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    <p>I was wondering the same thing - <em>"What is the purpose of this lstat? Does it affect the glob()s return?"</em></p> <p>Within bsd_glob.c glob2() I noticed a g_stat call within an if branch that required the GLOB_MARK flag to be set, I also noticed a call to g_lstat just before that was not guarded by a flag check. Both are within an if branch for when the end of pattern is reached. If I remove these 2 lines in the glob2 function in perl-5.12.4/ext/File-Glob/bsd_glob.c</p> <pre><code>- if (g_lstat(pathbuf, &amp;sb, pglob)) - return(0); </code></pre> <p>the only perl test (make test) that fails is test 5 in ext/File-Glob/t/basic.t with:</p> <pre><code>not ok 5 # Failed test at ../ext/File-Glob/t/basic.t line 92. # Structures begin differing at: # $got-&gt;[0] = 'asdfasdf' # $expected-&gt;[0] = Does not exist </code></pre> <p>Test 5 in t/basic.t is</p> <pre><code># check nonexistent checks # should return an empty list # XXX since errfunc is NULL on win32, this test is not valid there @a = bsd_glob("asdfasdf", 0); SKIP: { skip $^O, 1 if $^O eq 'MSWin32' || $^O eq 'NetWare'; is_deeply(\@a, []); } </code></pre> <p>If I replace the 2 lines removed with:</p> <pre><code>+ if (!((pglob-&gt;gl_flags &amp; GLOB_NOCHECK) || + ((pglob-&gt;gl_flags &amp; GLOB_NOMAGIC) &amp;&amp; + !(pglob-&gt;gl_flags &amp; GLOB_MAGCHAR)))){ + if (g_lstat(pathbuf, &amp;sb, pglob)) + return(0); + } </code></pre> <p>I don't see any failures from "make test" for perl-5.12.4 on linux x86_64 (RHEL6.3 2.6.32-358.11.1.el6.x86_64) and when using:</p> <pre><code>strace -fe trace=lstat perl -e 'use File::Glob q{:glob}; print scalar bsd_glob(q{/var/log/*},GLOB_NOCHECK)' </code></pre> <p>I no longer see the lstat calls for each file in the dir. I don't mean to suggest that the perl tests for glob (File-Glob) are comprehensive (they are not), or that a change such as this will not break existing behaviour (this seems likely). As far as I can tell the code with this (g_l)stat call existed in original-bsd/lib/libc/gen/glob.c 24 years ago in 1990.</p> <p>Also see:</p> <ul> <li>Chapter 6. Benchmarking Perl of "Mastering Perl" By brian d foy, Randal L. Schwartz contains a section on comparing code where code using glob() and opendir() is compared.</li> <li>"future globs (was "UNIX mindset...")" in comp.unix.wizards from Dick Dunn in 1991.</li> <li>Usenet newsgroup mod.sources "'Globbing' library routine (glob)" from Guido van Rossum in July 1986 - I don't see a reference to "stat" in this code.</li> </ul>
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