1. What's cc? (Steps and what does each step do)

2. Given a C program, which is run as   a.out this is a test
        int g;
        int h = 1;

        main(int argc, char *argv[]) |     int A( int x, ......)
        {                            |     {                            
           int a,b,c;                |        int u,v;
           a = 2;                    |
           b = 3;                    |     HERE:       
           c = A(a,b,"hello");       |
        }                            |     }

   (1). Complete the function heading of A(....)
   (2). Which variables are global? which are local?   
   (3). Which variables are in a.out?
   (4). Execution is at HERE:  DRAW A DIAGRAM TO Show 
        the stack contents from HERE to main()'s argc and argv.

3.Given: printu(unsigned int x), which prints an UNSIGNED integer.
  Write C code to print a SIGNED integer (which may be negative).

4. Assignment #2: YOUR printf(char *fmt, ...) is written as
                         {
                            char *cp; 
                            int  *ip;
                            ..........
                         }
     which may be called as 

           printf("abc %c xyz %s any %d thing %x\n", a,b,c,d);

(1). Write C code to let cp point to the fmt string       _____________
(2). Write C code to let ip point to the first parameter a _______________
(3). HOW do you print each of the items a,b,c,d?

Notes: List Processing and LAB #2


5. Write C statements for a struct containing

     name      : an array of 32 chars
     key       : an integer
     child     : pointer to the first child node
     sibling   : pointer to the next sibling node
     parent    : pointer to the parent node

A tree is implemented as a BINARY tree by the child and sibling pointers.

Assume: struct node *p  points at a node A.
        Write C code to print all children of A.

        struct node *q  points at a new node.
        Write C code to add q as a child of A.

Given:
                           0     1     2    3   4    5     6    7 
int (*fptr[ ])(char *) = {menu, mkdir,rmdir,ls, cd, pwd, creat, rm};

Write C code to call the function  create(char *pathname)
Notes: Process Management in Unix
LAB3 : Sh Simulator


6. Given: PATH=/bin:/usr/bin: .... :/usr/locl/bin:./
   Write C code to tokenize PATH into separate dir strings
7. what does   int pid = fork()    do? 
   after fork(); HOW TO TELL whether it's the parent or the child executing?

   What does     int wait(int *status)  do?
   What does  int   r = execve("pathname", argv, env);    do?
   How does the system find pathname?__________________________________

   Assume the Linux cat is in /bin directory.
   When running YOUR sh with  cat file1 file2 file3 > outfile
    
8. Write C code to do output redirection > 
   For the above commnad line  cat file1 file2 fie3 > outfile:

   Draw a diagram to show exactly what's YOUR myargv in the
     
       r = execve("/bin/cat", myargv, env) call?_________________________

   What's the value of r?  ____________
9. Write C code to do pipe in the command line
           cat filename | grep line
10. Relationship betwee   open,  close, read  write
                         fopen  fclose fread  fwrite

11. Given: struct stat myst.  myst.st_mode, myst.st_atime

    Write C code to get information of a filename:

    Write C code to determine whether filename is a REGular file or a DIRectory.

    Write C code to test whether
            the file is Writeable by Others:____________________________
                        Readable  by Others:____________________________

    
    Write C code to print the file's access time in CALENDAR form.

12. Write C code to print the names of all entries in the current directory.

13. Fill in blanks for OPEN a file for read mode:
    _______ fd = open("file", _______);
     
    _______ fp = fopen("file", _______); 
     char buf[4096];
(a). Write C code to read 4K bytes into buf[] using fd: ______________________
(b). Write C code to read 4K bytes into buf[] using fp: ______________________

Which of (a) and (b) is faster? WHY? _________________________________________
    

14. Use system calls to display the contents of a file:______________________

    use Library I/O functions to dispaly the contents of a file:_____________ 

15. Given: cpf2f(char *f1, char *f2) copies REG file f1 to REG file f2.

    Write C code to copy a REG file /a/b/c into a DIRectory /x/y/z ___________
 

16. Write C code to test whether /a/b/c and /x/y/z are the SAME file:_________