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authorromkatv <roman.perepelitsa@gmail.com>2019-09-27 13:28:01 +0200
committerromkatv <roman.perepelitsa@gmail.com>2019-10-04 14:18:18 +0200
commit243e46998eb29665ec345e531b2d1bb6921ed578 (patch)
tree3156f19a5a0bff701d328a67c403839e0f673aae /Functions/Zle/predict-on
parentdca638e3011eb53e7cad054d1886eb65b9e882de (diff)
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bug fix: infinite loop when tty disappears
When TTY disappears and there is at least one fd watcher, raw_getbyte() can
enter an infinite loop where it keeps calling poll() over and over again.

To reproduce, open a terminal, start zsh and type this:

  rm -f /tmp/fifo
  mkfifo /tmp/fifo
  exec 3<>/tmp/fifo
  do-nothing() {}
  zle -F 3 do-nothing

Then make TTY disappear. For example, kill the parent with `kill -9 $PPID`
and close the terminal window if it's still there. Observe that zsh is
consiming 100% CPU. Note that do-nothing() never gets called.

This patch makes the poll() loop in raw_getbyte() terminate when TTY is
signalling POLLHUP. This makes the behavior consistent with the case where
TTY disappears while no fd watchers are installed.
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