1 files changed, 19 insertions, 5 deletions

diff --git a/src/ninep/tree.zig b/src/ninep/tree.zig
index be03e8f0..c71a706f 100644
--- a/src/ninep/tree.zig
+++ b/src/ninep/tree.zig
@@ -646,7 +646,9 @@ fn topSize(p: *Pardes, f: TopFile) u64 {
         .README => fs.help.len,
         .status => ctl.statusLen(p),
         .look, .exec, .tagexec => ctl.resultsLen(p),
-        .log => events.logLen(&p.fs.log),
+        // A stream: a length would read as its end to a kernel that caches
+        // one (a 9ns mount's splice), and a follower's reads go past it.
+        .log => 0,
         .ctl => ctl.rootLen(p),
         .commands => ctl.commandsLen(),
         .focus => focus: {
@@ -1092,10 +1094,14 @@ fn readFile(p: *Pardes, req: Req, target: Target) Reply {
             // A run's answer outlives the pane it ran in.
             if (t.file == .pty_run and req.handle != 0) return pty.readRun(p, req);
             const id = p.paneBySerial(t.serial) orelse {
-                // An event or pty/data read the pane closed under: acme's
-                // answer to the same (editors/acme/xfid.c:1005).
-                if (openOf(p, req)) |o| if (o.what == .event or o.what == .pty_data)
-                    return failText(req.tag, E.NOENT, e_shut_down);
+                // An event reader whose pane closed reads its end: there
+                // are no more records, as a pipe's writer gone is EOF, so
+                // `while read` and `cat` end cleanly. A pty/data read the
+                // pane closed under keeps acme's answer (xfid.c:1005).
+                if (openOf(p, req)) |o| {
+                    if (o.what == .event) return .{ .tag = req.tag };
+                    if (o.what == .pty_data) return failText(req.tag, E.NOENT, e_shut_down);
+                }
                 return Reply.fail(req.tag, E.NOENT);
             };
             const pn = p.panes[id].?;
@@ -1335,6 +1341,14 @@ test "filesystem inspection preserves pending and displayed Look hover" {
     try testing.expect(!p.raw_hover_intent);
 }
 
+test "log stats 0 however much it holds, a stream as acme's generated files are" {
+    const p = try th.withFile(testing.allocator, "x\n");
+    defer p.deinit();
+    _ = th.wr(p, Node.of(th.serialOf(p), .exec), "Msg a record for the log\n");
+    try testing.expect(th.logHas(p, "a record for the log"));
+    try testing.expectEqual(@as(u64, 0), call(p, .{ .tag = 1, .op = .getattr, .node = @intFromEnum(TopFile.log) }).reply.attr.size);
+}
+
 test "filesystem pane creation and truncation cancel Look hover" {
     const requests = [_]Req{
         // Opening `new` is what makes a pane now; walking to it makes none,