### Process control
- fork()
- exec()
- wait()
- exit()
- getpid()
- getpriority()
- setpriority()
- kill()
### Task/Thread control
- task_create
- task_join
- task_detach
- task_destory
- task_mutex_lock
- task_mutex_unlock
### Memory Control
- malloc
- free
- mmap()
- munmap()
### File/Device Control
- create()
- open()
- read()
- write()
- ioctl()
- stat()
- close()
- rename()
- link()
- delete/unlink()
- chmod()
- chown()
### Time Control
- usleep()
- time()