I discussed this with Eregon (Benoit Daloze) and I think the goal here is to try and figure out a way these interfaces can be a bit less confusing.
1. I don't understand this behaviour:¶
STDOUT.close STDOUT.puts "Hello World" # => closed stream
IO.for_fd(STDOUT.fileno, autoclose: true).close STDOUT.puts "Hello World" # => Hello World
IO.for_fd(..., autoclose: true/false)¶
The documentation for
If the value is false, the fd will be kept open after this IO instance gets finalized.
But it also seems to affect
#close - i.e. calling close does not close underlying file descriptor.
Should we fix the documentation or is the implementation wrong? Maybe the name
autoclose: is very confusing. My initial interpretation was it was just 'automatically close this I/O when it is garbage collected'.
IO.for_fd(..., autoclose: false) default¶
In most cases, it seems like
autoclose: false would make more sense as the default, since the file descriptor must come from some other place.