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authorRoger Pau Monne <roger.pau@citrix.com>2014-05-23 17:57:49 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2014-06-30 15:04:34 +0200
commite02bc6de30c44fd668dc0d6e1cd1804f2eed3ed3 (patch)
tree248484486b6a64e6c79a4560bec751d6130ec505 /hw
parent9328cfd2fe4a7ff86a41b2c26ea33974241d7d4e (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')
-rw-r--r--hw/char/cadence_uart.c3
-rw-r--r--hw/char/serial.c2
-rw-r--r--hw/char/virtio-console.c3
-rw-r--r--hw/usb/redirect.c2
4 files changed, 6 insertions, 4 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);
}
}
diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
index 4c6187bebd..44522d9005 100644
--- a/hw/usb/redirect.c
+++ b/hw/usb/redirect.c
@@ -290,7 +290,7 @@ static int usbredir_write(void *priv, uint8_t *data, int count)
r = qemu_chr_fe_write(dev->cs, data, count);
if (r < count) {
if (!dev->watch) {
- dev->watch = qemu_chr_fe_add_watch(dev->cs, G_IO_OUT,
+ dev->watch = qemu_chr_fe_add_watch(dev->cs, G_IO_OUT|G_IO_HUP,
usbredir_write_unblocked, dev);
}
if (r < 0) {