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Full Discussion: Chardev.c
Operating Systems Linux Chardev.c Post 302777803 by Corona688 on Friday 8th of March 2013 11:48:19 AM
Old 03-08-2013
In short, a kernel module is a list of functions. When the device is opened, it calls your kernel module's own personal open() function. When the device is read from, it calls your kernel module's own personal read() function. You give them private names like device_open and device_read, and tell the kernel which one is close() by filling out the right values in the file_operations structure.

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LDP(7)							 Miscellaneous Information Manual						    LDP(7)

NAME
LDP - Intro to the Linux Documentation Project, with help, guides and documents SYNOPSIS
The Linux Documentation Project (LDP) provides a variety of free documentation resources including guides, FAQs, HOWTOs, and man-pages to the Linux community. AUTHORS
The various documents in the LDP archives are maintained by individual authors, and are listed in the beginning of each HOWTO. If you have any questions or inputs to a document we encourage you to contact the authors directly. WEB PAGES
The LDP has its own dedicated web site as do many of the various translations projects which are linked from the main LDP web site at: http://www.tldp.org/ MAN PAGES
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Most distributions include the HOWTOs and mini-HOWTOs in the installation /usr/doc/ (old place for documentation) /usr/share/doc/ (new place for documentation) /usr/share/doc/HOWTO/ (HOWTO files) /usr/share/doc/HOWTO/mini/ (mini-HOWTO files) SEE ALSO
info(1), man(1), xman(1x) info pages as read with emacs(1) or info(1) LDP
2001-11-15 LDP(7)
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