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BUFFCHAN(8)
NAME
buffchan - buffered file-writing backend for InterNetNews
SYNOPSIS
buffchan [ -b ] [ -c lines ] [ -C seconds ] [ -d directory ] [ -f
num_fields ] [ -m map ] [ -p pidfile ] [ -l lines ] [ -L seconds ] [ -r ] [
-s filename_format ] [ -u ]
DESCRIPTION
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.
OPTIONS
-b Once buffchan opens a file it keeps it open. The input must therefore
never specify more files than 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 lines
If the ``-c'' flag is used, buffchan will close, and re-open, a file
after every lines lines are written to a file.
-C seconds
Similarly, the ``-C'' flag may be used to specify that all files
should be closed and re-opened every seconds seconds.
-d directory
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 num_fields
Buffchan input is interpreted as a sequence 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 map
Map files specify short names as aliases for domain names; see
filechan(8) for details and an example.
-p pidfile
If the ``-p'' flag is used, the program will write a line containing
its process ID (in text) to the specified file.
-l lines
If the ``-l'' flag is used, buffchan will call fflush(3) after every
lines lines are written to a file.
-L seconds
If the ``-L'' flag is used, all files will be flushed every n seconds.
-r By default, the program sends its error messages to
<pathlog in inn.conf>/errlog. To suppress this redirection and send
error messages to standard error, use the ``-r'' flag.
-s filename_format
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 contents of a
non-initial 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
no files are 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 automatically forward the
command to buffchan for sites listed as funnels feeding into this
exploder. To drop all sites, use the ctlinnd ``send buffchan-site
drop'' command.
readmap
The map file (specified with the ``-m'' flag) is reloaded.
HISTORY
Written by Rich $alz <rsalz@uunet.uu.net> for InterNetNews. This is
revision 1.8, dated 2002/12/03.
SEE ALSO
ctlinnd(8), filechan(8), inn.conf(5), innd(8), newsfeeds(5).
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Index for
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