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由 Tom Lane 提交于
We had two copies of this function in the backend and libpq, which was already pretty bogus, but it turns out that we need it in some other programs that don't use libpq (such as pg_test_fsync). So put it where it probably should have been all along. The signal-mask-initialization support in src/backend/libpq/pqsignal.c stays where it is, though, since we only need that in the backend.
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