Please see similar source code from the deprecated HAL.:
hal/hald/linux/addons/addon-storage.c:
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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