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In computing, ioctl (an abbreviation of input/output control) is a system call for device-specific input/output operations and other operations which cannot be expressed by regular file semantics. It takes a parameter specifying a request code; the effect of a call depends completely on the request code. Request codes are often device-specific. For instance, a CD-ROM device driver which can instruct a physical device to eject a disc would provide an ioctl request code to do so. Device-independent request codes are sometimes used to give usermode access to kernel functions which are only used by core system software or still under development.
In computing, ioctl (an abbreviation of input/output control) is a system call for device-specific input/output operations and other operations which cannot be expressed by regular file semantics. It takes a parameter specifying a request code; the effect of a call depends completely on the request code. Request codes are often device-specific. For instance, a CD-ROM device driver which can instruct a physical device to eject a disc would provide an ioctl request code to do so. Device-independent request codes are sometimes used to give usermdoe access to kernel functions which are only used by core system software or still under development.


See also [https://en.wikipedia.org/wiki/Ioctl wikipedia page about IOCTL].
See also [https://en.wikipedia.org/wiki/Ioctl wikipedia page about IOCTL].
See also [[Devices]] and [https://www.psdevwiki.com/ps5/IOCTL PS5 IOCTL]s.


= Description =
= Description =
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* Thanks to SocraticBliss for the names.
* Thanks to SocraticBliss for the names.
= Finding the IOCTL handler address for a device in kernel =
# Find a string of the device name in kernel.
# There should be only two cross-references from function: make_dev and mutex_init. make_dev is the interesting one.
# The structure before the device string is what we want to look.
# Follow the structure then go to the very last offset of the structure. It is the handler function in charge of IOCTLs for that device.
</pre>


{{Reverse Engineering}}
{{Reverse Engineering}}
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