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alias_suffixes.meta
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alias_suffixes.stp
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also_ran.meta
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also_ran.stp
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ansi_colors.stp
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ansi_colors2.meta
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badname.meta
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badname.stp
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badname.txt
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callgraph.meta
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callgraph.stp
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callgraph.txt
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click.wav
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cpu_throttle.meta
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cpu_throttle.stp
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eventcount.meta
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eventcount.stp
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eventcount.txt
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func_time_stats.meta
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func_time_stats.stp
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func_time_stats.txt
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grapher.stp
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graphs.meta
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graphs.stp
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helloworld.meta
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helloworld.stp
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key.meta
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key.stp
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keyhack.meta
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keyhack.stp
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measureinterval.meta
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measureinterval.stp
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para-callgraph-verbose.meta
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para-callgraph.meta
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para-callgraph.stp
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para-callgraph.txt
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py2example.meta
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py2example.stp
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py2example.tcl
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py3example.meta
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py3example.tcl
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pyexample.py
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regex.meta
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regex.stp
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return.wav
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sizeof.meta
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sizeof.stp
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sizeof.txt
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sizeof_interactive.meta
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socket-events.meta
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socket-events.stp
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stopwatches.meta
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stopwatches.stp
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tcl-funtop.meta
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tcl-trace.meta
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varwatch.meta
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varwatch.stp
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varwatch.txt
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watchdog.meta
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watchdog.stp
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whythefail.meta
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whythefail.stp
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whythefail.txt
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Code Editor : whythefail.stp
#!/usr/bin/stap /* Print a trace of the the last few statements (file:line numbers, along with selected local variables) that were executed within a given function, if it ends up returning with a given condition. (No trace is shown for functions that return with the condition false, demonstrating use of speculation tapset.) Usage: stap whythefail.stp PROC_OR_KERNEL FUNCTION_NAME CONDITION_EXPRESSION [$VARIABLE$] PROC_OR_KERNEL: the first part of the probe point, e.g.: 'kernel' 'module("foo")' or 'process("bar")' FUNCTION_NAME: the function name (assumed non-recursive) CONDITION: expression to evaluate at function return, e.g.: '$return != 0' or '1' or 'randint(100)<20' VARIABLE: optional context-variable string to print at each statement, e.g.: '$a_var$' or '@var("global")$' or (default) '$$vars' If the script is invoked with -c CMD or -x PID, probes are filtered for that process target-set (it and its descendants). e.g.: stap whythefail.stp kernel do_mlock '$return < 0' */ global specs% global counts probe $1 . function(@2) . call { if (target() && !target_set_pid(pid())) next; specs[tid()] = speculation() counts["entry"] <<< 1 } probe $1 . statement(@2 "@*:*") { if (target() && !target_set_pid(pid())) next; tokenize(pp(),"@"); fileline=tokenize("","@"); file=tokenize(fileline,":\""); line=tokenize("",":\""); speculate(specs[tid()], sprintf("%s[%d] %s:%s %s\n", execname(), tid(), file, line, %( $# >= 4 %? @4.": ".@choose_defined($4,"?") %: "$$vars: ".$$vars %) )) counts["statement"] <<< 1 } probe $1 . function(@2) . return { if (target() && !target_set_pid(pid())) next; if ($3) { printf("\n%s[%d] %s function(%s) $return: %s\n", execname(), tid(), @1, @2, $return$) commit(specs[tid()]) counts["exit-hit"] <<< 1 } else { discard(specs[tid()]) counts["exit-miss"] <<< 1 } } probe end,error { printf("\nstatistics:\n") foreach (reason+ in counts) { printf("%s count: %d\n", reason, @count(counts[reason])) } }
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