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chardev: comment details for CLOSED event

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It was unclear before on what does the CLOSED event mean.  Meanwhile we
add a TODO to fix up the CLOSED event in the future when the in/out
ports are different for a chardev.

CC: Paolo Bonzini <pbonzini@redhat.com>
CC: "Marc-André Lureau" <marcandre.lureau@redhat.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180620073223.31964-2-peterx@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
This commit is contained in:
Peter Xu 2018-06-20 15:32:17 +08:00 committed by Markus Armbruster
parent 6f4fa0998f
commit d88610111b
1 changed files with 10 additions and 1 deletions
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11
include/chardev/char.h
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@ -22,7 +22,16 @@ typedef enum {
CHR_EVENT_OPENED, /* new connection established */
CHR_EVENT_MUX_IN, /* mux-focus was set to this terminal */
CHR_EVENT_MUX_OUT, /* mux-focus will move on */
CHR_EVENT_CLOSED /* connection closed */
CHR_EVENT_CLOSED /* connection closed. NOTE: currently this event
* is only bound to the read port of the chardev.
* Normally the read port and write port of a
* chardev should be the same, but it can be
* different, e.g., for fd chardevs, when the two
* fds are different. So when we received the
* CLOSED event it's still possible that the out
* port is still open. TODO: we should only send
* the CLOSED event when both ports are closed.
*/
} QEMUChrEvent;
#define CHR_READ_BUF_LEN 4096