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#include "config-host.h"
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#include "trace.h"
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#include "ui/qemu-spice.h"
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#include "sysemu/char.h"
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#include <spice.h>
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#include <spice-experimental.h>
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#include <spice/protocol.h>
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#include "qemu/osdep.h"
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typedef struct SpiceCharDriver {
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    CharDriverState*      chr;
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    SpiceCharDeviceInstance     sin;
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    bool                  active;
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    bool                  blocked;
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    const uint8_t         *datapos;
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    int                   datalen;
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    QLIST_ENTRY(SpiceCharDriver) next;
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} SpiceCharDriver;
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typedef struct SpiceCharSource {
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    GSource               source;
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    SpiceCharDriver       *scd;
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} SpiceCharSource;
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static QLIST_HEAD(, SpiceCharDriver) spice_chars =
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    QLIST_HEAD_INITIALIZER(spice_chars);
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static int vmc_write(SpiceCharDeviceInstance *sin, const uint8_t *buf, int len)
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{
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    SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
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    ssize_t out = 0;
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    ssize_t last_out;
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    uint8_t* p = (uint8_t*)buf;
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    while (len > 0) {
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        int can_write = qemu_chr_be_can_write(scd->chr);
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        last_out = MIN(len, can_write);
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        if (last_out <= 0) {
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            break;
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        }
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        qemu_chr_be_write(scd->chr, p, last_out);
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        out += last_out;
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        len -= last_out;
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        p += last_out;
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    }
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    trace_spice_vmc_write(out, len + out);
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    return out;
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}
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static int vmc_read(SpiceCharDeviceInstance *sin, uint8_t *buf, int len)
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{
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    SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
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    int bytes = MIN(len, scd->datalen);
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    if (bytes > 0) {
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        memcpy(buf, scd->datapos, bytes);
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        scd->datapos += bytes;
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        scd->datalen -= bytes;
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        assert(scd->datalen >= 0);
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    }
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    if (scd->datalen == 0) {
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        scd->datapos = 0;
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        scd->blocked = false;
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    }
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    trace_spice_vmc_read(bytes, len);
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    return bytes;
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}
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#if SPICE_SERVER_VERSION >= 0x000c02
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static void vmc_event(SpiceCharDeviceInstance *sin, uint8_t event)
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{
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    SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
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    int chr_event;
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    switch (event) {
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    case SPICE_PORT_EVENT_BREAK:
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        chr_event = CHR_EVENT_BREAK;
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        break;
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    default:
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        return;
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    }
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    trace_spice_vmc_event(chr_event);
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    qemu_chr_be_event(scd->chr, chr_event);
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}
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#endif
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static void vmc_state(SpiceCharDeviceInstance *sin, int connected)
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{
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    SpiceCharDriver *scd = container_of(sin, SpiceCharDriver, sin);
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    if ((scd->chr->be_open && connected) ||
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        (!scd->chr->be_open && !connected)) {
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        return;
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    }
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    qemu_chr_be_event(scd->chr,
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                      connected ? CHR_EVENT_OPENED : CHR_EVENT_CLOSED);
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}
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static SpiceCharDeviceInterface vmc_interface = {
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    .base.type          = SPICE_INTERFACE_CHAR_DEVICE,
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    .base.description   = "spice virtual channel char device",
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    .base.major_version = SPICE_INTERFACE_CHAR_DEVICE_MAJOR,
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    .base.minor_version = SPICE_INTERFACE_CHAR_DEVICE_MINOR,
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    .state              = vmc_state,
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    .write              = vmc_write,
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    .read               = vmc_read,
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#if SPICE_SERVER_VERSION >= 0x000c02
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    .event              = vmc_event,
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#endif
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};
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static void vmc_register_interface(SpiceCharDriver *scd)
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{
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    if (scd->active) {
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        return;
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    }
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    scd->sin.base.sif = &vmc_interface.base;
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    qemu_spice_add_interface(&scd->sin.base);
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    scd->active = true;
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    trace_spice_vmc_register_interface(scd);
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}
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static void vmc_unregister_interface(SpiceCharDriver *scd)
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{
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    if (!scd->active) {
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        return;
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    }
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    spice_server_remove_interface(&scd->sin.base);
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    scd->active = false;
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    trace_spice_vmc_unregister_interface(scd);
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}
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static gboolean spice_char_source_prepare(GSource *source, gint *timeout)
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{
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    SpiceCharSource *src = (SpiceCharSource *)source;
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    *timeout = -1;
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    return !src->scd->blocked;
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}
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static gboolean spice_char_source_check(GSource *source)
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{
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    SpiceCharSource *src = (SpiceCharSource *)source;
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    return !src->scd->blocked;
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}
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static gboolean spice_char_source_dispatch(GSource *source,
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    GSourceFunc callback, gpointer user_data)
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{
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    GIOFunc func = (GIOFunc)callback;
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    return func(NULL, G_IO_OUT, user_data);
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}
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GSourceFuncs SpiceCharSourceFuncs = {
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    .prepare  = spice_char_source_prepare,
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    .check    = spice_char_source_check,
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    .dispatch = spice_char_source_dispatch,
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};
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static GSource *spice_chr_add_watch(CharDriverState *chr, GIOCondition cond)
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{
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    SpiceCharDriver *scd = chr->opaque;
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    SpiceCharSource *src;
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    assert(cond == G_IO_OUT);
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    src = (SpiceCharSource *)g_source_new(&SpiceCharSourceFuncs,
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                                          sizeof(SpiceCharSource));
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    src->scd = scd;
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    return (GSource *)src;
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}
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static int spice_chr_write(CharDriverState *chr, const uint8_t *buf, int len)
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{
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    SpiceCharDriver *s = chr->opaque;
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    int read_bytes;
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    assert(s->datalen == 0);
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    s->datapos = buf;
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    s->datalen = len;
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    spice_server_char_device_wakeup(&s->sin);
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    read_bytes = len - s->datalen;
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    if (read_bytes != len) {
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        /* We'll get passed in the unconsumed data with the next call */
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        s->datalen = 0;
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        s->datapos = NULL;
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        s->blocked = true;
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    }
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    return read_bytes;
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}
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static void spice_chr_close(struct CharDriverState *chr)
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{
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    SpiceCharDriver *s = chr->opaque;
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    vmc_unregister_interface(s);
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    QLIST_REMOVE(s, next);
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    g_free((char *)s->sin.subtype);
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#if SPICE_SERVER_VERSION >= 0x000c02
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    g_free((char *)s->sin.portname);
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#endif
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    g_free(s);
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}
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static void spice_vmc_set_fe_open(struct CharDriverState *chr, int fe_open)
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{
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    SpiceCharDriver *s = chr->opaque;
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    if (fe_open) {
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        vmc_register_interface(s);
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    } else {
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        vmc_unregister_interface(s);
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    }
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}
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static void spice_port_set_fe_open(struct CharDriverState *chr, int fe_open)
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{
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#if SPICE_SERVER_VERSION >= 0x000c02
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    SpiceCharDriver *s = chr->opaque;
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    if (fe_open) {
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        spice_server_port_event(&s->sin, SPICE_PORT_EVENT_OPENED);
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    } else {
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        spice_server_port_event(&s->sin, SPICE_PORT_EVENT_CLOSED);
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    }
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#endif
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}
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static void spice_chr_fe_event(struct CharDriverState *chr, int event)
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{
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#if SPICE_SERVER_VERSION >= 0x000c02
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    SpiceCharDriver *s = chr->opaque;
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    spice_server_port_event(&s->sin, event);
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#endif
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}
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static void print_allowed_subtypes(void)
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{
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    const char** psubtype;
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    int i;
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    fprintf(stderr, "allowed names: ");
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    for(i=0, psubtype = spice_server_char_device_recognized_subtypes();
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        *psubtype != NULL; ++psubtype, ++i) {
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        if (i == 0) {
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            fprintf(stderr, "%s", *psubtype);
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        } else {
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            fprintf(stderr, ", %s", *psubtype);
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        }
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    }
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    fprintf(stderr, "\n");
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}
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static CharDriverState *chr_open(const char *subtype,
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    void (*set_fe_open)(struct CharDriverState *, int))
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{
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    CharDriverState *chr;
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    SpiceCharDriver *s;
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    chr = g_malloc0(sizeof(CharDriverState));
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    s = g_malloc0(sizeof(SpiceCharDriver));
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    s->chr = chr;
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    s->active = false;
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    s->sin.subtype = g_strdup(subtype);
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    chr->opaque = s;
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    chr->chr_write = spice_chr_write;
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    chr->chr_add_watch = spice_chr_add_watch;
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    chr->chr_close = spice_chr_close;
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    chr->chr_set_fe_open = set_fe_open;
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    chr->explicit_be_open = true;
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    chr->chr_fe_event = spice_chr_fe_event;
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    QLIST_INSERT_HEAD(&spice_chars, s, next);
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    return chr;
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}
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CharDriverState *qemu_chr_open_spice_vmc(const char *type)
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{
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    const char **psubtype = spice_server_char_device_recognized_subtypes();
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    if (type == NULL) {
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        fprintf(stderr, "spice-qemu-char: missing name parameter\n");
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        print_allowed_subtypes();
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        return NULL;
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    }
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    for (; *psubtype != NULL; ++psubtype) {
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        if (strcmp(type, *psubtype) == 0) {
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            break;
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        }
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    }
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    if (*psubtype == NULL) {
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        fprintf(stderr, "spice-qemu-char: unsupported type: %s\n", type);
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        print_allowed_subtypes();
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        return NULL;
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    }
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    return chr_open(type, spice_vmc_set_fe_open);
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}
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#if SPICE_SERVER_VERSION >= 0x000c02
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CharDriverState *qemu_chr_open_spice_port(const char *name)
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{
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    CharDriverState *chr;
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    SpiceCharDriver *s;
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    if (name == NULL) {
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        fprintf(stderr, "spice-qemu-char: missing name parameter\n");
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        return NULL;
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    }
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    chr = chr_open("port", spice_port_set_fe_open);
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    s = chr->opaque;
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    s->sin.portname = g_strdup(name);
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    return chr;
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}
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void qemu_spice_register_ports(void)
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{
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    SpiceCharDriver *s;
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    QLIST_FOREACH(s, &spice_chars, next) {
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        if (s->sin.portname == NULL) {
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            continue;
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        }
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        vmc_register_interface(s);
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    }
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}
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#endif
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static void qemu_chr_parse_spice_vmc(QemuOpts *opts, ChardevBackend *backend,
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                                     Error **errp)
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{
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    const char *name = qemu_opt_get(opts, "name");
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    if (name == NULL) {
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        error_setg(errp, "chardev: spice channel: no name given");
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        return;
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    }
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    backend->spicevmc = g_new0(ChardevSpiceChannel, 1);
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    backend->spicevmc->type = g_strdup(name);
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}
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static void qemu_chr_parse_spice_port(QemuOpts *opts, ChardevBackend *backend,
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                                      Error **errp)
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{
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    const char *name = qemu_opt_get(opts, "name");
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    if (name == NULL) {
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        error_setg(errp, "chardev: spice port: no name given");
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        return;
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    }
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    backend->spiceport = g_new0(ChardevSpicePort, 1);
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    backend->spiceport->fqdn = g_strdup(name);
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}
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static void register_types(void)
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{
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    register_char_driver_qapi("spicevmc", CHARDEV_BACKEND_KIND_SPICEVMC,
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                              qemu_chr_parse_spice_vmc);
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    register_char_driver_qapi("spiceport", CHARDEV_BACKEND_KIND_SPICEPORT,
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                              qemu_chr_parse_spice_port);
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}
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type_init(register_types);