return d->outbuf_size;
}
+/*********************************************************/
+/* Ring buffer chardev */
+
+typedef struct {
+ size_t size;
+ size_t prod;
+ size_t cons;
+ uint8_t *cbuf;
+} RingBufCharDriver;
+
+static size_t ringbuf_count(const CharDriverState *chr)
+{
+ const RingBufCharDriver *d = chr->opaque;
+
+ return d->prod - d->cons;
+}
+
+static int ringbuf_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
+{
+ RingBufCharDriver *d = chr->opaque;
+ int i;
+
+ if (!buf || (len < 0)) {
+ return -1;
+ }
+
+ for (i = 0; i < len; i++ ) {
+ d->cbuf[d->prod++ & (d->size - 1)] = buf[i];
+ if (d->prod - d->cons > d->size) {
+ d->cons = d->prod - d->size;
+ }
+ }
+
+ return 0;
+}
+
+static int ringbuf_chr_read(CharDriverState *chr, uint8_t *buf, int len)
+{
+ RingBufCharDriver *d = chr->opaque;
+ int i;
+
+ for (i = 0; i < len && d->cons != d->prod; i++) {
+ buf[i] = d->cbuf[d->cons++ & (d->size - 1)];
+ }
+
+ return i;
+}
+
+static void ringbuf_chr_close(struct CharDriverState *chr)
+{
+ RingBufCharDriver *d = chr->opaque;
+
+ g_free(d->cbuf);
+ g_free(d);
+ chr->opaque = NULL;
+}
+
+static CharDriverState *qemu_chr_open_ringbuf(QemuOpts *opts)
+{
+ CharDriverState *chr;
+ RingBufCharDriver *d;
+
+ chr = g_malloc0(sizeof(CharDriverState));
+ d = g_malloc(sizeof(*d));
+
+ d->size = qemu_opt_get_size(opts, "size", 0);
+ if (d->size == 0) {
+ d->size = 65536;
+ }
+
+ /* The size must be power of 2 */
+ if (d->size & (d->size - 1)) {
+ error_report("size of ringbuf device must be power of two");
+ goto fail;
+ }
+
+ d->prod = 0;
+ d->cons = 0;
+ d->cbuf = g_malloc0(d->size);
+
+ chr->opaque = d;
+ chr->chr_write = ringbuf_chr_write;
+ chr->chr_close = ringbuf_chr_close;
+
+ return chr;
+
+fail:
+ g_free(d);
+ g_free(chr);
+ return NULL;
+}
+
+static bool chr_is_ringbuf(const CharDriverState *chr)
+{
+ return chr->chr_write == ringbuf_chr_write;
+}
+
+void qmp_ringbuf_write(const char *device, const char *data,
+ bool has_format, enum DataFormat format,
+ Error **errp)
+{
+ CharDriverState *chr;
+ const uint8_t *write_data;
+ int ret;
+ size_t write_count;
+
+ chr = qemu_chr_find(device);
+ if (!chr) {
+ error_setg(errp, "Device '%s' not found", device);
+ return;
+ }
+
+ if (!chr_is_ringbuf(chr)) {
+ error_setg(errp,"%s is not a ringbuf device", device);
+ return;
+ }
+
+ if (has_format && (format == DATA_FORMAT_BASE64)) {
+ write_data = g_base64_decode(data, &write_count);
+ } else {
+ write_data = (uint8_t *)data;
+ write_count = strlen(data);
+ }
+
+ ret = ringbuf_chr_write(chr, write_data, write_count);
+
+ if (write_data != (uint8_t *)data) {
+ g_free((void *)write_data);
+ }
+
+ if (ret < 0) {
+ error_setg(errp, "Failed to write to device %s", device);
+ return;
+ }
+}
+
+char *qmp_ringbuf_read(const char *device, int64_t size,
+ bool has_format, enum DataFormat format,
+ Error **errp)
+{
+ CharDriverState *chr;
+ uint8_t *read_data;
+ size_t count;
+ char *data;
+
+ chr = qemu_chr_find(device);
+ if (!chr) {
+ error_setg(errp, "Device '%s' not found", device);
+ return NULL;
+ }
+
+ if (!chr_is_ringbuf(chr)) {
+ error_setg(errp,"%s is not a ringbuf device", device);
+ return NULL;
+ }
+
+ if (size <= 0) {
+ error_setg(errp, "size must be greater than zero");
+ return NULL;
+ }
+
+ count = ringbuf_count(chr);
+ size = size > count ? count : size;
+ read_data = g_malloc(size + 1);
+
+ ringbuf_chr_read(chr, read_data, size);
+
+ if (has_format && (format == DATA_FORMAT_BASE64)) {
+ data = g_base64_encode(read_data, size);
+ g_free(read_data);
+ } else {
+ /*
+ * FIXME should read only complete, valid UTF-8 characters up
+ * to @size bytes. Invalid sequences should be replaced by a
+ * suitable replacement character. Except when (and only
+ * when) ring buffer lost characters since last read, initial
+ * continuation characters should be dropped.
+ */
+ read_data[size] = 0;
+ data = (char *)read_data;
+ }
+
+ return data;
+}
+
QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename)
{
char host[65], port[33], width[8], height[8];
{ .name = "udp", .open = qemu_chr_open_udp },
{ .name = "msmouse", .open = qemu_chr_open_msmouse },
{ .name = "vc", .open = text_console_init },
+ { .name = "memory", .open = qemu_chr_open_ringbuf },
#ifdef _WIN32
{ .name = "file", .open = qemu_chr_open_win_file_out },
{ .name = "pipe", .open = qemu_chr_open_win_pipe },
},{
.name = "debug",
.type = QEMU_OPT_NUMBER,
+ },{
+ .name = "size",
+ .type = QEMU_OPT_SIZE,
},
{ /* end of list */ }
},
static CharDriverState *qmp_chardev_open_port(ChardevPort *port, Error **errp)
{
- int flags, fd;
-
switch (port->type) {
#ifdef HAVE_CHARDEV_TTY
case CHARDEV_PORT_KIND_SERIAL:
+ {
+ int flags, fd;
flags = O_RDWR;
fd = qmp_chardev_open_file_source(port->device, flags, errp);
if (error_is_set(errp)) {
}
socket_set_nonblock(fd);
return qemu_chr_open_tty_fd(fd);
+ }
#endif
#ifdef HAVE_CHARDEV_PARPORT
case CHARDEV_PORT_KIND_PARALLEL:
+ {
+ int flags, fd;
flags = O_RDWR;
fd = qmp_chardev_open_file_source(port->device, flags, errp);
if (error_is_set(errp)) {
return NULL;
}
return qemu_chr_open_pp_fd(fd);
+ }
#endif
default:
error_setg(errp, "unknown chardev port (%d)", port->type);
case CHARDEV_BACKEND_KIND_SOCKET:
chr = qmp_chardev_open_socket(backend->socket, errp);
break;
+#ifdef HAVE_CHARDEV_TTY
+ case CHARDEV_BACKEND_KIND_PTY:
+ {
+ /* qemu_chr_open_pty sets "path" in opts */
+ QemuOpts *opts;
+ opts = qemu_opts_create_nofail(qemu_find_opts("chardev"));
+ chr = qemu_chr_open_pty(opts);
+ ret->pty = g_strdup(qemu_opt_get(opts, "path"));
+ ret->has_pty = true;
+ qemu_opts_del(opts);
+ break;
+ }
+#endif
case CHARDEV_BACKEND_KIND_NULL:
chr = qemu_chr_open_null(NULL);
break;
projects / qemu.git / blobdiff