https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226166
Bug ID: 226166
Summary: [PATCH] fts(3): setting FTS_FOLLOW for children does
not work as expected when FTS_NOCHDIR is set
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Keywords: patch
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: jan.kokemuel...@gmail.com
Keywords: patch
Created attachment 190957
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=190957&action=edit
patch to fix FTS_FOLLOW when set on entries returned by fts_children()
Reading the fts(3) man page something like the example below should work. This
sets FTS_FOLLOW on a child named 'symlink' which is a symlink to another
folder. fts_read will now recurse into this folder, even though FTS_PHYSICAL is
set. Right now it won't recurse, however, when FTS_NOCHDIR is also set.
The problem is a stale fts_accpath. This leads to fts_stat() calling stat on
the wrong file. The attached patch attempts to fix this by switching the order
of the fts_stat() and the fts_accpath update.
#include <err.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int
main()
{
FTS *fts;
FTSENT *ftsent, *children;
char *fts_args[] = { ".", NULL };
fts = fts_open(fts_args, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
if (!fts) {
err(1, "fts");
}
while ((ftsent = fts_read(fts))) {
fprintf(stderr, "got file: %s\n", ftsent->fts_path);
children = fts_children(fts, 0);
for (FTSENT *child = children; child;
child = child->fts_link) {
if (!strcmp("symlink", child->fts_name)) {
if (fts_set(fts, child, FTS_FOLLOW)) {
err(1, "fts_set");
}
}
}
}
if (fts_close(fts) < 0) {
warn("fts_close");
}
}
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