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Add support and CI tests for BSDs

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This adds a fallback using `shm_open`/`shm_unlink` for platforms where
`memfd_create` doesn't exist. This seems to be how this is normally
handled, though it's a bit ugly.

This also builds the wayland/x11 code for NetBSD/OpenBSD/DragonFlyBSD.

Add CI builds for FreeBSD and NetBSD. We would need some kind of
virtualisation though to actually run tests on such targets.

I've tested the `shm_open` logic on Linux, but haven't run it on any
BSDs.
This commit is contained in:
Ian Douglas Scott 2022-12-22 10:13:32 -08:00
parent afe6da235b
commit 4f6542ceaa
4 changed files with 112 additions and 16 deletions
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50
src/wayland/buffer.rs
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@ -1,4 +1,3 @@
use nix::sys::memfd::{memfd_create, MemFdCreateFlag};
use std::{
ffi::CStr,
fs::File,
@ -15,6 +14,50 @@ use wayland_client::{
use super::State;
#[cfg(any(target_os = "linux", target_os = "freebsd"))]
fn create_memfile() -> File {
use nix::sys::memfd::{memfd_create, MemFdCreateFlag};
let name = unsafe { CStr::from_bytes_with_nul_unchecked("softbuffer\0".as_bytes()) };
let fd = memfd_create(name, MemFdCreateFlag::MFD_CLOEXEC)
.expect("Failed to create memfd to store buffer.");
unsafe { File::from_raw_fd(fd) }
}
#[cfg(not(any(target_os = "linux", target_os = "freebsd")))]
fn create_memfile() -> File {
use nix::{
errno::Errno,
fcntl::OFlag,
sys::{
mman::{shm_open, shm_unlink},
stat::Mode,
},
};
use std::iter;
for _ in 0..=4 {
let mut name = String::from("softbuffer-");
name.extend(iter::repeat_with(fastrand::alphanumeric).take(7));
name.push('\0');
let name = unsafe { CStr::from_bytes_with_nul_unchecked(name.as_bytes()) };
// `CLOEXEC` is implied with `shm_open`
let fd = shm_open(
name,
OFlag::O_RDWR | OFlag::O_CREAT | OFlag::O_EXCL,
Mode::S_IRWXU,
);
if fd != Err(Errno::EEXIST) {
let fd = fd.expect("Failed to create POSIX shm to store buffer.");
let _ = shm_unlink(name);
return unsafe { File::from_raw_fd(fd) };
}
}
panic!("Failed to generate non-existant shm name")
}
pub(super) struct WaylandBuffer {
qh: QueueHandle<State>,
tempfile: File,
@ -28,10 +71,7 @@ pub(super) struct WaylandBuffer {
impl WaylandBuffer {
pub fn new(shm: &wl_shm::WlShm, width: i32, height: i32, qh: &QueueHandle<State>) -> Self {
let name = unsafe { CStr::from_bytes_with_nul_unchecked("softbuffer\0".as_bytes()) };
let tempfile_fd = memfd_create(name, MemFdCreateFlag::MFD_CLOEXEC)
.expect("Failed to create memfd to store buffer.");
let tempfile = unsafe { File::from_raw_fd(tempfile_fd) };
let tempfile = create_memfile();
let pool_size = width * height * 4;
let pool = shm.create_pool(tempfile.as_raw_fd(), pool_size, qh, ());
let released = Arc::new(AtomicBool::new(true));