DC_DEVICE_SET_CANCEL(3) Library Functions Manual DC_DEVICE_SET_CANCEL(3) NAME dc_device_set_cancel -- callback to check whether processing should cancel LIBRARY libdivecomputer SYNOPSIS #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); DESCRIPTION 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. RETURN VALUES Returns DC_STATUS_UNSUPPORTED if the device is NULL, or DC_STATUS_SUCCESS otherwise. SEE ALSO dc_device_open(3) AUTHORS The libdivecomputer library was written by Jef Driesen, jef@libdivecom- puter.org. These manpages were written by Kristaps Dzonsons, kristaps@bsd.lv. FreeBSD ports 15.quarterly January 5, 2017 DC_DEVICE_SET_CANCEL(3)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | AUTHORS
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