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ioctl

The ioctl system call is an all-purpose interface for controlling hardware devices.
- The first argument to ioctl is a file descriptor, which should be opened to the device that you want to control.
- The second argument is a request code that indicates the operation that you want to perform.
The http://siber.cankaya.edu.tr/SystemsProgramming/cfiles/cdrom-eject.cprogram in Fig. 6.16 presents a short program that ejects the disk in a CD-ROM drive (if the drive supports this).

Figure 6.16: Eject a CD-ROM.
$\begin{figure}\begin{center} \small \begin{verbatim}...$
```
$ ./cdrom-eject /dev/hdc
```

**Figure 6.16:** Eject a CD-ROM.
$\begin{figure}\begin{center} \small \begin{verbatim}...$

Cem Ozdogan 2007-05-16