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rust: chardev: provide basic bindings to character devices

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Most of the character device API is pretty simple, with "0 or -errno"
or "number of bytes or -errno" as the convention for return codes.
Add safe wrappers for the API to the CharBackend bindgen-generated
struct.

The API is not complete, but it covers the parts that are used
by the PL011 device, plus qemu_chr_fe_write which is needed to
implement the standard library Write trait.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2025-02-14 12:41:14 +01:00
parent 2ad011d466
commit 2d0050cbe2
3 changed files with 255 additions and 5 deletions
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17
rust/qemu-api/meson.build
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@ -54,7 +54,19 @@ qemu_api = declare_dependency(link_with: _qemu_api_rs)
rust_qemu_api_objs = static_library(
'rust_qemu_api_objs',
objects: [libqom.extract_all_objects(recursive: false),
libhwcore.extract_all_objects(recursive: false)])
libhwcore.extract_all_objects(recursive: false),
libchardev.extract_all_objects(recursive: false),
libcrypto.extract_all_objects(recursive: false),
libauthz.extract_all_objects(recursive: false),
libio.extract_all_objects(recursive: false)])
rust_qemu_api_deps = declare_dependency(
dependencies: [
qom_ss.dependencies(),
chardev_ss.dependencies(),
crypto_ss.dependencies(),
authz_ss.dependencies(),
io_ss.dependencies()],
link_whole: [rust_qemu_api_objs, libqemuutil])
test('rust-qemu-api-integration',
executable(
@ -63,8 +75,7 @@ test('rust-qemu-api-integration',
override_options: ['rust_std=2021', 'build.rust_std=2021'],
rust_args: ['--test'],
install: false,
dependencies: [qemu_api, qemu_api_macros],
link_whole: [rust_qemu_api_objs, libqemuutil]),
dependencies: [qemu_api, qemu_api_macros, rust_qemu_api_deps]),
args: [
'--test', '--test-threads', '1',
'--format', 'pretty',