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[Qemu-devel] [PATCH] chardev: don't splatter terminal settings on exit i
From: |
Daniel P . Berrangé |
Subject: |
[Qemu-devel] [PATCH] chardev: don't splatter terminal settings on exit if not previously set |
Date: |
Mon, 4 Jun 2018 13:30:43 +0100 |
The stdio chardev finalize method calls term_exit() to restore the
original terminal settings that were saved in the "oldtty" global. If
the qemu_chr_open_stdio() method exited with an error, we might not have
any original terminal settings saved in "oldtty" yet.
eg
$ qemu-system-x86_64 -monitor stdio -daemonize
qemu-system-x86_64: -monitor stdio: cannot use stdio with -daemonize
will cause QEMU to splatter the terminal settings with an all-zeros
"struct termios", with predictably unpleasant results. Fortunately the
existing "stdio_in_use" flag is suitable witness for whether "oldtty"
contains settings that need restoring.
Signed-off-by: Daniel P. Berrangé <address@hidden>
---
chardev/char-stdio.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/chardev/char-stdio.c b/chardev/char-stdio.c
index d83e60e787..8039e85f64 100644
--- a/chardev/char-stdio.c
+++ b/chardev/char-stdio.c
@@ -46,8 +46,10 @@ static bool stdio_echo_state;
static void term_exit(void)
{
- tcsetattr(0, TCSANOW, &oldtty);
- fcntl(0, F_SETFL, old_fd0_flags);
+ if (stdio_in_use) {
+ tcsetattr(0, TCSANOW, &oldtty);
+ fcntl(0, F_SETFL, old_fd0_flags);
+ }
}
static void qemu_chr_set_echo_stdio(Chardev *chr, bool echo)
--
2.17.0
- [Qemu-devel] [PATCH] chardev: don't splatter terminal settings on exit if not previously set,
Daniel P . Berrangé <=