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mirror of https://github.com/hsoft/collapseos.git synced 2024-12-26 03:38:06 +11:00
collapseos/apps
Virgil Dupras 942d2a952d ed: take filename as an argument
This hard-binds ed to the filesystem (I liked the idea of working
only with blockdevs though...), but this is necessary for the
upcoming `w` command. We need some kind of way to tell the
destination to write to truncate itself.

This only has a meaning in the filesystem, but it's necessary to
let the file know that its registered file size has possibly
shrunk.

I thought of alternatives that would have allowed me to keep ed
blkdev-centered, but they were all too hackish to my own taste.

Hence, this new hard-bind on files.
2019-07-20 19:43:07 -04:00
..
at28w apps/at28w: fix argument byte order 2019-06-14 21:11:45 -04:00
ed ed: take filename as an argument 2019-07-20 19:43:07 -04:00
lib ed: add support for 'a' and 'i' 2019-07-14 17:35:21 -04:00
memt apps/memt: new app 2019-06-16 20:53:21 -04:00
sdct sdc: support 24-bit addressing 2019-06-15 13:41:20 -04:00
zasm zasm: fix bug with registry selection 2019-07-20 18:07:52 -04:00
README.md Make userspace parse args the same way the shell does 2019-06-02 14:05:20 -04:00

User applications

This folder contains code designed to be "userspace" application. Unlike the kernel, which always stay in memory. Those apps here will more likely be loaded in RAM from storage, ran, then discarded so that another userspace program can be run.

That doesn't mean that you can't include that code in your kernel though, but you will typically not want to do that.

Userspace convention

We execute a userspace application by calling the address it's loaded into. This means: a userspace application is expected to return.

Whatever calls the userspace app (usually, it will be the shell), should set HL to a pointer to unparsed arguments in string form, null terminated.

The userspace application is expected to set A on return. 0 means success, non-zero means error.