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fuchsia / fuchsia / 6697568849879512cc8452e84c2db4c0da200466 / . / src / proc / bin / starnix
tree: 3b94a28802f0a5912e0da73fc7d7bbf37afeca58 [path history] [tgz]
  1. fixtures/
  2. meta/
  3. BUILD.gn
  4. decision-log.md
  5. executive.rs
  6. loader.rs
  7. main.rs
  8. README.md
  9. syscall_table.rs
  10. syscalls.rs
  11. uapi.rs
src/proc/bin/starnix/README.md

Starnix

Starnix is a component that runs Linux binaries on Fuchsia. Currently, starnix is highly experimental and can run only trivial programs.

How to run starnix

Currently, we require a x86_64 host Linux system to run starnix.

Add starnix to core.cml

In order to make starnix available in the system, we need to add starnix to the core component by adding the following line to //src/sys/core/meta/core.cml, directly above the children declaration:

    include: [ "src/proc/bin/starnix/meta/core.shard.cml" ],

Configure your build

In order to run starnix, we need to build //src/proc:

$ fx set core.x64 --with-base //src/proc,//src/proc:tests
$ fx build

Run Fuchsia

Run Fuchsia as normal, for example using fx serve and fx emu -N.

To monitor starnix, look for log messages with the starnix tag:

fx log --tag starnix

Run a Linux binary

To run a Linux binary, ask starnix to start a component that wraps the binary:

$ ffx starnix start fuchsia-pkg://fuchsia.com/hello_starnix#meta/hello_starnix.cm

If this is the first time you've used the ffx starnix command, you might need to configure ffx to enable the starnix commands. Attempting to run the start command should provide instructions for enabling the starnix commands.

If everything is working, you should see some log messages like the following:

[00064.846853][33707][33709][starnix, starnix] INFO: main
[00064.847640][33707][33709][starnix, starnix] INFO: start_component: fuchsia-pkg://fuchsia.com/hello_starnix#meta/hello_starnix.cm

Run a Linux test binary

Linux test binaries can be run using the starnix test runner. This can be done using the standard fx test command:

$ fx test hello-starnix-test --output

You should see output like:

Running test 'fuchsia-pkg://fuchsia.com/hello-starnix-test#meta/hello_starnix_test.cm'
[RUNNING]       fuchsia-pkg://fuchsia.com/hello-starnix-test#meta/hello_starnix_test.cm
[PASSED]        fuchsia-pkg://fuchsia.com/hello-starnix-test#meta/hello_starnix_test.cm

In the device logs you should see output like:

[starnix, starnix_runner] INFO: main
[starnix, starnix_runner] INFO: start_component: fuchsia-pkg://fuchsia.com/hello-starnix-test#meta/hello_starnix_test.cm
[starnix, strace] INFO: 1(0x1, 0x35a3ca6000, 0xe, 0x0, 0x0, 0x0)
[starnix, starnix_runner::syscalls] INFO: write: hello starnix

[starnix, strace] INFO: -> 0xe
[starnix, strace] INFO: 60(0x0, 0x35a3ca6000, 0xe, 0x0, 0x0, 0x0)
[starnix, starnix_runner::syscalls] INFO: exit: error_code=0
[starnix, strace] INFO: -> 0x0