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Provide access to fd set

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Includes notifications when the set changes.
This commit is contained in:
Daniel Drake
2008-02-26 22:40:38 +00:00
parent 88e9f4a5f8
commit 3ea28e334d
4 changed files with 86 additions and 6 deletions
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78
libfprint/poll.c
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@@ -61,18 +61,16 @@
* is expiring soonest at the head. */
static GSList *active_timers = NULL;
/* notifiers for added or removed poll fds */
static fp_pollfd_added_cb fd_added_cb = NULL;
static fp_pollfd_removed_cb fd_removed_cb = NULL;
struct fpi_timeout {
struct timeval expiry;
fpi_timeout_fn callback;
void *data;
};
void fpi_poll_exit(void)
{
g_slist_free(active_timers);
active_timers = NULL;
}
static int timeout_sort_fn(gconstpointer _a, gconstpointer _b)
{
struct fpi_timeout *a = (struct fpi_timeout *) _a;
@@ -245,3 +243,71 @@ API_EXPORTED int fp_handle_events(void)
return fp_handle_events_timeout(&tv);
}
/** \ingroup poll
* Retrieve a list of file descriptors that should be polled for events
* interesting to libfprint. This function is only for users who wish to
* combine libfprint's file descriptor set with other event sources - more
* simplistic users will be able to call fp_handle_events() or a variant
* directly.
*
* \param pollfds output location for a list of pollfds. If non-NULL, must be
* released with free() when done.
* \returns the number of pollfds in the resultant list, or negative on error.
*/
API_EXPORTED size_t fp_get_pollfds(struct fp_pollfd **pollfds)
{
struct libusb_pollfd *usbfds;
struct fp_pollfd *ret;
size_t cnt;
size_t i;
cnt = libusb_get_pollfds(&usbfds);
if (cnt <= 0) {
*pollfds = NULL;
return cnt;
}
ret = g_malloc(sizeof(struct libusb_pollfd) * cnt);
for (i = 0; i < cnt; i++) {
ret[i].fd = usbfds[i].fd;
ret[i].events = usbfds[i].events;
}
*pollfds = ret;
return cnt;
}
/* FIXME: docs */
API_EXPORTED void fp_set_pollfd_notifiers(fp_pollfd_added_cb added_cb,
fp_pollfd_removed_cb removed_cb)
{
fd_added_cb = added_cb;
fd_removed_cb = removed_cb;
}
static void add_pollfd(int fd, short events)
{
if (fd_added_cb)
fd_added_cb(fd, events);
}
static void remove_pollfd(int fd)
{
if (fd_removed_cb)
fd_removed_cb(fd);
}
void fpi_poll_init(void)
{
libusb_set_pollfd_notifiers(add_pollfd, remove_pollfd);
}
void fpi_poll_exit(void)
{
g_slist_free(active_timers);
active_timers = NULL;
fd_added_cb = NULL;
fd_removed_cb = NULL;
libusb_set_pollfd_notifiers(NULL, NULL);
}