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chardev: add qmp hotplug commands, with null chardev support

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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>
This commit is contained in:
Gerd Hoffmann 2012-12-19 10:33:56 +01:00
parent e551498e72
commit f1a1a35638
3 changed files with 152 additions and 0 deletions
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53
qemu-char.c
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@ -3010,3 +3010,56 @@ QemuOptsList qemu_chardev_opts = {
{ /* end of list */ }
},
};
ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
Error **errp)
{
ChardevReturn *ret = g_new0(ChardevReturn, 1);
CharDriverState *chr = NULL;
chr = qemu_chr_find(id);
if (chr) {
error_setg(errp, "Chardev '%s' already exists", id);
g_free(ret);
return NULL;
}
switch (backend->kind) {
case CHARDEV_BACKEND_KIND_NULL:
chr = qemu_chr_open_null(NULL);
break;
default:
error_setg(errp, "unknown chardev backend (%d)", backend->kind);
break;
}
if (chr == NULL && !error_is_set(errp)) {
error_setg(errp, "Failed to create chardev");
}
if (chr) {
chr->label = g_strdup(id);
chr->avail_connections = 1;
QTAILQ_INSERT_TAIL(&chardevs, chr, next);
return ret;
} else {
g_free(ret);
return NULL;
}
}
void qmp_chardev_remove(const char *id, Error **errp)
{
CharDriverState *chr;
chr = qemu_chr_find(id);
if (NULL == chr) {
error_setg(errp, "Chardev '%s' not found", id);
return;
}
if (chr->chr_can_read || chr->chr_read ||
chr->chr_event || chr->handler_opaque) {
error_setg(errp, "Chardev '%s' is busy", id);
return;
}
qemu_chr_delete(chr);
}