Hi, I'm experiencing a problem that I'm trying to intercept the time series function. I was interested when I noticed that open solaris is using a special fasttrap for fastening time retrieve.
The interesting part in my code is:
------------------ snip -------------------
static void (*old_gethrestimef)(timestruc_t *) = NULL;
static hrtime_t (*old_gethrtimef)(void) = NULL;
extern void (*gethrestimef)(timestruc_t *);
extern hrtime_t (*gethrtimef)(void);
static void dummy_gethrestime(timestruc_t *ts)
{
cmn_err(CE_WARN, "gethrestime called\n");
old_gethrestimef(ts);
}
static hrtime_t dummy_gethrtime(void)
{
cmn_err(CE_WARN, "gethrtime called\n");
return old_gethrtimef();
}
/* Device configuration entry points */
static int
dummy_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
{
cmn_err(CE_NOTE, "Inside dummy_attach");
switch(cmd) {
case DDI_ATTACH:
dummy_dip = dip;
if (ddi_create_minor_node(dip, "0", S_IFCHR,
ddi_get_instance(dip), DDI_PSEUDO,0)
!= DDI_SUCCESS) {
cmn_err(CE_NOTE,
"%s%d: attach: could not add character node.",
"dummy", 0);
return(DDI_FAILURE);
} else {
/* Here intercepting the time functions */
old_gethrestimef = gethrestimef;
gethrestimef = dummy_gethrestime;
old_gethrtimef = gethrtimef;
gethrtimef = dummy_gethrtime;
return DDI_SUCCESS;
}
default:
return DDI_FAILURE;
}
}
---------- snip ------------------
The complete module source file is in the attachment.
After I loaded the module with `add_drv dummy', the kernel frozen. After some
analysis, I found that if I only intercept gethrestimef only, everything is ok.
I'm running opensolaris snv_117 on a amd64 box.
Please help, I have stuck on this problem for a long time.
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