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authorJosh Poimboeuf <jpoimboe@redhat.com>2015-01-27 12:10:04 -0600
committerSteven Rostedt <rostedt@goodmis.org>2015-01-27 17:44:57 -0500
commit988427829bcd230c78106d28dbfa85d45d182909 (patch)
tree9860c7341452a0adbad74bf6951f10712233d33d /tools
parentktest: Add timings for commands (diff)
downloadlinux-dev-988427829bcd230c78106d28dbfa85d45d182909.tar.xz
linux-dev-988427829bcd230c78106d28dbfa85d45d182909.zip
ktest: Restore tty settings after closing console
When ktest runs the console program as a child process, the parent and child share the same tty for stdin and stderr. This is problematic when using a libvirt target. The "virsh console" program makes a lot of changes to the tty settings, making ktest's output hard to read (carriage returns don't work). After ktest exits, the terminal is unusable (CRs broken, stdin isn't echoed). I think the best way to fix this issue would be to create a pseudoterminal (pty pair) so the child process would have a dedicated tty, and then use pipes to connect the two ttys. I'm not sure if that's overkill, but it's far beyond my current Perl abilities. This patch is a much easier way to (partially) fix this issue. It saves the tty settings before opening the console and restores them after closing it. There are still a few places where ktest prints mangled output while the console is open, but the output is much more legible overall, and the terminal works just fine after ktest exits. Link: http://lkml.kernel.org/r/1bb89abc0025cf1d6da657c7ba58bbeb4381a515.1422382008.git.jpoimboe@redhat.com Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'tools')
-rwxr-xr-xtools/testing/ktest/ktest.pl7
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 27273c228d92..1dae000f79f8 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -178,6 +178,7 @@ my $checkout;
my $localversion;
my $iteration = 0;
my $successes = 0;
+my $stty;
my $bisect_good;
my $bisect_bad;
@@ -1349,6 +1350,9 @@ sub open_console {
my $flags;
+ # save terminal settings
+ $stty = `stty -g`;
+
my $pid = open($fp, "$console|") or
dodie "Can't open console $console";
@@ -1368,6 +1372,9 @@ sub close_console {
print "closing!\n";
close($fp);
+
+ # restore terminal settings
+ system("stty $stty");
}
sub start_monitor {