Dear All, I have developed a kernel module consists of one source file that sends and receives message to the user space. I have spitted the source code in two files, and now I am trying to develop kernel module from these source files. After compiling and linking without any problems, I insmod the module but I didn’t see any of the printk() I wrote, in fact, the module can be inserted and removed, but it does nothing. Code is in the attached file zipped file. I tried many things , e.g., link <https://paguilar.org/?p=7>1, link2 <https://www.linuxquestions.org/questions/linux-kernel-70/kernel-module-with-...>, and link3 <https://android.googlesource.com/kernel/msm/+/android-msm-dory-3.10-kitkat-w...> etc. but nothings worked out. I also used *nm* to inspect the module, but, as expected, there was no signs of "__init and __exit" functions can in the output. U __alloc_skb 00000000000001c0 T create_socket 0000000000000030 T data_update U __fentry__ U fortify_panic 0000000000000000 r __func__.5058 U init_net 0000000000000000 t kernel_space_receiver 0000000000000080 T kernel_space_sender U memcpy 0000000000000038 r __module_depends 0000000000000008 D msg_size U msleep U __netlink_kernel_create U netlink_kernel_release U netlink_unicast 0000000000000078 B nlh U __nlmsg_put 0000000000000080 B nl_sk 0000000000000000 r _note_6 0000000000000004 D pid U printk 0000000000000000 D res 0000000000000000 B s_data 0000000000000070 B skb_out U __stack_chk_fail U strlen 0000000000000000 D __this_module 0000000000000000 r __UNIQUE_ID_license381 000000000000004d r __UNIQUE_ID_name240 0000000000000041 r __UNIQUE_ID_retpoline241 0000000000000010 r __UNIQUE_ID_srcversion242 0000000000000068 r __UNIQUE_ID_vermagic239 -------------------- *Following is the output of some useful commands:* ------------------------------------------------- *ssd@ssd:~/Desktop/Kernel_User_comm$ ls* Makefile netlink_kernel_module.c netlink_kernel_space.c netlink_kernel_space.h netlink_user_module.c --------------------------------------------------- *ssd@ssd:~/Kernel_User_comm$ make --version* GNU Make 4.1 Built for x86_64-pc-linux-gnu Copyright (C) 1988-2014 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. ------------------------------------------------------- *ssd@ssd:~/Kernel_User_comm$ uname -r* 5.2.0-rc6 -------------------------------------------------------- Can you please help me: what's the problem/mistake I am doing? Thank you very much. -- *Best Regards,* *Mr. Irfan Ullah* PhD Candidate Data and Knowledge Engineering(DKE) Lab Department of Computer Science and Engineering Kyung Hee University, South Korea. +82-010-591-51651 <+82%2010-3877-8867> sahibzada.iu@gmail.com sahibzada_irfanullah