IPC-101

Very simple Inter Process Communication via character device driver to help people who want to run Android Binder-like IPC implementation

Author

• Jaebaek Seo (jaebaek@kaist.ac.kr)

simpleDD

• In the directory, you can check out the file hello.c and Makefile
• Build

$ make

• Test

$ sudo insmod hello.ko
$ lsmod
$ cat /dev/kmsg # this shows kernel message (i.e., `output of printk()`)
$ sudo rmmod hello
$ cat /dev/kmsg

simpleMsgDD

• msg.c support sending and receiving message from a thread to another thread.

  • Note that it is very simple one (e.g., vulnerable to race condition, no multiple message support).

• test.c save a string to the device driver and read the string from the device driver.

• Build

$ make
$ gcc test.c

• Test

$ sudo mknod /dev/simple_msg_dd c 250 0 # 250 is the major number used for register_chrdev()
$ sudo insmod hello.ko
$ lsmod
$ cat /dev/kmsg # this shows kernel message (i.e., `output of printk()`)
$ sudo ./a.out
$ cat /dev/kmsg
$ sudo rmmod hello
$ cat /dev/kmsg
$ sudo rm /dev/simple_msg_dd