timer_delete - delete a POSIX per-process timer
timer_delete() deletes the timer whose ID is given
timerid. If the timer was armed at the time of this call, it
is disarmed before being deleted. The treatment of any pending signal
generated by the deleted timer is unspecified.
On success, timer_delete() returns 0. On failure, -1
is returned, and
errno is set to indicate the error.
timerid is not a valid timer ID.
This system call is available since Linux 2.6.
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