io_uring: add support for recvmsg()

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This is done through IORING_OP_RECVMSG. This opcode uses the same
sqe->msg_flags that IORING_OP_SENDMSG added, and we pass in the
msghdr struct in the sqe->addr field as well.

We use MSG_DONTWAIT to force an inline fast path if recvmsg() doesn't
block, and punt to async execution if it would have.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Jens Axboe 2019-04-19 13:38:09 -06:00

parent 0fa03c624d

commit aa1fa28fc7

4 changed files with 39 additions and 4 deletions

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include/uapi/linux/io_uring.h

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