stapref man page

stapref — systemtap language reference

Description

The reference for the systemtap scripting language.

Language

Keywords

· break
· continue
· delete
· else
· exit
· foreach
· for
· function
· global
· private
· if
· in
· next
· probe
· return
· try/catch
· while

Data Types and Operators

Integers
· var1 = 5
· global var2 = 10

Strings
· var1 = "string1"
· global var2 = "string2"

Associative Arrays
· global array1[]
· global array2[SIZE]
· array[index] = 5

Context Variables
· $var
· $var$ (pretty printed string form)

Binary numeric operators
· * / % + - << >> & ^ | && ||

Binary string operators
· . (string concatenation)

Numeric assignment operators
· = += -= *= /= %= >>= <<= &= ^= |= 

String assignment operators
· = .= 

Unary numeric operators
· + - ! ~ ++ -- 

Numeric & string comparison operators
· < > <= >= == != 

Regular expression matching operators
· =~ !~ 

Ternary operator
· cond ? exp1 : exp2

Grouping operator
· ( expression )

Array operators
· array[index] (array read/write)
· [index] in array

Aggregation operator
· var <<< value

Statements

Jump Statements
· continue
· break
· next
· return expression
· try statement catch (message)
Selection Statements
· if (expression) statement 
· else statement
Iteration Statements
· foreach (variable in array) statement
· foreach ([var1,var2,...] in array) statement
· for (expression; expression; expression) statement
· while (expression) statement
Declaration Statements
· function name (variable : type, ...) { statement }
· function name : type (variable : type, ...) { statement }
· function name : type (variable : type, ...) %{ c_statement %}
· probe probepoint { statement }
· probe label = probepoint { statement }

Lexical Structure

Comments
· # ... comment
· // ... comment
· /* ... comment ... */
Preprocessor
· %( expression %? true_tokens %: false_tokens %)
· @define label (variable, ...) %{ statement %}

Builtin Functions

Aggregation Builtin Functions
· @avg (variable)
· @count (variable)
· @hist_linear (variable, N, N, N)
· @hist_log (variable)
· @max (variable)
· @min (variable)
· @sum (variable)
Output Builtin Functions
· print (variable)
· printf (format:string, variable, ...) 
  where format is of the form: %[flags][width][.precision][length]specifier
· printd (delimiter:string, variable, ...)
· printdln (delimiter:string, variable, ...)
· println ()
· sprint:string (variable)
· sprintf:string (format:string, variable, ...)
Variable Access Builtin Functions
· @cast (variable, "type_name"[, "module"])
· @defined (variable)

Probepoints

Some of the more commonly used probepoints
· kernel.function(PATTERN) kernel.function(PATTERN).call
· kernel.function(PATTERN).return
· kernel.FUNCTION (PATTERN).return.maxactive(VALUE)
· kernel.FUNCTION (PATTERN).inline
· kernel.FUNCTION (PATTERN).label(LPATTERN)
· module(MPATTERN).FUNCTION (PATTERN)
· module(MPATTERN).FUNCTION (PATTERN).call
· module(MPATTERN).FUNCTION (PATTERN).return.maxactive(VALUE)
· module(MPATTERN).FUNCTION (PATTERN).inline
· kernel.statement(PATTERN)
· kernel.statement(ADDRESS).absolute
· module(MPATTERN).statement(PATTERN)
· kprobe.FUNCTION (FUNCTION)
· kprobe.FUNCTION (FUNCTION).return
· kprobe.module(NAME).FUNCTION (FUNCTION)
· kprobe.module(NAME).FUNCTION (FUNCTION).return
· kprobe.statement(ADDRESS).absolute
· process.begin process("PATH").begin
· process(PID).begin process.thread.begin
· process("PATH").thread.begin
· process(PID).thread.begin
· process.end
· process("PATH").end
· process(PID).end
· process.thread.end
· process("PATH").thread.end
· process(PID).thread.end
· process("PATH").syscall
· process(PID).syscall
· process.syscall.return
· process("PATH").syscall.return
· process(PID).syscall.return
· process("PATH").FUNCTION ("NAME")
· process("PATH").statement("*@FILE.c:123")
· process("PATH").FUNCTION ("*").return
· process("PATH").FUNCTION ("myfun").label("foo")
· process("PATH").mark("LABEL")
· java("PNAME").class("CLASSNAME").method("PATTERN")
· java("PNAME").class("CLASSNAME").method("PATTERN").return
· java(PID).class("CLASSNAME").method("PATTERN")
· java(PID).class("CLASSNAME").method("PATTERN").return

Tapset Functions

Some of the more commonly used tapset functions
· addr:long ()
· backtrace:string ()
· caller:string ()
· caller_addr:long ()
· cmdline_arg:string (N:long)
· cmdline_args:string (N:long,m:long,delim:string)
· cmdline_str:string ()
· env_var:string (name:string)
· execname:string ()
· int_arg:long (N:long)
· isinstr:long(s1:string,s2:string)
· long_arg:long (N:long)
· modname:string ()
· module_name:string ()
· pid:long ()
· pn:string ()
· pointer_arg:string (N:long)
· pp:string ()
· print_backtrace ()
· probefunc:string ()
· register:long(name:string)
· str_replace:string(prnt_str:string,srch_str:string,rplc_str:string)
· stringat:long(str:string,pos:long)
· strlen:long(str:string)
· strtol:long(str:string,base:long)
· substr:string(str:string,start:long,length:long)
· user_long:long(addr:long)
· user_string:string(addr:long)

See Also

stap(1)

Bugs

Use the Bugzilla link of the project web page or our mailing list. http://sourceware.org/systemtap/,<systemtap@sourceware.org>.

Referenced By

stap(1).