diff options
Diffstat (limited to 'doc/SystemTap_Beginners_Guide/en-US/Scripts.xml')
| -rw-r--r-- | doc/SystemTap_Beginners_Guide/en-US/Scripts.xml | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/doc/SystemTap_Beginners_Guide/en-US/Scripts.xml b/doc/SystemTap_Beginners_Guide/en-US/Scripts.xml index ca507b43..e0b7c12c 100644 --- a/doc/SystemTap_Beginners_Guide/en-US/Scripts.xml +++ b/doc/SystemTap_Beginners_Guide/en-US/Scripts.xml @@ -44,7 +44,7 @@ <para> SystemTap scripts allow insertion of the instrumentation code without - recompilation of the code. and allows more flexibility with regard to + recompilation of the code and allows more flexibility with regard to handlers. Events serve as the triggers for handlers to run; handlers can be specified to record specified data and print it in a certain manner. </para> @@ -66,6 +66,23 @@ probe <replaceable>event</replaceable> {<replaceable>statements</replaceable>} single probe, SystemTap will execute the handler when any of the specified events occur. </para> + + <para> + Each probe has a corresponding <firstterm>statement block</firstterm>. This statement block is + enclosed in braces (<command>{ }</command>) and contains the handlers to be executed per event. + SystemTap executes these handlers (i.e. "statements") in sequence; special separators or + terminators are generally not necessary between multiple handlers. + </para> + +<note> + <title>Note</title> + <para> + Statement blocks in SystemTap scripts follow the same syntax and semantics as the C + programming language. A statement block can also nest another statement block, although + for the most part this is used only to organize code in the script for the benefit of the + administrator. + </para> +</note> <para> Systemtap allow you to write functions to factor out code to be used by a @@ -314,7 +331,7 @@ probe timer.s(4) </section> <section id="systemtapscript-handler"> - <title>Systemtap Handler/Boddy</title> + <title>Systemtap Handler/Body</title> <para> Consider the following sample script: </para> @@ -462,13 +479,14 @@ hald(2360) open <para>The number of seconds since UNIX epoch (January 1, 1970).</para> </listitem> </varlistentry> - +<!-- <varlistentry> <term>get_cycles()</term> <listitem> <para>A snapshot of the hardware cycle counter.</para> </listitem> </varlistentry> +--> <varlistentry> <term>pp()</term> |