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nix-daemon: preserve errno in signal handler (thanks tsan)

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This commit is contained in:
Will Dietz 2018-03-14 21:39:01 -05:00
parent 55aa622fb1
commit d98755b0c2
1 changed files with 3 additions and 0 deletions
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3
src/nix-daemon/nix-daemon.cc
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@ -816,8 +816,11 @@ static void processConnection(bool trusted)
static void sigChldHandler(int sigNo) static void sigChldHandler(int sigNo)
{ {
// Ensure we don't modify errno of whatever we've interrupted
auto saved_errno = errno;
/* Reap all dead children. */ /* Reap all dead children. */
while (waitpid(-1, 0, WNOHANG) > 0) ; while (waitpid(-1, 0, WNOHANG) > 0) ;
errno = saved_errno;
} }