linux-kernel - [GIT PULL] ftracetest: Use proper logic to find process PID

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Date:	Mon, 23 May 2016 14:20:25 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT PULL] ftracetest: Use proper logic to find process PID


Linus,

Reviewing the selftest I recently submitted, I realize that the second part
of it uses my old hack to get the PID of the spawned background tasks,
which doesn't work for all shells, instead of the common use of $!.


Please pull the latest trace-v4.7-3 tree, which can be found at:


  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
trace-v4.7-3

Tag SHA1: 773c674f8cf1e96253bef9889e5e26f0f3e8dcbb
Head SHA1: 97f8827a8c7963756ae7d3ee898675b4667eca73


Steven Rostedt (Red Hat) (1):
      ftracetest: Use proper logic to find process PID

----
 .../selftests/ftrace/test.d/instances/instance-event.tc   | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)
---------------------------
commit 97f8827a8c7963756ae7d3ee898675b4667eca73
Author: Steven Rostedt (Red Hat) <rostedt@...dmis.org>
Date:   Mon May 23 10:04:46 2016 -0400

    ftracetest: Use proper logic to find process PID
    
    Half of the test in instance-event.tc was updated to use $! to find the PID
    of the previous background process that was launched, but the second part of
    the test still used the parsing of "jobs", which does not work on all shells
    like $! does.
    
    Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

diff --git a/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc b/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
index 5f2abd03f16b..4c5a061a5b4e 100644
--- a/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
+++ b/tools/testing/selftests/ftrace/test.d/instances/instance-event.tc
@@ -92,28 +92,23 @@ instance_slam() {
 }
 
 instance_slam &
-x=`jobs -l`
-p1=`echo $x | cut -d' ' -f2`
+p1=$!
 echo $p1
 
 instance_slam &
-x=`jobs -l | tail -1`
-p2=`echo $x | cut -d' ' -f2`
+p2=$!
 echo $p2
 
 instance_slam &
-x=`jobs -l | tail -1`
-p3=`echo $x | cut -d' ' -f2`
+p3=$!
 echo $p3
 
 instance_slam &
-x=`jobs -l | tail -1`
-p4=`echo $x | cut -d' ' -f2`
+p4=$!
 echo $p4
 
 instance_slam &
-x=`jobs -l | tail -1`
-p5=`echo $x | cut -d' ' -f2`
+p5=$!
 echo $p5
 
 ls -lR >/dev/null