dc_device_set_cancel —
callback to check whether processing should
cancel
library “libdivecomputer”
#include
<libdivecomputer/device.h>
typedef int
(*dc_cancel_callback_t)(
void
*userdata);
dc_status_t
dc_device_set_cancel(
dc_device_t
*device,
dc_cancel_callback_t callback,
void *userdata);
Provide a function that the underlying
device
will periodically call to see if it should cancel its processing. The
callback will return zero if the operation
should not be cancelled, one if it should be cancelled.
The callback usually checks a value that is set during a signal handling
callback. For example, one can invoke
signal(3) to a function that
sets a
volatile sig_atomic_t value checked by
the
callback handler.
Returns
DC_STATUS_UNSUPPORTED if the
device is
NULL, or
DC_STATUS_SUCCESS otherwise.
dc_device_open(3)
The
library “libdivecomputer”
library was written by
Jef Driesen,
jef@libdivecomputer.org.
These manpages were written by
Kristaps Dzonsons,
kristaps@bsd.lv.