[asterisk-dev] Implementation using libpri and socketpair()

[Paul Cadach]

This is expected pipe behavior (to split/concatenate writes following its internal rules).

As a workaround, you can perform quick lookup through message to calculate its real size (especially if you have Q.921 headers).


WBR,
Paul.
  ----- Original Message ----- 
  From: Paulo Garcia 
  To: Asterisk Developers Mailing List 
  Sent: Wednesday, February 07, 2007 10:30 AM
  Subject: [asterisk-dev] Implementation using libpri and socketpair()


  Hi,

  in my own channel, I'm implementing ISDN support using Libpri. The implementation is completely independent from zaptel then I'm trying to do all communications between my hardware and libpri using socketpair function. 

  The idea is to create a socketpair, passing fd[0] to pri_new function and writing to fd[1] to pass data to libpri. So far so good...

  To receive data from libpri, I have a thread checking for all file descriptors fd[1] using select() function and when I receive something, I pass it to my card. This approach also works well but sometimes I receive two messages (from libpri) in only one read() call. I think this is because of libpri writes two messages so fast then when the read is called, there are already two messages in socket buffer... 

  How can I avoid this behavior? Maybe using another way different of socketpair ? This communication will be used only inside the same process, between different threads.

  Any path or idea will be appreciated. 


  Regards


  Paulo Garcia



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