Laboratory 1

Due Date: April 20, 1999
Points: 100

1. (20 points) Write a program to determine the maximum number of simultaneous processes that MINIX will support for a single user. Once this number is determined, any processes created to compute this number are to be terminated. Don't forget that the user's shell is itself a process!
   Hint: Spawn processes until the fork fails. To terminate these processes, keep track of their PIDs as they are created, and use signals.
2. (20 points) The FreeBSD command stat prints information about a file in the following format:

   File: "/"
     Size: 1024    Allocated Blocks: 2     Filetype: Directory
     Mode: (0755/drwxr-xr-x)       Uid: (0/root) Gid: (0/wheel)
   Device: 132096  Inode: 2        Links: 28
   Access: Thu Apr  1 22:56:24 1999
   Modify: Thu Apr  1 12:08:59 1999
   Change: Thu Apr  1 12:08:59 1999
   

   Please implement this command for MINIX.
3. (20 points) Write a program to print the numeric and symbolic names of any signals it receives. For example, if I send the process a signal 1, it should print:

   Thu Apr 1 23:34:19 1999 Received signal 1 (SIGHUP)
   

   The program should not attempt to catch signal 9 (SIGKILL).
4. (40 points) Write a program script that spawns a shell, and records all input to the shell and output from the shell into a file named "typescript". If your program is given an argument, use that to name the file rather than "typescript".