tvOS should support named pipes

Originator:jp
Number:rdar://22860545 Date Originated:
Status:Open Resolved:
Product:Apple TV Product Version:
Classification: Reproducible:Always
 
Summary:
mkfifo() and mknod() should be supported on tvOS, but currently aren’t as of Beta 2.

Steps to Reproduce:
Call mkfifo() or mknod() with a destination file in an otherwise writable location such as NSTemporaryDirectory() or Library/Caches

Expected Results:
Named pipe should be created successfully.

Actual Results:
An EPERM file exception is thrown.

Regression:
tvOS Beta 1 supported this.

Notes:
More discussion about this limitation can be found here: https://github.com/realm/realm-cocoa/issues/2559#issuecomment-143324972

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