using fgets as non-blocking function c++

Question

I\'m writing a program that reads in a loop from the stdin, using the function fgets, as follows:

while(fgets(buffer2, BUFFERSIZE , stdin) != NULL){
  //So         


        

Answer 1

If you have a proper POSIX environment, you can use select() or poll() to check for input on stdin's descriptor before calling fgets()... read().

Jan's comment below (thanks!) explains why you can't use fgets() with this approach... summarily, there's an extra layer of buffering in the FILE object, and data can already be waiting in though the select() finds nothing more on the file descriptor... preventing your program from responding in a timely way, and potentially hanging if some other system is waiting for a response to already sent data before sending more on stdin.