Transcript Project 1
Project 1 • ASSIGNED: Tuesday, January 29th, 2002 •DUE DATE: Wednesday, February 13th, 2002 at 5pm - project1.c, project1, and project1.out should be in your ~/cop4600/src/tools directory - Hand in your report to Prof. Davis in class on Thursday - DO NOT touch your files after 5pm. We will check the timestamp. We will send you an email when it is safe to access your files again. Unix Basics Command Description Example cd Change directory cd ~/cop4600 ls List directory ls -la mkdir Make directory mkdir backup rm Remove file rm *.c rmdir Remove directory rmdir backup man Online manual (help) man ls chmod Change mode (access rights) chmod 750 * grep Search for text in file grep printf *.c find Search for files find ./ -name “my.c” ©Mark Conner Unix Basics Command Description Example ps Process status (list) ps –u $USER kill Terminate process kill –9 3291 pwd Print working directory pwd mv Move (or rename) file/directory mv p1.c project1.c cp Copy file cp p1.c p1.bak more Display text file a page at a time more project1.c pico Simple text editor pico +20 project1.c emacs Advanced (graphical) text editor emacs project1.c diff Compare files diff p1.c project1.c ©Mark Conner Minix Basics Command Description Example minix Start Minix operating system minix sunread Read file from Solaris OS sunread p1 > p1 chmod Change mode (permissions) chmod +x p1 halt Shutdown (exit) Minix halt minix_setup Create Minix files/directories minix_setup minix_DESTROY Remove Minix files/dirs minix_DESTROY minix_backup Backup Minix files minix_backup minix_diff Compare Minix to original minix_diff > report mlogin Open another Minix window mlogin $USER ©Mark Conner Minix Basics Command Description Example minix_cleanup Remove dead Minix processes minix_cleanup mcc Compile (for Minix) mcc p1.c –o p1 ©Mark Conner Project 1 Banking/Atm problem General Idea – Each atm process reads an account number and value from a file and sends this info to the bank process – The bank process gets the info and makes the changes in the appropriate account. – This continues until the entire files have been read by the atms. Project 1 There are three kinds of processes – 1 root – 1 bank – N atms (0 < N < 7) There are also N pipes, 1 for each atm to communicate to the bank. Project 1 Root process – Take command line parameter (# of atms) – Create pipes – Create bank & atms – Wait for all children to exit Project 1 CORRECT! Root Bank N atms Project 1 WRONG!!! Bank and Atms Root Project 1 Atms – Open from appropriate file (atm0 uses atm0.txt, atm1 – – – – uses atm1.txt, etc). Get account number and transaction amount from file. Send transaction to bank Repeat until EOF returned, then send a transaction with account number –1 to bank and exit Hint: It might be useful to use fopen() and fscanf() to open and get the info from the file. Project 1 Bank – Check all pipes in order to see if empty or not. – If not empty, read transaction from pipe and update appropriate account balance. – Repeat until all –1 account numbers have been received then exit. Project 1 A few things to note: – The bank & atm processes are executing in pseudoparallel. – Read man pages on minix system calls type “man fork” or “man –s2 fork” – Read Minix User Guide on web page. Explains how to compile, sunread, and run a file in Minix. Project 1 Requirements – All processes must close both ends of all unused pipes – Print all activities – Error Checking Command line parameter System calls C library calls Project 1 Programming Style – Modular – Global and local variables – Constants – Readability – Comments, comments, and more comments Project 1 Compiling and running file in Minix In Solaris – mcc project1.c –o project1 – minix In Minix – Login as “root” – sunread project1 > project1 – chmod +x project1 – project1 Project 1 Questions?