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Handle G_IO_HUP in tcp_chr_read for tcp chardev 

Since commit cdaa86a54b
("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 cdaa86a54b
("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>
This commit is contained in:
Kirill Batuzov 2014-07-01 15:52:32 +04:00 committed by Michael S. Tsirkin
parent 85d1277e66
commit 812c1057f6
2 changed files with 6 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/sysemu/char.h
View File

@ -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;
};

27
qemu-char.c
View File

@ -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);
}