We need to add _POSIX_C_SOURCE to this file as it uses POSIX values from
limits.h including IOV_MAX, CHILD_MAX and ARG_MAX.
Signed-off-by: Keith Packard <keithp@keithp.com>
It's sort of more conventient to do the opposite of what was
done with the __z_sysconf_ macros, and use them for both the
full implementation and the macro implementation.
Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
Previously, sysconf() was only available as a macro (i.e. the
"extra-small" option).
This has the advantage of being compile-time constant, and
optimized for both space and speed. One disadvantage is that
querying an `_SC_` value that was invalid or unsupported
would result in a compile error.
Provide a "small" implementation of sysconf() (via Kconfig
choice) as a normal addressable function.
Signed-off-by: Christopher Friedt <cfriedt@meta.com>
