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authorKirill Batuzov <batuzovk@ispras.ru>2014-07-01 15:52:32 +0400
committerMichael S. Tsirkin <mst@redhat.com>2014-07-06 09:13:54 +0300
commit812c1057f6175ac9a9829fa2920a2b5783814193 (patch)
treeb12d8756b1ce00662d4b910c5b02c1a539ff6f02
parent85d1277e668106294d134a101729c6f36289da1a (diff)
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Handle G_IO_HUP in tcp_chr_read for tcp chardev
Since commit cdaa86a54b232572bba594bf87a7416e527e460c ("Add G_IO_HUP handler for socket chardev") GLib limitation results in a bug on Windows host. Steps to reproduce: Start qemu: qemu-system-i386 -qmp tcp:127.0.0.1:4444:server:nowait Connect with telnet: telnet 127.0.0.1 4444 Try sending some data from telnet. Expected result: answers from QEMU. Observed result: no answers (actually tcp_chr_read is not called at all). Due to GLib limitations it is not possible to create several watches on one channel on Windows hosts. See bug #338943 in GNOME bugzilla for details: https://bugzilla.gnome.org/show_bug.cgi?id=338943 This reimplements commit cdaa86a54b232572bba594bf87a7416e527e460c ("Add G_IO_HUP handler for socket chardev") using a single watch: Handle G_IO_HUP in tcp_chr_read instead. It is already watched by a corresponding watch. Remove the second watch with its handler. Cc: Antonios Motakis <a.motakis@virtualopensystems.com> Cc: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com> Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Kirill Batuzov <batuzovk@ispras.ru> Signed-off-by: Nikita Belov <zodiac@ispras.ru> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
-rw-r--r--include/sysemu/char.h1
-rw-r--r--qemu-char.c27
2 files changed, 6 insertions, 22 deletions
diff --git a/include/sysemu/char.h b/include/sysemu/char.h
index c8b15f97..0bbd631 100644
--- a/include/sysemu/char.h
+++ b/include/sysemu/char.h
@@ -84,7 +84,6 @@ struct CharDriverState {
int avail_connections;
int is_mux;
guint fd_in_tag;
- guint fd_hup_tag;
QemuOpts *opts;
QTAILQ_ENTRY(CharDriverState) next;
};
diff --git a/qemu-char.c b/qemu-char.c
index 51917de..22a9777 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2673,6 +2673,12 @@ static gboolean tcp_chr_read(GIOChannel *chan, GIOCondition cond, void *opaque)
uint8_t buf[READ_BUF_LEN];
int len, size;
+ if (cond & G_IO_HUP) {
+ /* connection closed */
+ tcp_chr_disconnect(chr);
+ return TRUE;
+ }
+
if (!s->connected || s->max_size <= 0) {
return TRUE;
}
@@ -2724,25 +2730,6 @@ CharDriverState *qemu_chr_open_eventfd(int eventfd)
}
#endif
-static gboolean tcp_chr_chan_close(GIOChannel *channel, GIOCondition cond,
- void *opaque)
-{
- CharDriverState *chr = opaque;
-
- if (cond != G_IO_HUP) {
- return FALSE;
- }
-
- /* connection closed */
- tcp_chr_disconnect(chr);
- if (chr->fd_hup_tag) {
- g_source_remove(chr->fd_hup_tag);
- chr->fd_hup_tag = 0;
- }
-
- return TRUE;
-}
-
static void tcp_chr_connect(void *opaque)
{
CharDriverState *chr = opaque;
@@ -2752,8 +2739,6 @@ static void tcp_chr_connect(void *opaque)
if (s->chan) {
chr->fd_in_tag = io_add_watch_poll(s->chan, tcp_chr_read_poll,
tcp_chr_read, chr);
- chr->fd_hup_tag = g_io_add_watch(s->chan, G_IO_HUP, tcp_chr_chan_close,
- chr);
}
qemu_chr_be_generic_open(chr);
}