techomancer · techomancer · Jul 2, 2026 · Jun 30, 2026 · Jun 30, 2026 · Jun 30, 2026
diff --git a/Cargo.toml b/Cargo.toml
@@ -110,7 +110,7 @@ cranelift-jit        = { version = "0.116", optional = true }
 cranelift-module     = { version = "0.116", optional = true }
 cranelift-native     = { version = "0.116", optional = true }
 target-lexicon       = { version = "0.13",  optional = true }
-libchdman-rs = { version = "0.287.0-l7", features = ["prebuilt"], optional = true }
+libchdman-rs = { version = "0.288.9", features = ["prebuilt"], optional = true }
 pcap = { version = "2", optional = true }
 shared_memory = { version = "0.12", optional = true }
 raw_sync      = { version = "0.1",  optional = true }

diff --git a/LICENSE-GPL3.txt b/LICENSE-GPL3.txt
diff --git a/LICENSE-libchdman-rs.txt b/LICENSE-libchdman-rs.txt
@@ -0,0 +1,58 @@
+Third-party license — CHD disk-image backend
+=============================================
+
+The optional `--features chd` build links the `libchdman-rs` crate, a Rust
+wrapper around MAME's CHD (Compressed Hunks of Data) core. As of
+libchdman-rs 0.288.8 the crate and the CHD core files it vendors are
+distributed under the BSD 3-Clause License (the same family as IRIS itself),
+so enabling CHD support no longer subjects the combined binary to the GPL.
+
+The MAME project as a whole is distributed under GPL-2.0-or-later, but that is
+an aggregate license. The specific CHD core files vendored and compiled by
+libchdman-rs each carry an individual `// license:BSD-3-Clause` SPDX header,
+and the bundled compression codecs are likewise permissive (zlib and
+Zstandard — BSD-3-Clause, libFLAC — BSD-3-Clause, LZMA — Public Domain,
+utf8proc — MIT).
+
+--------------------------------------------------------------------------------
+libchdman-rs (Rust wrapper + prebuilt static archives)
+  https://github.com/danifunker/libchdman-rs
+  https://crates.io/crates/libchdman-rs
+
+BSD 3-Clause License
+
+Copyright (c) 2026 Dani Sarfati (danifunker)
+
+--------------------------------------------------------------------------------
+MAME CHD core (vendored and compiled by libchdman-rs)
+
+BSD 3-Clause License
+
+Copyright (c) Aaron Giles and the MAME contributors
+
+--------------------------------------------------------------------------------
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/README.md b/README.md
@@ -130,6 +130,10 @@ Without this feature, attempting to mount a `.chd` path returns an
 `Unsupported` error; raw images and COW overlays continue to work as
 before.
 
+The CHD backend (`libchdman-rs` >= 0.288.8) and the MAME CHD core it vendors
+are BSD-3-Clause licensed, so enabling this feature keeps IRIS fully
+BSD-3-Clause (see `LICENSE-libchdman-rs.txt`).
+
 See [HELP.md](HELP.md) for the full rundown: serial ports, monitor console,
 NVRAM/MAC address setup, disk image prep, and more.
 
@@ -427,7 +431,12 @@ first. It'll save you a few days.
 
 ## License
 
-BSD 3-Clause
+BSD 3-Clause (`LICENSE`).
+
+The optional `--features chd` build links `libchdman-rs` (>= 0.288.8), which —
+along with the MAME CHD core it vendors — is also BSD 3-Clause, so CHD builds
+stay fully BSD 3-Clause. See `LICENSE-libchdman-rs.txt` for that third-party
+notice.
 
 ## Whodunnit?
 

diff --git a/docs/cow-chd-sync-plan.md b/docs/cow-chd-sync-plan.md
@@ -136,7 +136,7 @@ only the sync *presentation* differs per frontend.
 - How MAME does writable CHDs (the model we follow): compressed CHD → read-only,
   writes go to an uncompressed differencing CHD (`.dif`) with the original as
   parent; never auto-merged. Uncompressed CHD → in place.
-- `libchdman-rs` (pinned `0.287.0-l7`, `prebuilt`) already provides everything
+- `libchdman-rs` (pinned `0.288.8`, `prebuilt`) already provides everything
   in-process (no shelling to `chdman`):
   - `HdImage::open(path)` — writable in place; **succeeds only for uncompressed**.
   - `HdImage::open_with_diff(parent, diff)` — open parent read-only, create an

diff --git a/docs/pcap-release-plan.md b/docs/pcap-release-plan.md
@@ -16,7 +16,7 @@ release-wiring work to completion.
 
 The build-pipeline files exist **only** on the fork's `main` branch:
 `release.yml`, `appstore.yml`, `sync-upstream.yml`, and vendored build-only files
-(e.g. `LICENSE-GPL3.txt`). They are **not** on `add-pcap-builds` and we must
+(e.g. the generated `COMBINED-LICENSE.txt`). They are **not** on `add-pcap-builds` and we must
 **not** merge `origin/main` to pull them in.
 
 Work therefore splits by file type:
@@ -218,7 +218,7 @@ can verify locally (build/logic); 🧪 = needs your hands-on test on that OS.
 
 ## Licensing summary (clean except Windows-Npcap)
 
-- IRIS core: **BSD-3-Clause** (`LICENSE`; `LICENSE-GPL3.txt` is for the CHD path, orthogonal).
+- IRIS core: **BSD-3-Clause** (`LICENSE`). The CHD path (`libchdman-rs` >= 0.288.8 and the MAME CHD core it vendors) is also **BSD-3-Clause** — see `LICENSE-libchdman-rs.txt`. (Earlier `0.287.0-l7` builds were GPL-3.0 via `LICENSE-GPL3.txt`; no longer required.)
 - `pcap` crate: **MIT OR Apache-2.0**.
 - libpcap (Linux/macOS): **BSD-3-Clause** — bundle in AppImage / depend in deb/rpm; ships in macOS.
 - Windows **Npcap**: proprietary, **redistribution forbidden** — never bundle; user installs it.

diff --git a/installer/iris-gui.iss b/installer/iris-gui.iss
@@ -20,11 +20,24 @@
   #define AssetsDir "..\iris-gui\assets\icons"
 #endif
 
-; Combined BSD-3 + GPL-3 license file (generated by CI, or pass manually).
+; Combined license file (generated by CI, or pass manually). IRIS and the CHD
+; backend are both BSD-3-Clause as of libchdman-rs 0.288.8.
 #ifndef LicenseFile
   #define LicenseFile "..\COMBINED-LICENSE.txt"
 #endif
 
+; Target architecture of the bundled iris-gui.exe. CI passes /DTargetArch=x64 or
+; /DTargetArch=arm64; the installer then refuses to run on the wrong arch (the
+; payload is arch-specific). Maps to the Inno Setup architecture identifiers.
+#ifndef TargetArch
+  #define TargetArch "x64"
+#endif
+#if TargetArch == "arm64"
+  #define ArchIdentifier "arm64"
+#else
+  #define ArchIdentifier "x64compatible"
+#endif
+
 #define MyAppName "IRIS"
 #define MyAppPublisher "Dani Sarfati"
 #define MyAppURL "https://github.com/danifunker/iris"
@@ -40,6 +53,10 @@ AppPublisherURL={#MyAppURL}
 AppSupportURL={#MyAppURL}
 AppUpdatesURL={#MyAppURL}/releases
 LicenseFile={#LicenseFile}
+; Restrict to the arch of the bundled binary (x64compatible covers x64 hosts and
+; x64-on-arm64 emulation; arm64 is native ARM64). 64-bit install mode either way.
+ArchitecturesAllowed={#ArchIdentifier}
+ArchitecturesInstallIn64BitMode={#ArchIdentifier}
 PrivilegesRequired=lowest
 PrivilegesRequiredOverridesAllowed=dialog
 ; Use the "auto" Program Files constant so the destination follows the install

diff --git a/iris-gui/src/main.rs b/iris-gui/src/main.rs
@@ -1423,7 +1423,7 @@ impl App {
                 ui.separator();
                 ui.label(RichText::new("Legal").strong());
                 if ui.button("Licenses…")
-                    .on_hover_text("BSD 3-Clause (IRIS) — plus GPL-3.0 for the CHD backend when built in")
+                    .on_hover_text("BSD 3-Clause (IRIS, and the CHD backend when built in)")
                     .clicked()
                 {
                     self.show_license = true;
@@ -2443,10 +2443,10 @@ impl App {
     /// Paths are relative to this source file (`iris-gui/src/main.rs`).
     fn license_window(&mut self, ctx: &egui::Context) {
         const LICENSE_BSD: &str = include_str!("../../LICENSE");
-        // The CHD backend (libchdman-rs) is GPL-3.0, so any CHD build is conveyed
-        // under GPL-3.0 — mirrors the release pipeline shipping LICENSE-GPL3.txt
-        // alongside LICENSE. Shown only when CHD support is actually built in.
-        const LICENSE_GPL3: &str = include_str!("../../LICENSE-GPL3.txt");
+        // The CHD backend (libchdman-rs >= 0.288.8) is BSD-3-Clause, as is the
+        // MAME CHD core it vendors, so a CHD build stays fully BSD-3-Clause.
+        // Shown only when CHD support is actually built in.
+        const LICENSE_CHD: &str = include_str!("../../LICENSE-libchdman-rs.txt");
         if !self.show_license { return; }
         let chd = iris::build_features::CHD;
         let mut open = true;
@@ -2461,8 +2461,8 @@ impl App {
                 if chd {
                     ui.label(
                         "This build includes CHD disk support via libchdman-rs, which is licensed \
-                         under the GNU GPL-3.0 — so the combined binary is conveyed under GPL-3.0. \
-                         Both licenses apply and are shown below.");
+                         under the BSD 3-Clause License (as is the MAME CHD core it vendors), so \
+                         the whole binary stays BSD 3-Clause. Its notice is shown below.");
                 }
                 ui.add_space(4.0);
                 ui.horizontal(|ui| {
@@ -2481,14 +2481,9 @@ impl App {
                     if chd {
                         ui.add_space(12.0);
                         ui.separator();
-                        ui.label(RichText::new("CHD backend (libchdman-rs) — GNU GPL-3.0").strong());
-                        ui.horizontal(|ui| {
-                            ui.label("Full text also at");
-                            ui.hyperlink_to("gnu.org/licenses/gpl-3.0",
-                                "https://www.gnu.org/licenses/gpl-3.0.html");
-                        });
+                        ui.label(RichText::new("CHD backend (libchdman-rs) — BSD 3-Clause").strong());
                         ui.add_space(2.0);
-                        ui.label(RichText::new(LICENSE_GPL3).monospace());
+                        ui.label(RichText::new(LICENSE_CHD).monospace());
                     }
                 });
             });

diff --git a/src/ci.rs b/src/ci.rs
@@ -129,7 +129,7 @@ pub fn start_server(
         start_tcp_server(server.clone(), &path)?;
     } else {
         #[cfg(unix)]
-        start_unix_server(server, &path)?;
+        start_unix_server(server.clone(), &path)?;
         #[cfg(not(unix))]
         return Err(format!(
             "CI socket path {} requires a Unix domain socket; use host:port on this platform",

diff --git a/src/ultra64.rs b/src/ultra64.rs
@@ -36,6 +36,8 @@ use std::sync::atomic::{AtomicBool, Ordering};
 use std::thread::JoinHandle;
 use shared_memory::ShmemConf;
 use raw_sync::{events::{Event, EventImpl, EventInit, EventState}, Timeout};
+// Only used for the POSIX `shm_unlink` stale-cleanup below (itself `cfg(unix)`).
+// Windows shared memory is OS-refcounted and released when handles close.
 #[cfg(unix)]
 use libc;