Add support for dup/dup2 #28
Merged
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This adds support for duplicating file descriptors via a
FileDescriptor.duplicate
method:The method dispatches to either
dup
ordup2
based on whether or not it has an explicit target.Usually, a non-nil
target
will be one of the file descriptors conventionally reserved for the stdin/stdout/stderr role; these were previously assigned symbolic names in #21. To target other file descriptors, users will need to use the.init(rawValue:)
initializer. (This will rarely be needed, but some like to pass additional communication channels down to child processes using some custom numbering convention beyond the universal 0/1/2.)