[PATCH v3 01/25] chardev: Simplify IOWatchPoll::fd_can_read as a GSourceFunc

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

IOWatchPoll::fd_can_read() really is a GSourceFunc type, it simply
returns a boolean value.
Update the backends to return a boolean, whether there is data to
read from the source or not.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 chardev/char-fd.c         | 4 ++--
 chardev/char-io.c         | 6 +++---
 chardev/char-pty.c        | 4 ++--
 chardev/char-socket.c     | 6 +++---
 chardev/char-udp.c        | 4 ++--
 include/chardev/char-io.h | 2 +-
 6 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/chardev/char-fd.c b/chardev/char-fd.c
index 2c9b2ce567..2421d8e216 100644
--- a/chardev/char-fd.c
+++ b/chardev/char-fd.c
@@ -69,13 +69,13 @@ static gboolean fd_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
     return TRUE;
 }
 
-static int fd_chr_read_poll(void *opaque)
+static gboolean fd_chr_read_poll(void *opaque)
 {
     Chardev *chr = CHARDEV(opaque);
     FDChardev *s = FD_CHARDEV(opaque);
 
     s->max_size = qemu_chr_be_can_write(chr);
-    return s->max_size;
+    return s->max_size > 0;
 }
 
 static GSource *fd_chr_add_watch(Chardev *chr, GIOCondition cond)
diff --git a/chardev/char-io.c b/chardev/char-io.c
index 8ced184160..2c1c69098e 100644
--- a/chardev/char-io.c
+++ b/chardev/char-io.c
@@ -30,7 +30,7 @@ typedef struct IOWatchPoll {
     QIOChannel *ioc;
     GSource *src;
 
-    IOCanReadHandler *fd_can_read;
+    GSourceFunc fd_can_read;
     GSourceFunc fd_read;
     void *opaque;
 } IOWatchPoll;
@@ -44,7 +44,7 @@ static gboolean io_watch_poll_prepare(GSource *source,
                                       gint *timeout)
 {
     IOWatchPoll *iwp = io_watch_poll_from_source(source);
-    bool now_active = iwp->fd_can_read(iwp->opaque) > 0;
+    bool now_active = iwp->fd_can_read(iwp->opaque);
     bool was_active = iwp->src != NULL;
     if (was_active == now_active) {
         return FALSE;
@@ -76,7 +76,7 @@ static GSourceFuncs io_watch_poll_funcs = {
 
 GSource *io_add_watch_poll(Chardev *chr,
                         QIOChannel *ioc,
-                        IOCanReadHandler *fd_can_read,
+                        GSourceFunc fd_can_read,
                         QIOChannelFunc fd_read,
                         gpointer user_data,
                         GMainContext *context)
diff --git a/chardev/char-pty.c b/chardev/char-pty.c
index b034332edd..7777f6ddef 100644
--- a/chardev/char-pty.c
+++ b/chardev/char-pty.c
@@ -119,13 +119,13 @@ static GSource *pty_chr_add_watch(Chardev *chr, GIOCondition cond)
     return qio_channel_create_watch(s->ioc, cond);
 }
 
-static int pty_chr_read_poll(void *opaque)
+static gboolean pty_chr_read_poll(void *opaque)
 {
     Chardev *chr = CHARDEV(opaque);
     PtyChardev *s = PTY_CHARDEV(opaque);
 
     s->read_bytes = qemu_chr_be_can_write(chr);
-    return s->read_bytes;
+    return s->read_bytes > 0;
 }
 
 static gboolean pty_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
diff --git a/chardev/char-socket.c b/chardev/char-socket.c
index 4fcdd8aedd..262a59b64f 100644
--- a/chardev/char-socket.c
+++ b/chardev/char-socket.c
@@ -147,7 +147,7 @@ static void tcp_chr_accept(QIONetListener *listener,
                            QIOChannelSocket *cioc,
                            void *opaque);
 
-static int tcp_chr_read_poll(void *opaque);
+static gboolean tcp_chr_read_poll(void *opaque);
 static void tcp_chr_disconnect(Chardev *chr);
 
 /* Called with chr_write_lock held.  */
@@ -184,7 +184,7 @@ static int tcp_chr_write(Chardev *chr, const uint8_t *buf, int len)
     }
 }
 
-static int tcp_chr_read_poll(void *opaque)
+static gboolean tcp_chr_read_poll(void *opaque)
 {
     Chardev *chr = CHARDEV(opaque);
     SocketChardev *s = SOCKET_CHARDEV(opaque);
@@ -192,7 +192,7 @@ static int tcp_chr_read_poll(void *opaque)
         return 0;
     }
     s->max_size = qemu_chr_be_can_write(chr);
-    return s->max_size;
+    return s->max_size > 0;
 }
 
 static void tcp_chr_process_IAC_bytes(Chardev *chr,
diff --git a/chardev/char-udp.c b/chardev/char-udp.c
index 097a2f0f42..b6e399e983 100644
--- a/chardev/char-udp.c
+++ b/chardev/char-udp.c
@@ -65,7 +65,7 @@ static void udp_chr_flush_buffer(UdpChardev *s)
     }
 }
 
-static int udp_chr_read_poll(void *opaque)
+static gboolean udp_chr_read_poll(void *opaque)
 {
     Chardev *chr = CHARDEV(opaque);
     UdpChardev *s = UDP_CHARDEV(opaque);
@@ -77,7 +77,7 @@ static int udp_chr_read_poll(void *opaque)
      */
     udp_chr_flush_buffer(s);
 
-    return s->max_size;
+    return s->max_size > 0;
 }
 
 static gboolean udp_chr_read(QIOChannel *chan, GIOCondition cond, void *opaque)
diff --git a/include/chardev/char-io.h b/include/chardev/char-io.h
index 9638da5100..a173874538 100644
--- a/include/chardev/char-io.h
+++ b/include/chardev/char-io.h
@@ -31,7 +31,7 @@
 /* Can only be used for read */
 GSource *io_add_watch_poll(Chardev *chr,
                         QIOChannel *ioc,
-                        IOCanReadHandler *fd_can_read,
+                        GSourceFunc fd_can_read,
                         QIOChannelFunc fd_read,
                         gpointer user_data,
                         GMainContext *context);
-- 
2.20.1


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