log: Make glib logging go through QEMU

This commit adds a error_init() helper which calls
g_log_set_default_handler() so that glib logs (g_log, g_warning, ...)
are handled similarly to other QEMU logs. This means they will get a
timestamp if timestamps are enabled, and they will go through the
HMP monitor if one is configured.

This commit also adds a call to error_init() to the binaries
installed by QEMU. Since error_init() also calls error_set_progname(),
this means that *-linux-user, *-bsd-user and qemu-pr-helper messages
output with error_report, info_report, ... will slightly change: they
will be prefixed by the binary name.

glib debug messages are enabled through G_MESSAGES_DEBUG similarly to
the glib default log handler.

At the moment, this change will mostly impact SPICE logging if your
spice version is >= 0.14.1. With older spice versions, this is not going
to work as expected, but will not have any ill effect, so this call is
not conditional on the SPICE version.

Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20190131164614.19209-3-cfergeau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/bsd-user/main.c b/bsd-user/main.c
index 0d3156974c..8fd8ae4127 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -24,6 +24,7 @@
 #include "qapi/error.h"
 #include "qemu.h"
 #include "qemu/config-file.h"
+#include "qemu/error-report.h"
 #include "qemu/path.h"
 #include "qemu/help_option.h"
 #include "cpu.h"
@@ -743,6 +744,7 @@ int main(int argc, char **argv)
     if (argc <= 1)
         usage();
 
+    error_init(argv[0]);
     module_call_init(MODULE_INIT_TRACE);
     qemu_init_cpu_list();
     module_call_init(MODULE_INIT_QOM);