This is very bizarre and I don't know if anyone can actually test this. I have a very simple script as follows: 
#!/usr/bin/perl -w

my $foo="/tmp/*";
my @glob=glob($foo);
my $size=scalar(@glob);

print "Content-type: text/html\n\n";
print "<html><head>\n";
print "SIZE: $size\n";
print"</head></html>\n";

[download]
and as expected, when I run it on a webserver it reports the number of files in /tmp.

But when I run in on RHEL6.2 in a VirtualBox VM it reports 0. Furthermore, when I point it to a different directory, in my case /usr/share/collectl/plotfiles, it works correctly. Since /tmp has the sticky bit set I even created /tmp2 and tried it against that directory. Still reported 0.

I had convinced myself it was a problem in RHEL6.2 but then I remembered I has another system running VMware/RHEL6.2 and I tried it there and it works fine! This makes me wonder if there's something funky about a vm in the virtualbox environment and/or a possible problem with glob itself in such an environment.

I did try running readdir instead of glob and it worked just fine, but I'd really like to get to the bottom of this if th is really is a bug.

Can anyone suggest any other experiments I might be able to try to add more context to this?

-mark

In reply to Might there be some bug in glob under apache? by markseger

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