UDP recvfrom question

[zsfhaergta]

Hi,

I am developing the client end of a program. I receive data from at most two channels at a time. While I am currently recvfrom() and processing the data from one channel, I call recvfrom() and queue the data from the other channel. At times this runs correctly. Other times, it seems that recvfrom() doesn't see any data coming from the network. I have tried the block and non-blocking methods, but neither of them return with data. Besides waiting for data to appear on the network, is there any other reason why the recvfrom() function would block or return nothing(for nonblocking)?

Thanks,
Allen

 

[Amiel]

recvfrom() should return -1 when set to non-blocking when called and no data is available.

Otherwise it blocks until data is received. So there is your dilemma . You must write code to handle the limitations of the function library while dealing with the requirements of the network, it's applications and your application.

Incidentally, this is defiantly a software programming question. I don't think you'll get the best response here. Maybe try the C programming area or General UNIX discussion.

Amiel Summers