[Qemu-devel] [PATCH v10 05/18] Add G_IO_HUP handler for socket chardev

[Nikolay Nikolaev]

This is used to detect that the remote end has disconnected. Just call
tcp_char_disconnect on receiving this event.

Signed-off-by: Antonios Motakis <a.mota...@virtualopensystems.com>
Signed-off-by: Nikolay Nikolaev <n.nikol...@virtualopensystems.com>
---
 include/sysemu/char.h |    1 +
 qemu-char.c           |   21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/sysemu/char.h b/include/sysemu/char.h
index 82eaaf5..f14ab06 100644
--- a/include/sysemu/char.h
+++ b/include/sysemu/char.h
@@ -83,6 +83,7 @@ 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 e5c1cf9..c18899e 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2674,6 +2674,25 @@ 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;
@@ -2683,6 +2702,8 @@ 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);
 }