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1. Jan Schaumann (jschauma@mstdn.social)'s status on Tuesday, 26-Nov-2024 15:58:02 UTC Jan Schaumann

   Advanced #Programming in the #UNIX Environment

   Side-quest: what does this program return?

   ```
   int main() {
   printf("Hello World!\n");
   }
   ```

   The answer, as they say, may surprise you...

   https://www.netmeister.org/blog/return-printf.html

   #apue

   • Jan Schaumann (jschauma@mstdn.social)'s status on Tuesday, 26-Nov-2024 15:57:59 UTC Jan Schaumann

     in reply to

     Advanced #Programming in the #UNIX Environment

     Week 6, Process Control

     In the last video lecture for this week, we look at process control: how new processes are started from an executable, what resources are shared between parent and child, and what happens when they terminate. In particular, we will look at the fork(2), exec(3), and wait(2) system calls. Be warned, though: there will be #zombies, so limber up (Rule #7).

     https://youtu.be/KJq5nTCFsIg

     #apue

   • Jan Schaumann (jschauma@mstdn.social)'s status on Tuesday, 26-Nov-2024 15:57:59 UTC Jan Schaumann

     in reply to

     Advanced #Programming in the #UNIX Environment

     Week 6 related link: #Linux x86 Program Start Up or - How the heck do we get to main()?

     Compare to what we covered in Segment 2 of this week.

     http://dbp-consulting.com/tutorials/debugging/linuxProgramStartup.html

     #apue

   • Jan Schaumann (jschauma@mstdn.social)'s status on Tuesday, 26-Nov-2024 15:58:00 UTC Jan Schaumann

     in reply to

     Advanced #Programming in the #UNIX Environment

     Week 6, Process Limits and Identifiers

     Having looked at the process layout in memory, how it starts and is terminated, we now learn that certain properties are restricted via resource limits, specified as a "soft" and a "hard" limit, with only the superuser being able to raise the latter.

     A process also has a process ID (PID) and a parent process ID (PPID). More
     on these process relationships in our next videos.

     https://youtu.be/bnki8QKjSfQ

     #apue

   • Jan Schaumann (jschauma@mstdn.social)'s status on Tuesday, 26-Nov-2024 15:58:01 UTC Jan Schaumann

     in reply to

     Advanced #Programming in the #UNIX Environment

     Week 6, The Environment (a tangent from 2011)

     How large can the environment get? Is there a limitation on the size of a single environment variable? And why did I sometimes encounter this error message:

     sudo: unable to execute <command>: success

     https://www.netmeister.org/blog/sudo-unable-to-execute.html

     #apue

   • Jan Schaumann (jschauma@mstdn.social)'s status on Tuesday, 26-Nov-2024 15:58:02 UTC Jan Schaumann

     in reply to

     Advanced #Programming in the #UNIX Environment

     Week 6, The Environment

     We're going to take a look at the process environment, using what we learned about the process layout in memory to understand how the environment variables are stored and, if necessary, moved around. We'll also get a quick look at what malloc(3) does.

     https://youtu.be/8DEPA6nJXNY

     #apue