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
Handle G_IO_HUP in tcp_chr_read. It is already watched by corresponding watch. Also remove the second watch with its handler. This reverts commit cdaa86a54b232572bba594bf87a7416e527e460c. ("Add G_IO_HUP handler for socket chardev") but keeps its functionality. Cc: Antonios Motakis <a.mota...@virtualopensystems.com> Cc: Nikolay Nikolaev <n.nikol...@virtualopensystems.com> Cc: Michael S. Tsirkin <m...@redhat.com> Signed-off-by: Kirill Batuzov <batuz...@ispras.ru> Signed-off-by: Nikita Belov <zod...@ispras.ru> --- GLib limitation resulted 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). --- include/sysemu/char.h | 1 - qemu-char.c | 27 ++++++--------------------- 2 files changed, 6 insertions(+), 22 deletions(-) diff --git a/include/sysemu/char.h b/include/sysemu/char.h index c8b15f9..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); } -- 1.7.10.4