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/* NBD client library in userspace
* Copyright Red Hat
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* struct socket_ops for a plain ordinary Berkeley socket. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "internal.h"
static ssize_t
socket_recv (struct nbd_handle *h, struct socket *sock, void *buf, size_t len)
{
ssize_t r;
r = recv (sock->u.fd, buf, len, 0);
if (r == -1 && errno != EAGAIN && errno != EWOULDBLOCK)
set_error (errno, "recv");
return r;
}
static ssize_t
socket_send (struct nbd_handle *h,
struct socket *sock, const void *buf, size_t len, int flags)
{
ssize_t r;
/* We don't want to die from SIGPIPE, but also don't want to force a
* changed signal handler on the rest of the application.
*/
flags |= MSG_NOSIGNAL;
r = send (sock->u.fd, buf, len, flags);
if (r == -1 && errno != EAGAIN && errno != EWOULDBLOCK)
set_error (errno, "send");
return r;
}
static int
socket_get_fd (struct socket *sock)
{
return sock->u.fd;
}
static bool
socket_shut_writes (struct nbd_handle *h, struct socket *sock)
{
if (shutdown (sock->u.fd, SHUT_WR) == -1)
debug (h, "ignoring shutdown failure: %s", strerror (errno));
/* Regardless of any errors, we don't need to retry. */
return true;
}
static int
socket_close (struct socket *sock)
{
int r = close (sock->u.fd);
free (sock);
return r;
}
static struct socket_ops socket_ops = {
.recv = socket_recv,
.send = socket_send,
.get_fd = socket_get_fd,
.shut_writes = socket_shut_writes,
.close = socket_close,
};
struct socket *
nbd_internal_socket_create (int fd)
{
struct socket *sock;
sock = malloc (sizeof *sock);
if (sock == NULL) {
set_error (errno, "malloc");
return NULL;
}
sock->u.fd = fd;
sock->ops = &socket_ops;
return sock;
}
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