diff options
authorRichard Purdie <>2017-01-04 23:23:52 +0000
committerRichard Purdie <>2017-01-05 13:51:36 +0000
commit26243f04e3af652291d13e85c084057104fe155b (patch)
parent518b9015c2be8d3894277a8e54890d6f04d656c0 (diff)
prserv/serv: Tweak stdout manipulation to be stream safe
We've been seeing oe-selftest failures under puzzling circumstances. It turns out if you run oe-selftest on a machine with xmlrunner installed and have the recent tinfoil2 changes, the launching of PR server crashes leading to selftest hanging if using an autoloaded PR server. The reason is that xmlrunner uses an io.StringIO object as stdout/stderr instead of the usual io.TextIOWrapper and StringIO lacks a fileno() method. We have to deal with both cases and in the python way, we try and then seek forgivness if we see an AttributeError or UnSupportedOperation exception. Unfortunately we have to deal with both cases as we may be performing a traditiional double fork() from the commandline, or a larger python program. [YOCTO #10866] Signed-off-by: Richard Purdie <>
1 files changed, 17 insertions, 4 deletions
diff --git a/lib/prserv/ b/lib/prserv/
index 350b085..d9b602f 100644
--- a/lib/prserv/
+++ b/lib/prserv/
@@ -242,12 +242,25 @@ class PRServer(SimpleXMLRPCServer):
+ # We could be called from a python thread with io.StringIO as
+ # stdout/stderr or it could be 'real' unix fd forking where we need
+ # to physically close the fds to prevent the program launching us from
+ # potentially hanging on a pipe. Handle both cases.
si = open('/dev/null', 'r')
+ try:
+ os.dup2(si.fileno(),sys.stdin.fileno())
+ except (AttributeError, io.UnsupportedOperation):
+ sys.stdin = si
so = open(self.logfile, 'a+')
- se = so
- os.dup2(si.fileno(),sys.stdin.fileno())
- os.dup2(so.fileno(),sys.stdout.fileno())
- os.dup2(se.fileno(),sys.stderr.fileno())
+ try:
+ os.dup2(so.fileno(),sys.stdout.fileno())
+ except (AttributeError, io.UnsupportedOperation):
+ sys.stdout = so
+ try:
+ os.dup2(so.fileno(),sys.stderr.fileno())
+ except (AttributeError, io.UnsupportedOperation):
+ sys.stderr = so
# Clear out all log handlers prior to the fork() to avoid calling
# event handlers not part of the PRserver