Module os::syscall::process

Process management syscalls

Structs

• TaskInfo
  Task information
• TimeVal

Functions

• sys_exec
• sys_exit
  task exits and submit an exit code
• sys_fork
• sys_get_time
  YOUR JOB: get time with second and microsecond HINT: You might reimplement it with virtual memory management. HINT: What if TimeVal is splitted by two pages ?
• sys_getpid
• sys_mmap
  YOUR JOB: Implement mmap.
• sys_munmap
  YOUR JOB: Implement munmap.
• sys_sbrk
  change data segment size
• sys_set_priority
• sys_spawn
  YOUR JOB: Implement spawn. HINT: fork + exec =/= spawn
• sys_task_info
  YOUR JOB: Finish sys_task_info to pass testcases HINT: You might reimplement it with virtual memory management. HINT: What if TaskInfo is splitted by two pages ?
• sys_waitpid
  If there is not a child process whose pid is same as given, return -1. Else if there is a child process but it is still running, return -2.
• sys_yield
  current task gives up resources for other tasks