commit eb1b70daa801c34e07c64c8b143cd899eb5ecbae
author Brendan Gregg <brendan.d.gregg@gmail.com> Mon Jul 25 16:13:35 2016 -0700
committer Brendan Gregg <brendan.d.gregg@gmail.com> Mon Jul 25 16:13:35 2016 -0700
tree c04513981422c518077b640130d548e292403b22
parent 239e86378f9d3c63595296b64c8253fc5c37d299

fix uprobe examples to read correct argument

examples/tracing/strlen_count.py

diff --git a/examples/tracing/strlen_count.py b/examples/tracing/strlen_count.py
index dfc98d3..7d2db89 100755
--- a/examples/tracing/strlen_count.py
+++ b/examples/tracing/strlen_count.py
@@ -24,13 +24,13 @@
 BPF_HASH(counts, struct key_t);
 
 int count(struct pt_regs *ctx) {
-    if (!PT_REGS_PARM2(ctx))
+    if (!PT_REGS_PARM1(ctx))
         return 0;
 
     struct key_t key = {};
     u64 zero = 0, *val;
 
-    bpf_probe_read(&key.c, sizeof(key.c), (void *)PT_REGS_PARM2(ctx));
+    bpf_probe_read(&key.c, sizeof(key.c), (void *)PT_REGS_PARM1(ctx));
     val = counts.lookup_or_init(&key, &zero);
     (*val)++;
     return 0;