os: add an ability to lock memory on_fault
This will be used in the following commits to make it possible to only
lock memory on fault instead of right away.
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Link: https://lore.kernel.org/r/20250212143920.1269754-2-d-tatianin@yandex-team.ru
[peterx: fail os_mlock(on_fault=1) when not supported]
[peterx: use G_GNUC_UNUSED instead of "(void)on_fault", per Dan]
Signed-off-by: Peter Xu <peterx@redhat.com>
diff --git a/meson.build b/meson.build
index 18cf9e2..59953cb 100644
--- a/meson.build
+++ b/meson.build
@@ -2885,6 +2885,12 @@
return mlockall(MCL_FUTURE);
}'''))
+config_host_data.set('HAVE_MLOCK_ONFAULT', cc.links(gnu_source_prefix + '''
+ #include <sys/mman.h>
+ int main(void) {
+ return mlockall(MCL_FUTURE | MCL_ONFAULT);
+ }'''))
+
have_l2tpv3 = false
if get_option('l2tpv3').allowed() and have_system
have_l2tpv3 = cc.has_type('struct mmsghdr',