On Mon, 26 Apr 2010 13:25:38 -0500
Anthony Liguori <anth...@codemonkey.ws> wrote:
> On 04/26/2010 01:22 PM, Luiz Capitulino wrote:
> > On Mon, 26 Apr 2010 12:49:40 -0500
> > Anthony Liguori<anth...@codemonkey.ws> wrote:
> >
> >
> >> On 04/26/2010 10:47 AM, Luiz Capitulino wrote:
> >>
> >>> The 'quit' Monitor command (implemented by do_quit()) calls
> >>> exit() directly, this is problematic under QMP because QEMU
> >>> exits before having a chance to send the ok response.
> >>>
> >>> Clients don't know if QEMU exited because of a problem or
> >>> because the 'quit' command has been executed.
> >>>
> >>> This commit fixes that by moving the exit() call to the main
> >>> loop, so that do_quit() requests the system to quit, instead
> >>> of calling exit() directly.
> >>>
> >>>
> >> Does this also have the effect of printing out a (qemu) prompt after
> >> quit before an EOF appears on that socket?
> >>
> > Ah, right..
> >
>
> It's not necessarily a bad thing if it does. I just wanted to raise
> that because it's possible that someone depends on the behavior.
Yes, and it's also a bit ugly if you do '-monitor stdio':
~/stuff/virt/ ./qemu-qmp -monitor stdio
QEMU 0.12.50 monitor - type 'help' for more information
(qemu) quit
(qemu) ~/stuff/virt/
So, I'd like to fix it.
> I'm not sure it matters to me if we change this behavior though.
It's very easy to fix, the following patch does it.
I have (tested and) rebased the for-anthony branch with it.
From 14ecef47d1989f9b646fc0fe7a4bf42c091d1432 Mon Sep 17 00:00:00 2001
From: Luiz Capitulino <lcapitul...@redhat.com>
Date: Tue, 6 Apr 2010 18:55:54 -0300
Subject: [PATCH 5/9] Monitor: Return before exiting with 'quit'
The 'quit' Monitor command (implemented by do_quit()) calls
exit() directly, this is problematic under QMP because QEMU
exits before having a chance to send the ok response.
Clients don't know if QEMU exited because of a problem or
because the 'quit' command has been executed.
This commit fixes that by moving the exit() call to the main
loop, so that do_quit() requests the system to quit, instead
of calling exit() directly.
Signed-off-by: Luiz Capitulino <lcapitul...@redhat.com>
---
monitor.c | 7 ++++++-
sysemu.h | 2 ++
vl.c | 18 ++++++++++++++++++
3 files changed, 26 insertions(+), 1 deletions(-)
diff --git a/monitor.c b/monitor.c
index ef84298..5b0258f 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1017,7 +1017,12 @@ static void do_info_cpu_stats(Monitor *mon)
*/
static int do_quit(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
- exit(0);
+ if (monitor_ctrl_mode(mon)) {
+ qemu_system_exit_request();
+ } else {
+ exit(0);
+ }
+
return 0;
}
diff --git a/sysemu.h b/sysemu.h
index d0effa0..fa921df 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -45,9 +45,11 @@ void cpu_disable_ticks(void);
void qemu_system_reset_request(void);
void qemu_system_shutdown_request(void);
void qemu_system_powerdown_request(void);
+void qemu_system_exit_request(void);
int qemu_shutdown_requested(void);
int qemu_reset_requested(void);
int qemu_powerdown_requested(void);
+int qemu_exit_requested(void);
extern qemu_irq qemu_system_powerdown;
void qemu_system_reset(void);
diff --git a/vl.c b/vl.c
index a5a0f41..9ef6f2c 100644
--- a/vl.c
+++ b/vl.c
@@ -1697,6 +1697,7 @@ static int shutdown_requested;
static int powerdown_requested;
int debug_requested;
int vmstop_requested;
+static int exit_requested;
int qemu_shutdown_requested(void)
{
@@ -1719,6 +1720,12 @@ int qemu_powerdown_requested(void)
return r;
}
+int qemu_exit_requested(void)
+{
+ /* just return it, we'll exit() anyway */
+ return exit_requested;
+}
+
static int qemu_debug_requested(void)
{
int r = debug_requested;
@@ -1789,6 +1796,12 @@ void qemu_system_powerdown_request(void)
qemu_notify_event();
}
+void qemu_system_exit_request(void)
+{
+ exit_requested = 1;
+ qemu_notify_event();
+}
+
#ifdef _WIN32
static void host_main_loop_wait(int *timeout)
{
@@ -1925,6 +1938,8 @@ static int vm_can_run(void)
return 0;
if (debug_requested)
return 0;
+ if (exit_requested)
+ return 0;
return 1;
}
@@ -1977,6 +1992,9 @@ static void main_loop(void)
if ((r = qemu_vmstop_requested())) {
vm_stop(r);
}
+ if (qemu_exit_requested()) {
+ exit(0);
+ }
}
pause_all_vcpus();
}
--
1.7.1.rc1.12.ga6018
