[LTP] [RFC PATCH 0/1] brk: use direct syscalls

[Teo Couprie Diaz]

Hello LTP maintainers,

This patch slightly reworks the brk01 and brk02 tests to use direct
syscalls with tst_syscall rather than calling through the libc.

While running LTP on a musl-based distribution, we noticed that the brk
tests were failing. It turns out that Musl prevents the use of brk
with their wrapper: it always returns an error.
This isn't too egregious as using brk is deprecated in favor of malloc
and it isn't part of POSIX anymore since POSIX.1-2001, but it _is_
different from glibc's beavior, which allows using it.

This patch allows proper testing of brk's functionality, independent of
libc specifics, and thus allows the tests to pass on Musl-based
distributions like Alpine.

Do you think this is a correct approach for LTP ?
>From what I could see there are a few tests that use tst_syscall directly
and it doesn't affect the logic much for brk.

Green build:
https://github.com/Teo-CD/ltp/actions/runs/3563193507

This was discovered in the context of the Morello project[0].
[0]: https://www.morello-project.org/

Teo Couprie Diaz (1):
  syscalls/brk: use direct syscall

 testcases/kernel/syscalls/brk/brk01.c | 15 ++++++---------
 testcases/kernel/syscalls/brk/brk02.c | 14 ++++++--------
 2 files changed, 12 insertions(+), 17 deletions(-)


base-commit: 498247917f40b0a82cb149e2ec1cb518acd7b632
-- 
2.25.1