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Postings from April 2000
Hugo <hv@crypt.compulink.co.uk> wrote
> The documentation refers to $nfound, but doesn't at any point explain
> what it is. I don't understand it well enough myself to offer a patch -
> is it the number of different file handles, of those on which you are
> selecting, for which one of readable/writable/error is true?
On Solaris 2.6, "man -s 3c select" tells me
On successful completion, select() returns the total number
of bits set in the bit masks. Otherwise, -1 is returned,
and errno is set to indicate the error.
So I guess the attached patch is OK on at least one platform.
Mike Guy
--- ./pod/perlfunc.pod.orig Mon Mar 20 22:13:52 2000
+++ ./pod/perlfunc.pod Wed Apr 26 16:24:55 2000
@@ -3900,8 +3900,11 @@
$nfound = select($rout=$rin, $wout=$win, $eout=$ein, undef);
-Most systems do not bother to return anything useful in $timeleft, so
-calling select() in scalar context just returns $nfound.
+$nfound will be set to the total number of bits set in the $rout,
+$wout and $eout bitmaps. $nfound is zero if the select timed out.
+If $nfound is negative, the select terminated abnormally and the error
+is in $!. Most systems do not bother to return anything useful in
+$timeleft, so calling select() in scalar context just returns $nfound.
Any of the bit masks can also be undef. The timeout, if specified, is
in seconds, which may be fractional. Note: not all implementations are
End of patch