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| author | romkatv <roman.perepelitsa@gmail.com> | 2019-09-27 13:28:01 +0200 |
|---|---|---|
| committer | romkatv <roman.perepelitsa@gmail.com> | 2019-10-04 14:18:18 +0200 |
| commit | 243e46998eb29665ec345e531b2d1bb6921ed578 (patch) | |
| tree | 3156f19a5a0bff701d328a67c403839e0f673aae /Src/Zle/zle_main.c | |
| parent | dca638e3011eb53e7cad054d1886eb65b9e882de (diff) | |
| download | zsh-243e46998eb29665ec345e531b2d1bb6921ed578.tar.gz zsh-243e46998eb29665ec345e531b2d1bb6921ed578.zip | |
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.
Diffstat (limited to 'Src/Zle/zle_main.c')
| -rw-r--r-- | Src/Zle/zle_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Src/Zle/zle_main.c b/Src/Zle/zle_main.c index d3b9aeab8..22c12cf1f 100644 --- a/Src/Zle/zle_main.c +++ b/Src/Zle/zle_main.c @@ -708,7 +708,7 @@ raw_getbyte(long do_keytmout, char *cptr, int full) */ if ( # ifdef HAVE_POLL - (fds[0].revents & POLLIN) + (fds[0].revents & (POLLIN|POLLERR|POLLHUP|POLLNVAL)) # else FD_ISSET(SHTTY, &foofd) # endif |