tree 2e4b4d17ddc7e9f3ee839f8a78dc56a2949d5f6d
parent e2792004580e42b86345d141493b1f12ba358fd8
author Marc-André Lureau <marcandre.lureau@redhat.com> 1444403839 +0200
committer Michael S. Tsirkin <mst@redhat.com> 1445513688 +0300

util: add linux-only memfd fallback

Implement memfd_create() fallback if not available in system libc.
memfd_create() is still not included in glibc today, atlhough it's been
available since Linux 3.17 in Oct 2014.

memfd has numerous advantages over traditional shm/mmap for ipc memory
sharing with fd handler, which we are going to make use of for
vhost-user logging memory in following patches.

The next patches are going to introduce helpers to use best practices of
memfd usage and provide some compatibility fallback. memfd.c is thus
temporarily useless and eventually empty if memfd_create() is provided
by the system.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Thibaut Collet <thibaut.collet@6wind.com>