[gnutls-devel] GnuTLS | gnutls_record_send_file() moves file descriptor offset while sending (#1580)

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Brian Denton created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1580



## Description of problem:
gnutls_record_send_file() moves file descriptor offset while sending, this impacts multi-threading applications that hold a single file descriptor open with multiple concurrent sendfile()s.

I thought about creating a patch to change read() to pread(), however win32 does not have pread() available so I don't know what the desired approach would be.

## Version of gnutls used:
3.8.0

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)
Gentoo Linux

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