support IORING_OP_TEE

[oech3]

Is your feature request related to a problem? Please describe.
I'm interested in usage of IORING_OP_TEE at yes for impremention with less tee syscalls. It seems there is no tee support at source code. I'm doing
pipe buffer ->(tee)-> stdout to avoid unsafe vmsplice without io_uring currently. I cannot use splice since pipe buffer is consumed.

Describe the solution you'd like
Add support for safe async IORING_OP_TEE usage.

Describe alternatives you've considered
unknown.

[oech3]

@kaspar030 Where is your yes's repository noted at #352 (comment) ?

[kaspar030]

@kaspar030 Where is your yes's repository noted at #352 (comment) ?

Not sure what you mean, I was using the yes command that comes shipped with Arch Linux, which is provided by the coreutils package.

[oech3]

Sorry. I misunderstand that you have yes with zero-copy support by monoio.