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BUFFCHAN(8)									      BUFFCHAN(8)

       buffchan - buffered file-writing backend for InterNetNews

       buffchan [ -b ] [ -c lines ] [ -C seconds ] [ -d directory ] [ -f fields ] [ -m map ] [ -p
       pidfile ] [ -l lines ] [ -L seconds ] [ -r ] [ -s file_format ] [ -u ]

       Buffchan reads lines from standard input and copies certain fields in each line into files
       named by other fields within the line.  Buffchan is intended to be called by innd(8) as an
       exploder feed.

       -b     Once buffchan opens a file it keeps it open.  The input must therefore never  spec-
	      ify  more files than can the number of available descriptors can keep open.  If the
	      ``-b'' flag is used, the program will allocate a buffer and attach it to	the  file
	      using setbuf(3).

       -c     If  the ``-c'' flag is used with a number n, then buffchan will close, and re-open,
	      a file after every n lines are written to a file.

       -C     Similarly, the ``-C'' flag may be used to specify that all files should  be  closed
	      and re-opened every n seconds.

       -d     The  ``-d''  flag  may  be used to specify a directory the program should change to
	      before starting.	If this flag is used, then the default for  the  ``-s''  flag  is
	      changed to be a simple ``%s.''

       -f     Buffchan input is interpreted as a set of lines.	Each line contains a fixed number
	      of initial fields, followed by a variable number of filename fields.  All fields in
	      a  line  are separated by whitespace.  The default number of initial fields is one;
	      the ``-f'' flag may be used to specify a different number of fields.

       -m     See filechan(8) for an example.

       -p     If the ``-p'' flag is used, the program will write a line containing its process ID
	      (in text) to the specified file.

       -l     If the ``-l'' flag is used with a number n, then buffchan will call fflush(3) after
	      every n lines are written to a file.

       -L     If the ``-L'' flag is used with a number n, then all files will be flushed every	n

       -r     By default, the program sets its standard error to <pathlog in inn.conf>/errlog.

	      To suppress this redirection, use the ``-r'' flag.

       -s     After  the  initial fields, each remaining field names a file to write.  The ``-s''
	      flag may be used to specify a format string that maps the field  to  a  file  name.
	      This  is	a  sprintf(3)  format  string which should have a single ``%s'' parameter
	      which will be given the field.  The default value is <pathoutgoing in inn.conf>/%s.
	      See the description of this flag in filechan(8).

       -u     If the ``-u'' flag is used, the program will request unbuffered output.

       Buffchan can be invoked as an exploder feed (see newsfeeds(5)).	As such, if a line starts
       with an exclamation point it will be treated as a  command.   There  are  three	commands,
       described below:

       flush  The  ``flush''  command  closes  and  re-opens  all open files; ``flush xxx'' which
	      flushes only the specified site.	These are analogous to the  ctlinnd(8)	``flush''
	      command, and can be achieved by doing a ``send "flush xxx"'' command.  Applications
	      can tell that the ``flush'' has completed by renaming the file before  issuing  the
	      command;	buffchan has completed the command when the original filename re-appears.
	      If <$ac_cv_func_fchmod in config.cache> is ``yes'', then buffchan also changes  the
	      access  permissions of the file from read-only for everyone to read-write for owner
	      and group as it flushes or closes each output file.  It will change the modes  back
	      to read-only if it re-opens the same file.

       drop   The  ``drop'' command is similar to the ``flush'' command except that any files are
	      not re-opened.  If given an argument, then the specified site is dropped, otherwise
	      all  sites  are dropped.	(Note that the site will be restarted if the input stream
	      mentions the site.)  When a ctlinnd ``drop site'' command is sent, innd will  auto-
	      matically  forward  the command to buffchan if the site is a funnel that feeds into
	      this exploder.  To drop all sites, use the ctlinnd ``send buffchan-site drop'' com-

	      The map file (specified with the ``-m'' flag) is reloaded.

       Written	by  Rich  $alz	<rsalz@uunet.uu.net> for InterNetNews.	This is revision,
       dated 2000/08/17.

       ctlinnd(8), filechan(8), inn.conf(5), innd(8), newsfeeds(5).

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