fix: resolve glob handles in POSIX::isatty

dev/design/issue-queue.md

@@ -1,6 +1,6 @@
 # Reviewed issue queues
 
-Snapshot: 2026-10-29, from live open issues, PRs and the #1649 phase contract.
+Snapshot: 2026-10-30, from live open issues, PRs and the #1649 phase contract.
 This is a bounded selection aid, not the complete backlog or fresh runtime
 validation. Follow the [triage and claim protocol](../../docs/guides/issue-triage.md)
 and recheck live issue comments/PRs before starting. Unlisted work is unreviewed
@@ -26,6 +26,7 @@ resolved before implementation. No new pass or failure is asserted here.
 
 | Code/test boundary | Issue | Priority / state | Evidence, next action and blocker |
 |---|---|---|---|
+| POSIX filehandles | [#1932](https://github.com/fglock/PerlOnJava/issues/1932) `POSIX::isatty` glob handling | Normal / Active | IO-Pty-Easy 0.10 passes on system Perl; CPAN run `20261030-095654-34969` failed on both PerlOnJava backends because `*STDIN` reached a direct `RuntimeIO` cast. The helper-based fix and focused test pass on both backends; full `make` passes on `fix/posix-isatty-glob`. A fresh `jcpan -t IO::Pty::Easy` rerun timed out after `t/open-close.t` passed and fork-dependent tests skipped. |
 | File-handle EOF state | [#1922](https://github.com/fglock/PerlOnJava/issues/1922) `IO::Handle::clearerr` | Normal / Active | `Log::Procmail` 0.14 passes on system Perl but failed on both PerlOnJava backends when reading appended data after EOF. The shared runtime fix and permanent regression are in [draft PR #1924](https://github.com/fglock/PerlOnJava/pull/1924); the full make gate and all 281 CPAN tests pass. Await review and CI. |
 | File metadata | [#1912](https://github.com/fglock/PerlOnJava/issues/1912) `Time::HiRes::stat` | Normal / Active | Daiku 1.004 passes on system Perl and exposed the missing runtime function; the implementation and both-backend regression are in [PR #1913](https://github.com/fglock/PerlOnJava/pull/1913). |
 | XML provider APIs | [#1892](https://github.com/fglock/PerlOnJava/issues/1892) XSLT output | High / Active | [PR #1894](https://github.com/fglock/PerlOnJava/pull/1894) is open; verify its serialization fix against HTML::ToDocBook. Coordinate through that work rather than start a duplicate. |

docs/about/changelog.md

@@ -6,6 +6,8 @@ priorities and future plans.
 
 ## Work in progress
 
+- Resolve glob-backed filehandles in `POSIX::isatty` without assuming the glob value is a `RuntimeIO` (#1932).
+
 - Add an initial CryptX Java XS bridge for binary/base64url helpers, functional digests, and HMAC using the existing JCA and Bouncy Castle providers (#1220).
 
 - Preserve named typeglob stringification when copying package stash entries (#1927).

src/main/java/org/perlonjava/runtime/perlmodule/POSIX.java

@@ -577,7 +577,10 @@ public static RuntimeList posix_isatty(RuntimeArray args, int ctx) {
         RuntimeScalar arg = args.get(0);
         // Accept either a fd number or a filehandle (RuntimeIO)
         if (arg.type == RuntimeScalarType.GLOB) {
-            RuntimeIO io = (RuntimeIO) arg.value;
+            RuntimeIO io = arg.getRuntimeIO();
+            if (io == null) {
+                return new RuntimeScalar(0).getList();
+            }
             fd = io.fileno().getInt();
         } else {
             fd = arg.getInt();

src/test/resources/unit/posix_isatty_glob.t

@@ -0,0 +1,11 @@
+use strict;
+use warnings;
+use POSIX ();
+use Test::More;
+
+is(POSIX::isatty(*STDIN) ? 1 : 0, -t STDIN ? 1 : 0,
+    'POSIX::isatty accepts the STDIN glob');
+is(POSIX::isatty(*STDOUT) ? 1 : 0, -t STDOUT ? 1 : 0,
+    'POSIX::isatty accepts the STDOUT glob');
+
+done_testing;