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Richard Yao
313b1ea622
C type coercion rules require that negative numbers be converted into positive numbers via wraparound such that a negative -1 becomes a positive 1. This causes vn_getf to return a file handle when it should return NULL whenever a positive file descriptor existed with the same value. We should check for a negative file descriptor and return NULL instead. This was caught by ClusterHQ's unit testing. Reference: http://stackoverflow.com/questions/50605/signed-to-unsigned-conversion-in-c-is-it-always-safe Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Andriy Gapon <avg@FreeBSD.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #450