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d="scan'208";a="84920461" From: Andrew Cooper To: Xen-devel CC: =?UTF-8?q?Edwin=20T=C3=B6r=C3=B6k?= , Andrew Cooper , Christian Lindig , David Scott , Rob Hoes Subject: [PATCH 3/8] tools/ocaml/evtchn: Add binding for xenevtchn_fdopen() Date: Tue, 22 Nov 2022 15:20:38 +0000 Message-ID: <20221122152043.8518-4-andrew.cooper3@citrix.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20221122152043.8518-1-andrew.cooper3@citrix.com> References: <20221122152043.8518-1-andrew.cooper3@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @citrix.com) X-ZM-MESSAGEID: 1669130492274100004 From: Edwin T=C3=B6r=C3=B6k For live update, the new oxenstored needs to reconstruct an evtchn object around an existing file descriptor. Signed-off-by: Edwin T=C3=B6r=C3=B6k Signed-off-by: Andrew Cooper Acked-by: Christian Lindig --- CC: Christian Lindig CC: David Scott CC: Edwin Torok CC: Rob Hoes Split out of combined patch --- tools/ocaml/libs/eventchn/xeneventchn.ml | 1 + tools/ocaml/libs/eventchn/xeneventchn.mli | 4 ++++ tools/ocaml/libs/eventchn/xeneventchn_stubs.c | 19 +++++++++++++++++++ 3 files changed, 24 insertions(+) diff --git a/tools/ocaml/libs/eventchn/xeneventchn.ml b/tools/ocaml/libs/ev= entchn/xeneventchn.ml index dd00a1f0ead5..be4de82f46b9 100644 --- a/tools/ocaml/libs/eventchn/xeneventchn.ml +++ b/tools/ocaml/libs/eventchn/xeneventchn.ml @@ -17,6 +17,7 @@ type handle =20 external init: unit -> handle =3D "stub_eventchn_init" +external fdopen: Unix.file_descr -> handle =3D "stub_eventchn_fdopen" external fd: handle -> Unix.file_descr =3D "stub_eventchn_fd" =20 type t =3D int diff --git a/tools/ocaml/libs/eventchn/xeneventchn.mli b/tools/ocaml/libs/e= ventchn/xeneventchn.mli index 08c73376438e..98b3c86f3702 100644 --- a/tools/ocaml/libs/eventchn/xeneventchn.mli +++ b/tools/ocaml/libs/eventchn/xeneventchn.mli @@ -47,6 +47,10 @@ val init: unit -> handle (** Return an initialised event channel interface. On error it will throw a Failure exception. *) =20 +val fdopen: Unix.file_descr -> handle +(** Return an initialised event channel interface, from an already open ev= tchn + file descriptor. On error it will throw a Failure exception. *) + val fd: handle -> Unix.file_descr (** Return a file descriptor suitable for Unix.select. When the descriptor becomes readable, it is safe to call 'pending'. diff --git a/tools/ocaml/libs/eventchn/xeneventchn_stubs.c b/tools/ocaml/li= bs/eventchn/xeneventchn_stubs.c index 37f1cc4e1478..7bdf711bc150 100644 --- a/tools/ocaml/libs/eventchn/xeneventchn_stubs.c +++ b/tools/ocaml/libs/eventchn/xeneventchn_stubs.c @@ -69,6 +69,25 @@ CAMLprim value stub_eventchn_init(void) CAMLreturn(result); } =20 +CAMLprim value stub_eventchn_fdopen(value fdval) +{ + CAMLparam1(fdval); + CAMLlocal1(result); + xenevtchn_handle *xce; + + caml_enter_blocking_section(); + xce =3D xenevtchn_fdopen(NULL, Int_val(fdval), 0); + caml_leave_blocking_section(); + + if (xce =3D=3D NULL) + caml_failwith("evtchn fdopen failed"); + + result =3D caml_alloc_custom(&xenevtchn_ops, sizeof(xce), 0, 1); + _H(result) =3D xce; + + CAMLreturn(result); +} + CAMLprim value stub_eventchn_fd(value xce) { CAMLparam1(xce); --=20 2.11.0