read() is blocking

[Guest_imported]

Hi,

I read successfully the serial port buffer until there are no characters left. At this point, the function read() is waiting for another charater. The problem is that there won't be any.
Do you know how to detect this infinite state of waiting?
(I use Linux).

thank you!

thomas

 

[byk]

While opening the device file you can set the NO DELAY property.
like -


#include<fctnl.h>
~~~
~~~
file_ptr = open( &quot;/dev/modem_file&quot;, (O_RDWR|O_NDELAY));
OR
file_ptr = open( &quot;/dev/modem_file&quot;, (O_RDWR|O_NONBLOCK));

This will make the read to return if there is no data

CHeers
byk