Question

i got some legacy code using: nonblocking socket, select for timeout, read(2) and write(2).
Now it occasionally failed due to select/1024 fd limits. so i need to replace the select.

It seems RCVTIMEO and SNDTIMEO can also check timeout but they work for blocking mode, and it impacts too much to change from non-blocking to blocking.

So is there any other best practice to check timeout for nonblocking socket(no select)? Or i have to get some timer/nanosleep to solve this?

Answer 1

poll() is essentially a drop-in replacement for using select(), but does not have the 1024 file descriptor limit. You will have to change your code slightly to create an array of struct pollfd structures instead of using fd_sets, but the overall structure of the code should not have to change.