From ba62b58974fd25f7281fa151411c8e32b3951fbb Mon Sep 17 00:00:00 2001
From: Serhei Makarov <smakarov@redhat.com>
Date: Fri, 2 Nov 2018 12:22:01 -0400
Subject: [PATCH 18/32] tapset/bpf/task.stp :: rudiment of task tapset

---
 tapset/bpf/task.stp                         | 20 ++++++++++++++++++++
 testsuite/systemtap.bpf/bpf_tests/task1.stp | 15 +++++++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 tapset/bpf/task.stp
 create mode 100644 testsuite/systemtap.bpf/bpf_tests/task1.stp

diff --git a/tapset/bpf/task.stp b/tapset/bpf/task.stp
new file mode 100644
index 000000000..9f558a166
--- /dev/null
+++ b/tapset/bpf/task.stp
@@ -0,0 +1,20 @@
+// task information tapset
+// Copyright (C) 2018 Red Hat Inc.
+//
+// This file is part of systemtap, and is free software.  You can
+// redistribute it and/or modify it under the terms of the GNU General
+// Public License (GPL); either version 2, or (at your option) any
+// later version.
+
+@__private30 function _task_cur:long()
+%{ /* bpf */ /* pure */
+  call, $$, get_current_task;
+%}
+
+/**
+ * sfunction task_current - The current task_struct of the current task
+ */
+function task_current:long () {
+  // TODO: return & @task(_task_cur())
+  return & @cast(_task_cur(), "task_struct")
+}
diff --git a/testsuite/systemtap.bpf/bpf_tests/task1.stp b/testsuite/systemtap.bpf/bpf_tests/task1.stp
new file mode 100644
index 000000000..b0faab361
--- /dev/null
+++ b/testsuite/systemtap.bpf/bpf_tests/task1.stp
@@ -0,0 +1,15 @@
+probe begin {
+	printf("BEGIN\n")
+}
+
+probe kernel.function("vfs_read") {
+	// TODO: PR23816, task.stp tapset
+	printf("vfs_read by %s", execname())
+	printf("/%s", kernel_string(@cast(task_current(), "task_struct")->comm))
+	printf(" PID %d/%d\n", pid(), @cast(task_current(), "task_struct")->tgid)
+	exit()
+}
+
+probe end {
+	printf("END PASS\n")
+}
-- 
2.14.5