[udisks] CD-ROM polling failed due to O_EXCL flag (poller.c)

PCMan pcman.tw at gmail.com
Fri Feb 25 04:20:41 PST 2011

Please see similar source code from the deprecated HAL.:
While UDIsks add O_EXCL unconditionally, HAL tries O_EXCL first, and
if the device is busy, in some cases it does it without that flag.

static gboolean
poll_for_media_force (void)
        int fd;
        int got_media;
        int old_media_status;

	got_media = FALSE;

        old_media_status = media_status;
	if (is_cdrom) {
		int drive;
		fd = open (device_file, O_RDONLY | O_NONBLOCK | O_EXCL);
		if (fd < 0 && errno == EBUSY) {
			/* this means the disc is mounted or some other app,
			 * like a cd burner, has already opened O_EXCL */
			/* HOWEVER, when starting hald, a disc may be
			 * mounted; so check /etc/mtab to see if it
			 * actually is mounted. If it is we retry to open
			 * without O_EXCL
			if (!is_mounted (device_file)) {
                                if (!is_locked_via_o_excl) {
                                        is_locked_via_o_excl = TRUE;
                                        update_proc_title ();
                                } else {
                                        is_locked_via_o_excl = TRUE;
				goto skip_check;
			fd = open (device_file, O_RDONLY | O_NONBLOCK);

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