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/*
* Oracle Linux DTrace.
* Copyright (c) 2006, 2026, Oracle and/or its affiliates. All rights reserved.
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
#include <sys/types.h>
#include <sys/bitmap.h>
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <alloca.h>
#include <unistd.h>
#include <errno.h>
#include <port.h>
#include <dt_provider.h>
#include <dt_probe.h>
#include <dt_module.h>
#include <dt_string.h>
#include <dt_list.h>
/*
* List of provider modules that register providers and probes. A single
* provider module may create multiple providers.
*/
const dt_provimpl_t *dt_providers[] = {
&dt_dtrace, /* list dt_dtrace first */
&dt_cpc,
&dt_fbt,
&dt_io,
&dt_ip,
&dt_lockstat,
&dt_proc,
&dt_profile,
&dt_rawtp,
&dt_sched,
&dt_sdt,
&dt_syscall,
&dt_tcp,
&dt_udp,
&dt_uprobe,
&dt_usdt,
NULL
};
static uint32_t
dt_provider_hval(const dt_provider_t *pvp)
{
return str2hval(pvp->desc.dtvd_name, 0);
}
static int
dt_provider_cmp(const dt_provider_t *p,
const dt_provider_t *q)
{
return strcmp(p->desc.dtvd_name, q->desc.dtvd_name);
}
DEFINE_HE_STD_LINK_FUNCS(dt_provider, dt_provider_t, he)
static void *
dt_provider_del_prov(dt_provider_t *head, dt_provider_t *pvp)
{
head = dt_provider_del(head, pvp);
if (pvp->pv_probes != NULL)
dt_idhash_destroy(pvp->pv_probes);
if (pvp->impl && pvp->impl->destroy)
pvp->impl->destroy(pvp->pv_hdl, pvp->prv_data);
dt_node_link_free(&pvp->pv_nodes);
free(pvp->pv_xrefs);
free(pvp);
return head;
}
static dt_htab_ops_t dt_provider_htab_ops = {
.hval = (htab_hval_fn)dt_provider_hval,
.cmp = (htab_cmp_fn)dt_provider_cmp,
.add = (htab_add_fn)dt_provider_add,
.del = (htab_del_fn)dt_provider_del_prov,
.next = (htab_next_fn)dt_provider_next
};
static dt_provider_t *
dt_provider_insert(dtrace_hdl_t *dtp, dt_provider_t *pvp)
{
if (!dtp->dt_provs) {
dtp->dt_provs = dt_htab_create(&dt_provider_htab_ops);
if (dtp->dt_provs == NULL)
return NULL;
}
if (dt_htab_insert(dtp->dt_provs, pvp) < 0) {
free(pvp);
return NULL;
}
return pvp;
}
dt_provider_t *
dt_provider_lookup(dtrace_hdl_t *dtp, const char *name)
{
dt_provider_t tmpl;
if (dtp->dt_provs == NULL)
return NULL;
if ((strlen(name) + 1) > sizeof(tmpl.desc.dtvd_name))
return NULL;
strcpy(tmpl.desc.dtvd_name, name);
return dt_htab_lookup(dtp->dt_provs, &tmpl);
}
dt_provider_t *
dt_provider_create(dtrace_hdl_t *dtp, const char *name,
const dt_provimpl_t *impl, const dtrace_pattr_t *pattr,
void *datap)
{
dt_provider_t *pvp;
pvp = dt_provider_lookup(dtp, name);
if (pvp)
return pvp;
if ((pvp = dt_zalloc(dtp, sizeof(dt_provider_t))) == NULL)
goto nomem;
strlcpy(pvp->desc.dtvd_name, name, DTRACE_PROVNAMELEN);
pvp->impl = impl;
pvp->pv_probes = dt_idhash_create(pvp->desc.dtvd_name, NULL, 0, 0);
pvp->pv_gen = dtp->dt_gen;
pvp->pv_hdl = dtp;
pvp->prv_data = datap;
dt_dprintf("creating provider %s\n", name);
if (pvp->pv_probes == NULL)
goto nomem;
memcpy(&pvp->desc.dtvd_attr, pattr, sizeof(dtrace_pattr_t));
return dt_provider_insert(dtp, pvp);
nomem:
if (pvp)
dt_free(dtp, pvp);
dt_set_errno(dtp, EDT_NOMEM);
return NULL;
}
int
dt_provider_xref(dtrace_hdl_t *dtp, dt_provider_t *pvp, id_t id)
{
size_t oldsize = BT_SIZEOFMAP(pvp->pv_xrmax);
size_t newsize = BT_SIZEOFMAP(dtp->dt_xlatorid);
assert(id >= 0 && id < dtp->dt_xlatorid);
if (newsize > oldsize) {
ulong_t *xrefs = dt_zalloc(dtp, newsize);
if (xrefs == NULL)
return -1;
memcpy(xrefs, pvp->pv_xrefs, oldsize);
dt_free(dtp, pvp->pv_xrefs);
pvp->pv_xrefs = xrefs;
pvp->pv_xrmax = dtp->dt_xlatorid;
}
BT_SET(pvp->pv_xrefs, id);
return 0;
}
int
dt_provider_discover(dtrace_hdl_t *dtp)
{
int prid = dtp->dt_probe_id;
dt_htab_next_t *it = NULL;
dt_provider_t *pvp;
/* Discover new probes. */
while ((pvp = dt_htab_next(dtp->dt_provs, &it)) != NULL) {
if (pvp->impl->discover && pvp->impl->discover(dtp) < 0)
return -1; /* errno is already set */
}
/* Add them. */
for ( ; prid < dtp->dt_probe_id; prid++) {
dt_probe_t *prp = dtp->dt_probes[prid];
int rc;
dt_probe_enable(dtp, prp);
if (prp->prov->impl->add_probe == NULL)
continue;
rc = prp->prov->impl->add_probe(dtp, prp);
if (rc < 0)
return rc;
}
return 0;
}
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