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 sup-
port 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 cre-
ated, 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 "type-
script"..