CS 3733 Operating Systems, Spring 2004 Assignment 3 Comments

For those who said it was working, I mainly looked at the code for the last part.

Here are some general comments:

• For the server, you only need to read in the program list once.
• I gave an outline of how to check for valid program lines in a file that has been read into memory. See my comments for Assignment 1 on the web.
• For the server, to read the program list into memory, use readblock or read_file. A single call to read or r_read is not sufficient.
• For the server, do not try tto read the entire program into memory. If this is a video file it might be several gigabytes. That is why you were told to use send_num_bytes.
• Do not use malloc to do a single allocation of 2 bytes.
• It is not necessary to call free right before exit.
• Several ways to do send_int_as_line:
  Not too good:

          char buf[60];
          sprintf(buf,"%d\n",num);
       

  better:

          #define BUFSIZE 60
          char buf[BUFSIZE];
          sprintf(buf,"%d\n",num);
       

  still better (avoids Y2K-like problem):

          #define BUFSIZE 60
          char buf[BUFSIZE];
          if (snprintf(buf,BUFSIZE,"%d\n",num) >= BUFSIZE)
             return -1;