int write(int fd, const void *buf, size_t nbytes)
{
if (fd < 0 || fd >= NOFILE) {
fd = EBADF;
return -1;
}
switch (files[fd].type) {
case FTYPE_SAVEFILE: {
int ret = 0, tot = nbytes;
while (nbytes > 0) {
ret = xencons_ring_send(files[fd].cons.dev, (char *)buf, nbytes);
nbytes -= ret;
buf = (char *)buf + ret;
}
return tot - nbytes;
}
case FTYPE_CONSOLE:
console_print(files[fd].cons.dev, (char *)buf, nbytes);
return nbytes;
#ifdef HAVE_LWIP
case FTYPE_SOCKET:
return lwip_write(files[fd].socket.fd, (void*) buf, nbytes);
#endif
case FTYPE_TAP:
netfront_xmit(files[fd].tap.dev, (void*) buf, nbytes);
return nbytes;
default:
break;
}
printk("write(%d): Bad descriptor\n", fd);
errno = EBADF;
return -1;
}
static void __xencons_tx_flush(void)
{
int sent, sz, work_done = 0;
if (x_char) {
if (is_initial_xendomain())
kcons_write_dom0(NULL, &x_char, 1);
else
while (x_char)
if (xencons_ring_send(&x_char, 1) == 1)
break;
x_char = 0;
work_done = 1;
}
while (wc != wp) {
sz = wp - wc;
if (sz > (wbuf_size - WBUF_MASK(wc)))
sz = wbuf_size - WBUF_MASK(wc);
if (is_initial_xendomain()) {
kcons_write_dom0(NULL, &wbuf[WBUF_MASK(wc)], sz);
wc += sz;
} else {
sent = xencons_ring_send(&wbuf[WBUF_MASK(wc)], sz);
if (sent == 0)
break;
wc += sent;
}
work_done = 1;
}
if (work_done && (xencons_tty != NULL)) {
wake_up_interruptible(&xencons_tty->write_wait);
if ((xencons_tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
(xencons_tty->ldisc.write_wakeup != NULL))
(xencons_tty->ldisc.write_wakeup)(xencons_tty);
}
}
/*** Forcibly flush console data before dying. ***/
void
xcons_force_flush(void)
{
int sz;
if (xen_initial_domain())
return;
/* Spin until console data is flushed through to the domain controller. */
while (wc != wp) {
int sent = 0;
if ((sz = wp - wc) == 0)
continue;
sent = xencons_ring_send(&wbuf[WBUF_MASK(wc)], sz);
if (sent > 0)
wc += sent;
}
}
int write(int fd, const void *buf, size_t nbytes)
{
switch (files[fd].type) {
case FTYPE_SAVEFILE: {
int ret = 0, tot = nbytes;
while (nbytes > 0) {
ret = xencons_ring_send(files[fd].cons.dev, (char *)buf, nbytes);
nbytes -= ret;
buf = (char *)buf + ret;
}
return tot - nbytes;
}
case FTYPE_CONSOLE:
console_print(files[fd].cons.dev, (char *)buf, nbytes);
return nbytes;
#ifdef HAVE_LWIP
case FTYPE_SOCKET:
return lwip_write(files[fd].socket.fd, (void*) buf, nbytes);
#endif
#ifdef CONFIG_NETFRONT
case FTYPE_TAP:
netfront_xmit(files[fd].tap.dev, (void*) buf, nbytes);
return nbytes;
#endif
#ifdef CONFIG_BLKFRONT
case FTYPE_BLK:
return blkfront_posix_write(fd, buf, nbytes);
#endif
#ifdef CONFIG_TPMFRONT
case FTYPE_TPMFRONT:
return tpmfront_posix_write(fd, buf, nbytes);
#endif
#ifdef CONFIG_TPM_TIS
case FTYPE_TPM_TIS:
return tpm_tis_posix_write(fd, buf, nbytes);
#endif
default:
break;
}
printk("write(%d): Bad descriptor\n", fd);
errno = EBADF;
return -1;
}
/*** Forcibly flush console data before dying. ***/
void xencons_force_flush(void)
{
int sz;
/* Emergency console is synchronous, so there's nothing to flush. */
if (!is_running_on_xen() ||
is_initial_xendomain() ||
!xen_start_info->console.domU.evtchn)
return;
/* Spin until console data is flushed through to the daemon. */
while (wc != wp) {
int sent = 0;
if ((sz = wp - wc) == 0)
continue;
sent = xencons_ring_send(&wbuf[WBUF_MASK(wc)], sz);
if (sent > 0)
wc += sent;
}
}
static void
__xencons_tx_flush(void)
{
int sz;
CN_LOCK(cn_mtx);
while (wc != wp) {
int sent;
sz = wp - wc;
if (sz > (WBUF_SIZE - WBUF_MASK(wc)))
sz = WBUF_SIZE - WBUF_MASK(wc);
if (xen_initial_domain()) {
HYPERVISOR_console_io(CONSOLEIO_write, sz, &wbuf[WBUF_MASK(wc)]);
wc += sz;
} else {
sent = xencons_ring_send(&wbuf[WBUF_MASK(wc)], sz);
if (sent == 0)
break;
wc += sent;
}
}
CN_UNLOCK(cn_mtx);
}
