[PATCH v3 0/3] nolibc: Add getcwd() and readlink()

[Daniel Palmer <daniel@thingy.jp>]

I needed getcwd() for something. So I added that, then realised
I also needed readlink() to test the result of getcwd().

This adds getcwd() and readlink() then adds a test that uses
both.

Note: getcwd() has some behaviour where if the current directory
is unreachable then the kernel returns "(unreachable)" and this
needs some special handling. I checked what musl was doing for
this. It seems pretty difficult to test and maybe needs some
calls nolibc doesn't have yet. Basically: It looks right but
there is no test.

v3:
   - Addressed the issues noted by sashiko (impressed by how good it is now)
   - Use __LINE__ for the error numbers in the test to make it
     easy to spot where it broke.
   - Redid the nolibc test for all archs, all passed.

v2:
   - Addressed Thomas' comments for readlink() and making the test depend on proc.
   - Filled out getcwd() so it matches what musl is doing.
   - Expanded the test a little to try to cover passing bad arguments.

Daniel Palmer (3):
  tools/nolibc: unistd: Add getcwd()
  tools/nolibc: unistd: Add readlink()
  selftests/nolibc: Add test for getcwd() and readlink()

 tools/include/nolibc/unistd.h                | 58 ++++++++++++++++++++
 tools/testing/selftests/nolibc/nolibc-test.c | 53 ++++++++++++++++++
 2 files changed, 111 insertions(+)

-- 
2.53.0