Open() Syscall Logic | 32 Bit OS Dev (in C)
10Writing out the rest of open() logic, thinking through it slowly as I go. Really it's only adding to the open inode table and open file table.
There's probably ~5-7 hours after this one sans editing, to create a file successfully from open() without error. I'll try not to be too slow and boring!
Errata:
- O_RDONLY, O_WRONLY, and O_RDWR are later changed to be 0, 1, and 2 respectively, so that only 1 of these can be active at a time.
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Git Repos:
Sourcehut: https://git.sr.ht/~queso_fuego/quesos
Github mirror: https://github.com/queso-fuego/amateuros
Repo state before open() syscall (this will be updated when open() and creating new files is mostly done):
git clone -n https://github.com/queso-fuego/amateuros
cd amateuros
git checkout 4255fe96f1efb69498eec2a55417dd3eca3eb2de
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Next video:
- Adding more helper functions to get inodes, and starting an fs_create_file() function
- Let me know if there's anything specific you'd like to see!
Outline:
0:00 changes since last video
3:36 continue inode_from_path() and syscall_open()
26:13 search & add to open inode table
47:12 add to open file table
1:17:47 wrap up & outro
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#osdev #open #syscall