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Add chardev API qemu_chr_fe_read_all 

This function will attempt to read data from the chardev trying
to fill the buffer up to the given length.
Add tcp_chr_disconnect to reuse disconnection code where needed.

Signed-off-by: Antonios Motakis <a.motakis@virtualopensystems.com>
Signed-off-by: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Nikolay Nikolaev 2014-05-27 15:03:48 +03:00 committed by Michael S. Tsirkin
parent 69e03ae64b
commit 7b0bfdf52d
2 changed files with 87 additions and 10 deletions
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14
include/sysemu/char.h
View File

@ -56,6 +56,8 @@ typedef void IOEventHandler(void *opaque, int event);
struct CharDriverState {
void (*init)(struct CharDriverState *s);
int (*chr_write)(struct CharDriverState *s, const uint8_t *buf, int len);
int (*chr_sync_read)(struct CharDriverState *s,
const uint8_t *buf, int len);
GSource *(*chr_add_watch)(struct CharDriverState *s, GIOCondition cond);
void (*chr_update_read_handler)(struct CharDriverState *s);
int (*chr_ioctl)(struct CharDriverState *s, int cmd, void *arg);
@ -188,6 +190,18 @@ int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len);
*/
int qemu_chr_fe_write_all(CharDriverState *s, const uint8_t *buf, int len);
/**
* @qemu_chr_fe_read_all:
*
* Read data to a buffer from the back end.
*
* @buf the data buffer
* @len the number of bytes to read
*
* Returns: the number of bytes read
*/
int qemu_chr_fe_read_all(CharDriverState *s, uint8_t *buf, int len);
/**
* @qemu_chr_fe_ioctl:
*

83
qemu-char.c
View File

@ -84,6 +84,7 @@
#include "ui/qemu-spice.h"
#define READ_BUF_LEN 4096
#define READ_RETRIES 10
/***********************************************************/
/* character device */
@ -145,6 +146,41 @@ int qemu_chr_fe_write_all(CharDriverState *s, const uint8_t *buf, int len)
return offset;
}
int qemu_chr_fe_read_all(CharDriverState *s, uint8_t *buf, int len)
{
int offset = 0, counter = 10;
int res;
if (!s->chr_sync_read) {
return 0;
}
while (offset < len) {
do {
res = s->chr_sync_read(s, buf + offset, len - offset);
if (res == -1 && errno == EAGAIN) {
g_usleep(100);
}
} while (res == -1 && errno == EAGAIN);
if (res == 0) {
break;
}
if (res < 0) {
return res;
}
offset += res;
if (!counter--) {
break;
}
}
return offset;
}
int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg)
{
if (!s->chr_ioctl)
@ -2454,6 +2490,23 @@ static GSource *tcp_chr_add_watch(CharDriverState *chr, GIOCondition cond)
return g_io_create_watch(s->chan, cond);
}
static void tcp_chr_disconnect(CharDriverState *chr)
{
TCPCharDriver *s = chr->opaque;
s->connected = 0;
if (s->listen_chan) {
s->listen_tag = g_io_add_watch(s->listen_chan, G_IO_IN,
tcp_chr_accept, chr);
}
remove_fd_in_watch(chr);
g_io_channel_unref(s->chan);
s->chan = NULL;
closesocket(s->fd);
s->fd = -1;
qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
}
static gboolean tcp_chr_read(GIOChannel *chan, GIOCondition cond, void *opaque)
{
CharDriverState *chr = opaque;
@ -2470,16 +2523,7 @@ static gboolean tcp_chr_read(GIOChannel *chan, GIOCondition cond, void *opaque)
size = tcp_chr_recv(chr, (void *)buf, len);
if (size == 0) {
/* connection closed */
s->connected = 0;
if (s->listen_chan) {
s->listen_tag = g_io_add_watch(s->listen_chan, G_IO_IN, tcp_chr_accept, chr);
}
remove_fd_in_watch(chr);
g_io_channel_unref(s->chan);
s->chan = NULL;
closesocket(s->fd);
s->fd = -1;
qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
tcp_chr_disconnect(chr);
} else if (size > 0) {
if (s->do_telnetopt)
tcp_chr_process_IAC_bytes(chr, s, buf, &size);
@ -2490,6 +2534,24 @@ static gboolean tcp_chr_read(GIOChannel *chan, GIOCondition cond, void *opaque)
return TRUE;
}
static int tcp_chr_sync_read(CharDriverState *chr, const uint8_t *buf, int len)
{
TCPCharDriver *s = chr->opaque;
int size;
if (!s->connected) {
return 0;
}
size = tcp_chr_recv(chr, (void *) buf, len);
if (size == 0) {
/* connection closed */
tcp_chr_disconnect(chr);
}
return size;
}
#ifndef _WIN32
CharDriverState *qemu_chr_open_eventfd(int eventfd)
{
@ -2678,6 +2740,7 @@ static CharDriverState *qemu_chr_open_socket_fd(int fd, bool do_nodelay,
chr->opaque = s;
chr->chr_write = tcp_chr_write;
chr->chr_sync_read = tcp_chr_sync_read;
chr->chr_close = tcp_chr_close;
chr->get_msgfd = tcp_get_msgfd;
chr->chr_add_client = tcp_chr_add_client;