how to clear system space buffers associated with read() call ?

avee137 · 09-23-2011, 08:44 AM

I have a code that reads a file descriptor in an infinite loop.
like :

Code:

{
   int fd ;
   char buf10[10] = {'\0'} ;
   fd = open ("/dev/somePort",O_RDWR);
   while(1){
       read(fd ,buf10,5 );
       //do some operation on buf10


       //here i want to clear the system space buffer/cache associated   
       //with read()     
       } 
}

Is there any system call available in linux which could do that?

Any relevant help would be greatly appreciated.

ta0kira · 09-23-2011, 10:37 AM

The only thing I can think of is to set the pipe to non-blocking mode and keep reading until you get EAGAIN or EWOULDBLOCK, then set it to blocking mode again for the next iteration.
Kevin Barry