Commits on Jun 10, 2019

1. Don't block in getrandom() detection …

   On Linux, we detect if `getrandom` is present by calling getrandom with
   an empty buffer and seeing if `ENOSYS` is returned. However, even with
   an empty buffer, this call will block unless we explicitly pass a flag.
   
   This can be seen in the source for `getrandom`:
     https://elixir.bootlin.com/linux/v5.1.8/source/drivers/char/random.c#L2043
   
   This change adds a boolean parameter to `syscall_getrandom` to control
   the blocking behavior. We now don't block in initialization, but do
   block when actually reading random data.

   

   josephlr committed Jun 10, 2019
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