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author | Peter Hutterer <peter.hutterer@who-t.net> | 2012-03-05 14:12:52 +1000 |
---|---|---|
committer | Peter Hutterer <peter.hutterer@who-t.net> | 2012-03-22 11:33:42 +1000 |
commit | c0b0a9bce9237b0abe150c1a7b54939affecc751 (patch) | |
tree | b14f1d504c2e362c124a2e20a6d48eaec124a088 /dix/Xserver.d | |
parent | ab3a815a75ab5695753fa37a98b0ea5293d4cb91 (diff) |
dix: add dtrace probes to input API
For driver debugging, it is helpful to know whether the driver has actually
submitted an event to the server. dtrace hooks can help here.
Note that GetPointerEvents and friends may also be triggered by the server
for other emulated devices, some care must be taken when analysing the
results.
Additional difficulty: proximity events have a run-time assigned type, so
this may make automatic detection a tad harder. If in doubt, go for any
event > 64 since the only two that can have that value are ProximityIn and
ProximityOut.
An example systemtap script is below:
# Compile+run with
# stap -g xorg.stp /usr/bin/Xorg
#
function print_valuators:string(nvaluators:long, mask_in:long, valuators_in:long) %{
int i;
unsigned char *mask = (unsigned char*)THIS->mask_in;
double *valuators = (double*)THIS->valuators_in;
char str[128] = {0};
char *s = str;
#define BitIsSet(ptr, bit) (((unsigned char*)(ptr))[(bit)>>3] & (1 << ((bit) & 7)))
s += sprintf(s, "nval: %d ::", (int)THIS->nvaluators);
for (i = 0; i < THIS->nvaluators; i++)
{
s += sprintf(s, " %d: ", i);
if (BitIsSet(mask, i))
s += sprintf(s, "%d", (int)valuators[i]);
}
sprintf(THIS->__retvalue, "%s", str);
%}
probe process(@1).mark("input__event")
{
deviceid = $arg1
type = $arg2
detail = $arg3
flags = $arg4
nvaluators = $arg5
str = print_valuators(nvaluators, $arg6, $arg7)
printf("Event: device %d type %d detail %d flags %#x %s\n",
deviceid, type, detail, flags, str);
}
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Jeremy Huddleston <jeremyhu@apple.com>
Diffstat (limited to 'dix/Xserver.d')
-rw-r--r-- | dix/Xserver.d | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/dix/Xserver.d b/dix/Xserver.d index 2ad337351..248d48e24 100644 --- a/dix/Xserver.d +++ b/dix/Xserver.d @@ -48,6 +48,8 @@ provider Xserver { probe resource__free(uint32_t, uint32_t, void *, string); /* client id, event type, event* */ probe send__event(int, uint8_t, void *); + /* deviceid, type, button/keycode/touchid, flags, nvalues, mask, values */ + probe input__event(int, int, uint32_t, uint32_t, int8_t, uint8_t*, double*); }; #pragma D attributes Unstable/Unstable/Common provider Xserver provider |