Handle EINTR in Stream.poll()

[vmalloc]

It seems like Stream.poll() did not retry select() in cases of signal interruptions

[tomerfiliba]

okay, i added a call to signal.siginterrupt in the forked child, so this should solve the issue.

i agree it's a good practice to handle the possible EINTR, but because it's in the "critical path", i'm a bit more cautious about it. besides, it's a bit complicated to cover all cases of EINTR, as almost any syscall can return with this errno. if the problem persists, i'll incorporate the patch, but if not, i think its best to leave it this way. thanks for the research!

[tomerfiliba]

i'm closing the issue now, let me now if the problem persists

[vmalloc]

Awesome. Thanks!