[libc-commits] [libc] [libc] add statvfs (PR #86169)

[Schrodinger ZHU Yifan via libc-commits]

SchrodingerZhu wrote:

@lntue Do you know that test targets are not created for
```
add_custom_target(libc_sys_statvfs_unittests)

add_libc_unittest(
  statvfs_test
  SUITE
    libc_sys_statvfs_unittests
  SRCS
    statvfs_test.cpp
  DEPENDS
    libc.src.errno.errno
    libc.src.sys.statvfs.linux.statfs_utils
    libc.src.sys.statvfs.statvfs
    libc.test.UnitTest.ErrnoSetterMatcher
)

add_libc_unittest(
  fstatvfs_test
  SUITE
    libc_sys_statvfs_unittests
  SRCS
    fstatvfs_test.cpp
  DEPENDS
    libc.src.errno.errno
    libc.src.sys.statvfs.linux.statfs_utils
    libc.src.sys.statvfs.fstatvfs
    libc.src.fcntl.open
    libc.src.unistd.close
    libc.src.__support.CPP.string_view
    libc.test.UnitTest.ErrnoSetterMatcher
)

```

https://github.com/llvm/llvm-project/pull/86169