drewdevault

drewdevault, 19 days ago

@whynothugo not especially trying to innovate just yet, we'll see

drewdevault, 19 days ago

many process, much wait

drewdevault, 19 days ago

@mxk what is sync_fd()? Do you mean fsync?

drewdevault, 19 days ago

@mxk I haven't implemented fsync and presently all writes are committed to disk before write(2) et al returns to userspace, so I'm not sure. I might know more when I get to that.

drewdevault, 19 days ago

@mxk @bugaevc I made it so that you can only open directories with O_DIRECTORY and they can only be O_RDONLY

drewdevault, 19 days ago

@bugaevc @mxk I guess that makes sense. We'll see what people are doing in the wild when I start porting software and it trips over this

drewdevault, 19 days ago

Okay, about done for today. Summary of day 14 writing a Unix clone:

New syscalls: exit, waitpid

Improvements to openat: enforces read/write mode, supports O_DIRECTORY, O_APPEND, O_TRUNC, O_EXCL, and O_CLOEXEC

Added an inode cache

Optimized the MMU code for fork and process clean-up (still no CoW, though)

And laid some groundwork for signals, which I have been dreading from the start.

https://git.sr.ht/~sircmpwn/bunnix

drewdevault, 18 days ago

initramfs :D

Simon Zeni ported the Helios EFI bootloader to the Bunnix boot protocol last night, so I'm doing some other boot improvements this morning to get EFI support upstreamed

drewdevault, 18 days ago

drewdevault, 18 days ago

EFI w/framebuffer console via GOP

drewdevault, 18 days ago

Left: old thinkpad w/legacy boot
Right: modern starlabs starbook MkIV w/EFI boot

Both booted from the same flash drive :)

drewdevault, 18 days ago

EFI support ended up consuming all of day 15. D&D tonight!

drewdevault, 17 days ago

Day 16: I am porting musl libc to Bunnix

drewdevault, 17 days ago

Wiring up more of stdio.h

drewdevault, 17 days ago

End of day 16:

• New syscall: fstatat (currently AT_EMPTY_PATH only, i.e. fstat(2) behavior)
• Serious build system improvements, to add...
• A sysroot during the build, into which...
• An early port of musl libc has been installed, including varying degrees of support for stdio, math, complex, ctype, malloc, string, unistd, stat, and more

Unfortunately I'm now fully committed to GNU make, but this build is too complex to really get away with POSIX makefiles.

drewdevault, 17 days ago

Goal for the end of the week is to have a pretty decent C environment with a shell and a decent spread of coreutils ported, probably a bourne shell derivative plus sbase.

I'll port DOOM, too, if all of that is done before Saturday.

drewdevault, 17 days ago

Fleshed out libc a tiny bit more and tried to port some sbase utilities before calling it quits for today

drewdevault, 17 days ago

drewdevault, 16 days ago

Another day, another GCC cross compiler

drewdevault, 16 days ago

"success"

drewdevault, 16 days ago

So, in the morning of day 17, I have three languages running in userspace: Hare, C, and C++

I will keep fleshing out libc and the necessary syscalls until we have a shell. I suspect there is another scheduler bug as well.

Coming up soon: pipe(2), dup(2), fcntl(2)

drewdevault, 16 days ago

@yrlf libstdc++

drewdevault, 16 days ago

@lritter nope

drewdevault, 16 days ago

@lritter well, everything is cross-compiled. It's not self-hosting yet

drewdevault, 16 days ago

pipe(2)