Tokio shim wishlist

[tiif]

I ran 1461 tests from tokio test suite with miri, 1230 of them passed, 217 failed, and 14 exceeded 5 minutes timeout.

Among the 217 failed tests, 159 of them are unsupported FFI errors. Below are the number of occurences for each unsupported syscall:

  count 
    132 socket
     10 mkfifo
      8 sigaction
      2 getaddrinfo
      2 fchmod
      1 shutdown
      1 linkat
      1 getsockopt
      1 fstat
      1 chmod

total count: 159

Note: the test above does not include tokio's docs test, I will update this in future.

Supported syscall but with unsupported flag:

1. F_GETFL for fcntl