libcamera::MemFd Class Reference

Helper class to create anonymous files. More...

Public Types
enum	Seal { None = 0, Shrink = (1 << 0), Grow = (1 << 1) }
	Seals for the MemFd::create() function.
using	Seals = Flags< Seal >
	A bitwise combination of MemFd::Seal values.

Static Public Member Functions
static UniqueFD	create (const char *name, std::size_t size, Seals seals=Seal::None)
	Create an anonymous file. More...

Detailed Description

Helper class to create anonymous files.

Anonymous files behave like regular files, and can be modified, truncated, memory-mapped and so on. Unlike regular files, they however live in RAM and don't have permanent backing storage.

Member Function Documentation

create()

UniqueFD libcamera::MemFd::create ( const char *  name, std::size_t  size, Seals  seals = Seal::None  )

static

Create an anonymous file.

Parameters

[in]	name	The file name (displayed in symbolic links in /proc/self/fd/)
[in]	size	The file size
[in]	seals	The file seals

This function is a helper that wraps anonymous file (memfd) creation and sets the file size and optional seals.

Returns

The descriptor of the anonymous file if creation succeeded, or an invalid UniqueFD otherwise

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The documentation for this class was generated from the following files:

• include/libcamera/base/memfd.h
• src/libcamera/base/memfd.cpp