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/*
* Oracle Linux DTrace.
* Copyright (c) 2021, 2024, 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.
*
* Provider support code for tracepoint-based probes.
*/
#include <errno.h>
#include <ctype.h>
#include "dt_provider_sdt.h"
#include "dt_probe.h"
#include "dt_impl.h"
typedef struct sdt_data {
const probe_dep_t *probes;
const probe_arg_t *probe_args;
} sdt_data_t;
/*
* Create an SDT provider and populate it from the provided list of probes
* (with dependency information) and probe argument data.
*/
int
dt_sdt_populate(dtrace_hdl_t *dtp, const char *prvname, const char *modname,
const dt_provimpl_t *ops, const dtrace_pattr_t *pattr,
const probe_arg_t *probe_args, const probe_dep_t *probes)
{
dt_provider_t *prv;
const probe_arg_t *arg;
sdt_data_t *sdp;
int n = 0;
sdp = dt_alloc(dtp, sizeof(sdt_data_t));
if (sdp == NULL)
return dt_set_errno(dtp, EDT_NOMEM);
sdp->probes = probes;
sdp->probe_args = probe_args;
prv = dt_provider_create(dtp, prvname, ops, pattr, sdp);
if (prv == NULL)
return -1; /* errno already set */
/*
* Create SDT probes based on the probe_args list. Since each probe
* will have at least one entry (with argno == 0), we can use those
* entries to identify the probe names.
*/
for (arg = &probe_args[0]; arg->name != NULL; arg++) {
if (arg->argno == 0 &&
dt_probe_insert(dtp, prv, prvname, modname, "", arg->name,
NULL))
n++;
}
return n;
}
/*
* Add an SDT probe as a dependent probe for an underlying probe that has been
* provided by another provider.
*/
static int
add_dependency(dtrace_hdl_t *dtp, dt_probe_t *uprp, void *arg)
{
dt_probe_t *prp = arg;
dt_probe_add_dependent(dtp, uprp, prp);
dt_probe_enable(dtp, uprp);
return 0;
}
/*
* Enable an SDT probe.
*/
void
dt_sdt_enable(dtrace_hdl_t *dtp, dt_probe_t *prp)
{
const probe_dep_t *dep;
for (dep = ((sdt_data_t *)prp->prov->prv_data)->probes;
dep->name != NULL; dep++) {
dtrace_probedesc_t pd;
if (strcmp(prp->desc->prb, dep->name) != 0)
continue;
/*
* If the dependency specifies a minimum and/or maximum kernel
* version, skip this dependency if the runtime kernel version
* does not fall in the specified range.
*/
if (dep->kver_min && dtp->dt_kernver < dep->kver_min)
continue;
if (dep->kver_max && dtp->dt_kernver > dep->kver_max)
continue;
if (dtrace_str2desc(dtp, dep->spec, dep->str, &pd) == -1)
return;
dt_probe_iter(dtp, &pd, add_dependency, NULL, prp);
free((void *)pd.prv);
free((void *)pd.mod);
free((void *)pd.fun);
free((void *)pd.prb);
}
/*
* Finally, ensure we're in the list of enablings as well.
* (This ensures that, among other things, the probes map
* gains entries for us.)
*/
if (!dt_in_list(&dtp->dt_enablings, prp))
dt_list_append(&dtp->dt_enablings, prp);
}
/*
* Populate the probe arguments for the given probe.
*/
int
dt_sdt_probe_info(dtrace_hdl_t *dtp, const dt_probe_t *prp, int *argcp,
dt_argdesc_t **argvp)
{
int i;
int pidx = -1;
int argc = 0;
dt_argdesc_t *argv = NULL;
const probe_arg_t *probe_args =
((sdt_data_t *)prp->prov->prv_data)->probe_args;
const probe_arg_t *arg;
for (arg = &probe_args[i = 0]; arg->name != NULL; arg++, i++) {
if (strcmp(arg->name, prp->desc->prb) == 0) {
if (pidx == -1) {
pidx = i;
if (arg->argdesc.native == NULL)
break;
}
argc++;
}
}
if (argc == 0)
goto done;
argv = dt_zalloc(dtp, argc * sizeof(dt_argdesc_t));
if (!argv)
return -ENOMEM;
for (i = pidx; i < pidx + argc; i++) {
const probe_arg_t *arg = &probe_args[i];
const dt_argdesc_t *argd = &arg->argdesc;
dt_argdesc_t *parg = &argv[arg->argno];
*parg = *argd;
if (argd->native)
parg->native = strdup(argd->native);
if (argd->xlate)
parg->xlate = strdup(argd->xlate);
}
done:
*argcp = argc;
*argvp = argv;
return 0;
}
/*
* Clean up SDT-specific data.
*/
void
dt_sdt_destroy(dtrace_hdl_t *dtp, void *datap)
{
dt_free(dtp, datap);
}
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