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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <errno.h>
#include <kstat.h>
#include <signal.h>
#include <setjmp.h>
#include "sdbc_stats.h"
#include "report.h"
#include "common.h"
static sigjmp_buf env;
static sig_atomic_t sig_raised = 0;
static void sig_handler(int);
void
sig_handler(int sig)
{
switch (sig) {
case SIGSEGV:
sig_raised = 1;
siglongjmp(env, sig);
default:
exit(sig);
}
}
/*
* kstat_retrieve() - populate the ks_data field of the kstat_t structure
*
* This function is a user-land equivalent of a ks_snapshot
*
* parameters
* kstat_ctl_t *kc - kstat_ctl_t structure representing returned from
* kstat_open()
* kstat_t *ksp - kstat_t strcture to popluate ks_data into
*
* returns
* NULL pointer on failure
* kstat_t * structure on success
*/
kstat_t *
kstat_retrieve(kstat_ctl_t *kc, kstat_t *ksp)
{
kstat_t *rval;
kstat_named_t *knp;
char *end;
int i;
struct sigaction segv_act; /* default actions */
if (ksp == NULL)
return (NULL);
if (ksp->ks_data == NULL &&
kstat_read(kc, ksp, NULL) == -1)
return (NULL);
rval = (kstat_t *)calloc(1, sizeof (*ksp));
(void) memcpy(rval, ksp, sizeof (*ksp));
rval->ks_data = (void *) calloc(1, ksp->ks_data_size);
(void) memcpy(rval->ks_data, ksp->ks_data,
sizeof (kstat_named_t) * ksp->ks_ndata);
/* special handling for variable length string KSTAT_DATA_STRING */
knp = (kstat_named_t *)rval->ks_data;
end = (char *)(knp + ksp->ks_ndata);
for (i = 0; i < ksp->ks_ndata; i++, knp++) {
if (knp->data_type == KSTAT_DATA_STRING &&
KSTAT_NAMED_STR_PTR(knp) != NULL) {
/* catch SIGSEGV (bug 6384130) */
sig_raised = 0;
(void) sigaction(SIGSEGV, NULL, &segv_act);
(void) signal(SIGSEGV, sig_handler);
(void) strncpy(end, KSTAT_NAMED_STR_PTR(knp),
KSTAT_NAMED_STR_BUFLEN(knp));
KSTAT_NAMED_STR_PTR(knp) = end;
end += KSTAT_NAMED_STR_BUFLEN(knp);
/* bug 6384130 */
(void) sigsetjmp(env, 0);
if (sig_raised) {
bzero(end, KSTAT_NAMED_STR_BUFLEN(knp));
KSTAT_NAMED_STR_PTR(knp) = end;
end += KSTAT_NAMED_STR_BUFLEN(knp);
}
(void) sigaction(SIGSEGV, &segv_act, NULL);
}
}
return (rval);
}
/*
* kstat_value() - retrieve value of a field in a kstat_named_t kstat.
*
* parameters
* kstat_t *ksp - kstat containing the field
* char *name - text string representing the field name
*
* returns
* void * - pointer to data retrieved
*/
void *
kstat_value(kstat_t *ksp, char *name)
{
kstat_named_t *knm;
if ((knm = kstat_data_lookup(ksp, name)) == NULL)
return (NULL);
switch (knm->data_type) {
case KSTAT_DATA_CHAR :
return (knm->value.c);
case KSTAT_DATA_INT32 :
return (&knm->value.i32);
case KSTAT_DATA_UINT32 :
return (&knm->value.ui32);
case KSTAT_DATA_INT64 :
return (&knm->value.i64);
case KSTAT_DATA_UINT64 :
return (&knm->value.ui64);
case KSTAT_DATA_STRING :
return (KSTAT_NAMED_STR_PTR(knm));
}
return (NULL);
}
/*
* kstat_free() - deallocated memory associated with a kstat
*
* paramters
* kstat_t ksp - kstat to be deallocated
*
* returns
* void
*/
void
kstat_free(kstat_t *ksp)
{
if (ksp != NULL) {
if (ksp->ks_data != NULL)
free(ksp->ks_data);
free(ksp);
}
}
uint32_t
kstat_delta(kstat_t *pksp, kstat_t *cksp, char *name)
{
uint32_t *pv, *cv;
pv = kstat_value(pksp, name);
cv = kstat_value(cksp, name);
return (u32_delta(*pv, *cv));
}
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