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logger processes.

Looking for confirmation from Rainer that this resolves the ambiguity
he observed in Message-ID: <4A0C9430.2090404@kippdata.de>.

Note that the shell may decide to ignore the chdir, so test with "|$cmd"
syntax to compare to the expected behavior from 5/14 or earlier. 


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log process selection (| vs $ vs default) in ap_open_piped_log


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child logger process failures, by migrating back to 2.0.49 and prior when
rotated logs were reliable on Solaris, etc.

Provides two new piped syntaxes for ErrorLog; "||program" or "|$shellcmd",
where the existing 2.2 behavior may be preserved or the new 2.4 behavior
explicitly elected.  The default should discourage users from "|$" syntax
except as required, in the future.




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of return to release for obvious reserved keyword
reasons :)


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requires grab/return


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API and just does providers direct


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* include/http_log.h: Remove piped_log structure definition here;
  (ap_piped_log_read_fd, ap_piped_log_write_fd): Turn macros into
  functions.             

* server/log.c: Move piped_log structure definition here; replace
  fds[2] with read_fd, write_fd.
  (ap_piped_log_read_fd, ap_piped_log_write_fd): New functions.
  (throughout...): Replace use of ap_piped_log_write_fd, 
  ap_piped_log_read_fd, with direct reference to structure fields.


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Translated by: Nilgün Belma Bugüner <nilgun belgeler.org>
Reviewed by:  Orhan Berent <berent belgeler.org>

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piped loggers is nonsense. It doesn't work when
the logger path contains whitespace.

We already allow relative paths because we open
the log program via the shell.

Code was taken from mod_rewrite and mod_log_forensic,
which need to be still fixed (removing
ap_server_root_relative() should suffice).


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