EmbLogic » Gopal Sharma https://www.emblogic.com/blog Embedded System and ARM Training Tue, 03 Mar 2020 13:00:06 +0000 en-US hourly 1 http://wordpress.org/?v=3.9.1 char driver ioctl https://www.emblogic.com/blog/04/char-driver-ioctl/ https://www.emblogic.com/blog/04/char-driver-ioctl/#comments Thu, 31 Mar 2016 19:33:03 +0000 http://www.emblogic.com/blog/?p=13468 Continue reading →]]> summary
1-kernel documentation .txt file if not available in path usr/src/kernel/kernel version/documentation
then search online http:kernel.org/doc
2-prototype of unlocked ioctl is in fs.h file
3-_IO _IOR etc is available in path
usr/src/kernel/kernel version/include/uapi/asm-generic -ioctl.h
4.in user space second arrgument of ioctl should be macro of _IO _IOR etc

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