Use typedefs to work around dtrace dropping const qualifiers from probe
arguments when generating Xserver-dtrace.h. Add new probes.h header to
avoid having to replicate these typedefs in every file with dtrace probes.
Gets rid of these warnings from gcc 4.8:
getevents.c:1096:9:
warning: passing argument 6 of '__dtrace_Xserver___input__event' discards
'const' qualifier from pointer target type [enabled by default]
getevents.c:1096:9:
warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
'const' qualifier from pointer target type [enabled by default]
getevents.c:1651:9:
warning: passing argument 6 of '__dtrace_Xserver___input__event' disards
'const' qualifier from pointer target type [enabled by default]
getevents.c:1651:9:
warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
'const' qualifier from pointer target type [enabled by default]
getevents.c:1791:9:
warning: passing argument 6 of '__dtrace_Xserver___input__event' disards
'const' qualifier from pointer target type [enabled by default]
getevents.c:1791:9:
warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
'const' qualifier from pointer target type [enabled by default]
getevents.c:1921:9:
warning: passing argument 6 of '__dtrace_Xserver___input__event' disards
'const' qualifier from pointer target type [enabled by default]
getevents.c:1921:9:
warning: passing argument 7 of '__dtrace_Xserver___input__event' disards
'const' qualifier from pointer target type [enabled by default]
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
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>