How processes get more memory. (mmap, brk)

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We've all called malloc to get more memory for our programs, but what is REALLY happening when we call malloc? This video goes under the hood and shows you how a computer process (running computer program) gets more memory from the operating system.
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Welcome! I post videos that help you learn to program and become a more confident software developer. I cover beginner-to-advanced systems topics ranging from network programming, threads, processes, operating systems, embedded systems and others. My goal is to help you get under-the-hood and better understand how computers work and how you can use them to become stronger students and more capable professional developers.
About me: I'm a computer scientist, electrical engineer, researcher, and teacher. I specialize in embedded systems, mobile computing, sensor networks, and the Internet of Things. I teach systems and networking courses at Clemson University, where I also lead the PERSIST research lab.
More about me and what I do:
people.cs.clemson.edu/~jsorber/
persist.cs.clemson.edu/ Note that any Amazon links in my video descriptions are generated by Amazon. If you click one of them and then buy something it helps support this channel. Thanks.
***
Welcome! I post videos that help you learn to program and become a more confident software developer. I cover beginner-to-advanced systems topics ranging from network programming, threads, processes, operating systems, embedded systems and others. My goal is to help you get under-the-hood and better understand how computers work and how you can use them to become stronger students and more capable professional developers.
About me: I'm a computer scientist, electrical engineer, researcher, and teacher. I specialize in embedded systems, mobile computing, sensor networks, and the Internet of Things. I teach systems and networking courses at Clemson University, where I also lead the PERSIST research lab.
More about me and what I do:
www.jacobsorber.com
people.cs.clemson.edu/~jsorber/
persist.cs.clemson.edu/
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[@akj7]

You should have also mentioned what malloc actually writes into the memory, which is why free doesn't need a size.

[@odaialkhodary7872]

I just stumbled upon one of your videos, and man, I went down a rabbit hole with your excellent guidance! Your explanations are so clear and thorough; Thanks for breaking down complex concepts into digestible bits. Your passion for teaching really shines through, and it's making a huge difference in my understanding. Keep up the fantastic work!

[@anshumansingh6252]

What a crisp and clean explanation! I am impressed man. Thanks a ton.

[@SRedienhcs]

Awesome! I've been looking for a good presentation of this topic for days. Subscribed!

[@gowthamanv8740]

Your way of presentation Awesome. Keep doing more videos. I subscribed.

[@qaiyyumhakimi7947]

Your way of explaining things is one of the best that i've found on youtube! Thumbs Up!

[@mhanna2]

Found this helpful and enjoyable, thank you!

[@WatchTower71]

Holy dang dude, you’re literally the most knowledgeable person about C libraries I’ve seen on UA-cam! You should be a teacher or something. Great videos, please keep em coming!

[@RegularObamahedron]

Clean presentation!

[@nupurgupta6373]

amazing information , please more videos on mmap

[@saurabhshrivastava224]

Great brother. Keep on doing more..

[@shushens]

This is a fantastic video. One of the best you made yet. Strangely, it is one of the videos I watched last.

[@lllbenderlll]

please don't stop.

[@gonzajuarez4918]

hello, been really enjoying your videos and learning a lot. i've got a question though: should we use munmap once we finished? kinda like free() is used after malloc(). and if so, is it the same for brk/sbrk (like can sbrk called to shrink or does it have a shrinking counterpart). I've done a bit of strace and found than munmap is in fact called by free() but haven't seen a counterpart with brk sbrk (or something like calling sbrk with a negative number perhaps as two's complement of the initially allocated memory)

[@MrUmang40]

You are my life savior......your every teaching helps me move a step ahead....you came late on UA-cam.....but at least you came......love you sir.....

[@OretYT]

Great video

[@kathiravankathir3089]

your profile is awesome

[@44r0n-9]

This video is perfect.

[@ruynobrega6918]

Great content, as always. If you can answer me: could you explain how actual RAM dump actually works? I always wondered that bc of the Program Break.

[@majdwatad]

Thanks for the video