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6.4

stdin polling on Windows

Asked by crazycomputers in C Programming Language

Tags: stdin, windows

I have been trying, without success, to find some function on Windows that will simply tell me if a call to getc(stdin) will not block (i.e. there is one or more characters waiting on stdin.) This is very simple on *nix systems. Also, the polling solution should be able to work regardless of whether the program is running in a Win32 console or was started by another process that uses stdio to communicate to it.

The main loop of my program is best represented by this pseudo-code:

for (;;) {
while (stdin_ready()) {
read_one_char_from_stdin();
do_something_with_char();
}

while (socket_ready())
handle_socket();
}

On both platforms, the socket_ready() code uses select() to poll the socket. On *nix, stdin_ready() also uses select(), but I cannot do this on Windows, as select() is provided by the Winsock library, so it only works on sockets.

A solution may use isatty() if it is 100% necessary to split code based upon whether the program is being run in a console. However, I will prefer solutions that "do not care" about where the program is run. Basically, I'm looking for a solution that uses stdio in the purest form.

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20091021-EE-VQP-81

stdin polling on Windows

Asked by crazycomputers in C Programming Language

Tags: stdin, windows

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