From: barmar@alum.mit.edu   
      
   In article ,   
    Rick Jones  wrote:   
      
   > David Schwartz  wrote:   
   > > On Oct 5, 2:21?am, GSA  wrote:   
   >   
   > > > I have a requirement wherein I need to check if data is there on   
   > > > the channel and read it when it is there.   
   >   
   > > > Please let me know if it is possible to check if data is there on   
   > > > the channewl and preoceed with reading the channel only when data   
   > > > is there.   
   >   
   > > Simply attempt to read from the channel using a non-blocking read. If   
   > > you get data, then there was data on the channel. There is no good way   
   > > to know that there is data on the channel without attempting to read   
   > > from the channel.   
   >   
   > 99 times out of 10 I have found select() or poll() "good enough."   
      
   You could also use the FIONREAD ioctl, which returns how much data is   
   buffered.  If it's non-zero, data is there.   
      
   --   
   Barry Margolin, barmar@alum.mit.edu   
   Arlington, MA   
   *** PLEASE don't copy me on replies, I'll read them in the group ***   
      
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