[PATCH 07/22] Supply a default probe_info()

[eugene.loh@oracle.com]

From: Eugene Loh <eugene.loh@oracle.com>

Signed-off-by: Eugene Loh <eugene.loh@oracle.com>
---
 libdtrace/dt_probe.c        |  4 +++-
 libdtrace/dt_prov_cpc.c     | 11 -----------
 libdtrace/dt_prov_dtrace.c  | 10 ----------
 libdtrace/dt_prov_fbt.c     | 10 ----------
 libdtrace/dt_prov_profile.c | 11 -----------
 5 files changed, 3 insertions(+), 43 deletions(-)

diff --git a/libdtrace/dt_probe.c b/libdtrace/dt_probe.c
index 0b53121a..ab90d2ed 100644
--- a/libdtrace/dt_probe.c
+++ b/libdtrace/dt_probe.c
@@ -892,8 +892,10 @@ dt_probe_args_info(dtrace_hdl_t *dtp, dt_probe_t *prp)
 	/* Only retrieve probe argument information once per probe. */
 	if (prp->argc != -1)
 		return 0;
-	if (!prp->prov->impl->probe_info)
+	if (!prp->prov->impl->probe_info) {
+		prp->argc = 0;
 		return 0;
+	}
 	rc = prp->prov->impl->probe_info(dtp, prp, &argc, &argv);
 	if (rc == -1)
 		return rc;
diff --git a/libdtrace/dt_prov_cpc.c b/libdtrace/dt_prov_cpc.c
index 08689b35..8f33cf58 100644
--- a/libdtrace/dt_prov_cpc.c
+++ b/libdtrace/dt_prov_cpc.c
@@ -451,16 +451,6 @@ static int attach(dtrace_hdl_t *dtp, const dt_probe_t *prp, int bpf_fd)
 	return nattach > 0 ? 0 : -1;
 }
 
-static int probe_info(dtrace_hdl_t *dtp, const dt_probe_t *prp,
-		      int *argcp, dt_argdesc_t **argvp)
-{
-	/* cpc-provider probe arguments are not typed */
-	*argcp = 0;
-	*argvp = NULL;
-
-	return 0;
-}
-
 static void detach(dtrace_hdl_t *dtp, const dt_probe_t *prp)
 {
 	cpc_probe_t	*datap = prp->prv_data;
@@ -504,7 +494,6 @@ dt_provimpl_t	dt_cpc = {
 	.load_prog	= &dt_bpf_prog_load,
 	.trampoline	= &trampoline,
 	.attach		= &attach,
-	.probe_info	= &probe_info,
 	.detach		= &detach,
 	.probe_destroy	= &probe_destroy,
 	.destroy	= &destroy,
diff --git a/libdtrace/dt_prov_dtrace.c b/libdtrace/dt_prov_dtrace.c
index bf87cb05..a9deccee 100644
--- a/libdtrace/dt_prov_dtrace.c
+++ b/libdtrace/dt_prov_dtrace.c
@@ -273,15 +273,6 @@ static int attach(dtrace_hdl_t *dtp, const dt_probe_t *prp, int bpf_fd)
 	return dt_tp_probe_attach(dtp, prp, bpf_fd);
 }
 
-static int probe_info(dtrace_hdl_t *dtp, const dt_probe_t *prp,
-		      int *argcp, dt_argdesc_t **argvp)
-{
-	*argcp = 0;			/* no arguments */
-	*argvp = NULL;
-
-	return 0;
-}
-
 /*
  * Try to clean up system resources that may have been allocated for this
  * probe.
@@ -317,7 +308,6 @@ dt_provimpl_t	dt_dtrace = {
 	.trampoline	= &trampoline,
 	.load_prog	= &dt_bpf_prog_load,
 	.attach		= &attach,
-	.probe_info	= &probe_info,
 	.detach		= &detach,
 	.probe_destroy	= &dt_tp_probe_destroy,
 };
diff --git a/libdtrace/dt_prov_fbt.c b/libdtrace/dt_prov_fbt.c
index 62c568ce..21f63ddf 100644
--- a/libdtrace/dt_prov_fbt.c
+++ b/libdtrace/dt_prov_fbt.c
@@ -411,15 +411,6 @@ static int kprobe_attach(dtrace_hdl_t *dtp, const dt_probe_t *prp, int bpf_fd)
 	return dt_tp_probe_attach(dtp, prp, bpf_fd);
 }
 
-static int kprobe_probe_info(dtrace_hdl_t *dtp, const dt_probe_t *prp,
-			     int *argcp, dt_argdesc_t **argvp)
-{
-	*argcp = 0;			/* no arguments by default */
-	*argvp = NULL;
-
-	return 0;
-}
-
 /*
  * Try to clean up system resources that may have been allocated for this
  * probe.
@@ -469,7 +460,6 @@ dt_provimpl_t	dt_fbt_kprobe = {
 	.load_prog	= &dt_bpf_prog_load,
 	.trampoline	= &kprobe_trampoline,
 	.attach		= &kprobe_attach,
-	.probe_info	= &kprobe_probe_info,
 	.detach		= &kprobe_detach,
 	.probe_destroy	= &dt_tp_probe_destroy,
 };
diff --git a/libdtrace/dt_prov_profile.c b/libdtrace/dt_prov_profile.c
index bc224348..e1369ca9 100644
--- a/libdtrace/dt_prov_profile.c
+++ b/libdtrace/dt_prov_profile.c
@@ -299,16 +299,6 @@ static int attach(dtrace_hdl_t *dtp, const dt_probe_t *prp, int bpf_fd)
 	return nattach > 0 ? 0 : -1;
 }
 
-static int probe_info(dtrace_hdl_t *dtp, const dt_probe_t *prp,
-		      int *argcp, dt_argdesc_t **argvp)
-{
-	/* profile-provider probe arguments are not typed */
-	*argcp = 0;
-	*argvp = NULL;
-
-	return 0;
-}
-
 static void detach(dtrace_hdl_t *dtp, const dt_probe_t *prp)
 {
 	profile_probe_t	*pp = prp->prv_data;
@@ -337,7 +327,6 @@ dt_provimpl_t	dt_profile = {
 	.load_prog	= &dt_bpf_prog_load,
 	.trampoline	= &trampoline,
 	.attach		= &attach,
-	.probe_info	= &probe_info,
 	.detach		= &detach,
 	.probe_destroy	= &probe_destroy,
 };
-- 
2.43.5