Edit's w to a file changed on disk since read is refused once, as Save is (w again to overwrite), the rest of an X/'/w written and the refused named; Edit filters get a pane command's environment ($PARDES_MOUNT, $PARDES_9P, $PARDES_PID, $winid); an Edit with no commands runs beside one whose commands run unless it touches a file that one changes, refused busy (EBUSY) as is a second Edit with commands

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 8ece7ead..917c9c39 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -318,6 +318,9 @@ pub fn captured(p: *Pardes, req: Req, id: usize, exec: bool, text: []const u8, i
 /// there (`no such`, `not found`, the words 9ns reads as ENOENT too), else
 /// EIO.
 pub fn failureErrno(failure: []const u8) u16 {
+    // Refused while something else runs (an Edit's commands): EBUSY, the
+    // word 9ns reads as it.
+    if (std.mem.indexOf(u8, failure, "busy: ") != null) return E.BUSY;
     if (std.mem.indexOf(u8, failure, "no such") != null or std.mem.indexOf(u8, failure, "not found") != null) return E.NOENT;
     // A pattern refused (Edit's too) is malformed input, as 9ns reads it;
     // so is a word this build has not (`invalid: acme's Put ...`).