[DTrace-devel] [PATCH 20/38] Add a hook for a provider-specific "update" function
eugene.loh at oracle.com
eugene.loh at oracle.com
Thu Jun 27 05:38:46 UTC 2024
From: Eugene Loh <eugene.loh at oracle.com>
For up-coming USDT-probe support, we need to update a BPF map
-- at least when the dtrace session starts but possibly also later
to support systemwide USDT tracing for processes that may start up
later.
One way to do this is with a USDT-specific update function.
For now, let's add a hook for providers to have provider-specific
update functions. User space can either call
for (i = 0; i < ARRAY_SIZE(dt_providers); i++) {
if (dt_providers[i]->update)
dt_providers[i]->update(...);
}
any time it likes. Or it can call dt_usdt.update(...).
This is for WIP. A different approach can be adopted later instead.
Signed-off-by: Eugene Loh <eugene.loh at oracle.com>
---
libdtrace/dt_provider.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/libdtrace/dt_provider.h b/libdtrace/dt_provider.h
index b1b1b1b8..71b5a3c4 100644
--- a/libdtrace/dt_provider.h
+++ b/libdtrace/dt_provider.h
@@ -71,6 +71,8 @@ typedef struct dt_provimpl {
void *datap);
void (*destroy)(dtrace_hdl_t *dtp, /* free provider data */
void *datap);
+ void (*update)(dtrace_hdl_t *dtp, /* update provider-specific info */
+ void *datap);
} dt_provimpl_t;
/* list dt_dtrace first */
--
2.18.4
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