| Message ID | 20211019092901.1519570-1-alex.bennee@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] chardev: don't exit() straight away on C-a x | expand |
On 10/19/21 11:29, Alex Bennée wrote: > While there are a number of uses in the code-base of the exit(0) > pattern it gets in the way of clean exit which can do all of it's > house-keeping. In particular it was reported that you can crash > plugins this way because TCG can still be running on other threads > when the atexit callback is called. > > Use qmp_quit() instead which takes care of some housekeeping before > triggering the shutdown. > > Signed-off-by: Alex Bennée <alex.bennee@linaro.org> > Reported-by: Lukas Jünger <lukas.junger@greensocs.com> > Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> > Message-Id: <20211018140226.838137-1-alex.bennee@linaro.org> > > --- > v2 > - use qmp_quit instead of direct qemu_system_shutdown_request > - g_assert_not_reached() for the stub definition > --- > chardev/char-mux.c | 3 ++- > stubs/qmp-quit.c | 8 ++++++++ > stubs/meson.build | 1 + > 3 files changed, 11 insertions(+), 1 deletion(-) > create mode 100644 stubs/qmp-quit.c Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
On 19/10/21 11:29, Alex Bennée wrote: > While there are a number of uses in the code-base of the exit(0) > pattern it gets in the way of clean exit which can do all of it's > house-keeping. In particular it was reported that you can crash > plugins this way because TCG can still be running on other threads > when the atexit callback is called. > > Use qmp_quit() instead which takes care of some housekeeping before > triggering the shutdown. > > Signed-off-by: Alex Bennée <alex.bennee@linaro.org> > Reported-by: Lukas Jünger <lukas.junger@greensocs.com> > Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> > Message-Id: <20211018140226.838137-1-alex.bennee@linaro.org> > > --- > v2 > - use qmp_quit instead of direct qemu_system_shutdown_request > - g_assert_not_reached() for the stub definition Either g_assert_not_reached() or exit(0) should be okay, so Acked-by: Paolo Bonzini <pbonzini@redhat.com> Thanks, Paolo > --- > chardev/char-mux.c | 3 ++- > stubs/qmp-quit.c | 8 ++++++++ > stubs/meson.build | 1 + > 3 files changed, 11 insertions(+), 1 deletion(-) > create mode 100644 stubs/qmp-quit.c > > diff --git a/chardev/char-mux.c b/chardev/char-mux.c > index ada0c6866f..ee2d47b20d 100644 > --- a/chardev/char-mux.c > +++ b/chardev/char-mux.c > @@ -28,6 +28,7 @@ > #include "qemu/option.h" > #include "chardev/char.h" > #include "sysemu/block-backend.h" > +#include "qapi/qapi-commands-control.h" > #include "chardev-internal.h" > > /* MUX driver for serial I/O splitting */ > @@ -157,7 +158,7 @@ static int mux_proc_byte(Chardev *chr, MuxChardev *d, int ch) > { > const char *term = "QEMU: Terminated\n\r"; > qemu_chr_write_all(chr, (uint8_t *)term, strlen(term)); > - exit(0); > + qmp_quit(NULL); > break; > } > case 's': > diff --git a/stubs/qmp-quit.c b/stubs/qmp-quit.c > new file mode 100644 > index 0000000000..a3ff47f7bd > --- /dev/null > +++ b/stubs/qmp-quit.c > @@ -0,0 +1,8 @@ > +#include "qemu/osdep.h" > +#include "qapi/qapi-commands-control.h" > +#include "qapi/qmp/dispatch.h" > + > +void qmp_quit(Error **errp) > +{ > + g_assert_not_reached(); > +} > diff --git a/stubs/meson.build b/stubs/meson.build > index f6aa3aa94f..71469c1d50 100644 > --- a/stubs/meson.build > +++ b/stubs/meson.build > @@ -31,6 +31,7 @@ stub_ss.add(files('pci-bus.c')) > stub_ss.add(files('qemu-timer-notify-cb.c')) > stub_ss.add(files('qmp_memory_device.c')) > stub_ss.add(files('qmp-command-available.c')) > +stub_ss.add(files('qmp-quit.c')) > stub_ss.add(files('qtest.c')) > stub_ss.add(files('ram-block.c')) > stub_ss.add(files('ramfb.c')) >
diff --git a/chardev/char-mux.c b/chardev/char-mux.c index ada0c6866f..ee2d47b20d 100644 --- a/chardev/char-mux.c +++ b/chardev/char-mux.c @@ -28,6 +28,7 @@ #include "qemu/option.h" #include "chardev/char.h" #include "sysemu/block-backend.h" +#include "qapi/qapi-commands-control.h" #include "chardev-internal.h" /* MUX driver for serial I/O splitting */ @@ -157,7 +158,7 @@ static int mux_proc_byte(Chardev *chr, MuxChardev *d, int ch) { const char *term = "QEMU: Terminated\n\r"; qemu_chr_write_all(chr, (uint8_t *)term, strlen(term)); - exit(0); + qmp_quit(NULL); break; } case 's': diff --git a/stubs/qmp-quit.c b/stubs/qmp-quit.c new file mode 100644 index 0000000000..a3ff47f7bd --- /dev/null +++ b/stubs/qmp-quit.c @@ -0,0 +1,8 @@ +#include "qemu/osdep.h" +#include "qapi/qapi-commands-control.h" +#include "qapi/qmp/dispatch.h" + +void qmp_quit(Error **errp) +{ + g_assert_not_reached(); +} diff --git a/stubs/meson.build b/stubs/meson.build index f6aa3aa94f..71469c1d50 100644 --- a/stubs/meson.build +++ b/stubs/meson.build @@ -31,6 +31,7 @@ stub_ss.add(files('pci-bus.c')) stub_ss.add(files('qemu-timer-notify-cb.c')) stub_ss.add(files('qmp_memory_device.c')) stub_ss.add(files('qmp-command-available.c')) +stub_ss.add(files('qmp-quit.c')) stub_ss.add(files('qtest.c')) stub_ss.add(files('ram-block.c')) stub_ss.add(files('ramfb.c'))