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**Issue** Dispatch within tmux can leave `head -1` hanging. **Reproducible test** Linux target. In tmux start vim and `:let b:dispatch=./maker.sh`, write maker.sh as follows: ```sh echo "Press Enter to continue or Ctrl+C to abort ..." read x echo "Making ..." echo "DONE" exit 0 ``` and set maker.sh executable. Then `:Dispatch`, and switch input focus to the compiler's output tmux pane, which shows "Press Enter to continue or...". Here you can either press Enter to simulate a full make or press Ctrl+C to abort. If you press Ctrl+C and check the process list afterwards, you should notice a `head -1 /tmp/xyz.complete` process under the vim parent process. `head -1` is blocked on a fifo that will never receive input because Ctrl+C killed the process that was supposed to write to the fifo. **Proposed fix** This PR unblocks `head -1` through a shell trap handler that writes to the fifo upon receiving the INT signal. If INT is handled, maker.sh exists 129 otherwise the value of `$?`.
tpope
reviewed
Dec 26, 2025
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Issue
Dispatch within tmux can leave
head -1hanging.Reproducible test
Linux target.
In tmux start vim and
:let b:dispatch=./maker.sh, write maker.sh as follows:and set maker.sh executable. Then
:Dispatch, and switch input focus to the compiler's output tmux pane, which shows "Press Enter to continue or...". Here you can either press Enter to simulate a full make or press Ctrl+C to abort. If you press Ctrl+C and check the process list afterwards, you should notice ahead -1 /tmp/xyz.completeprocess under the vim parent process.head -1is blocked on a fifo that will never receive input because Ctrl+C killed the process that was supposed to write to the fifo.Proposed fix
This PR unblocks
head -1through a shell trap handler that writes to the fifo upon receiving the INT signal. If INT is handled, maker.sh exists 129 otherwise the value of$?.