path: root/tools/testing/ktest/ktest.pl
diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2017-03-08 11:06:05 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-03-08 11:06:05 -0800
commit8557b8e43a1de99b12b0d61384742e0d5d0adf84 (patch)
tree133775755b99d1f44713d822879b377b2bc62849 /tools/testing/ktest/ktest.pl
parentoverlayfs: remove now unnecessary header file include (diff)
parentktest: Make sure wait_for_input does honor the timeout (diff)
Merge tag 'ktest-v4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-ktest
Pull ktest fixes from Steven Rostedt: "Greg Kroah-Hartman reported to me that the ktest of v4.11-rc1 locked up in an infinite loop while doing the make mrproper. Looking into the cause I noticed that a recent update to the function run_command (used for running all shell commands, including "make mrproper") changed the internal loop to use the function wait_for_input. The wait_for_input function uses select to look at two file descriptors. One is the file descriptor of the command it is running, the other is STDIN. The STDIN check was not checking the return status of the sysread call, and was also just writing a lot of data into syswrite without regard to the size of the data read. Changing the code to check the return status of sysread, and also to still process the passed in descriptor data without looping back to the select fixed Greg's problem. While looking at this code I also realized that the loop did not honor the timeout if STDIN always had input (or for some reason return error). this could prevent wait_for_input to timeout on the file descriptor it is suppose to be waiting for. That is fixed too" * tag 'ktest-v4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-ktest: ktest: Make sure wait_for_input does honor the timeout ktest: Fix while loop in wait_for_input
Diffstat (limited to 'tools/testing/ktest/ktest.pl')
1 files changed, 13 insertions, 8 deletions
diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 6e4eb2fc2d1e..0c8b61f8398e 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -1880,6 +1880,7 @@ sub get_grub_index {
sub wait_for_input
my ($fp, $time) = @_;
+ my $start_time;
my $rin;
my $rout;
my $nr;
@@ -1895,17 +1896,22 @@ sub wait_for_input
vec($rin, fileno($fp), 1) = 1;
vec($rin, fileno(\*STDIN), 1) = 1;
+ $start_time = time;
while (1) {
$nr = select($rout=$rin, undef, undef, $time);
- if ($nr <= 0) {
- return undef;
- }
+ last if ($nr <= 0);
# copy data from stdin to the console
if (vec($rout, fileno(\*STDIN), 1) == 1) {
- sysread(\*STDIN, $buf, 1000);
- syswrite($fp, $buf, 1000);
+ $nr = sysread(\*STDIN, $buf, 1000);
+ syswrite($fp, $buf, $nr) if ($nr > 0);
+ }
+ # The timeout is based on time waiting for the fp data
+ if (vec($rout, fileno($fp), 1) != 1) {
+ last if (defined($time) && (time - $start_time > $time));
@@ -1917,12 +1923,11 @@ sub wait_for_input
last if ($ch eq "\n");
- if (!length($line)) {
- return undef;
- }
+ last if (!length($line));
return $line;
+ return undef;
sub reboot_to {