Subject: Re: Problem with select() function, works under normal Linux
From: Brian Dessent <[email-masked]>
To: [email-masked]
Date: Sun, 30 May 2004 22:28:19 -0700

[email-masked] wrote:

> Like the subject says, I'm having trouble with select() under Cygwin, when it works under RedHat 9 and Fedora Core 2 FINAL.  The output is shown below for both.  And a bit of code at the bottom.

In general you will find that just because something works on linux
doesn't mean it's correct or portable to other POSIX systems.

> int maxfd;
> ...
> maxfd = 300;
> ...
> if (select(maxfd + 1, &readSet, (fd_set *)0, (fd_set *)0, NULL) < 0)

What in the world is this 300?  Why not try passing FD_SETSIZE instead? 
In cygwin FD_SETSIZE is 64 by default unless you redefinite it before
including the headers.  You're telling select to examine 301 handles but
you're only passing a data structure that holds 64...

Brian

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