libnl currently uses strerror_r() throughout, but this is
problematic because there is a non-standard GNU version
implemented in glibc, and the standard POSIX version, which
differ in signature. When using glibc, one can choose
between the two versions using feature test macros
_GNU_SOURCE and _POSIX_C_SOURCE.
Given libnl is built using the former, we always get the
glibc special version, and all code so far has been written
for that non-standard version.
Other C libraries like musl on the other hand only try
to be posix compliant, and only ever provide the posix
version of strerror_r(), which has a different signature.
The alternative is to use strerror_l() rather than
strerror_r() http://austingroupbugs.net/view.php?id=655
- this will avoid the non-confirming versions issue
- strerror_l() is now recommended by POSIX to replace
strerror_r() usage
So rather than changing all uses of strerror_r() to be in
line with posix, we are going to switch to the recommended
interface strerror_l().
Since strerror_l() is slightly more difficuly to use, we
add a little (private) wrapper that we can use from all
current callsites of strerror_r().
Signed-off-by: André Draszik <adraszik@tycoint.com>
Reviewed-by: Stephane Ayotte <sayotte@tycoint.com>
Signed-off-by: Thomas Haller <thaller@redhat.com>
Davide Caratti