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This is only supported when SIGUSR1 is sent only to the master
process (which then resends SIGUSR1 to the workers).
Since we only added support for user/group switching in the
workers, we now chown any log files upon switching users so the
master can pick up and chown the log files later on. Thus
we can avoid having to restart workers because they fail to
rotate log files on their own.
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Subclass off the core File class so we don't have to
worry about #size being defined. This will mainly
be useful to Rainbows! but allows us to simplify
our TeeInput implementation a little, too.
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?/ avoids allocating a String in 1.8 and in 1.9 short String
objects are cheap.
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One less thing to RDoc
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This ensures any string literals that pop up in *our* code will
just be a bag of bytes. This shouldn't affect/fix/break
existing apps in most cases, but most constants will always have
the "correct" encoding (none!) to be consistent with HTTP/socket
expectations. Since this comment affects things only on a
per-source basis, it won't affect existing apps with the
exception of strings we pass to the Rack application.
This will eventually allow us to get rid of that Unicorn::Z
constant, too.
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With the 1.9.2preview1 release (and presumably 1.9.1 p243), the
Ruby core team has decided that bending over backwards to
support crippled operating/file systems was necessary and that
files must be closed before unlinking.
Regardless, this is more efficient than using Tempfile because:
1) no delegation is necessary, this is a real File object
2) no mkdir is necessary for locking, we can trust O_EXCL
to work properly without unnecessary FS activity
3) no finalizer is needed to unlink the file, we unlink
it as soon as possible after creation.
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Ensure we preserve both internal and external encodings
when reopening logs.
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Since I use it myself and also in the tests, we
might as well implement it correctly as a class method
so people can run it in their trap('USR2') hooks.
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