Linux Kernel Module Cheat

27.2. C

Programs under userland/c/ are examples of ANSI C programming:

userland/c/empty.c
userland/c/hello.c
main and environment
- userland/c/return0.c
- userland/c/return1.c
- userland/c/return2.c
- userland/c/exit0.c
- userland/c/exit1.c
- userland/c/exit2.c
- userland/c/command_line_arguments.c: print one command line argument per line using argc and argv.
  
  Good sanity check for user mode: QEMU user mode getting started
Standard library
- assert.h
  - userland/c/assert_fail.c
- stdlib.h
  - exit
    
    userland/c/abort.c
- stdio.h
  - userland/c/getchar.c
  - userland/c/snprintf.c
  - userland/c/stderr.c
  - File IO
    
    userland/c/file_write_read.c
    
    userland/c/cat.c: a quick and dirty cat implementation for interactive User mode simulation tests
    
    userland/linux/open_o_tmpfile.c: https://stackoverflow.com/questions/4508998/what-is-an-anonymous-inode-in-linux/44388030#44388030
- time.h
  - userland/c/timespec_get.c timespec_get is a C11 for clock_gettime http://stackoverflow.com/questions/361363/how-to-measure-time-in-milliseconds-using-ansi-c/36095407#36095407
    
    Vs clock(): http://stackoverflow.com/questions/12392278/measure-time-in-linux-getrusage-vs-clock-gettime-vs-clock-vs-gettimeofday
Fun
- userland/c/loop.c