c++ - check whether fgets would block -

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i wondering whether in c possible peek in input buffer or perform similar trickery know whether call fgets block @ later time. java allows calling bufferedreader.ready(), way can implement console input this:

while (on && in.ready()) {    line = in.readline();   /* line */   if (!in.ready())     thread.sleep(100); }

this allows external thread gracefully shutdown input loop setting on false; i'd perform similar implementation in c without resorting non portable tricks, know can make "timed out fgets" under unix resorting signals or (better, though requering take care of buffering) reimplement on top of recv/select, i'd prefer work on windows too.

tia

suggest go socket i/o routines,preferably poll() required millisecond timeout , can interpret timeout ( return value = -1 ) unavailability of data in input buffer.
in opinion,there no non-blocking standard i/o function achieve functionality.


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