ioctl Pronounciation

ioctl Description

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 system calls. 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 that. Device-independent request codes are sometimes used to give userspace access to kernel functions which are only used by core system software or still under development.

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