Mail Archives: cygwin/2022/07/05/10:14:36

"Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\] via Cygwin" <cygwin AT cygwin DOT com> · Tue, 5 Jul 2022 14:13:52 +0000

Hi,

There's some inconsistency between <sys/select.h> and <sys/param.h>:

sys/select.h has this:
-----------------------
/*
 * Select uses bit masks of file descriptors in longs.
 * These macros manipulate such bit fields (the filesystem macros use chars).
 * FD_SETSIZE may be defined by the user, but the default here
 * should be >= NOFILE (param.h).
 */
#ifndef FD_SETSIZE
#define FD_SETSIZE      64
#endif
----------------------

Now, this is the relevant part of sys/param.h looks like this:
----------------------
/* Max number of open files.  The Posix version is OPEN_MAX.  */
/* Number of fds is virtually unlimited in cygwin, but we must provide
   some reasonable value for Posix conformance */
#define NOFILE          8192
----------------------

So it's either "<= NOFILE" that was actually meant to be there in the comment (or,
an equivalent "should NOT be > NOFILE"), or FD_SETSIZE should have been defined as 8192,
if the comment is actually correct.  Or maybe I'm missing something here :-)

I understand that if I redefined FD_SETSIZE in my code before including <sys/select.h>,
it'd work with whatever large (or small) fd_set I need, but that's not what I'm after.

Anton Lavrentiev
Contractor NIH/NLM/NCBI

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To:	"'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject:	Typo in <sys/select.h>?
Thread-Topic:	Typo in <sys/select.h>?
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Date:	Tue, 5 Jul 2022 14:13:52 +0000
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From:	"Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\] via Cygwin" <cygwin AT cygwin DOT com>
Reply-To:	"Lavrentiev, Anton \(NIH/NLM/NCBI\) \[C\]" <lavr AT ncbi DOT nlm DOT nih DOT gov>
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