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# sources
- [Kbuild object variable name rationale][kbuild-obj-var]
- [Kbuild kernel module setup guide][kbuild-module-makefile]
- [`struct file_operations`][c-struct-file-operations] documentation, also
- write(2)
- read(2)
- (Sadly) [the Linux kernel source][kernel] itself, especially
- drivers/char/random.c
- drivers/char/mem.c
[kbuild-obj-var]: https://docs.kernel.org/kbuild/makefiles.html#loadable-module-goals-obj-m
[kbuild-module-makefile]: https://www.kernel.org/doc/html/latest/kbuild/modules.html#creating-a-kbuild-file-for-an-external-module
[c-struct-file-operations]: https://www.kernel.org/doc/html/latest/filesystems/vfs.html#struct-file-operations
[kernel]: https://github.com/torvalds/linux
# tips
- When the kernel documentation references manpages, these actually contain
useful information. Manpages are not only for commands, but also include
detailed documentation for the syscall interface and other C APIs.
Since most of the manpages referenced by the kernel are from section 2 (on
system calls), you should append the number between brackets to the `man`
command, i.e. to read 'write(2)' use the command `man 2 write`.
- Use `dmesg` with the `-w` or `-W` option (see man dmesg(1))
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