From 6807403eedc83e2c81d6f40a773a9368ed696c05 Mon Sep 17 00:00:00 2001 From: Maxim Mikityanskiy Date: Wed, 3 Jul 2024 22:08:12 +0300 Subject: [PATCH] char-stdio: Restore blocking mode of stdout on exit qemu_chr_open_fd() sets stdout into non-blocking mode. Restore the old fd flags on exit to avoid breaking unsuspecting applications that run on the same terminal after qemu and don't expect to get EAGAIN. While at at, also ensure term_exit is called once (at the moment it's called both from char_stdio_finalize() and as the atexit() hook. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2423 Signed-off-by: Maxim Mikityanskiy Link: https://lore.kernel.org/r/20240703190812.3459514-1-maxtram95@gmail.com Signed-off-by: Paolo Bonzini (cherry picked from commit a0124e333e2176640f233e5ea57a2f413985d9b5) Signed-off-by: Michael Tokarev --- chardev/char-stdio.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/chardev/char-stdio.c b/chardev/char-stdio.c index 3c648678ab..b960ddd4e4 100644 --- a/chardev/char-stdio.c +++ b/chardev/char-stdio.c @@ -41,6 +41,7 @@ /* init terminal so that we can grab keys */ static struct termios oldtty; static int old_fd0_flags; +static int old_fd1_flags; static bool stdio_in_use; static bool stdio_allow_signal; static bool stdio_echo_state; @@ -50,6 +51,8 @@ static void term_exit(void) if (stdio_in_use) { tcsetattr(0, TCSANOW, &oldtty); fcntl(0, F_SETFL, old_fd0_flags); + fcntl(1, F_SETFL, old_fd1_flags); + stdio_in_use = false; } } @@ -102,6 +105,7 @@ static void qemu_chr_open_stdio(Chardev *chr, stdio_in_use = true; old_fd0_flags = fcntl(0, F_GETFL); + old_fd1_flags = fcntl(1, F_GETFL); tcgetattr(0, &oldtty); if (!g_unix_set_fd_nonblocking(0, true, NULL)) { error_setg_errno(errp, errno, "Failed to set FD nonblocking");