channel

A pointer to a buffer to receive the NULL terminated channel name. To avoid possible truncation of the channel name, this buffer must be at least CHANLENGTH+1 bytes long.

channel_len

An optional pointer to a size_t to receive the length in bytes of the returned channel name. This length does not include the NULL terminator that terminates the channel name.

channel_len_max

The maximum size in bytes of the buffer pointed at by the channel argument.