[Qemu-devel] [PATCH 4/5] qemu-ga: win32: isolate virtio-serial specific code

[Luiz Capitulino <lcapitulino@redhat.com>]

This commit prepares ga_channel_new(), ga_channel_read() and
ga_channel_open() for isa-serial support.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 qga/channel-win32.c | 75 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 42 insertions(+), 33 deletions(-)

diff --git a/qga/channel-win32.c b/qga/channel-win32.c
index 8e259c3..c173270 100644
--- a/qga/channel-win32.c
+++ b/qga/channel-win32.c
@@ -213,14 +213,20 @@ GIOStatus ga_channel_read(GAChannel *c, char *buf, size_t size, gsize *count)
         return G_IO_STATUS_ERROR;
     }
 
-    *count = to_read = MIN(size, rs->pending);
-    if (to_read) {
-        memcpy(buf, rs->buf + rs->cur, to_read);
-        rs->cur += to_read;
-        rs->pending -= to_read;
-        status = G_IO_STATUS_NORMAL;
-    } else {
-        status = G_IO_STATUS_AGAIN;
+    switch (c->method) {
+    case GA_CHANNEL_VIRTIO_SERIAL:
+        *count = to_read = MIN(size, rs->pending);
+        if (to_read) {
+            memcpy(buf, rs->buf + rs->cur, to_read);
+            rs->cur += to_read;
+            rs->pending -= to_read;
+            status = G_IO_STATUS_NORMAL;
+        } else {
+            status = G_IO_STATUS_AGAIN;
+        }
+        break;
+    default:
+        abort(); /* impossible */
     }
 
     return status;
@@ -285,23 +291,11 @@ GIOStatus ga_channel_write_all(GAChannel *c, const char *buf, size_t size)
     return status;
 }
 
-static gboolean ga_channel_open(GAChannel *c, GAChannelMethod method,
-                                const gchar *path)
+static gboolean ga_channel_open(GAChannel *c, const gchar *path, int flags)
 {
-    if (!method == GA_CHANNEL_VIRTIO_SERIAL) {
-        g_critical("unsupported communication method");
-        return false;
-    }
-
     c->handle = CreateFile(path, GENERIC_READ | GENERIC_WRITE, 0, NULL,
-                           OPEN_EXISTING,
-                           FILE_FLAG_NO_BUFFERING | FILE_FLAG_OVERLAPPED, NULL);
-    if (c->handle == INVALID_HANDLE_VALUE) {
-        g_critical("error opening path");
-        return false;
-    }
-
-    return true;
+                           OPEN_EXISTING, FILE_FLAG_NO_BUFFERING | flags, NULL);
+    return (c->handle == INVALID_HANDLE_VALUE) ? false : true;
 }
 
 GAChannel *ga_channel_new(GAChannelMethod method, const gchar *path,
@@ -310,27 +304,42 @@ GAChannel *ga_channel_new(GAChannelMethod method, const gchar *path,
     GAChannel *c = g_malloc0(sizeof(GAChannel));
     SECURITY_ATTRIBUTES sec_attrs;
 
-    if (!ga_channel_open(c, method, path)) {
-        g_critical("error opening channel");
-        g_free(c);
-        return NULL;
+    switch (method) {
+    case GA_CHANNEL_VIRTIO_SERIAL:
+        if (!ga_channel_open(c, path, FILE_FLAG_OVERLAPPED)) {
+            g_critical("error opening channel (path: %s)", path);
+            goto out_err;
+        }
+
+        sec_attrs.nLength = sizeof(SECURITY_ATTRIBUTES);
+        sec_attrs.lpSecurityDescriptor = NULL;
+        sec_attrs.bInheritHandle = false;
+        c->rstate.ov.hEvent = CreateEvent(&sec_attrs, FALSE, FALSE, NULL);
+        if (!c->rstate.ov.hEvent) {
+            g_critical("can't create event");
+            goto out_err;
+        }
+
+        c->source = ga_channel_create_watch_ov(c);
+        break;
+    default:
+        g_critical("unsupported communication method");
+        goto out_err;
     }
 
     c->cb = cb;
     c->user_data = opaque;
     c->method = method;
 
-    sec_attrs.nLength = sizeof(SECURITY_ATTRIBUTES);
-    sec_attrs.lpSecurityDescriptor = NULL;
-    sec_attrs.bInheritHandle = false;
-
     c->rstate.buf_size = QGA_READ_COUNT_DEFAULT;
     c->rstate.buf = g_malloc(QGA_READ_COUNT_DEFAULT);
-    c->rstate.ov.hEvent = CreateEvent(&sec_attrs, FALSE, FALSE, NULL);
 
-    c->source = ga_channel_create_watch_ov(c);
     g_source_attach(c->source, NULL);
     return c;
+
+out_err:
+    g_free(c);
+    return NULL;
 }
 
 void ga_channel_free(GAChannel *c)
-- 
1.7.12.315.g682ce8b