Lab 3 - IDA

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<strong>Lab</strong> 3: Exec, Exit and Wait Child (pid1) Parent exit( 0 ) ; // the child exits with the exit code 0 execution wait execution system call Wait / sema_down exit_code = wait(pid1) ; // the parent waits for a child process exit Signal / sema_up waiting wait: get the exit_code execution Note that a parent can have several children! exit 18
<strong>Lab</strong> 3: Part B • Sometimes we want to pass arguments to programs – insult s 17 • In C programs: argc and argv – argv[0] : name of the program (“insult”) – argv[1] : first argument (“-s”) – argv[2] : second argument (“17”) – argc : number of arguments plus one (3) – argv[argc] = NULL : Required by the C standard • Your task: put arguments on the stack when a program is loaded. 19
Page 1 and 2: TDDB68 2011 Lesson 2 Pintos Assignm
Page 3 and 4: Instead of Motivation • Some of y
Page 5 and 6: Lab 3: overview • Part A - Multip
Page 7 and 8: Exec & wait example: src/examples/s
Page 9 and 10: Part A Lab 3: Exec • pid_t exec (
Page 11 and 12: Lab 3: Exec Starting the child Pare
Page 13 and 14: Lab 3: Situations with Wait • Chi
Page 15 and 16: Lab 3: Situations with Wait • Chi
Page 17: Reference counting “poor man's ga
Page 21 and 22: Lab 3: Part B • Every time you do
Page 23 and 24: Lab 3 (B): Program arguments • ST
Page 25 and 26: Address Name Data Type 0xbffffffd a
Page 27 and 28: Lab 3 : Part C • Part C: Making t
Page 29 and 30: Bad string argument • User progra
Page 31 and 32: Lab 3 : Pointer paranoia Memory val
Page 33 and 34: Lab 4: General Description • Lab
Page 35 and 36: Lab 4: Files (2) • devices/disk.[
Page 37 and 38: Lab 4: Additional System Calls •
Page 39 and 40: Lab 4: Final Tests • For testing

Lab 3 - IDA

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