1 files changed, 75 insertions, 0 deletions
diff --git a/runtime/probes/bench/bench_ret.c b/runtime/probes/bench/bench_ret.c
new file mode 100644
index 00000000..9444626c
--- /dev/null
+++ b/runtime/probes/bench/bench_ret.c
@@ -0,0 +1,75 @@
+#define STP_NETLINK_ONLY
+#define STP_NUM_STRINGS 1
+#define USE_RET_PROBES
+
+#include "runtime.h"
+#include "probes.c"
+
+MODULE_DESCRIPTION("SystemTap probe: bench_ret");
+MODULE_AUTHOR("Martin Hunt");
+
+int entries = 0;
+int returns = 0;
+
+static int inst_sys_read (struct kprobe *p, struct pt_regs *regs)
+{
+  return 0;
+}
+
+static int inst_sys_write_ret (struct kprobe *p, struct pt_regs *regs)
+{
+  returns++;
+  return 0;
+}
+
+static int inst_sys_write (struct kprobe *p, struct pt_regs *regs)
+{
+  entries++;
+  return 0;
+}
+
+static struct kretprobe kpr[] = {
+  {
+    .kp.addr = "sys_read",
+    .handler = inst_sys_read
+  },
+  {
+    .kp.addr = "sys_write",
+    .handler = inst_sys_write_ret
+  }
+};
+
+static struct kprobe kp[] = {
+  {
+    .addr = "sys_write",
+    .pre_handler = inst_sys_write
+  }
+};
+
+
+#define NUM_KPROBES (sizeof(kpr)/sizeof(struct kretprobe))
+
+int init_module(void)
+{
+  int ret;
+
+  TRANSPORT_OPEN;
+  
+  ret = _stp_register_kretprobes (kpr, NUM_KPROBES);
+  ret = _stp_register_kprobes (kp, 1);
+  return ret;
+}
+
+static void probe_exit (void)
+{
+  _stp_unregister_kretprobes (kpr, NUM_KPROBES); 
+  _stp_unregister_kprobes (kp, 1); 
+  printk("entries=%d returns=%d\n", entries, returns);
+}
+
+void cleanup_module(void)
+{
+  _stp_transport_close();
+}
+
+MODULE_LICENSE("GPL");