Subtract a number of bytes from a bufferevent rate-limiting group'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 bufferevents in the group will resume or
suspend reading writing as appropriate.
@name Group rate limit manipulation
Subtract a number of bytes from a bufferevent rate-limiting group'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 bufferevents in the group will resume or suspend reading writing as appropriate.
Returns 0 on success, -1 on internal error.
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