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not silently exit merely because the output buffer happens to
have nothing pending.
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(close_stdout_status): Return right away if there's nothing to flush.
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Remove; no longer needed.
"quotearg.h": Add include.
(file_name): Do not bother to explicitly initialize to NULL; it's less
efficient on some hosts.
(close_stdout_status): Remove test as to whether stdout was already
closed; it breaks for the case "echo x | sort >&-".
Quote file name colons.
Do not assume that _("write error") lacks format strings.
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(close_stdout_status): Use new file-scoped global.
Return right away if fstat says the stdout file descriptor is invalid.
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(close_stdout_set_status): New function.
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add FIXME
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