[PATCH] libcamera: dma_buf_allocator: Work around lack of memfd_create() in uClibc

[Laurent Pinchart]

uClibc doesn't provide a memfd_create() implementation. Fix it by using
a direct syscall when the function isn't available.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
I should have bundled this in a series with "[PATCH] libcamera:
dma_buf_allocator: Work around lack of file seals in uClibc", sorry
about that.
---
 src/libcamera/dma_buf_allocator.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/libcamera/dma_buf_allocator.cpp b/src/libcamera/dma_buf_allocator.cpp
index 5ec29949c66a..d7d08e188a62 100644
--- a/src/libcamera/dma_buf_allocator.cpp
+++ b/src/libcamera/dma_buf_allocator.cpp
@@ -13,6 +13,7 @@
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
+#include <sys/syscall.h>
 #include <sys/types.h>
 #include <unistd.h>
 
@@ -132,7 +133,11 @@ UniqueFD DmaBufAllocator::allocFromUDmaBuf(const char *name, std::size_t size)
 	std::size_t pageMask = sysconf(_SC_PAGESIZE) - 1;
 	size = (size + pageMask) & ~pageMask;
 
+#if HAVE_MEMFD_CREATE
 	int ret = memfd_create(name, MFD_ALLOW_SEALING | MFD_CLOEXEC);
+#else
+	int ret = syscall(SYS_memfd_create, name, MFD_ALLOW_SEALING | MFD_CLOEXEC);
+#endif
 	if (ret < 0) {
 		ret = errno;
 		LOG(DmaBufAllocator, Error)

base-commit: 98071d3109c131820439f61d9380c0bd4cd2119a
-- 
Regards,

Laurent Pinchart