to test that it can stand by itself. Include "exitfail.h".
Clients should set exit_failure instead.
(EXIT_FAILURE): Remove; no longer needed. Do not include <stdlib.h>.
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.
