.\" -*- mode: troff; coding: utf-8 -*- .\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>. .ie n \{\ . ds C` "" . ds C' "" 'br\} .el\{\ . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "BUFFCHAN 8" .TH BUFFCHAN 8 2024-04-01 "INN 2.7.2" "InterNetNews Documentation" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH NAME buffchan \- Buffered file\-writing backend for INN .SH SYNOPSIS .IX Header "SYNOPSIS" \&\fBbuffchan\fR [\fB\-bru\fR] [\fB\-c\fR \fIlines\fR] [\fB\-C\fR \fIseconds\fR] [\fB\-d\fR \&\fIdirectory\fR] [\fB\-f\fR \fInum-fields\fR] [\fB\-l\fR \fIlines\fR] [\fB\-L\fR \fIseconds\fR] [\fB\-m\fR \fImap\fR] [\fB\-p\fR \fIpid-file\fR] [\fB\-s\fR \fIformat\fR] .SH DESCRIPTION .IX Header "DESCRIPTION" \&\fBbuffchan\fR reads lines from standard input and copies the initial fields in each line to the files named by the remaining fields on the line. \&\fBbuffchan\fR is intended to be called by \fBinnd\fR as an exploder feed. .PP The 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 and do not contain any whitespace. The default number of initial fields is one. .PP For each line of input, \fBbuffchan\fR writes the initial fields, separated by a space and followed by a newline, to each of the files named in the filename fields. The output files are kept open and are only flushed or closed based on the schedule given by the \fB\-c\fR, \fB\-C\fR, \fB\-l\fR, and \fB\-L\fR options. .PP As an exploder feed (see newsfeeds(5) for an explanation), \fBbuffchan\fR interprets lines beginning with an exclamation point as commands. Besides \&\f(CW\*(C`!begin\*(C'\fR (which only marks the start of the feed), there are three supported commands: .IP "!flush [\fIsite\fR]" 4 .IX Item "!flush [site]" The flush command closes and reopens all open files. An optional site can be specified, in which case \fBbuffchan\fR flushes only that file. This command is analogous to the \f(CW\*(C`ctlinnd flush\*(C'\fR command. This command can be sent via \fBinnd\fR using \f(CW\*(C`ctlinnd send \fR\f(CIbuffchan\-site\fR\f(CW \*(Aqflush \fR\f(CIsite\fR\f(CW\*(Aq\*(C'\fR. .Sp Applications can tell that flush has completed by renaming the file before issuing the command. When the original file name has reappeared, the flush is complete. If fchmod(3) is available, \fBbuffchan\fR also changes the file to read-only while it's actively writing to it and changes it back to read/write once it has been closed. It will change the mode back to read-only only if it reopens the same file. .IP "!drop [\fIsite\fR]" 4 .IX Item "!drop [site]" The drop command is similar to the flush command, except that no files are reopened. If given an argument, only the specified site is dropped; otherwise, all sites are dropped. (Note that a site will be restarted if the input stream mentions the site again.) .Sp When a \f(CW\*(C`ctlinnd drop site\*(C'\fR command is sent, \fBinnd\fR will automatically forward the command to \fBbuffchan\fR if the site is listed as a funnel feeding into the \fBbuffchan\fR exploder. To drop all sites, use \f(CW\*(C`ctlinnd send \fR\f(CIbuffchan\-site\fR\f(CW drop\*(C'\fR. .IP !readmap 4 .IX Item "!readmap" The map file specified with the \fB\-m\fR option, if given, will be reloaded. .PP Once \fBbuffchan\fR opens a file, it keeps it open (in the absence of a drop command). The input must therefore never specify more files than the maximum number of files a process may open. .SH OPTIONS .IX Header "OPTIONS" .IP \fB\-b\fR 4 .IX Item "-b" Force the output to be buffered. (This is generally the default, but it may depend on the operating system.) If \fB\-b\fR is given, a buffer size of BUFSIZ (a constant of the system standard I/O library) is used. .IP "\fB\-c\fR \fIlines\fR" 4 .IX Item "-c lines" If the \fB\-c\fR flag is given, \fBbuffchan\fR will close and reopen a file after every \fIlines\fR lines are written to the file. .IP "\fB\-C\fR \fIseconds\fR" 4 .IX Item "-C seconds" If the \fB\-C\fR flag is given, \fBbuffchan\fR will close and reopen a file if it has been open for more than \fIseconds\fR seconds. .IP "\fB\-d\fR \fIdirectory\fR" 4 .IX Item "-d directory" By default, \fBbuffchan\fR writes its output into the \fIpathoutgoing\fR directory. This flag may be used to specify a directory the program should change to before starting. If this flag is used, the default for the \fB\-s\fR flag (see below) is changed to be a simple \f(CW\*(C`%s\*(C'\fR (in other words, output files are considered to be relative to \fIdirectory\fR). .IP "\fB\-f\fR \fInum-fields\fR" 4 .IX Item "-f num-fields" By default, each line is expected to contain one fixed field followed by some number of filename fields. If this flag is given, \fInum-fields\fR will be used as the number of initial fixed fields. .IP "\fB\-l\fR \fIlines\fR" 4 .IX Item "-l lines" If the \fB\-l\fR flag is given, \fBbuffchan\fR will flush the output after every \&\fIlines\fR lines are written to a file. .IP "\fB\-L\fR \fIseconds\fR" 4 .IX Item "-L seconds" If the \fB\-L\fR flag is given, \fBbuffchan\fR will flush each output file every \&\fIseconds\fR seconds. .IP "\fB\-m\fR \fImap\fR" 4 .IX Item "-m map" Map files translate the names in the filename fields on each line into filenames that should be used instead. It's used primarily when short names are used in \fInewsfeeds\fR, but the output files should use the full domain names of remote peers. .Sp In the map file, blank lines and lines starting with a number sign (\f(CW\*(C`#\*(C'\fR) are ignored. All other lines should have two host names separated by a colon. The first field is the name that may appear in the input stream; the second field names the file to be used when the name in the first field appears. .Sp For example, the following map file may be used to map the short names used in the example below to the full domain names: .Sp .Vb 4 \& # This is a comment \& uunet:news.uu.net \& foo:foo.com \& munnari:munnari.oz.au .Ve .IP "\fB\-p\fR \fIpid-file\fR" 4 .IX Item "-p pid-file" If the \fB\-p\fR option is given, \fBbuffchan\fR will write a line containing its process ID (in text) to the specified file when it starts. .IP \fB\-r\fR 4 .IX Item "-r" By default, \fBbuffchan\fR sends its error messages to \fIpathlog\fR/errlog. To suppress this redirection and send error messages to standard error, use the \fB\-r\fR flag. .IP \fB\-s\fR 4 .IX Item "-s" The \fB\-s\fR flag may be used to specify a format that maps a filename from the filename fields at the end of each line to an actual filename. This is a sprintf(3) format string that should contain a single instance of \&\f(CW\*(C`%s\*(C'\fR, which will be replaced with the value of the filename field (possibly after mapping with the map file from \fB\-m\fR). The default value is \fIpathoutgoing\fR/\f(CW\*(C`%s\*(C'\fR. .IP \fB\-u\fR 4 .IX Item "-u" If the \fB\-u\fR flag is used, the output will be unbuffered. .SH EXAMPLES .IX Header "EXAMPLES" If \fBbuffchan\fR is invoked with \f(CW\*(C`\-f 2\*(C'\fR and given the following input: .PP .Vb 3 \& news.software.nntp <1643@munnari.oz.au> foo uunet \& news.software.nntp <102060@litchi.foo.com> uunet munnari \& comp.sources.unix <999@news.foo.com> foo uunet munnari .Ve .PP then the file \fIfoo\fR in \fIpathoutgoing\fR will have these lines: .PP .Vb 2 \& news.software.nntp <1643@munnari.oz.au> \& comp.sources.unix <999@news.foo.com> .Ve .PP the file \fImunnari\fR in \fIpathoutgoing\fR will have these lines: .PP .Vb 2 \& news.software.nntp <102060@litchi.foo.com> \& comp.sources.unix <999@news.foo.com> .Ve .PP and the file \fIuunet\fR in \fIpathoutgoing\fR will have these lines: .PP .Vb 3 \& news.software.nntp <1643@munnari.oz.au> \& news.software.nntp <102060@litchi.foo.com> \& comp.sources.unix <999@news.foo.com> .Ve .PP Using \fBbuffchan\fR this way can be done in \fInewsfeeds\fR with for instance: .PP .Vb 4 \& foo:*,@misc.*:Ap,Tm:buffchan! \& munnari:*,@rec.*:Ap,Tm:buffchan! \& uunet:*:Ap,Tm:buffchan! \& buffchan!:*:Tx,WGm*:/buffchan \-f 2 .Ve .PP It will generate the examples above. See the \f(CW\*(C`W\*(C'\fR flag in newsfeeds(5) for how to parameterize the output. .SH HISTORY .IX Header "HISTORY" Written by Rich $alz for InterNetNews. Converted to POD by Russ Allbery . .SH "SEE ALSO" .IX Header "SEE ALSO" ctlinnd(8), inn.conf(5), innd(8), newsfeeds(5).