[libcamera-devel] [RFC PATCH v1 02/12] libcamera: file_descriptor: Add a function to retrieve the inode
Laurent Pinchart
laurent.pinchart at ideasonboard.com
Thu Sep 2 06:22:53 CEST 2021
The inode is useful to check if two file descriptors refer to the same
file. Add a function to retrieve it.
Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
include/libcamera/file_descriptor.h | 3 +++
src/libcamera/file_descriptor.cpp | 22 ++++++++++++++++++++++
2 files changed, 25 insertions(+)
diff --git a/include/libcamera/file_descriptor.h b/include/libcamera/file_descriptor.h
index d514aac7697b..988f9b7a3d25 100644
--- a/include/libcamera/file_descriptor.h
+++ b/include/libcamera/file_descriptor.h
@@ -8,6 +8,7 @@
#define __LIBCAMERA_FILE_DESCRIPTOR_H__
#include <memory>
+#include <sys/types.h>
namespace libcamera {
@@ -27,6 +28,8 @@ public:
int fd() const { return fd_ ? fd_->fd() : -1; }
FileDescriptor dup() const;
+ ino_t inode() const;
+
private:
class Descriptor
{
diff --git a/src/libcamera/file_descriptor.cpp b/src/libcamera/file_descriptor.cpp
index 9f9ebc81f738..d55e2b100b6d 100644
--- a/src/libcamera/file_descriptor.cpp
+++ b/src/libcamera/file_descriptor.cpp
@@ -8,6 +8,8 @@
#include <libcamera/file_descriptor.h>
#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
#include <unistd.h>
#include <utility>
@@ -221,6 +223,26 @@ FileDescriptor FileDescriptor::dup() const
return FileDescriptor(fd());
}
+/**
+ * \brief Retrieve the file descriptor inode
+ *
+ * \todo Should this move to the File class ?
+ *
+ * \return The file descriptor inode on success, or 0 on error
+ */
+ino_t FileDescriptor::inode() const
+{
+ if (!fd_ || fd_->fd() == -1)
+ return 0;
+
+ struct stat st;
+ int ret = fstat(fd_->fd(), &st);
+ if (ret < 0)
+ return 0;
+
+ return st.st_ino;
+}
+
FileDescriptor::Descriptor::Descriptor(int fd, bool duplicate)
{
if (!duplicate) {
--
Regards,
Laurent Pinchart
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