libfiu - Fault injection in userspace
/* Core API */
int fiu_init(unsigned int flags);
int fiu_fail(const char *name);
[void] fiu_do_on(char *name, action); [macro]
[void] fiu_exit_on(char *name); [macro]
[void] fiu_return_on(char *name, retval); [macro]
/* Control API */
int fiu_enable(const char *name, int failnum,
void *failinfo, unsigned int flags);
int fiu_enable_random(const char *name, int failnum,
void *failinfo, unsigned int flags, float probability);
typedef int external_cb_t(const char *name, int *failnum,
void **failinfo, unsigned int *flags);
int fiu_enable_external(const char *name, int failnum,
void *failinfo, unsigned int flags,
int fiu_disable(const char *name);
int fiu_rc_fifo(const char *basename);
libfiu is a library for fault injection. It provides functions to mark
"points of failure" inside your code (the "core API"), and functions to
enable/disable the failure of those points (the "control API").
The core API is used inside the code wanting to perform fault injection
on. The control API is used inside the testing code, in order to
control the injection of failures.
This page is an API reference and not a complete manual, and as such
does not go into detail about how to use the library. The library’s
manual can be found in the distribution.
To use the core API, you should #include <fiu.h>.
Because fault injection is usually a debugging/testing facility,
unwanted at runtime, some special considerations were taken to minimize
the impact of the core API. First of all, if FIU_ENABLE is not defined,
then fiu.h will define empty stubs for all the core API, effectively
disabling fault injection completely.
Also, a special header fiu-local.h is shipped with libfiu. It is meant
to be included in your project to avoid having libfiu as a mandatory
build-time dependency. You can add it to your project, and #include it
instead of fiu.h. It will take care of including the real fiu.h only
when FIU_ENABLE is defined. It is entirely optional, but recommended.
See the library’s manual for more details.
Initializes the library. Ideally, you should only call this
once, although it can cope with multiple calls. The flags
parameter is currently unused and must be set to 0. Returns 0 on
success, < 0 on error.
Returns the failure status of the given point of failure. 0
means it should not fail. By default, all points of failure do
not fail; they’re enabled in runtime using the control API.
Returns the information associated with the last failure, or
NULL if there isn’t one.
fiu_do_on(name, action) [macro]
This is a macro that uses fiu_fail() to perform the given action
when the given point of failure fails. The action can be any
valid C statement.
This is a macro that uses fiu_fail() to exit the process when
the given point of failure fails. The process is exit using
exit(3), which is given the status EXIT_FAILURE.
fiu_return_on(name, retval) [macro]
This is a macro that uses fiu_fail() to make the current
function return the given value (whose type obviously depends on
the return type of the function).
To use the control API, you should #include <fiu-control.h>.
fiu_enable(name, failnum, failinfo, flags)
Enables the given point of failure. failnum is what fiu_fail()
will return, and must be != 0. failinfo is what fiu_failinfo()
will return when called after the given point of failure has
failed. flags can be either 0 or FIU_ONETIME, which indicates
that this point of failure should only fail once. Returns 0 if
success, < 0 otherwise. If the point of failure was already
enabled, this overwrites the previous values.
Successive calls to fiu_fail() will return failnum until this
point of failure is disabled. If FIU_ONETIME was passed in the
flags, this point of failure is disabled immediately after
If the name ends with an asterisk, then it this will match all
points of failure that begin with the given name (excluding the
asterisk, of course).
fiu_enable_random(name, failnum, failinfo, flags, probability)
Enables the given point of failure, with the given probability
(between 0 and 1). The rest of the parameters, as well as the
return value, are the same as the ones in fiu_enable().
fiu_enable_external(name, failnum, failinfo, flags, external_cb)
Enables the given point of failure, leaving the decision whether
to fail or not to the given external function, which should
return 0 if it is not to fail, or 1 otherwise. The rest of the
parameters, as well as the return value, are the same as the
ones in fiu_enable().
Disables the given point of failure, undoing the actions of the
Enables remote control over named pipes with the given basename.
See the remote control documentation that comes with the library
for more detail.
If you want to report bugs, or have any questions or comments, just let
me know at email@example.com. For more information about libfiu,
you can go to http://blitiri.com.ar/p/libfiu.