chardev: add error reporting for qemu_chr_new_from_opts

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
chardev: fix QemuOpts lifecycle

qemu_chr_new_from_opts handles QemuOpts release now, so callers don't
have to worry.  It will either be saved in CharDriverState, then
released in qemu_chr_delete, or in the error case released instantly.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
chardev: reduce chardev ifdef mess a bit

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
chardev: add qmp hotplug commands, with null chardev support

Add chardev-add and chardev-remove qmp commands.  Hotplugging
a null chardev is supported for now, more will be added later.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
chardev: add hmp hotplug commands

Add chardev-add and chardev-remove commands to the human monitor.
chardev-add accepts the same syntax as -chardev, chardev-remove
expects a chardev id.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
chardev: add file chardev support to chardev-add (qmp)

Add support for file chardevs.  Output file is mandatory,
input file is optional.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
chardev: add serial chardev support to chardev-add (qmp)

Similar 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
on Unix.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
chardev: add parallel chardev support to chardev-add (qmp)

Also alias the old parport name to parallel for -chardev.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
chardev: add socket chardev support to chardev-add (qmp)

qemu_chr_open_socket is split into two functions.  All initialization
after creating the socket file handler is split away into the new
qemu_chr_open_socket_fd function.

chr->filename doesn't get filled from QemuOpts any more.  Qemu gathers
the information using getsockname and getnameinfo instead.  This way it
will also work correctly for file handles passed via file descriptor
passing.

Finally qmp_chardev_open_socket() is the actual qmp hotplug
implementation which basically just calls socket_listen or
socket_connect and the new qemu_chr_open_socket_fd function.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
chardev: add pty chardev support to chardev-add (qmp)

The ptsname is returned directly, so there is no need to
use query-chardev to figure the pty device path.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Merge remote-tracking branch 'kraxel/chardev.1' into staging

# By Gerd Hoffmann
# Via Gerd Hoffmann
* kraxel/chardev.1:
  chardev: add pty chardev support to chardev-add (qmp)
  chardev: add socket chardev support to chardev-add (qmp)
  chardev: add parallel chardev support to chardev-add (qmp)
  chardev: add serial chardev support to chardev-add (qmp)
  chardev: add file chardev support to chardev-add (qmp)
  chardev: add hmp hotplug commands
  chardev: add qmp hotplug commands, with null chardev support
  chardev: reduce chardev ifdef mess a bit
  chardev: fix QemuOpts lifecycle
  chardev: add error reporting for qemu_chr_new_from_opts