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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 (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
*/
/*
* Subscription event access interfaces.
*/
#include <sys/types.h>
#include <pthread.h>
#include <umem.h>
#include <fm/libfmevent.h>
#include "fmev_impl.h"
static pthread_key_t fmev_tsdkey = PTHREAD_ONCE_KEY_NP;
static int key_inited;
/*
* Thread and handle specific data.
*/
struct fmev_tsd {
fmev_err_t ts_lasterr;
};
static void
fmev_tsd_destructor(void *data)
{
umem_free(data, sizeof (struct fmev_tsd));
}
/*
* Called only from fmev_shdl_init. Check we are opening a valid version
* of the ABI.
*/
int
fmev_api_init(struct fmev_hdl_cmn *hc)
{
uint32_t v = hc->hc_api_vers;
int rc;
if (!fmev_api_enter((struct fmev_hdl_cmn *)fmev_api_init, 0))
return (0);
switch (v) {
case LIBFMEVENT_VERSION_1:
case LIBFMEVENT_VERSION_2:
rc = 1;
break;
default:
if (key_inited)
(void) fmev_seterr(FMEVERR_VERSION_MISMATCH);
rc = 0;
break;
}
return (rc);
}
/*
* On entry to other libfmevent API members we call fmev_api_enter.
* Some thread-specific data is used to keep a per-thread error value.
* The version opened must be no greater than the latest version but can
* be older. The ver_intro is the api version at which the interface
* was added - the caller must have opened at least this version.
*/
int
fmev_api_enter(struct fmev_hdl_cmn *hc, uint32_t ver_intro)
{
uint32_t v;
struct fmev_tsd *tsd;
/* Initialize key on first visit */
if (!key_inited) {
(void) pthread_key_create_once_np(&fmev_tsdkey,
fmev_tsd_destructor);
key_inited = 1;
}
/*
* Allocate TSD for error value for this thread. It is only
* freed if/when the thread exits.
*/
if ((tsd = pthread_getspecific(fmev_tsdkey)) == NULL) {
if ((tsd = umem_alloc(sizeof (*tsd), UMEM_DEFAULT)) == NULL ||
pthread_setspecific(fmev_tsdkey, (const void *)tsd) != 0) {
if (tsd)
umem_free(tsd, sizeof (*tsd));
return (0); /* no error set, but what can we do */
}
}
tsd->ts_lasterr = 0;
if (hc == (struct fmev_hdl_cmn *)fmev_api_init)
return (1); /* special case from fmev_api_init only */
if (hc == NULL || hc->hc_magic != _FMEV_SHMAGIC) {
tsd->ts_lasterr = FMEVERR_API;
return (0);
}
v = hc->hc_api_vers; /* API version opened */
/* Enforce version adherence. */
if (ver_intro > v || v > LIBFMEVENT_VERSION_LATEST ||
ver_intro > LIBFMEVENT_VERSION_LATEST) {
tsd->ts_lasterr = FMEVERR_VERSION_MISMATCH;
return (0);
}
return (1);
}
/*
* Called on any fmev_shdl_fini. Free the TSD for this thread. If this
* thread makes other API calls for other open handles, or opens a new
* handle, then TSD will be allocated again in fmev_api_enter.
*/
void
fmev_api_freetsd(void)
{
struct fmev_tsd *tsd;
if ((tsd = pthread_getspecific(fmev_tsdkey)) != NULL) {
(void) pthread_setspecific(fmev_tsdkey, NULL);
fmev_tsd_destructor((void *)tsd);
}
}
/*
* To return an error condition an API member first sets the error type
* with a call to fmev_seterr and then returns NULL or whatever it wants.
* The caller can then retrieve the per-thread error type using fmev_errno
* or format it with fmev_strerr.
*/
fmev_err_t
fmev_seterr(fmev_err_t error)
{
struct fmev_tsd *tsd;
ASSERT(key_inited);
if ((tsd = pthread_getspecific(fmev_tsdkey)) != NULL)
tsd->ts_lasterr = error;
return (error);
}
/*
* fmev_errno is a macro defined in terms of the following function. It
* can be used to dereference the last error value on the current thread;
* it must not be used to assign to fmev_errno.
*/
const fmev_err_t apierr = FMEVERR_API;
const fmev_err_t unknownerr = FMEVERR_UNKNOWN;
const fmev_err_t *
__fmev_errno(void)
{
struct fmev_tsd *tsd;
if (!key_inited)
return (&apierr);
if ((tsd = pthread_getspecific(fmev_tsdkey)) == NULL)
return (&unknownerr);
return ((const fmev_err_t *)&tsd->ts_lasterr);
}
void *
dflt_alloc(size_t sz)
{
return (umem_alloc(sz, UMEM_DEFAULT));
}
void *
dflt_zalloc(size_t sz)
{
return (umem_zalloc(sz, UMEM_DEFAULT));
}
void
dflt_free(void *buf, size_t sz)
{
umem_free(buf, sz);
}
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