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From ba62b58974fd25f7281fa151411c8e32b3951fbb Mon Sep 17 00:00:00 2001
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From: Serhei Makarov <smakarov@redhat.com>
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Date: Fri, 2 Nov 2018 12:22:01 -0400
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Subject: [PATCH 18/32] tapset/bpf/task.stp :: rudiment of task tapset
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---
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tapset/bpf/task.stp | 20 ++++++++++++++++++++
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testsuite/systemtap.bpf/bpf_tests/task1.stp | 15 +++++++++++++++
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2 files changed, 35 insertions(+)
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create mode 100644 tapset/bpf/task.stp
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create mode 100644 testsuite/systemtap.bpf/bpf_tests/task1.stp
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diff --git a/tapset/bpf/task.stp b/tapset/bpf/task.stp
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new file mode 100644
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index 000000000..9f558a166
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--- /dev/null
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+++ b/tapset/bpf/task.stp
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@@ -0,0 +1,20 @@
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+// task information tapset
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+// Copyright (C) 2018 Red Hat Inc.
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+//
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+// This file is part of systemtap, and is free software. You can
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+// redistribute it and/or modify it under the terms of the GNU General
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+// Public License (GPL); either version 2, or (at your option) any
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+// later version.
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+
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+@__private30 function _task_cur:long()
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+%{ /* bpf */ /* pure */
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+ call, $$, get_current_task;
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+%}
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+
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+/**
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+ * sfunction task_current - The current task_struct of the current task
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+ */
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+function task_current:long () {
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+ // TODO: return & @task(_task_cur())
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+ return & @cast(_task_cur(), "task_struct")
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+}
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diff --git a/testsuite/systemtap.bpf/bpf_tests/task1.stp b/testsuite/systemtap.bpf/bpf_tests/task1.stp
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new file mode 100644
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index 000000000..b0faab361
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--- /dev/null
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+++ b/testsuite/systemtap.bpf/bpf_tests/task1.stp
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@@ -0,0 +1,15 @@
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+probe begin {
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+ printf("BEGIN\n")
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+}
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+
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+probe kernel.function("vfs_read") {
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+ // TODO: PR23816, task.stp tapset
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+ printf("vfs_read by %s", execname())
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+ printf("/%s", kernel_string(@cast(task_current(), "task_struct")->comm))
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+ printf(" PID %d/%d\n", pid(), @cast(task_current(), "task_struct")->tgid)
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+ exit()
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+}
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+
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+probe end {
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+ printf("END PASS\n")
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+}
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--
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2.14.5
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