https://homeostasis.scs.carleton.ca/wiki/index.php?action=history&feed=atom&title=Operating_Systems_2019F_Lecture_12 2026-05-18T21:41:55Z Revision history for this page on the wiki MediaWiki 1.42.1 https://homeostasis.scs.carleton.ca/wiki/index.php?title=Operating_Systems_2019F_Lecture_12&diff=22517&oldid=prev 2019-10-11T21:51:49Z

<p>Created page with &quot;==Video== Video of the lecture given on October 11, 2019 [https://homeostasis.scs.carleton.ca/~soma/os-2019f/lectures/comp3000-2019f-lec12-20191011.m4v is now available]. ==...&quot;</p> <p><b>New page</b></p><div>==Video==<br /> <br /> Video of the lecture given on October 11, 2019 [https://homeostasis.scs.carleton.ca/~soma/os-2019f/lectures/comp3000-2019f-lec12-20191011.m4v is now available].<br /> <br /> ==Notes==<br /> <br /> [https://homeostasis.scs.carleton.ca/~soma/os-2019f/solutions/assign2-sol.txt Assignment 2 solutions]<br /> <br /> &lt;pre&gt;<br /> Midterm study guide<br /> <br /> * environment variables<br /> - how they work<br /> - where they are in memory<br /> * wait<br /> - when it waits<br /> - when it doesn&#039;t<br /> - what it really is for<br /> * I/O redirection<br /> - how to do it<br /> * umask<br /> - how it affects open calls, which kinds (when you create a file)<br /> * system calls versus library calls (open, opendir, etc)<br /> - how the names aren&#039;t always the same<br /> * tty&#039;s and standard in/out/error, /proc/&lt;PID&gt;/fd<br /> * signal handlers<br /> - how to define<br /> - when called<br /> - interrupting system calls<br /> * cd, working directory<br /> * globbing, who does it<br /> * UNIX pipes basics<br /> * hard links versus symbolic links<br /> * object files versus executable files<br /> * inodes<br /> - permissions<br /> - times<br /> * where local vars, funciton arguments, global vars, stack, heap, environment/command line args are all in a process&#039;s memory relative to each other<br /> * process creation, running programs (fork, execve, exit, wait)<br /> * 3000copy (mmap &amp; rw), sequence of operations<br /> <br /> <br /> Difference between base pointer (%rbp) and the stack pointer (%rsp) registers.<br /> * stack pointer is used to maintain the stack, is automatically changed by<br /> instructions like call and ret<br /> * base pointer register is good for doing relative addressing<br /> - so good for accessing local variables and parameters<br /> &lt;/pre&gt;</div>

Soma