s3: smbd: Fix Linux sendfile() for SMB2. Ensure we don't spin on EAGAIN.
authorJeremy Allison <jra@samba.org>
Wed, 18 Jul 2018 20:32:49 +0000 (13:32 -0700)
committerKarolin Seeger <kseeger@samba.org>
Mon, 13 Aug 2018 10:56:36 +0000 (12:56 +0200)
commit37e2ff724ed0c295c80ce0707596e3d0b3e70aa4
tree6ee6be7a0b1b09e9060840dc6c2d45099dcaf2a6
parent357d2b658225825227c5d8ff35704e902c17cf01
s3: smbd: Fix Linux 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 809967b3eab7a1b48c186517701538ca93536246)
source3/lib/sendfile.c