Subtract a number of bytes from a bufferevent's read or write bucket.
The decrement value can be negative, if you want to manually refill
the bucket. If the change puts the bucket above or below zero, the
bufferevent will resume or suspend reading writing as appropriate.
These functions make no change in the buckets for the bufferevent's
group, if any.
@name Rate limit manipulation
Subtract a number of bytes from a bufferevent's read or write bucket. The decrement value can be negative, if you want to manually refill the bucket. If the change puts the bucket above or below zero, the bufferevent will resume or suspend reading writing as appropriate. These functions make no change in the buckets for the bufferevent's group, if any.
Returns 0 on success, -1 on internal error.
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