2007-12-05 Masami Hiramatsu <mhiramat@redhat.com>

	PR 4935
	* tapsets.cxx (dwarf_derived_probe::dwarf_derived_probe): Allow user
	to access kernel variables in the condition of probe points.
	* stapprobes.5.in : Document the conditional probe point.
	* NEWS : Ditto.
	* parseok/five.stp: Add an example of conditional probe point.
	* parseko/probepoint04.stp: New test for conditional probe point.
	* parseko/probepoint05.stp: Ditto.
	* parseko/probepoint06.stp: Ditto.
	* parseko/probepoint07.stp: Ditto.
	* parseko/probepoint08.stp: Ditto.
	* parseko/probepoint09.stp: Ditto.
	* semok/twentynine.stp: Ditto.
	* semko/thirtynine.stp: Ditto.
	* systemtap.base/onoffprobe.*: Ditto.

2 files changed, 92 insertions, 0 deletions

diff --git a/testsuite/systemtap.base/onoffprobe.exp b/testsuite/systemtap.base/onoffprobe.exp
new file mode 100644
index 00000000..41e107d7
--- /dev/null
+++ b/testsuite/systemtap.base/onoffprobe.exp
@@ -0,0 +1,57 @@
+set test "onoffprobe"
+if {![installtest_p]} { untested $test; return }
+
+spawn stap $srcdir/$subdir/$test.stp -m $test
+set pid $spawn_id
+set ok 0
+expect {
+  -timeout 240
+  "begin probed\r\n" {
+	if {$ok == 0} {
+		incr ok
+		pass "conditional begin probe"
+		exec echo 1 > /proc/systemtap/$test/switch
+		exec echo "dummy" > /dev/null
+		exp_continue;
+	}
+  }
+  "function return probed\r\n" {
+	if {$ok == 1} {
+		incr ok
+		pass "conditional dwarf probe (return)"
+		exec echo 2 > /proc/systemtap/$test/switch
+		exec echo "dummy" > /dev/null
+		exp_continue;
+	}
+  }
+  "function entry probed\r\n" {
+	if {$ok == 2} {
+		incr ok
+		pass "conditional dwarf probe (entry)"
+		exec echo 3 > /proc/systemtap/$test/switch
+		exp_continue;
+	}
+  }
+  "timer probed\r\n" {
+	if {$ok == 3} {
+		incr ok
+		pass "conditional timer probe"
+		exec echo 4 > /proc/systemtap/$test/switch
+		exp_continue;
+	}
+  }
+  "profile probed\r\n" {
+	if {$ok == 4} {
+		incr ok
+		pass "conditional profile probe"
+	}
+  }
+   timeout { fail "$test (timeout)" }
+    eof { }
+}
+send "\003"
+#FIXME does not handle case of hanging pfaults.stp correctly
+wait
+exec rm -f $test.ko
+if {$ok != 5} {fail "conditional probes ($ok)"}
+
diff --git a/testsuite/systemtap.base/onoffprobe.stp b/testsuite/systemtap.base/onoffprobe.stp
new file mode 100644
index 00000000..11968540
--- /dev/null
+++ b/testsuite/systemtap.base/onoffprobe.stp
@@ -0,0 +1,35 @@
+global switch=0
+
+#begin probe
+probe begin if (switch==0) {
+	log("begin probed\n");
+}
+
+#dwarf probe (return)
+probe kernel.function("sys_write").return if (switch == 1) {
+	log("function return probed\n")
+	switch = 0
+}
+
+#dwarf probe (entry)
+probe kernel.function("sys_write") if (switch == 2) {
+	log("function entry probed\n")
+	switch = 0
+}
+
+#timer probe
+probe timer.s(1) if (switch == 3) {
+	log("timer probed\n")
+	switch = 0
+}
+
+#profile probe
+probe timer.profile if (switch == 4) {
+	log("profile probed\n")
+	switch = 0
+}
+
+probe procfs("switch").write {
+	switch = strtol($value, 10)
+}
+