>

It seems the emulation is only used when the underlying system  
doesn't support poll() itself.

-SteveK