.\" Automatically generated by Pod::Man 4.10 (Pod::Simple 3.35) .\" .\" 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 .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" RRDp \- Attach rrdtool from within a perl script via a set of pipes; .SH "SYNOPSIS" .IX Header "SYNOPSIS" use \fBRRDp\fR .PP \&\fBRRDp::start\fR \fIpath to rrdtool executable\fR .PP \&\fBRRDp::cmd\fR \fIrrdtool commandline\fR .PP \&\f(CW$answer\fR = \fBRRD::read\fR .PP \&\f(CW$status\fR = \fBRRD::end\fR .PP \&\fB\f(CB$RRDp::user\fB\fR, \fB\f(CB$RRDp::sys\fB\fR, \fB\f(CB$RRDp::real\fB\fR .SH "DESCRIPTION" .IX Header "DESCRIPTION" With this module you can safely communicate with the rrdtool. .PP After every \fBRRDp::cmd\fR you have to issue an \fBRRDp::read\fR command to get \&\fBrrdtool\fRs answer to your command. The answer is returned as a pointer, in order to speed things up. If the last command did not return any data, \fBRRDp::read\fR will return an undefined variable. .PP If you import the \s-1PERFORMANCE\s0 variables into your namespace, you can access rrdtools internal performance measurements. .IP "use \fBRRDp\fR" 8 .IX Item "use RRDp" Load the RRDp::pipe module. .IP "\fBRRDp::start\fR \fIpath to rrdtool executable\fR" 8 .IX Item "RRDp::start path to rrdtool executable" start rrdtool. The argument must be the path to the rrdtool executable .IP "\fBRRDp::cmd\fR \fIrrdtool commandline\fR" 8 .IX Item "RRDp::cmd rrdtool commandline" pass commands on to rrdtool. check the rrdtool documentation for more info on the rrdtool commands. .ie n .IP "$answer = \fBRRDp::read\fR" 8 .el .IP "\f(CW$answer\fR = \fBRRDp::read\fR" 8 .IX Item "$answer = RRDp::read" read rrdtools response to your command. Note that the \f(CW$answer\fR variable will only contain a pointer to the returned data. The reason for this is, that rrdtool can potentially return quite excessive amounts of data and we don't want to copy this around in memory. So when you want to access the contents of \f(CW$answer\fR you have to use $$answer which dereferences the variable. .ie n .IP "$status = \fBRRDp::end\fR" 8 .el .IP "\f(CW$status\fR = \fBRRDp::end\fR" 8 .IX Item "$status = RRDp::end" terminates rrdtool and returns rrdtools status ... .IP "\fB\f(CB$RRDp::user\fB\fR, \fB\f(CB$RRDp::sys\fB\fR, \fB\f(CB$RRDp::real\fB\fR" 8 .IX Item "$RRDp::user, $RRDp::sys, $RRDp::real" these variables will contain totals of the user time, system time and real time as seen by rrdtool. User time is the time rrdtool is running, System time is the time spend in system calls and real time is the total time rrdtool has been running. .Sp The difference between user + system and real is the time spent waiting for things like the hard disk and new input from the perl script. .SH "EXAMPLE" .IX Header "EXAMPLE" .Vb 8 \& use RRDp; \& RRDp::start "/usr/local/bin/rrdtool"; \& RRDp::cmd qw(create demo.rrd \-\-step 100 \& DS:in:GAUGE:100:U:U \& RRA:AVERAGE:0.5:1:10); \& $answer = RRDp::read; \& print $$answer; \& ($usertime,$systemtime,$realtime) = ($RRDp::user,$RRDp::sys,$RRDp::real); .Ve .SH "SEE ALSO" .IX Header "SEE ALSO" For more information on how to use rrdtool, check the manpages. .SH "AUTHOR" .IX Header "AUTHOR" Tobias Oetiker