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fiu-ctrl - a script to remote control programs using libfiu


fiu-ctrl [options] PID [PID ...]


fiu-ctrl is a script to enable/disable failure points in running programs that are using

Programs are usually launched using fiu-run(1), which enables libfiu's remote control
capabilities without the need to modify the program's code.

For additional documentation, go to the project's website at


-c command
Run the given libfiu remote control command before executing the program (see below
for reference).

-f ctrlpath
Set the default prefix for remote control over named pipes. Defaults to
"$TMPDIR/fiu-ctrl", or "/tmp/fiu-ctrl" if "$TMPDIR" is not set, which is the
usually correct for programs launched using fiu-run(1).

Remote control commands are of the form "command param1=value1,param2=value2". Valid
commands are:

'enable name=NAME'
Enables the NAME failure point unconditionally.

'enable_random name=NAME,probability=P'
Enables the NAME failure point with a probability of P.

'disable name=NAME'
Disables the NAME failure point.

All of the enable* commands can also optionally take failnum and failinfo parameters,
analogous to the ones taken by the C functions.


The following command will tell the process running with PID 12345 to enable the failure
point posix/io/read with a 25% of probability to fail, and the failure point
libc/mm/malloc with a 5% of probability to fail:

fiu-ctrl -c 'enable_random name=posix/io/*,probability=0.25' \
-c 'enable_random name=libc/mm/*,probability=0.05' 12345

And the following will tell the same process to disable the previously enabled failure
point posix/io/read:

fiu-ctrl -c 'disable name=posix/io/read' 12345

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