diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2016-01-19 14:13:29 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-02-09 15:45:26 +0100 |
| commit | 34689e206abddac87a5217d458534e24f2a05562 (patch) | |
| tree | 737d508f9eda56012b9d224775ae93ca320fd613 /qemu-char.c | |
| parent | 5b82b703b69acc67b78b98a5efc897a3912719eb (diff) | |
qemu-char: Keep pty slave file descriptor open until the master is closed
If a process opens the slave pts device, writes data to it, then
immediately closes it, the data doesn't reliably get delivered to the
emulated serial port. This seems to be because a read of the master
pty device returns EIO on Linux if no process has the pts device open,
even when data is waiting "in the pipe".
A fix seems to be for QEMU to keep the pts file descriptor open until
the pty is closed, as per the below patch.
Signed-off-by: Ashley Jonathan <jonathan.ashley@altran.com>
Message-Id: <AC19797808C8D548ABDE0CA4A97AA30A30DEB409@XMB-DCFR-37.europe.corp.altran.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'qemu-char.c')
| -rw-r--r-- | qemu-char.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/qemu-char.c b/qemu-char.c index 927c47e503..1fbccf02ac 100644 --- a/qemu-char.c +++ b/qemu-char.c @@ -1171,6 +1171,7 @@ typedef struct { int connected; guint timer_tag; guint open_tag; + int slave_fd; } PtyCharDriver; static void pty_chr_update_read_handler_locked(CharDriverState *chr); @@ -1347,6 +1348,7 @@ static void pty_chr_close(struct CharDriverState *chr) qemu_mutex_lock(&chr->chr_write_lock); pty_chr_state(chr, 0); + close(s->slave_fd); object_unref(OBJECT(s->ioc)); if (s->timer_tag) { g_source_remove(s->timer_tag); @@ -1374,7 +1376,6 @@ static CharDriverState *qemu_chr_open_pty(const char *id, return NULL; } - close(slave_fd); qemu_set_nonblock(master_fd); chr = qemu_chr_alloc(common, errp); @@ -1399,6 +1400,7 @@ static CharDriverState *qemu_chr_open_pty(const char *id, chr->explicit_be_open = true; s->ioc = QIO_CHANNEL(qio_channel_file_new_fd(master_fd)); + s->slave_fd = slave_fd; s->timer_tag = 0; return chr; |