[Qemu-devel] [PATCH v2 for-2.12] gdbstub: send a termination packet instead of crashing gdb

[KONRAD Frederic <frederic.konrad@adacore.com>]

Since the commit:
commit 4486e89c219c0d1b9bd8dfa0b1dd5b0d51ff2268
Author: Stefan Hajnoczi <stefanha@redhat.com>
Date:   Wed Mar 7 14:42:05 2018 +0000

    vl: introduce vm_shutdown()

GDB crashes when qemu exits (at least on sparc-softmmu):
Remote communication error.  Target disconnected.: Connection reset by peer.
Quitting: putpkt: write failed: Broken pipe.

So send a packet to exit GDB before we exit QEMU:
[Inferior 1 (Thread 0) exited normally]

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: KONRAD Frederic <frederic.konrad@adacore.com>
---

Notes:
    V1 -> V2:
      * fix typos
      * mark the patch for-2.12

 gdbstub.c              | 7 +++++++
 include/exec/gdbstub.h | 2 ++
 vl.c                   | 2 ++
 3 files changed, 11 insertions(+)

diff --git a/gdbstub.c b/gdbstub.c
index f1d5148..a76b2fa 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -2052,6 +2052,13 @@ int gdbserver_start(const char *device)
     return 0;
 }
 
+void gdbserver_cleanup(void)
+{
+    if (gdbserver_state) {
+        put_packet(gdbserver_state, "W00");
+    }
+}
+
 static void register_types(void)
 {
     type_register_static(&char_gdb_type_info);
diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h
index 9aa7756..2e8a4b8 100644
--- a/include/exec/gdbstub.h
+++ b/include/exec/gdbstub.h
@@ -103,6 +103,8 @@ int gdbserver_start(int);
 int gdbserver_start(const char *port);
 #endif
 
+void gdbserver_cleanup(void);
+
 /**
  * gdb_has_xml:
  * This is an ugly hack to cope with both new and old gdb.
diff --git a/vl.c b/vl.c
index 19340a3..cd8d5cb 100644
--- a/vl.c
+++ b/vl.c
@@ -4725,6 +4725,8 @@ int main(int argc, char **argv, char **envp)
 
     main_loop();
 
+    gdbserver_cleanup();
+
     /* No more vcpu or device emulation activity beyond this point */
     vm_shutdown();
 
-- 
1.8.3.1