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switch chardev to QemuOpts: infrastructure, null device

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start switching chardevs to QemuOpts.  This patch adds the
infrastructure and converts the null device.

The patch brings two new functions:

qemu_chr_open_opts()
	same as qemu_chr_open(), but uses QemuOpts instead of a
	option char string.

qemu_chr_parse_compat()
	accepts a traditional chardev option string, returns the
	corresponding QemuOpts instance, to handle backward
	compatibility.

The patch also adds a new -chardev switch which can be used to create
named+unconnected chardevs, like this:

	-chardev null,id=test

This uses the new qemu_chr_open_opts.  Thus with this patch alone only
the null device works.  The other devices will follow ...

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Gerd Hoffmann 2009-09-10 10:58:35 +02:00 • committed by Anthony Liguori
parent 9d868d4517
commit 191bc01bc9
6 changed files with 93 additions and 4 deletions
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4
qemu-char.h
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@ -3,6 +3,8 @@
#include "qemu-common.h"
#include "sys-queue.h"
#include "qemu-option.h"
#include "qemu-config.h"
/* character device */
@ -68,6 +70,8 @@ struct CharDriverState {
TAILQ_ENTRY(CharDriverState) next;
};
CharDriverState *qemu_chr_open_opts(QemuOpts *opts,
void (*init)(struct CharDriverState *s));
CharDriverState *qemu_chr_open(const char *label, const char *filename, void (*init)(struct CharDriverState *s));
void qemu_chr_close(CharDriverState *chr);
void qemu_chr_printf(CharDriverState *s, const char *fmt, ...);