[Qemu-devel] [PATCH 07/11] chardev: add tty chardev support to chardev-add (qmp)

[Gerd Hoffmann <kraxel@redhat.com>]

Simliar to file, except that no separate in/out files are supported
because it's pointless for direct device access.  Also the special
tty ioctl hooks (pass through linespeed settings etc) are activated.
Both file names and file descriptor passing is supported.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 qapi-schema.json |    6 ++++++
 qemu-char.c      |   53 +++++++++++++++++++++++++++++++++++++++++++++++------
 2 files changed, 53 insertions(+), 6 deletions(-)

diff --git a/qapi-schema.json b/qapi-schema.json
index 8904d36..7e5c8c2 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3036,9 +3036,15 @@
 { 'type': 'ChardevFile', 'data': { '*in' : 'ChardevFileSource',
                                    'out' : 'ChardevFileSource' } }
 
+{ 'enum': 'ChardevPortKind', 'data': [ 'tty' ] }
+
+{ 'type': 'ChardevPort', 'data': { 'device' : 'ChardevFileSource',
+                                   'type'   : 'ChardevPortKind'} }
+
 { 'type': 'ChardevDummy', 'data': { } }
 
 { 'union': 'ChardevBackend', 'data': { 'file' : 'ChardevFile',
+                                       'port' : 'ChardevPort',
                                        'null' : 'ChardevDummy' } }
 
 { 'command': 'chardev-add', 'data': {'id'      : 'str',
diff --git a/qemu-char.c b/qemu-char.c
index 91b0a57..764321b 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -1230,21 +1230,27 @@ static void qemu_chr_close_tty(CharDriverState *chr)
     }
 }
 
+static CharDriverState *qemu_chr_open_tty_fd(int fd)
+{
+    CharDriverState *chr;
+
+    tty_serial_init(fd, 115200, 'N', 8, 1);
+    chr = qemu_chr_open_fd(fd, fd);
+    chr->chr_ioctl = tty_serial_ioctl;
+    chr->chr_close = qemu_chr_close_tty;
+    return chr;
+}
+
 static CharDriverState *qemu_chr_open_tty(QemuOpts *opts)
 {
     const char *filename = qemu_opt_get(opts, "path");
-    CharDriverState *chr;
     int fd;
 
     TFR(fd = qemu_open(filename, O_RDWR | O_NONBLOCK));
     if (fd < 0) {
         return NULL;
     }
-    tty_serial_init(fd, 115200, 'N', 8, 1);
-    chr = qemu_chr_open_fd(fd, fd);
-    chr->chr_ioctl = tty_serial_ioctl;
-    chr->chr_close = qemu_chr_close_tty;
-    return chr;
+    return qemu_chr_open_tty_fd(fd);
 }
 #endif /* __linux__ || __sun__ */
 
@@ -2962,6 +2968,15 @@ static CharDriverState *qmp_chardev_open_file(ChardevFile *file, Error **errp)
     return qemu_chr_open_win_file(out);
 }
 
+static CharDriverState *qmp_chardev_open_port(ChardevPort *port, Error **errp)
+{
+    switch (port->type) {
+    default:
+        error_setg(errp, "unknown chardev port (%d)", port->type);
+        return NULL;
+    }
+}
+
 #else /* WIN32 */
 
 static int qmp_chardev_open_file_source(ChardevFileSource *src, int flags,
@@ -2978,6 +2993,9 @@ static int qmp_chardev_open_file_source(ChardevFileSource *src, int flags,
         break;
     case CHARDEV_FILE_SOURCE_KIND_FD:
         fd = monitor_get_fd(cur_mon, src->fd, errp);
+        if (flags & O_NONBLOCK) {
+            socket_set_nonblock(fd);
+        }
         break;
     default:
         error_setg(errp, "unknown chardev file source (%d)", src->kind);
@@ -3008,6 +3026,26 @@ static CharDriverState *qmp_chardev_open_file(ChardevFile *file, Error **errp)
     return qemu_chr_open_fd(in, out);
 }
 
+static CharDriverState *qmp_chardev_open_port(ChardevPort *port, Error **errp)
+{
+    int flags, fd;
+
+    switch (port->type) {
+#ifdef HAVE_CHARDEV_TTY
+    case CHARDEV_PORT_KIND_TTY:
+        flags = O_RDWR | O_NONBLOCK;
+        fd = qmp_chardev_open_file_source(port->device, flags, errp);
+        if (error_is_set(errp)) {
+            return NULL;
+        }
+        return qemu_chr_open_tty_fd(fd);
+#endif
+    default:
+        error_setg(errp, "unknown chardev port (%d)", port->type);
+        return NULL;
+    }
+}
+
 #endif /* WIN32 */
 
 void qmp_chardev_add(const char *id, ChardevBackend *backend, Error **errp)
@@ -3018,6 +3056,9 @@ void qmp_chardev_add(const char *id, ChardevBackend *backend, Error **errp)
     case CHARDEV_BACKEND_KIND_FILE:
         chr = qmp_chardev_open_file(backend->file, errp);
         break;
+    case CHARDEV_BACKEND_KIND_PORT:
+        chr = qmp_chardev_open_port(backend->port, errp);
+        break;
     case CHARDEV_BACKEND_KIND_NULL:
         chr = qemu_chr_open_null(NULL);
         break;
-- 
1.7.1