[Qemu-devel] [PATCH 04/20] qemu-char: convert fd_chr to use a GIOChannel

[Amit Shah <amit.shah@redhat.com>]

From: Anthony Liguori <aliguori@us.ibm.com>

This uses the newly introduced IOWatchPoll source.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 qemu-char.c | 103 ++++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 62 insertions(+), 41 deletions(-)

diff --git a/qemu-char.c b/qemu-char.c
index 8aa0b41..4c63ccb 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -541,7 +541,6 @@ int send_all(int fd, const void *_buf, int len1)
 
 #ifndef _WIN32
 
-#if 0
 typedef struct IOWatchPoll
 {
     GSource *src;
@@ -679,60 +678,71 @@ static int io_channel_send_all(GIOChannel *fd, const void *_buf, int len1)
     }
     return len1 - len;
 }
-#endif
 
-typedef struct {
-    int fd_in, fd_out;
+typedef struct FDCharDriver {
+    CharDriverState *chr;
+    GIOChannel *fd_in, *fd_out;
+    guint fd_in_tag;
     int max_size;
+    QTAILQ_ENTRY(FDCharDriver) node;
 } FDCharDriver;
 
-
 static int fd_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
 {
     FDCharDriver *s = chr->opaque;
-    return send_all(s->fd_out, buf, len);
+    
+    return io_channel_send_all(s->fd_out, buf, len);
 }
 
-static int fd_chr_read_poll(void *opaque)
+static gboolean fd_chr_read(GIOChannel *chan, GIOCondition cond, void *opaque)
 {
     CharDriverState *chr = opaque;
     FDCharDriver *s = chr->opaque;
-
-    s->max_size = qemu_chr_be_can_write(chr);
-    return s->max_size;
-}
-
-static void fd_chr_read(void *opaque)
-{
-    CharDriverState *chr = opaque;
-    FDCharDriver *s = chr->opaque;
-    int size, len;
+    int len;
     uint8_t buf[READ_BUF_LEN];
+    GIOStatus status;
+    gsize bytes_read;
 
     len = sizeof(buf);
-    if (len > s->max_size)
+    if (len > s->max_size) {
         len = s->max_size;
-    if (len == 0)
-        return;
-    size = read(s->fd_in, buf, len);
-    if (size == 0) {
-        /* FD has been closed. Remove it from the active list.  */
-        qemu_set_fd_handler2(s->fd_in, NULL, NULL, NULL, NULL);
+    }
+    if (len == 0) {
+        return FALSE;
+    }
+
+    status = g_io_channel_read_chars(chan, (gchar *)buf,
+                                     len, &bytes_read, NULL);
+    if (status == G_IO_STATUS_EOF) {
         qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
-        return;
+        return FALSE;
     }
-    if (size > 0) {
-        qemu_chr_be_write(chr, buf, size);
+    if (status == G_IO_STATUS_NORMAL) {
+        qemu_chr_be_write(chr, buf, bytes_read);
     }
+
+    return TRUE;
+}
+
+static int fd_chr_read_poll(void *opaque)
+{
+    CharDriverState *chr = opaque;
+    FDCharDriver *s = chr->opaque;
+
+    s->max_size = qemu_chr_be_can_write(chr);
+    return s->max_size;
 }
 
 static void fd_chr_update_read_handler(CharDriverState *chr)
 {
     FDCharDriver *s = chr->opaque;
 
-    if (s->fd_in >= 0) {
-        qemu_set_fd_handler2(s->fd_in, fd_chr_read_poll,
-                             fd_chr_read, NULL, chr);
+    if (s->fd_in_tag) {
+        g_source_remove(s->fd_in_tag);
+    }
+
+    if (s->fd_in) {
+        s->fd_in_tag = io_add_watch_poll(s->fd_in, fd_chr_read_poll, fd_chr_read, chr);
     }
 }
 
@@ -740,8 +750,16 @@ static void fd_chr_close(struct CharDriverState *chr)
 {
     FDCharDriver *s = chr->opaque;
 
-    if (s->fd_in >= 0) {
-        qemu_set_fd_handler2(s->fd_in, NULL, NULL, NULL, NULL);
+    if (s->fd_in_tag) {
+        g_source_remove(s->fd_in_tag);
+        s->fd_in_tag = 0;
+    }
+
+    if (s->fd_in) {
+        g_io_channel_unref(s->fd_in);
+    }
+    if (s->fd_out) {
+        g_io_channel_unref(s->fd_out);
     }
 
     g_free(s);
@@ -756,8 +774,9 @@ static CharDriverState *qemu_chr_open_fd(int fd_in, int fd_out)
 
     chr = g_malloc0(sizeof(CharDriverState));
     s = g_malloc0(sizeof(FDCharDriver));
-    s->fd_in = fd_in;
-    s->fd_out = fd_out;
+    s->fd_in = io_channel_from_fd(fd_in);
+    s->fd_out = io_channel_from_fd(fd_out);
+    s->chr = chr;
     chr->opaque = s;
     chr->chr_write = fd_chr_write;
     chr->chr_update_read_handler = fd_chr_update_read_handler;
@@ -1230,22 +1249,24 @@ static int tty_serial_ioctl(CharDriverState *chr, int cmd, void *arg)
     case CHR_IOCTL_SERIAL_SET_PARAMS:
         {
             QEMUSerialSetParams *ssp = arg;
-            tty_serial_init(s->fd_in, ssp->speed, ssp->parity,
+            tty_serial_init(g_io_channel_unix_get_fd(s->fd_in),
+                            ssp->speed, ssp->parity,
                             ssp->data_bits, ssp->stop_bits);
         }
         break;
     case CHR_IOCTL_SERIAL_SET_BREAK:
         {
             int enable = *(int *)arg;
-            if (enable)
-                tcsendbreak(s->fd_in, 1);
+            if (enable) {
+                tcsendbreak(g_io_channel_unix_get_fd(s->fd_in), 1);
+            }
         }
         break;
     case CHR_IOCTL_SERIAL_GET_TIOCM:
         {
             int sarg = 0;
             int *targ = (int *)arg;
-            ioctl(s->fd_in, TIOCMGET, &sarg);
+            ioctl(g_io_channel_unix_get_fd(s->fd_in), TIOCMGET, &sarg);
             *targ = 0;
             if (sarg & TIOCM_CTS)
                 *targ |= CHR_TIOCM_CTS;
@@ -1265,7 +1286,7 @@ static int tty_serial_ioctl(CharDriverState *chr, int cmd, void *arg)
         {
             int sarg = *(int *)arg;
             int targ = 0;
-            ioctl(s->fd_in, TIOCMGET, &targ);
+            ioctl(g_io_channel_unix_get_fd(s->fd_in), TIOCMGET, &targ);
             targ &= ~(CHR_TIOCM_CTS | CHR_TIOCM_CAR | CHR_TIOCM_DSR
                      | CHR_TIOCM_RI | CHR_TIOCM_DTR | CHR_TIOCM_RTS);
             if (sarg & CHR_TIOCM_CTS)
@@ -1280,7 +1301,7 @@ static int tty_serial_ioctl(CharDriverState *chr, int cmd, void *arg)
                 targ |= TIOCM_DTR;
             if (sarg & CHR_TIOCM_RTS)
                 targ |= TIOCM_RTS;
-            ioctl(s->fd_in, TIOCMSET, &targ);
+            ioctl(g_io_channel_unix_get_fd(s->fd_in), TIOCMSET, &targ);
         }
         break;
     default:
@@ -1295,7 +1316,7 @@ static void qemu_chr_close_tty(CharDriverState *chr)
     int fd = -1;
 
     if (s) {
-        fd = s->fd_in;
+        fd = g_io_channel_unix_get_fd(s->fd_in);
     }
 
     fd_chr_close(chr);
-- 
1.8.1.2