linux-user: fix wait* syscall status returns
When calling wait4 or waitpid with a status pointer and WNOHANG, the syscall can potentially not modify the status pointer input. Now if we have guest code like: int status = 0; waitpid(pid, &status, WNOHANG); if (status) <breakage> then we have to make sure that in case status did not change we actually return the guest's initialized status variable instead of our own uninitialized. We fail to do so today, as we proxy everything through an uninitialized status variable which for me ended up always containing the last error code. This patch fixes some test cases when building yast2-core in OBS for ARM. Signed-off-by: NAlexander Graf <agraf@suse.de> Signed-off-by: NRiku Voipio <riku.voipio@linaro.org>
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