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Chapter 7. relay interface support
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Chapter 7. relay interface support

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relay interface

Relay interface supportis designed to provide an efficient mechanism for tools andfacilities to relay large amounts of data from kernel space touser space.

relay interface

relay_buf_full — boolean, is the channel buffer full?
relay_reset — reset the channel
relay_open — create a new relay channel
relay_late_setup_files — triggers file creation
relay_switch_subbuf — switch to a new sub-buffer
relay_subbufs_consumed — update the buffer's sub-buffers-consumed count
relay_close — close the channel
relay_flush — close the channel
relay_mmap_buf — mmap channel buffer to process address space
relay_alloc_buf — allocate a channel buffer
relay_create_buf — allocate and initialize a channel buffer
relay_destroy_channel — free the channel struct
relay_destroy_buf — destroy an rchan_buf struct and associated buffer
relay_remove_buf — remove a channel buffer
relay_buf_empty — boolean, is the channel buffer empty?
wakeup_readers — wake up readers waiting on a channel
__relay_reset — reset a channel buffer
relay_close_buf — close a channel buffer
relay_file_open — open file op for relay files
relay_file_mmap — mmap file op for relay files
relay_file_poll — poll file op for relay files
relay_file_release — release file op for relay files
relay_file_read_subbuf_avail — return bytes available in sub-buffer
relay_file_read_start_pos — find the first available byte to read
relay_file_read_end_pos — return the new read position
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