October 2017
Intermediate to advanced
586 pages
14h 8m
English
Content preview from Linux Device Drivers Development
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The ioctl method
A typical Linux system contains around 350 system calls (syscalls), but only a few of them are linked with file operations. Sometimes devices may need to implement specific commands that are not provided by system calls, and especially the ones associated with files and thus device files. In this case, the solution is to use input/output control(ioctl), which is a method by which you extend a list of syscalls (actually commands) associated with a device. You can use it to send special commands to devices (reset, shutdown, configure, and so on). If the driver does not define this method, the kernel will return an -ENOTTY error to any ioctl() system call.
In order to be valid and safe, an ioctl command needs to be identified ...
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