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iSH works differently. It’s not running “Linux” and it isn’t virtualizing hardware either. Anything you run has to be compiled already and the syscalls are emul

iSH works differently. It’s not running “Linux” and it isn’t virtualizing hardware either. Anything you run has to be compiled already and the syscalls are emulated, there is no Linux kernel in iSH.

lazerl0rd 7y ago
I said it was a 'usermode Linux "terminal" emulator', never said it was a VM or anything like that. IIRC the dev said he also wasn't allowed to publish it to the App Store and I assume it falls under the same catagory of "not allowed" in Apple's eyes as UTM would've had.
- saagarjha 7y ago
  > I said it was a 'usermode Linux "terminal" emulator', never said it was a VM or anything like that. It's a full x86 emulator. > IIRC the dev said he also wasn't allowed to publish it to the App Store He didn't, it's just never been tested whether it could be on the store or not.
  - jedieaston 7y ago
    Actually, someone compiled it, added ads, and put it on the App Store. Not sure if it is still there, but it got through approval.
    - saagarjha 7y ago
      Oh, that happens all the time. The real test is when the official app gets approved and stays on the App Store.
kdrag0n 7y ago
iSH actually uses a semi-JIT to emulate an x86 CPU — it doesn't run ARM64 code. It basically creates an arrray of function pointers to snippets of pre-translated code. It's not a full JIT like UTM, but it's an interesting workaround for iOS' restrictions. Official description: https://github.com/tbodt/ish#a-note-on-the-jit https://github.com/tbodt/ish#a-note-on-the-jit
- saagarjha 7y ago
  A more accurate term for it would be threaded interpretation.
saagarjha 7y ago
> Anything you run has to be compiled already You can compile binaries on iSH and they'll run on the emulator just as all the other code does.
- jsjohnst 7y ago
  Compile using what? It’s form of emulation has never been complete enough to run a compiler (heck even interpreters like Python have been very brittle) in my experience as a user since the beginning, so I’m curious what you’ve seen success with.
  - saagarjha 7y ago
    GCC works reasonably well.
    - jsjohnst 7y ago
      Interesting, thx for the reply. I haven’t tried GCC in the last few updates, so will try again. Edit: just tried it and indeed you are right, it works in a few cases now. Clang also works for basic test cases.

lazerl0rd 7y ago

I said it was a 'usermode Linux "terminal" emulator', never said it was a VM or anything like that. IIRC the dev said he also wasn't allowed to publish it to the App Store and I assume it falls under the same catagory of "not allowed" in Apple's eyes as UTM would've had.

saagarjha 7y ago
> I said it was a 'usermode Linux "terminal" emulator', never said it was a VM or anything like that. It's a full x86 emulator. > IIRC the dev said he also wasn't allowed to publish it to the App Store He didn't, it's just never been tested whether it could be on the store or not.
- jedieaston 7y ago
  Actually, someone compiled it, added ads, and put it on the App Store. Not sure if it is still there, but it got through approval.
  - saagarjha 7y ago
    Oh, that happens all the time. The real test is when the official app gets approved and stays on the App Store.

kdrag0n 7y ago

iSH actually uses a semi-JIT to emulate an x86 CPU — it doesn't run ARM64 code. It basically creates an arrray of function pointers to snippets of pre-translated code. It's not a full JIT like UTM, but it's an interesting workaround for iOS' restrictions. Official description: https://github.com/tbodt/ish#a-note-on-the-jit https://github.com/tbodt/ish#a-note-on-the-jit

saagarjha 7y ago
A more accurate term for it would be threaded interpretation.

saagarjha 7y ago

> Anything you run has to be compiled already You can compile binaries on iSH and they'll run on the emulator just as all the other code does.

jsjohnst 7y ago
Compile using what? It’s form of emulation has never been complete enough to run a compiler (heck even interpreters like Python have been very brittle) in my experience as a user since the beginning, so I’m curious what you’ve seen success with.
- saagarjha 7y ago
  GCC works reasonably well.
  - jsjohnst 7y ago
    Interesting, thx for the reply. I haven’t tried GCC in the last few updates, so will try again. Edit: just tried it and indeed you are right, it works in a few cases now. Clang also works for basic test cases.