From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:35531) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TTxom-0002Qu-6C for qemu-devel@nongnu.org; Thu, 01 Nov 2012 12:40:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TTxok-0004Bc-KE for qemu-devel@nongnu.org; Thu, 01 Nov 2012 12:40:32 -0400 Received: from mx1.redhat.com ([209.132.183.28]:58787) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TTxi8-0002HW-7f for qemu-devel@nongnu.org; Thu, 01 Nov 2012 12:33:40 -0400 Date: Thu, 1 Nov 2012 14:33:29 -0200 From: Luiz Capitulino Message-ID: <20121101143329.2e78f226@doriath.home> In-Reply-To: <20121101162213.GJ16157@illuin> References: <1351705520-24589-1-git-send-email-lcapitulino@redhat.com> <1351705520-24589-5-git-send-email-lcapitulino@redhat.com> <20121101162213.GJ16157@illuin> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 4/5] qemu-ga: win32: isolate virtio-serial specific code List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Michael Roth Cc: qemu-devel@nongnu.org On Thu, 1 Nov 2012 11:22:13 -0500 Michael Roth wrote: > On Wed, Oct 31, 2012 at 03:45:19PM -0200, Luiz Capitulino wrote: > > This commit prepares ga_channel_new(), ga_channel_read() and > > ga_channel_open() for isa-serial support. > > > > Signed-off-by: Luiz Capitulino > > Reviewed-by: Michael Roth > > Though I'm wondering if it'd be nicer to: > > 1) Add a GAChannelOps struct with pointers for init/read/write/write_all > 2) Move all the method-specific init stuff from ga_channel_new() into > method-specific init functions (which all use ga_channel_open() as > a general helper function, or maybe roll the CreateFile() into the > init routines with the proper flags hard-coded > 3) Have ga_channel_new() simply hang the proper GAChannelOps* off of > the GAChannel it create and then call GAChannel->ops->init(self) > 4) Make ga_channel_read/write/write_all(self) wrappers around > GAChannel->ops->read/write/write_all(self) Can this be a future improvement? I was also wondering if it would be good to have GAOps instead of having global functions for win32 & posix. > > > --- > > 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 > > >