diff options
| author | Roger Pau Monne <roger.pau@citrix.com> | 2014-05-23 17:57:49 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-06-30 15:04:34 +0200 |
| commit | e02bc6de30c44fd668dc0d6e1cd1804f2eed3ed3 (patch) | |
| tree | 248484486b6a64e6c79a4560bec751d6130ec505 /hw/char | |
| parent | 9328cfd2fe4a7ff86a41b2c26ea33974241d7d4e (diff) | |
serial: poll the serial console with G_IO_HUP
On FreeBSD polling a master pty while the other end is not connected
with G_IO_OUT only results in an endless wait. This is different from
the Linux behaviour, that returns immediately. In order to demonstrate
this, I have the following example code:
http://xenbits.xen.org/people/royger/test_poll.c
When executed on Linux:
$ ./test_poll
In callback
On FreeBSD instead, the callback never gets called:
$ ./test_poll
So, in order to workaround this, poll the source with G_IO_HUP (which
makes the code behave the same way on both Linux and FreeBSD).
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Cc: Michael Tokarev <mjt@tls.msk.ru>
Cc: "Andreas Färber" <afaerber@suse.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: xen-devel@lists.xenproject.org
[Add hw/char/cadence_uart.c too. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/char')
| -rw-r--r-- | hw/char/cadence_uart.c | 3 | ||||
| -rw-r--r-- | hw/char/serial.c | 2 | ||||
| -rw-r--r-- | hw/char/virtio-console.c | 3 |
3 files changed, 5 insertions, 3 deletions
diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c index bf0c853499..dbbc167425 100644 --- a/hw/char/cadence_uart.c +++ b/hw/char/cadence_uart.c @@ -306,7 +306,8 @@ static gboolean cadence_uart_xmit(GIOChannel *chan, GIOCondition cond, memmove(s->tx_fifo, s->tx_fifo + ret, s->tx_count); if (s->tx_count) { - int r = qemu_chr_fe_add_watch(s->chr, G_IO_OUT, cadence_uart_xmit, s); + int r = qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP, + cadence_uart_xmit, s); assert(r); } diff --git a/hw/char/serial.c b/hw/char/serial.c index d17da1654c..54180a9cba 100644 --- a/hw/char/serial.c +++ b/hw/char/serial.c @@ -246,7 +246,7 @@ static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque) serial_receive1(s, &s->tsr, 1); } else if (qemu_chr_fe_write(s->chr, &s->tsr, 1) != 1) { if (s->tsr_retry >= 0 && s->tsr_retry < MAX_XMIT_RETRY && - qemu_chr_fe_add_watch(s->chr, G_IO_OUT, serial_xmit, s) > 0) { + qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP, serial_xmit, s) > 0) { s->tsr_retry++; return FALSE; } diff --git a/hw/char/virtio-console.c b/hw/char/virtio-console.c index 54eb15f3af..752ed2c3c8 100644 --- a/hw/char/virtio-console.c +++ b/hw/char/virtio-console.c @@ -70,7 +70,8 @@ static ssize_t flush_buf(VirtIOSerialPort *port, if (!k->is_console) { virtio_serial_throttle_port(port, true); if (!vcon->watch) { - vcon->watch = qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, + vcon->watch = qemu_chr_fe_add_watch(vcon->chr, + G_IO_OUT|G_IO_HUP, chr_write_unblocked, vcon); } } |