s3: smbd: Fix Solaris sendfile() for SMB2. Ensure we don't spin on EAGAIN.
For SMB2 the socket is set non-blocking. Ensure sendfile()
calls complete if they return EAGAIN by saving the socket state,
setting it blocking, doing the sendfile until completion and then
restoring the socket state.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13537
Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
(cherry picked from commit
16a587075c8c62c1160869358ca56a133e90247a)