Maybe mx_object_get_property(mx_process_self(), MX_PROP_NAME, name, sizeof(name)) ?

Or is this stashed elsewhere?

I didn't see anything promising looking in __libc_start_main.c. __environ is close, but I can't get to argv[0] from there I don't think.

Ideally I guess, both the current .so and the main binary, but I'll take whichever.

Pointer bug at MG-797.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1ab7aa8f394ec33c1fd775adbd34f22907cdae05

commit 1ab7aa8f394ec33c1fd775adbd34f22907cdae05
Author: scottmg <scottmg@chromium.org>
Date: Thu May 25 05:22:49 2017

fuchsia: add base_paths_fuchsia.cc

I was going to use base_paths_posix.cc originally but it's already a big chain
of #ifdefs, and there's no XDG on Fuchsia, so it didn't seem that helpful.

BUG=706592, 726124 

Review-Url: https://codereview.chromium.org/2907473002
Cr-Commit-Position: refs/heads/master@{#474563}

[modify] https://crrev.com/1ab7aa8f394ec33c1fd775adbd34f22907cdae05/base/BUILD.gn
[add] https://crrev.com/1ab7aa8f394ec33c1fd775adbd34f22907cdae05/base/base_paths_fuchsia.cc
[modify] https://crrev.com/1ab7aa8f394ec33c1fd775adbd34f22907cdae05/base/base_paths_posix.cc
[modify] https://crrev.com/1ab7aa8f394ec33c1fd775adbd34f22907cdae05/base/path_service.cc
[modify] https://crrev.com/1ab7aa8f394ec33c1fd775adbd34f22907cdae05/base/path_service_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/crashpad/crashpad.git/+/741a84a2987fd57c709d069d4cafdfe68b719332

commit 741a84a2987fd57c709d069d4cafdfe68b719332
Author: Scott Graham <scottmg@chromium.org>
Date: Tue Dec 05 18:59:26 2017

fuchsia: Add runner, get crashpad_test_test building and running

- Implement build/run_tests.py to run on Fuchsia device
- Implement paths_fuchsia.cc using standard Fuchsia namespace layout
- Exclude multiprocess tests, currently unimplemented
- Don't use unnecessary O_ flags on Fuchsia in open() call.

Bug: crashpad:196,  chromium:726124 , ZX-797
Change-Id: Ie59dce685b4c3fe54f3e36f357c1101d402ee8b7
Reviewed-on: https://chromium-review.googlesource.com/802180
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>

[modify] https://crrev.com/741a84a2987fd57c709d069d4cafdfe68b719332/build/run_tests.py
[modify] https://crrev.com/741a84a2987fd57c709d069d4cafdfe68b719332/test/BUILD.gn
[modify] https://crrev.com/741a84a2987fd57c709d069d4cafdfe68b719332/test/test_paths.cc
[modify] https://crrev.com/741a84a2987fd57c709d069d4cafdfe68b719332/util/BUILD.gn
[modify] https://crrev.com/741a84a2987fd57c709d069d4cafdfe68b719332/util/file/file_io_posix.cc
[add] https://crrev.com/741a84a2987fd57c709d069d4cafdfe68b719332/util/misc/paths_fuchsia.cc

The full path to the binary is constant if the binary is loaded from a package.

Marking bug as obsolete.