fts_read and fts_children do not return any file or directory

[fuck-shithub]

Hello, I am developing a server program for Alpine Linux, and I want to traverse file hierarchies, so I look up functions to do just that, and I find nftw which apparently sucks (stupid callback) so I saw the fts family of functions from BSD. Turns out musl does not support it but this package should, so I write a function using fts and it doesn't work at all and I don't know why.

Here is the relevant function I wrote. The output is just . Am I doing something wrong or is this fts implementation broken on Alpine Linux?
I rewrote it in nftw and that works, but I don't like nftw's design and that it requires global variables.

/*
 * Free after use with xmlFree
 */
xmlChar *
generate_tracks_xml_fts(void)
{
	xmlNodePtr root_node;
	xmlChar *xmlbuf;
	FTS *fts;
	FTSENT *parent;
	FTSENT *child;

	doc = xmlNewDoc(BAD_CAST "1.0");
	root_node = xmlNewNode(NULL, BAD_CAST "releases");
	xmlDocSetRootElement(doc, root_node);

	char *path_argv[] = { (char*) MUSIC_PATH, NULL };
	fts = fts_open(path_argv, FTS_NOCHDIR | FTS_XDEV, NULL);
	if (fts == NULL) {
		if (errno != ENOENT) {
			fprintf(stderr, "Failed to fts_open %s", MUSIC_PATH);
		}
		return 0;
	}

	while ((parent = fts_read(fts)) != NULL) {
		child = fts_children(fts, 0);

		if (errno != 0) {
			perror("fts_children");
		}

		while ((child != NULL)
			&& (child->fts_link != NULL)) {
			child = child->fts_link;
			switch (child->fts_info) {
				case FTS_F:
					xmlNewTextChild(root_node, NULL, BAD_CAST "track", BAD_CAST child->fts_name);
					puts(child->fts_name);
					break;
			}
		}
	}
	fts_close(fts);

	xmlDocDumpFormatMemory(doc, &xmlbuf, NULL, 1);
	return xmlbuf;
}

[wdlkmpx]

The way to know whether your code is broken is to link against glibc, if your code works with glibc then this implementation probably needs fixing