Commit f33395ce6a

@@ -269,6 +269,19 @@ pub const Node = struct {
         storageByIndex(index).setIpcFd(fd);
     }
 
+    /// Posix-only. Thread-safe. Assumes the node is storing an IPC file
+    /// descriptor.
+    pub fn getIpcFd(node: Node) ?posix.fd_t {
+        const index = node.index.unwrap() orelse return null;
+        const storage = storageByIndex(index);
+        const int = @atomicLoad(u32, &storage.completed_count, .monotonic);
+        return switch (@typeInfo(posix.fd_t)) {
+            .Int => @bitCast(int),
+            .Pointer => @ptrFromInt(int),
+            else => @compileError("unsupported fd_t of " ++ @typeName(posix.fd_t)),
+        };
+    }
+
     fn storageByIndex(index: Node.Index) *Node.Storage {
         return &global_progress.node_storage[@intFromEnum(index)];
     }
@@ -329,6 +342,11 @@ var default_draw_buffer: [4096]u8 = undefined;
 
 var debug_start_trace = std.debug.Trace.init;
 
+pub const have_ipc = switch (builtin.os.tag) {
+    .wasi, .freestanding, .windows => false,
+    else => true,
+};
+
 const noop_impl = builtin.single_threaded or switch (builtin.os.tag) {
     .wasi, .freestanding => true,
     else => false,