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   dtrace    ( 1 )

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Имя (Name)

dtrace - Dtrace compatible user application static probe generation tool.

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Синопсис (Synopsis)

dtrace -s file [OPTIONS]

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Описание (Description)

The dtrace command converts probe descriptions defined in file.d into a probe header file via the -h option or a probe description file via the -G option.

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Параметры (Options)

-h     generate a systemtap header file.

       -G     generate a systemtap probe definition object file.

       -o file
              is the name of the output file.  If the -G option is given
              then the output file will be called file.o; if the -h
              option is given then the output file will be called
              file.h.

       -C     run the cpp preprocessor on the input file when the -h
              option is given.

       -I file
              give this include path to cpp when the -C option is given.

       -k     keep temporary files, for example the C language source
              for the -G option.

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Примеры (Examples)

Systemtap is source compatible with dtrace user application
       static probe support.  Given a file test.d containing:

              provider sdt_probes
              {
                probe test_0 (int type);
                probe test_1 (struct astruct node);
              };
              struct astruct {int a; int b;};

       Then the command "dtrace -s test.d -G" will create the probe
       definition file test.o and the command "dtrace -stest.d -h" will
       create the probe header file test.h Subsequently the application
       can use the generated macros this way:

              #include "test.h"
               ...
              struct astruct s;
               ...
              SDT_PROBES_TEST_0(value);
               ...
              if (SDT_PROBES_TEST_1_ENABLED())
                  SDT_PROBES_TEST_1(expensive_function(s));

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SEMAPHORES

Semaphores are flag variables used by probes as a way of bypassing potentially costly processing to prepare arguments for probes that may not even be active. They are automatically set/cleared by systemtap when a relevant script is running, so the argument setup cost is only paid when necessary. These semaphore variables are defined within the the "test.o" object file, which must therefore be linked into an application.

Sometimes, semaphore variables are not necessary nor helpful. Skipping them can simplify the build process, by omitting the extra "test.o" file. To skip dependence upon semaphore variables, include "<sys/sdt.h>" within the application before "test.h":

#include <sys/sdt.h> #include "test.h" ... struct astruct s; ... SDT_PROBES_TEST_0(value); ... if (SDT_PROBES_TEST_1_ENABLED()) SDT_PROBES_TEST_1(cheap_function(s));

In this mode, the ENABLED() test is fixed at 1.

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Смотри также (See also)

stap(1), stappaths(7)

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Ошибки (баги) (Bugs)

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

error::reporting(7stap), https://sourceware.org/systemtap/wiki/HowToReportBugs

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