Gilles Peskine ec4733b645 Make the memset call prior to FD_ZERO conditional to needing it ...

Zeroing out an fd_set before calling FD_ZERO on it is in principle
useless, but without it some memory sanitizers think the fd_set is
still uninitialized after FD_ZERO (e.g. clang-msan/Glibc/x86_64 where
FD_ZERO is implemented in assembly). Make the zeroing conditional on
using a memory sanitizer.

2018-04-05 14:55:47 +02:00

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