static int qemu_chr_write_buffer(Chardev *s,
const uint8_t *buf, int len,
int *offset, bool write_all)
{
ChardevClass *cc = CHARDEV_GET_CLASS(s);
int res = 0;
*offset = 0;
qemu_mutex_lock(&s->chr_write_lock);
while (*offset < len) {
retry:
res = cc->chr_write(s, buf + *offset, len - *offset);
if (res < 0 && errno == EAGAIN && write_all) {
g_usleep(100);
goto retry;
}
if (res <= 0) {
break;
}
*offset += res;
if (!write_all) {
break;
}
}
if (*offset > 0) {
qemu_chr_write_log(s, buf, *offset);
}
qemu_mutex_unlock(&s->chr_write_lock);
return res;
}
static void qemu_char_open(Chardev *chr, ChardevBackend *backend,
bool *be_opened, Error **errp)
{
ChardevClass *cc = CHARDEV_GET_CLASS(chr);
/* Any ChardevCommon member would work */
ChardevCommon *common = backend ? backend->u.null.data : NULL;
if (common && common->has_logfile) {
int flags = O_WRONLY | O_CREAT;
if (common->has_logappend &&
common->logappend) {
flags |= O_APPEND;
} else {
flags |= O_TRUNC;
}
chr->logfd = qemu_open(common->logfile, flags, 0666);
if (chr->logfd < 0) {
error_setg_errno(errp, errno,
"Unable to open logfile %s",
common->logfile);
return;
}
}
if (cc->open) {
cc->open(chr, backend, be_opened, errp);
}
}
int qemu_chr_wait_connected(Chardev *chr, Error **errp)
{
ChardevClass *cc = CHARDEV_GET_CLASS(chr);
if (cc->chr_wait_connected) {
return cc->chr_wait_connected(chr, errp);
}
return 0;
}
static GSource *mux_chr_add_watch(Chardev *s, GIOCondition cond)
{
MuxChardev *d = MUX_CHARDEV(s);
Chardev *chr = qemu_chr_fe_get_driver(&d->chr);
ChardevClass *cc = CHARDEV_GET_CLASS(chr);
if (!cc->chr_add_watch) {
return NULL;
}
return cc->chr_add_watch(chr, cond);
}
int qemu_chr_add_client(Chardev *s, int fd)
{
return CHARDEV_GET_CLASS(s)->chr_add_client ?
CHARDEV_GET_CLASS(s)->chr_add_client(s, fd) : -1;
}