From 48cb731d72e2bc54d3bf76eb35c6644fa2f924f2 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Wed, 5 Jun 2024 10:34:17 +0300
Subject: libcamera: dma_buf_allocator: Work around lack of file seals in
uClibc
uClibc doesn't provide the macros defining parameters for the file
sealing API. Define them manually as a work around.
Fixes: ea4baaacc325 ("libcamera: DmaBufAllocator: Support allocating from /dev/udmabuf")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
---
meson.build | 4 ++++
src/libcamera/dma_buf_allocator.cpp | 8 ++++++++
2 files changed, 12 insertions(+)
diff --git a/meson.build b/meson.build
index 1902ea2f..0ef4cdaa 100644
--- a/meson.build
+++ b/meson.build
@@ -74,6 +74,10 @@ cc = meson.get_compiler('c')
cxx = meson.get_compiler('cpp')
config_h = configuration_data()
+if cc.has_header_symbol('fcntl.h', 'F_ADD_SEALS', prefix : '#define _GNU_SOURCE')
+ config_h.set('HAVE_FILE_SEALS', 1)
+endif
+
if cc.has_header_symbol('unistd.h', 'issetugid')
config_h.set('HAVE_ISSETUGID', 1)
endif
diff --git a/src/libcamera/dma_buf_allocator.cpp b/src/libcamera/dma_buf_allocator.cpp
index d7d08e18..c06eca7d 100644
--- a/src/libcamera/dma_buf_allocator.cpp
+++ b/src/libcamera/dma_buf_allocator.cpp
@@ -127,6 +127,14 @@ DmaBufAllocator::~DmaBufAllocator() = default;
* \return True if the DmaBufAllocator is valid, false otherwise
*/
+/* uClibc doesn't provide the file sealing API. */
+#ifndef __DOXYGEN__
+#if not HAVE_FILE_SEALS
+#define F_ADD_SEALS 1033
+#define F_SEAL_SHRINK 0x0002
+#endif
+#endif
+
UniqueFD DmaBufAllocator::allocFromUDmaBuf(const char *name, std::size_t size)
{
/* Size must be a multiple of the page size. Round it up. */
--
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