>From da7e6cd863ed0cffe885cd2d3639f92c82baf6e2 Mon Sep 17 00:00:00 2001

From: Amit Shah <amit.shah@redhat.com>

Date: Mon, 21 Mar 2011 20:32:58 +0100

Subject: [PATCH 07/17] iohandlers: Add enable/disable_write_fd_handler() functions

These will be used to provide a cleaner API for the nonblocking case.

Signed-off-by: Amit Shah <amit.shah@redhat.com>

---

 qemu-char.h |    3 +++

 vl.c        |   35 +++++++++++++++++++++++++++++++++++

 2 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/qemu-char.h b/qemu-char.h

index 7a1924c..185377c 100644

--- a/qemu-char.h

+++ b/qemu-char.h

@@ -116,6 +116,9 @@ size_t qemu_chr_mem_osize(const CharDriverState *chr);

 /* async I/O support */

+void enable_write_fd_handler(int fd, IOHandler *fd_write);

+void disable_write_fd_handler(int fd);

+

 int qemu_set_fd_handler2(int fd,

                          IOCanReadHandler *fd_read_poll,

                          IOHandler *fd_read,

diff --git a/vl.c b/vl.c

index 85c36e3..95f51cb 100644

--- a/vl.c

+++ b/vl.c

@@ -1044,6 +1044,41 @@ typedef struct IOHandlerRecord {

 static QLIST_HEAD(, IOHandlerRecord) io_handlers =

     QLIST_HEAD_INITIALIZER(io_handlers);

+static IOHandlerRecord *find_iohandler(int fd)

+{

+    IOHandlerRecord *ioh;

+

+    QLIST_FOREACH(ioh, &io_handlers, next) {

+        if (ioh->fd == fd) {

+            return ioh;

+        }

+    }

+    return NULL;

+}

+

+void enable_write_fd_handler(int fd, IOHandler *fd_write)

+{

+    IOHandlerRecord *ioh;

+

+    ioh = find_iohandler(fd);

+    if (!ioh) {

+        return;

+    }

+

+    ioh->fd_write = fd_write;

+}

+

+void disable_write_fd_handler(int fd)

+{

+    IOHandlerRecord *ioh;

+

+    ioh = find_iohandler(fd);

+    if (!ioh) {

+        return;

+    }

+

+    ioh->fd_write = NULL;

+}

 /* XXX: fd_read_poll should be suppressed, but an API change is

    necessary in the character devices to suppress fd_can_read(). */

-- 

1.7.3.2