char-stdio: Restore blocking mode of stdout on exit

Commit Message

Maxim Mikityanskiy July 3, 2024, 7:08 p.m. UTC

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 <[e-mail]>
---
 chardev/char-stdio.c | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Paolo Bonzini July 3, 2024, 7:54 p.m. UTC | #1

Queued, thanks.

Paolo

Patch

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");