[DTrace-devel] [PATCH 4/5] Add ability to provide user-specified probes on demand
eugene.loh at oracle.com
eugene.loh at oracle.com
Thu Jun 11 14:29:40 PDT 2020
From: Eugene Loh <eugene.loh at oracle.com>
Signed-off-by: Eugene Loh <eugene.loh at oracle.com>
---
libdtrace/dt_probe.c | 20 ++++++++++++++++++++
libdtrace/dt_provider.h | 2 ++
2 files changed, 22 insertions(+)
diff --git a/libdtrace/dt_probe.c b/libdtrace/dt_probe.c
index 7fa6c341..2066096a 100644
--- a/libdtrace/dt_probe.c
+++ b/libdtrace/dt_probe.c
@@ -1149,6 +1149,26 @@ dt_probe_iter(dtrace_hdl_t *dtp, const dtrace_probedesc_t *pdp,
tmpl.desc = pdp;
+ /*
+ * Special case: if the probe name is specified,
+ * give all providers the opportunity to provide it.
+ */
+ if (n_is_glob == 0) {
+ dt_provider_t *pvp;
+ dtrace_probedesc_t pd;
+
+ /* loop over providers */
+ for (pvp = dt_list_next(&dtp->dt_provlist);
+ pvp != NULL; pvp = dt_list_next(pvp)) {
+ if (pvp->impl->provide == NULL ||
+ !dt_gmatch(pvp->desc.dtvd_name, pdp->prv))
+ continue;
+ memcpy(&pd, pdp, sizeof (pd));
+ pd.prv = pvp->desc.dtvd_name;
+ pvp->impl->provide(dtp, &pd);
+ }
+ }
+
/*
* Special case: if the probe is fully specified (none of the elements
* are empty of a glob pattern, we can do a direct lookup based on the
diff --git a/libdtrace/dt_provider.h b/libdtrace/dt_provider.h
index e98bfac1..50f663f1 100644
--- a/libdtrace/dt_provider.h
+++ b/libdtrace/dt_provider.h
@@ -62,6 +62,8 @@ typedef struct dt_provimpl {
int (*probe_info)(dtrace_hdl_t *dtp, /* get probe info */
const struct dt_probe *prp,
int *idp, int *argcp, dt_argdesc_t **argvp);
+ int (*provide)(dtrace_hdl_t *dtp, /* provide probes */
+ const dtrace_probedesc_t *pdp);
void (*trampoline)(dt_pcb_t *pcb); /* generate BPF trampoline */
int (*probe_fini)(dtrace_hdl_t *dtp, /* probe cleanup */
struct dt_probe *prb);
--
2.18.2
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