[gnutls-devel] GnuTLS | support async operation e.g. io_uring (#1510)

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Yick created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1510



By io_uring, a batch of recv/send could be submitted in a single syscall; frankly it looks like sendmmsg/recvmmsg, though it is more powerful, because it can combine recv/send operations with dozens of sockets in one shot. Besides that, in order to support UDP GSO feature, multiple data shall be concatenated in a continued buffer. At present, it is possible to fetch data then feed to gnutls_record_recv(), but still hard to deal with send(). 

Hence could it be possible for gnutls to expose some buffer management API?

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