From d5890ea0722831eea76a0efd23a496b3e8815fe8 Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Wed, 1 Feb 2023 16:10:54 -0500 Subject: util/userfaultfd: Add uffd_open() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a helper to create the uffd handle. Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Juan Quintela Signed-off-by: Peter Xu Signed-off-by: Juan Quintela --- util/userfaultfd.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'util') diff --git a/util/userfaultfd.c b/util/userfaultfd.c index f1cd6af..4953b31 100644 --- a/util/userfaultfd.c +++ b/util/userfaultfd.c @@ -19,6 +19,15 @@ #include #include +int uffd_open(int flags) +{ +#if defined(__NR_userfaultfd) + return syscall(__NR_userfaultfd, flags); +#else + return -EINVAL; +#endif +} + /** * uffd_query_features: query UFFD features * @@ -32,7 +41,7 @@ int uffd_query_features(uint64_t *features) struct uffdio_api api_struct = { 0 }; int ret = -1; - uffd_fd = syscall(__NR_userfaultfd, O_CLOEXEC); + uffd_fd = uffd_open(O_CLOEXEC); if (uffd_fd < 0) { trace_uffd_query_features_nosys(errno); return -1; @@ -69,7 +78,7 @@ int uffd_create_fd(uint64_t features, bool non_blocking) uint64_t ioctl_mask = BIT(_UFFDIO_REGISTER) | BIT(_UFFDIO_UNREGISTER); flags = O_CLOEXEC | (non_blocking ? O_NONBLOCK : 0); - uffd_fd = syscall(__NR_userfaultfd, flags); + uffd_fd = uffd_open(flags); if (uffd_fd < 0) { trace_uffd_create_fd_nosys(errno); return -1; -- cgit v1.1