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From 4b71b3a9e37d06da2ecc48e06eea7e4a4ae1cfe9 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Thu, 18 May 2017 09:21:20 +0200
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Subject: [PATCH 07/18] serial: poll the serial console with G_IO_HUP
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20170518092131.16571-8-famz@redhat.com>
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Patchwork-id: 75297
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O-Subject: [RHEL-7.4 qemu-kvm PATCH v3 07/18] serial: poll the serial console with G_IO_HUP
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Bugzilla: 1451470
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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From: Roger Pau Monne <roger.pau@citrix.com>
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On FreeBSD polling a master pty while the other end is not connected
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with G_IO_OUT only results in an endless wait. This is different from
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the Linux behaviour, that returns immediately. In order to demonstrate
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this, I have the following example code:
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http://xenbits.xen.org/people/royger/test_poll.c
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When executed on Linux:
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$ ./test_poll
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In callback
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On FreeBSD instead, the callback never gets called:
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$ ./test_poll
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So, in order to workaround this, poll the source with G_IO_HUP (which
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makes the code behave the same way on both Linux and FreeBSD).
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Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
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Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
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Cc: Michael Tokarev <mjt@tls.msk.ru>
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Cc: "Andreas Färber" <afaerber@suse.de>
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Cc: Paolo Bonzini <pbonzini@redhat.com>
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Cc: xen-devel@lists.xenproject.org
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[Add hw/char/cadence_uart.c too. - Paolo]
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit e02bc6de30c44fd668dc0d6e1cd1804f2eed3ed3)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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	hw/char/cadence_uart.c
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Downstream doesn't use qemu_chr_fe_add_watch because we don't have
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38acd64b1c etc.
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	monitor.c
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The changed line is different because we don't have 6cff3e8594 (monitor:
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protect outbuf and mux_out with mutex).
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---
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 hw/char/serial.c         | 2 +-
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 hw/char/virtio-console.c | 3 ++-
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 hw/usb/redirect.c        | 2 +-
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 monitor.c                | 2 +-
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 4 files changed, 5 insertions(+), 4 deletions(-)
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diff --git a/hw/char/serial.c b/hw/char/serial.c
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index e020b0e..add4738 100644
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--- a/hw/char/serial.c
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+++ b/hw/char/serial.c
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@@ -246,7 +246,7 @@ static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque)
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         serial_receive1(s, &s->tsr, 1);
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     } else if (qemu_chr_fe_write(s->chr, &s->tsr, 1) != 1) {
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         if (s->tsr_retry >= 0 && s->tsr_retry < MAX_XMIT_RETRY &&
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-            qemu_chr_fe_add_watch(s->chr, G_IO_OUT, serial_xmit, s) > 0) {
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+            qemu_chr_fe_add_watch(s->chr, G_IO_OUT|G_IO_HUP, serial_xmit, s) > 0) {
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             s->tsr_retry++;
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             return FALSE;
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         }
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diff --git a/hw/char/virtio-console.c b/hw/char/virtio-console.c
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index 1b01dcd..69dd95a 100644
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--- a/hw/char/virtio-console.c
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+++ b/hw/char/virtio-console.c
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@@ -66,7 +66,8 @@ static ssize_t flush_buf(VirtIOSerialPort *port,
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         if (!k->is_console) {
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             virtio_serial_throttle_port(port, true);
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             if (!vcon->watch) {
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-                vcon->watch = qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT,
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+                vcon->watch = qemu_chr_fe_add_watch(vcon->chr,
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+                                                    G_IO_OUT|G_IO_HUP,
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                                                     chr_write_unblocked, vcon);
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             }
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         }
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diff --git a/hw/usb/redirect.c b/hw/usb/redirect.c
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index e3b9f32..3fe2106 100644
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--- a/hw/usb/redirect.c
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+++ b/hw/usb/redirect.c
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@@ -284,7 +284,7 @@ static int usbredir_write(void *priv, uint8_t *data, int count)
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     r = qemu_chr_fe_write(dev->cs, data, count);
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     if (r < count) {
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         if (!dev->watch) {
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-            dev->watch = qemu_chr_fe_add_watch(dev->cs, G_IO_OUT,
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+            dev->watch = qemu_chr_fe_add_watch(dev->cs, G_IO_OUT|G_IO_HUP,
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                                                usbredir_write_unblocked, dev);
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         }
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         if (r < 0) {
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diff --git a/monitor.c b/monitor.c
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index 1b28ff3..393a508 100644
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--- a/monitor.c
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+++ b/monitor.c
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@@ -300,7 +300,7 @@ void monitor_flush(Monitor *mon)
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             mon->outbuf = tmp;
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         }
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         if (mon->watch == 0) {
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-            mon->watch = qemu_chr_fe_add_watch(mon->chr, G_IO_OUT,
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+            mon->watch = qemu_chr_fe_add_watch(mon->chr, G_IO_OUT|G_IO_HUP,
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                                                monitor_unblocked, mon);
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         }
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     }
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-- 
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1.8.3.1
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