lifetime of msghdr in sendmsg/sendmsg_zc

[pyhd]

As I read the code, each msghdr will be copied to io_async_msghdr after io_uring_submit except -ENOMEM. In other words, the userspace can reuse them immediately after a successful submission. Then I just wonder if there are any other exceptions.

[isilence]

It's not an exception, sendmsg[_zc] never accesses user's msghdr and iovec after the request has been submitted, i.e. io_uring_submit returns, regardless of the result.

[pyhd]

Thank you for your answer.