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dnl #
dnl # User namespaces, use kuid_t in place of uid_t
dnl # where available. Not strictly a user namespaces thing
dnl # but it should prevent surprises
dnl #
AC_DEFUN([ZFS_AC_KERNEL_KUIDGID_T], [
AC_MSG_CHECKING([whether kuid_t/kgid_t is available])
ZFS_LINUX_TRY_COMPILE([
#include <linux/uidgid.h>
], [
kuid_t userid __attribute__ ((unused)) = KUIDT_INIT(0);
kgid_t groupid __attribute__ ((unused)) = KGIDT_INIT(0);
],[
ZFS_LINUX_TRY_COMPILE([
#include <linux/uidgid.h>
], [
kuid_t userid __attribute__ ((unused)) = 0;
kgid_t groupid __attribute__ ((unused)) = 0;
],[
AC_MSG_RESULT(yes; optional)
],[
AC_MSG_RESULT(yes; mandatory)
AC_DEFINE(HAVE_KUIDGID_T, 1, [kuid_t/kgid_t in use])
])
],[
AC_MSG_RESULT(no)
])
])
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