Unix Systems Programming: Lab 3

README

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2. Before starting, please reviews lecture3 note carefully, for each part of lab, there is also specified reading assignment;
3. Please pay attention to "DELIVERABLES" instruction in each part;
4. Turn the lab assignment in by email to the grader by the due date above.
5. Read "make and Makefile" session in Chaper 8 of BLP textbook if you're using that text.  Certainly refer to the online GNU documentation for GNU make.

LAB 3

1. Implement the stat command in C. Write a C program called my_stat that implements the default behavior of the UNIX stat command.  Your output should exactly match the default output of the stat command.  For instance:
   
   File: "/usr/bin/stat"
   Size: 7212          Blocks: 16         IO Block: 4096   Regular File
   Device: 303h/771d    Inode: 311082      Links: 1   
   Access: (0755/-rwxr-xr-x)  Uid: (    0/    root)   Gid: (    0/    root)
   Access: Wed Jul 10 23:00:30 2002
   Modify: Wed Aug  8 10:49:41 2001
   Change: Thu Apr  4 12:34:28 2002
   
   Hint: "man stat" and "man 2 stat".  Again, the output of your stat program with the option should match the output of the original stat program.  For those of you using Molay's text, you will find his discussion on the stat call on pages 82ff quite helpful in using the stat call and formatting the output correctly.

   For extra credit (2 points): Implement handling of any one of the following two flags:
   -L (follow Links)
   -c --format (implement a subset of 5 of the formatting options (your choice which 5))

   DELIVERABLES: your source file(s) (e.g., my_stat.c), a makefile, and a README as described in the submission faq

2. Implement a simplified version of the UNIX program "cp" , which copies one file to another. Call the file filecopy.c.  This version copies only files, it does not permit the second argument to be a directory. We also ignore all options in command "filecopy".

   Please follow these steps:

   • Read chapter 3 in the BLP textbook carefully, or chapter 2 of Molay if you're using that text.
   • Read and understand these examples: read.c and write.c; (man 2 read; man 2 write if necessary)
   • Use Low-level File Access functions such as creat, open, read, write, close, etc.) to implement this command
   • You must handle the situation when the second argument is the same as the first, i.e., you should not allow a file to be copied over itself.  Handle this situation intelligently.
   • Acctually, you only need to integrate above examples and add only serveral lines.

   DELIVERABLES: your source file(s) (e.g., filecopy.c), a makefile, and a README as described in the submission faq

3. MARKS DISTRIBUTION

   1. Excercise 1:
   • 8 points: implementation
   
   
   • 2 points: correct results after running the implementation
   
   
   
   
   2. Excercise 2:
   • 8 points: implementation
   
   
   • 2 points: correct results after running the implementation
   
   
   
   
   3. Correct Submission:
   • 3 points: correctly submitting parts 1,2
   (Please see proper submission guidelines)
   
   • 2 point: code comments to show that you know what you are doing
   
   
   
   Total Marks: 25

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   Atilla Soner Balkir