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Github Fix io::copy specialization using copy_file_range when writer was opened...
source link: https://github.com/rust-lang/rust/pull/82417
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fixes #82410
While sendfile() returns EINVAL when the output was opened with O_APPEND, copy_file_range() does not and returns EBADF instead, which – unlike other EBADF causes – is not fatal for this operation since a regular write() will likely succeed.
We now treat EBADF as a non-fatal error for copy_file_range and fall back to a read-write copy as we already did for several other errors.
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