.\" -*- nroff -*-
.TH STAPVARS 3stap 
.SH NAME
stapvars \- systemtap variables

.SH DESCRIPTION
The following sections enumerate the public variables provided by
standard tapsets installed, (the installation path is show in the
stappaths (7) manual page).  Each variable is described with a
type, and its behavior/restrictions.
The syntax is the same as printed with the 
.IR stap " option " \-p2 .
Examples:

.TP
example1:long
Variable "example1" contains an integer.

.TP
example2:string [long]
Variable "example2" is an array of strings, indexed by integers.

.SS ARGV

.TP
argc:long
Contains the value of the
.BR
$#
value: the number of command line arguments passed to the systemtap script.
It is initialized with an implicit begin(\-1) probe.

.TP
argv:string [long]
Contains each command line argument as a string.  argv[1] will equal @1 if
there was at least one command line argument.  Arguments beyond #32 are not
transcribed, and produce a warning message within the begin(\-1) probe that
initializes this array.

.SS NULL

.TP
NULL:long
Simply defined as the number 0.

.SH FILES
.TP
More files and their corresponding paths can be found in the stappaths (7) manual page.

.SH SEE ALSO
.nh
.nf
.IR stap (1)
.IR stappaths (7)