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Add API to determine next timeout

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This commit is contained in:
Daniel Drake 2008-03-01 12:16:31 +00:00
parent 3ea28e334d
commit b167dd02fc
2 changed files with 28 additions and 0 deletions
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1
libfprint/fprint.h
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@ -276,6 +276,7 @@ struct fp_pollfd {
int fp_handle_events_timeout(struct timeval *timeout);
int fp_handle_events(void);
size_t fp_get_pollfds(struct fp_pollfd **pollfds);
int fp_get_next_timeout(struct timeval *tv);
typedef void (*fp_pollfd_added_cb)(int fd, short events);
typedef void (*fp_pollfd_removed_cb)(int fd);

27
libfprint/poll.c
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@ -243,6 +243,33 @@ API_EXPORTED int fp_handle_events(void)
return fp_handle_events_timeout(&tv);
}
/* FIXME: docs
* returns 0 if no timeouts active
* returns 1 if timeout returned
* zero timeout means events are to be handled immediately */
API_EXPORTED int fp_get_next_timeout(struct timeval *tv)
{
struct timeval fprint_timeout;
struct timeval libusb_timeout;
int r_fprint;
int r_libusb;
r_fprint = get_next_timeout_expiry(&fprint_timeout, NULL);
r_libusb = libusb_get_next_timeout(&libusb_timeout);
/* if we have no pending timeouts and the same is true for libusb,
* indicate that we have no pending timouts */
if (r_fprint == 0 && r_libusb == 0)
return 0;
/* otherwise return the smaller of the 2 timeouts */
else if (timercmp(&fprint_timeout, &libusb_timeout, <))
*tv = fprint_timeout;
else
*tv = libusb_timeout;
return 1;
}
/** \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