THINK-PRO BLOG

/* tokenize the 'string' with a deliminator " ",
   returns how many arguments in 'string' */
int get_argument_count(const char * string)
{
  char * new_string = (char *)malloc(sizeof(char)*(strlen(string)+1));
  strlcpy(new_string, string, strlen(string)+1);

  char *token, *save_ptr;
  int i=0;
  for(token=strtok_r(new_string, " ", &save_ptr); token;
      token=strtok_r(NULL, " ", &save_ptr))
  {
    i++;
  }
  free(new_string);
  return i;
}

/* tokenize the 'parse' with a deliminator " ",
   each arguments will be saved into the 'esp'. */
void argument_stack(char ** parse, int count, void ** esp)
{
/* parse = sentence including 'process and arguments'
   count = argc(argument counts) through 'GetArgumentCount' func.
   esp = &if_.esp */

  char * command_line = *parse; // like 'echo x y z'

  char * fn_copy;
  fn_copy = palloc_get_page(PAL_USER);
  if(fn_copy == NULL)
    thread_exit();
  strlcpy(fn_copy, command_line, PGSIZE);

  char * token, * save_ptr;
  int i=0;
  int * variable_index = (int *)malloc(sizeof(int)*count);

  for(token = strtok_r(fn_copy, " ", &save_ptr); token;
      token = strtok_r(NULL, " ", &save_ptr))
  {
    printf("'%s'\n", token);
    variable_index[i++] = token - fn_copy;
  }

  int size = strlen((char*)(*parse));

  *esp -= size + 1;
  int command_position = (int)*esp; // stack pointer position for command line

  for(i=0; i<=size; i++)
  {
    *(char*)(*esp) = fn_copy[i];
    *esp += 1;
  }
  *esp = (int)command_position;

  *esp -= ((int)(*esp)%4<0? (int)(*esp)%4+4 : (int)(*esp)%4);
  *esp -= 4;
  *(int*)(*esp) = 0;

  // argv[1,2,3,...]: arguments
  for(i=count-1; i>=0; i--)
  {
    *esp -= 4;
    *(void**)(*esp) = command_position + variable_index[i];
  }

  // argv[0]: process_name
  *esp -= 4;
  *(char **)(*esp) = (*esp + 4);
  // argc: argument count
  *esp -= 4;
  *(int *)(*esp) = count;
  // return address - fake (0)
  *esp -= 4;
  *(int*)(*esp) = 0;

  free(variable_index);
}

1. Command Line Parsing

2. System Call

3. Hierarchical Process Structure

4. File Description

5. Alarm System Call

6. Priority Scheduling and Synchronization

7. Priority Inversion Problem

8. Virtual Memory

9. Memory Mapped File

10. Swapping

11. Buffer Cache

12. Extensible File

13. Subdirectory

$ cd ~ // 홈 디렉토리에 bochs 파일을 압축 해제. 원하는 경로로 설정하세요.

$ tar xvf bochs-2.6.2.tar.gz

$ ./configure --enable-gdb-stub --with-nogui

$ make

$ sudo make install

※ "C compiler cannot create executables" 오류가 난다면

$ sudo apt-get install libc6-dev g++ gcc 

※ "X windows libraries were not found" 오류가 난다면

$ sudo apt-get install xorg-dev

※ 그 외 오류의 경우 gcc 버전이 호환되지 않는 경우가 많습니다.

gcc 버전을 다운그레이드하세요.

$ sudo apt-get install gcc-4.6

$ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.6 50

$ tar xvf pintos.tar.gz

$ vi ~/.bashrc

$ source ~/.bashrc // 이는 환경설정을 등록하는 명령어임.

$ cd pintos/src/threads

$ make

$ cd build

$ pintos -- run alarm-multiple