[PATCH] mountstats: Fix spurious I/O errors

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When running mountstats under "watch," occassionally the output
shows "close failed in file object desctructor: sys.excepthook is
missing" and the data display is messed up. This seems to be a
common problem when Python script output is piped to another
program.

Ensure stdout/stderr is completely flushed before mountstats exits,
and add an IOError exception handler to catch these exceptions
gracefully.

Solution suggested by: http://bugs.python.org/issue11380

Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
 tools/mountstats/mountstats.py |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/mountstats/mountstats.py b/tools/mountstats/mountstats.py
index 9a6ec43..e6a456c 100644
--- a/tools/mountstats/mountstats.py
+++ b/tools/mountstats/mountstats.py
@@ -612,8 +612,12 @@ try:
         nfsstat_command()
     elif prog == 'ms-iostat':
         iostat_command()
+    sys.stdout.close()
+    sys.stderr.close()
 except KeyboardInterrupt:
     print('Caught ^C... exiting')
     sys.exit(1)
+except IOError:
+    pass
 
 sys.exit(0)

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