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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ARGUMENTS | EXAMPLES | SAFETY AND SECURITY | SEE ALSO | BUGS | COLOPHON |
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STAPDYN(8) System Manager's Manual STAPDYN(8)
stapdyn - systemtap dyninst runtime
stapdyn [ OPTIONS ] MODULE [ MODULE-OPTIONS ]
The stapdyn program is the dyninst back-end of the Systemtap tool.
It expects a shared library produced by the front-end stap tool, when
run with --dyninst.
Splitting the systemtap tool into a front-end and a back-end allows a
user to compile a systemtap script on a development machine that has
the debugging information (need to compile the script) and then
transfer the resulting shared object to a production machine that
doesn't have any development tools or debugging information
installed.
Please refer to stappaths (7) for the version number, or run rpm -q
systemtap (fedora/red hat) apt-get -v systemtap (ubuntu)
The stapdyn program supports the following options. Any other option
prints a list of supported options.
-v Verbose mode.
-V Print version number and exit.
-w Suppress warnings from the script.
-c CMD Command CMD will be run and the stapdyn program will exit when
CMD does. The '_stp_target' variable will contain the pid for
CMD.
-x PID The '_stp_target' variable will be set to PID.
-o FILE
Send output to FILE. If the module uses bulk mode, the output
will be in percpu files FILE_x(FILE_cpux in background and
bulk mode) where 'x' is the cpu number. This supports
strftime(3) formats for FILE.
-C WHEN
Control coloring of error messages. WHEN must be either
"never", "always", or "auto" (i.e. enable only if at a termi‐
nal). If the option is missing, then "auto" is assumed. Colors
can be modified using the SYSTEMTAP_COLORS environment vari‐
able. See the stap(1) manual page for more information on syn‐
tax and behaviour.
var1=val
Sets the value of global variable var1 to val. Global vari‐
ables contained within a script are treated as options and can
be set from the stapdyn command line.
MODULE is either a module path or a module name. If it is a module
name, the module will be looked for in the following directory (where
'VERSION' is the output of "uname -r"):
/lib/modules/VERSION/systemtap
$ stap --dyninst -p4 -m mod1 -e 'global var1="foo"; probe
begin{printf("%s\n", var1); exit()}'
Running this with an additional module argument:
$ stapdyn mod1.so var1="HelloWorld"
HelloWorld
Spaces and exclamation marks currently cannot be passed into global
variables this way.
See the stapex(3stap) manual page for a collection of sample scripts.
Here is a very basic example of how to use stapdyn. First, use stap
to compile a script. The stap program will report the pathname to
the resulting module.
$ stap --dyninst -p4 -e 'probe begin { printf("Hello World!\n");
exit() }'
/home/user/.systemtap/cache/85/stap_8553d83f78c_265.so
Run stapdyn with the pathname to the module as an argument.
$ stapdyn /home/user/.systemtap/cache/85/stap_8553d83f78c_265.so
Hello World!
Systemtap, in DynInst mode, is a developer tool, and runs completely
unprivileged. The Linux kernel will only permit one's own processes
to be accessed, which is enforced by the ptrace(2) system call. See
the stap(1) manual page for additional information on safety and
security.
stap(1), stapprobes(3stap), stap-server(8), staprun(8), stapex(3stap)
Use the Bugzilla link of the project web page or our mailing list.
http://sourceware.org/systemtap/ , <systemtap@sourceware.org>.
This page is part of the systemtap (a tracing and live-system
analysis tool) project. Information about the project can be found
at ⟨https://sourceware.org/systemtap/⟩. If you have a bug report for
this manual page, send it to systemtap@sourceware.org. This page was
obtained from the project's upstream Git repository
⟨git://sourceware.org/git/systemtap.git⟩ on 2018-02-02. (At that
time, the date of the most recent commit that was found in the repos‐
itory was 2018-02-01.) If you discover any rendering problems in
this HTML version of the page, or you believe there is a better or
more up-to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not part
of the original manual page), send a mail to man-pages@man7.org
STAPDYN(8)
Pages that refer to this page: stap(1), staprun(8)
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